Articles de revues : « N2 capture and conversion »

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Mezza, Alessio, Angelo Pettigiani, Nicolò B. D. Monti, Sergio Bocchini, M. Amin Farkhondehfal, Juqin Zeng, Angelica Chiodoni, Candido F. Pirri et Adriano Sacco. « An Electrochemical Platform for the Carbon Dioxide Capture and Conversion to Syngas ». Energies 14, n^o 23 (24 novembre 2021) : 7869. http://dx.doi.org/10.3390/en14237869.

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We report on a simple electrochemical system able to capture gaseous carbon dioxide from a gas mixture and convert it into syngas. The capture/release module is implemented via regeneration of NaOH and acidification of NaHCO3 inside a four-chamber electrochemical flow cell employing Pt foils as catalysts, while the conversion is carried out by a coupled reactor that performs electrochemical reduction of carbon dioxide using ZnO as a catalyst and KHCO3 as an electrolyte. The capture module is optimized such that, powered by a current density of 100 mA/cm2, from a mixture of the CO2–N2 gas stream, a pure and stable CO2 outlet flow of 4–5 mL/min is obtained. The conversion module is able to convert the carbon dioxide into a mixture of gaseous CO and H2 (syngas) with a selectivity for the carbon monoxide of 56%. This represents the first all-electrochemical system for carbon dioxide capture and conversion.

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Mekbuntoon, Pongsakorn, Sirima Kongpet, Walailak Kaeochana, Pawonpart Luechar, Prasit Thongbai, Artit Chingsungnoen, Kodchaporn Chinnarat, Suninad Kaewnisai et Viyada Harnchana. « The Modification of Activated Carbon for the Performance Enhancement of a Natural-Rubber-Based Triboelectric Nanogenerator ». Polymers 15, n^o 23 (28 novembre 2023) : 4562. http://dx.doi.org/10.3390/polym15234562.

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Increasing energy demands and growing environmental concerns regarding the consumption of fossil fuels are important motivations for the development of clean and sustainable energy sources. A triboelectric nanogenerator (TENG) is a promising energy technology that harnesses mechanical energy from the ambient environment by converting it into electrical energy. In this work, the enhancement of the energy conversion performance of a natural rubber (NR)-based TENG has been proposed by using modified activated carbon (AC). The effect of surface modification techniques, including acid treatments and plasma treatment for AC material on TENG performance, are investigated. The TENG fabricated from the NR incorporated with the modified AC using N2 plasma showed superior electrical output performance, which was attributed to the modification by N2 plasma introducing changes in the surface chemistry of AC, leading to the improved dielectric property of the NR-AC composite, which contributes to the enhanced triboelectric charge density. The highest power density of 2.65 mW/m2 was obtained from the NR-AC (N2 plasma-treated) TENG. This research provides a key insight into the modification of AC for the development of TENG with high energy conversion performance that could be useful for other future applications such as PM2.5 removal or CO2 capture.

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Gong, Dehong, Zhongxiao Zhang et Ting Zhao. « Decay on Cyclic CO2 Capture Performance of Calcium-Based Sorbents Derived from Wasted Precursors in Multicycles ». Energies 15, n^o 9 (3 mai 2022) : 3335. http://dx.doi.org/10.3390/en15093335.

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In order to obtain the cheap waste calcium-based sorbent, three wasted CaCO3 precursors, namely carbide slag, chicken eggshells, and analytical reagent-grade calcium carbonate, were selected and prepared at 700 °C to form calcium-based sorbents for CO2 capture. TGA was used to test the CO2 uptake performance of each calcium-based sorbent in 20 cycles. To identify the decay mechanism of CO2 uptake with an increasing number of cycles, all calcium-based sorbents were characterized by using XRF, XRD, and N2 adsorption. The specific surface area of calcium-based sorbents was used to redefine the formula of cyclic carbonation reactivity decay. The carbonation conversion rate of three calcium-based sorbents exhibited a decreasing trend as the cycle number increased. Chicken eggshells exhibited the most significant decrease rate (over 50% compared with Cycle 1), while carbide slag and analytical reagent-grade calcium carbonate showed a flat linear decline trend. The specific surface area of the samples was used to calculate carbonation conversion for an infinite number of cycles. The carbonation conversion rates of three calcium-based sorbents were estimated to decrease to 0.2898, 0.1455, and 0.3438 mol/mol, respectively, after 100 cycles.

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Donskoy, I. G. « Thermodynamic modeling of solid fuel gasification in mixtures of oxygen and carbon dioxide ». Journal of Physics : Conference Series 2119, n^o 1 (1 décembre 2021) : 012101. http://dx.doi.org/10.1088/1742-6596/2119/1/012101.

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Abstract One of the main problems in the use of solid fuels is inevitable formation of significant amounts of carbon dioxide. The prospects for reducing CO2 emissions (carbon capture and storage, CCS) are opening up with the use of new coal technologies, such as thermal power plants with integrated gasification (IGCC) and transition to oxygen-enriched combustion (oxyfuel). In order to study the efficiency of solid fuel conversion processes using carbon dioxide, thermodynamic modeling was carried out. Results show that difference between efficiency of fuel conversion in O2/N2 and O2/CO2 mixtures increases with an increase in the volatile content and a decrease in the carbon content. The effect of using CO2 as a gasification agent depends on the oxygen concentration: at low oxygen concentrations, the process temperature turns out to be low due to dilution; at high oxygen concentrations, the CO2 concentration is not high enough for efficient carbon conversion.

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Piccirilli, Luca, Danielle Lobo Justo Pinheiro et Martin Nielsen. « Recent Progress with Pincer Transition Metal Catalysts for Sustainability ». Catalysts 10, n^o 7 (11 juillet 2020) : 773. http://dx.doi.org/10.3390/catal10070773.

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Our planet urgently needs sustainable solutions to alleviate the anthropogenic global warming and climate change. Homogeneous catalysis has the potential to play a fundamental role in this process, providing novel, efficient, and at the same time eco-friendly routes for both chemicals and energy production. In particular, pincer-type ligation shows promising properties in terms of long-term stability and selectivity, as well as allowing for mild reaction conditions and low catalyst loading. Indeed, pincer complexes have been applied to a plethora of sustainable chemical processes, such as hydrogen release, CO2 capture and conversion, N2 fixation, and biomass valorization for the synthesis of high-value chemicals and fuels. In this work, we show the main advances of the last five years in the use of pincer transition metal complexes in key catalytic processes aiming for a more sustainable chemical and energy production.

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Wang, Lei, Wu Qin, Ling Nan Wu, Xue Qing Hu, Ming Zhong Gao, Jun Jiao Zhang, Chang Qing Dong et Yong Ping Yang. « Experimental Study on Coal Chemical Looping Combustion Using CuFe₂O₄ as Oxygen Carrier ». Advanced Materials Research 805-806 (septembre 2013) : 1387–90. http://dx.doi.org/10.4028/www.scientific.net/amr.805-806.1387.

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Chemical-looping combustion (CLC) has been proposed as an efficient and clean technology that could contribute to achieve carbon dioxide capture with negligible cost. The technology uses a metal oxide as oxygen carrier that indirectly transfer oxygen from air to fuels to oxidize the fuels. CuFe2O4 was prepared as a novel oxygen carrier to decrease the cost of raw material and increase the reactivity of iron-based oxygen carrier. The structure of the prepared oxygen carrier was characterized by scanning electron microscope (SEM) and an X-ray diffractometer (XRD). The reaction of CuFe2O4 with coal was tested in a thermogravimetric analyzer (TGA). Results showed that the pyrolysis of coal under CO2 was more complete than that under N2, and the final conversion of CuFe2O4 during CLC of coal reached 66.6%. SEM images and BET surface area of the fresh and the used oxygen carrier show little agglomeration during the process.

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Hsieh, Chu-Chin, Jyong-Sian Tsai et Jen-Ray Chang. « Effects of Moisture on NH3 Capture Using Activated Carbon and Acidic Porous Polymer Modified by Impregnation with H3PO4 : Sorbent Material Characterized by Synchrotron XRPD and FT-IR ». Materials 15, n^o 3 (20 janvier 2022) : 784. http://dx.doi.org/10.3390/ma15030784.

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The performances of reactive adsorbents, H3PO4/C (activated carbon) and H3PO4/A (Amberlyst 35), in removing NH3 from a waste-gas stream were investigated using a breakthrough column. Accelerated aging tests investigated the effects of the water content on the performance of the adsorbents. Results of breakthrough tests show that the adsorption capacity greatly decreased with the drying time of H3PO4/C preparation. Synchrotron XRPD indicated increased amorphous phosphorus species formation with drying time. Nitrogen adsorption-desorption isotherms results further suggested that the evaporation of water accommodated in macropores decreases adsorption capacity besides the formation of the amorphous species. Introducing water moisture to the NH3 stream increases the adsorption capacity concomitant with the conversion of some NH4H2PO4 to (NH4)2HPO4. Due to the larger pore of cylindrical type and more hydrophilic for acidic porous polymer support, as opposed to slit-type for the activated carbon, the adsorption capacity of H3PO4/A is about 3.4 times that of H3PO4/C. XRPD results suggested that NH3 reacts with aqueous H3PO4 to form NH4H2PO4, and no significant macropore-water evaporation was observed when acidic porous polymer support was used, as evidenced by N2 isotherms characterizing used H3PO4/A.

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Micheli, Francesca, Enrica Mattucci, Claire Courson et Katia Gallucci. « Bi-Functional Catalyst/Sorbent for a H2-Rich Gas from Biomass Gasification ». Processes 9, n^o 7 (19 juillet 2021) : 1249. http://dx.doi.org/10.3390/pr9071249.

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The aim of this work is to identify the effect of the CaO phase as a CO2 sorbent and mayenite (Ca12Al14O33) as a stabilizing phase in a bi-functional material for CO2 capture in biomass syngas conditioning and cleaning at high temperature. The effect of different CaO weight contents is studied (0, 56, 85, 100 wt%) in sorbents synthesized by the wet mixing method. These high temperature solid sorbents are upgraded to bi-functional compounds by the addition of 3 or 6 wt% of nickel chosen as the metal active phase. N2 adsorption, X-ray diffraction, scanning electronic microscopy, temperature-programmed reduction analyses and CO2 sorption study were performed to characterize structural, textural, reducibility and sorption properties of bi-functional materials. Finally, sorption-enhanced reforming of toluene (chosen as tar model), of methane then of methane and toluene with bi-functional compounds were performed to study the best material to improve H2 content in a syngas, provided by steam biomass gasification. If the catalytic activity on the sorption enhanced reforming of methane exhibits a fast fall-down after 10–15 min of experimental test, the reforming of toluene reaches a constant conversion of 99.9% by using bi-functional materials.

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Fasolini, Andrea, Silvia Ruggieri, Cristina Femoni et Francesco Basile. « Highly Active Catalysts Based on the Rh4(CO)12 Cluster Supported on Ce0.5Zr0.5 and Zr Oxides for Low-Temperature Methane Steam Reforming ». Catalysts 9, n^o 10 (25 septembre 2019) : 800. http://dx.doi.org/10.3390/catal9100800.

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Syngas and Hydrogen productions from methane are industrially carried out at high temperatures (900 °C). Nevertheless, low-temperature steam reforming can be an alternative for small-scale plants. In these conditions, the process can also be coupled with systems that increase the overall efficiency such as hydrogen purification with membranes, microreactors or enhanced reforming with CO2 capture. However, at low temperature, in order to get conversion values close to the equilibrium ones, very active catalysts are needed. For this purpose, the Rh4(CO)12 cluster was synthetized and deposited over Ce0.5Zr0.5O2 and ZrO2 supports, prepared by microemulsion, and tested in low-temperature steam methane reforming reactions under different conditions. The catalysts were active at 750 °C at low Rh loadings (0.05%) and outperformed an analogous Rh-impregnated catalyst. At higher Rh concentrations (0.6%), the Rh cluster deposited on Ce0.5Zr0.5 oxide reached conversions close to the equilibrium values and good stability over long reaction time, demonstrating that active phases derived from Rh carbonyl clusters can be used to catalyze steam reforming reactions. Conversely, the same catalyst suffered from a fast deactivation at 500 °C, likely related to the oxidation of the Rh phase due to the oxygen-mobility properties of Ce. Indeed, at 500 °C the Rh-based ZrO2-supported catalyst was able to provide stable results with higher conversions. The effects of different pretreatments were also investigated: at 500 °C, the catalysts subjected to thermal treatment, both under N2 and H2, proved to be more active than those without the H2 treatment. In general, this work highlights the possibility of using Rh carbonyl-cluster-derived supported catalysts in methane reforming reactions and, at low temperature, it showed deactivation phenomena related to the presence of reducible supports.

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Duma, Zama G., Xoliswa Dyosiba, John Moma, Henrietta W. Langmi, Benoit Louis, Ksenia Parkhomenko et Nicholas M. Musyoka. « Thermocatalytic Hydrogenation of CO2 to Methanol Using Cu-ZnO Bimetallic Catalysts Supported on Metal–Organic Frameworks ». Catalysts 12, n^o 4 (5 avril 2022) : 401. http://dx.doi.org/10.3390/catal12040401.

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The thermocatalytic hydrogenation of carbon dioxide (CO2) to methanol is considered as a potential route for green hydrogen storage as well as a mean for utilizing captured CO2, owing to the many established applications of methanol. Copper–zinc bimetallic catalysts supported on a zirconium-based UiO-66 metal–organic framework (MOF) were prepared via slurry phase impregnation and benchmarked against the promoted, co-precipitated, conventional ternary CuO/ZnO/Al2O3 (CZA) catalyst for the thermocatalytic hydrogenation of CO2 to methanol. A decrease in crystallinity and specific surface area of the UiO-66 support was observed using X-ray diffraction and N2-sorption isotherms, whereas hydrogen-temperature-programmed reduction and X-ray photoelectron spectroscopy revealed the presence of copper active sites after impregnation and thermal activation. Other characterisation techniques such as scanning electron microscopy, transmission electron microscopy, and thermogravimetric analysis were employed to assess the physicochemical properties of the resulting catalysts. The UiO-66 (Zr) MOF-supported catalyst exhibited a good CO2 conversion of 27 and 16% selectivity towards methanol, whereas the magnesium-promoted CZA catalyst had a CO2 conversion of 31% and methanol selectivity of 24%. The prepared catalysts performed similarly to a CZA commercial catalyst which exhibited a CO2 conversion and methanol selectivity of 30 and 15%. The study demonstrates the prospective use of Cu-Zn bimetallic catalysts supported on MOFs for direct CO2 hydrogenation to produce green methanol.

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Dubadi, Rabindra, Ewelina Weidner, Bogdan Samojeden, Teofil Jesionowski, Filip Ciesielczyk, Songping Huang et Mietek Jaroniec. « Exploring the Multifunctionality of Mechanochemically Synthesized γ-Alumina with Incorporated Selected Metal Oxide Species ». Molecules 28, n^o 5 (21 février 2023) : 2002. http://dx.doi.org/10.3390/molecules28052002.

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γ-Alumina with incorporated metal oxide species (including Fe, Cu, Zn, Bi, and Ga) was synthesized by liquid-assisted grinding—mechanochemical synthesis, applying boehmite as the alumina precursor and suitable metal salts. Various contents of metal elements (5 wt.%, 10 wt.%, and 20 wt.%) were used to tune the composition of the resulting hybrid materials. The different milling time was tested to find the most suitable procedure that allowed the preparation of porous alumina incorporated with selected metal oxide species. The block copolymer, Pluronic P123, was used as a pore-generating agent. Commercial γ−alumina (SBET = 96 m2·g−1), and the sample fabricated after two hours of initial grinding of boehmite (SBET = 266 m2·g−1), were used as references. Analysis of another sample of γ-alumina prepared within 3 h of one-pot milling revealed a higher surface area (SBET = 320 m2·g−1) that did not increase with a further increase in the milling time. So, three hours of grinding time were set as optimal for this material. The synthesized samples were characterized by low-temperature N2 sorption, TGA/DTG, XRD, TEM, EDX, elemental mapping, and XRF techniques. The higher loading of metal oxide into the alumina structure was confirmed by the higher intensity of the XRF peaks. Samples synthesized with the lowest metal oxide content (5 wt.%) were tested for selective catalytic reduction of NO with NH3 (NH3-SCR). Among all tested samples, besides pristine Al2O3 and alumina incorporated with gallium oxide, the increase in reaction temperature accelerated the NO conversion. The highest NO conversion rate was observed for Fe2O3-incorporated alumina (70%) at 450 °C and CuO-incorporated alumina (71%) at 300 °C. The CO2 capture was also studied for synthesized samples and the sample of alumina with incorporated Bi2O3 (10 wt.%) gave the best result (1.16 mmol·g−1) at 25 °C, while alumina alone could adsorb only 0.85 mmol·g−1 of CO2. Furthermore, the synthesized samples were tested for antimicrobial properties and found to be quite active against Gram-negative bacteria, P. aeruginosa (PA). The measured Minimum Inhibitory Concentration (MIC) values for the alumina samples with incorporated Fe, Cu, and Bi oxide (10 wt.%) were found to be 4 µg·mL−1, while 8 µg·mL−1 was obtained for pure alumina.

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Coskun, Oguz Kagan, Saudagar Dongare, Aidan Klemm et Burcu E. Gurkan. « The Role of Imidazolium 2-Cyanopyrrolide Ionic Liquid in Reduction of CO₂to CO, Formate, and Ethylene on Copper Electrode Revealed By SERS ». ECS Meeting Abstracts MA2023-01, n^o 46 (28 août 2023) : 2501. http://dx.doi.org/10.1149/ma2023-01462501mtgabs.

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Electrochemical conversion of CO2 over copper catalyst is known to produce higher value products such as methane, ethylene, formate and alcohols in aqueous electrolytes. Since CO2 is a stable molecule, the electrochemical reduction reaction requires significant overpotential (-1.9 V vs SHE) for the first electron transfer to form CO2 -. Ionic liquids (ILs) have high CO2 solubility and can be further functionalized to bind with CO2 such that CO2 can be brought to the electrode surface in a more reactive state. In this study, we studied electroreduction of CO2 over copper in non-aqueous electrolyte with the reactive IL 1-ethyl-3-methylimidazolium 2-cyanopyrolide ([EMIM][2-CNpyr]) in the concentration range of 0.1 to 1 M. The linear sweep voltammetry experiments show the absence of a noticeable Faradic current within the potential window of -1.8 to -2.2 V vs Ag/Ag+ under N2 demonstrating the stability of the imidazolium cation against electrochemical conversion, which is also confirmed by NMR analysis. In the presence of CO2, the onset potential of reduction is at -1.9 V vs Ag/Ag+ (-1.4 V vs. SHE) and does not change with IL concentration. By employing surface enhanced Raman spectroscopy (SERS), potential dependent changes in the interfacial microenvironment during CO2 reduction was revealed. Specifically, imidazolium enrichment and surface adsorbed CO formation were captured. These results confirmed the catalytic role of the IL by facilitating the transport of the reactive CO2 to the electrode surface via imidazolium in particular. On the other hand, surface coverage by imidazolium cations on the electrode seems to prohibit higher level of C-C couplings, thus limiting reaction products to C1 and C2 products. During 3 hrs of bulk electrolysis at -2.1 V (vs. Ag/Ag+) in an H-cell with non-aqueous negolyte containing the IL and an aqueous posolyte (proton source), gaseous products of CO and H2, liquid product of HCOO- and dissolved C2H4were determined by GC and NMR analysis, respectively. Oxidation of Cu electrode was separately captured by ex-situ XPS measurements after 3 hrs of bulk electrolysis. Even though high CO2 concentrations are achieved in ILs and they are stable at CO2 reduction conditions even after 3 hours on Cu surface, IL structure should be optimized to allow C-C coupling to obtain C2+ products.

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Mutlu, Betul, Muhammad Farhan et Israfil Kucuk. « T-Shaped Microfluidic Junction Processing of Porous Alginate-Based Films and Their Characteristics ». Polymers 11, n^o 9 (23 août 2019) : 1386. http://dx.doi.org/10.3390/polym11091386.

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In this work, highly monodisperse porous alginate films from bubble bursting were formed on a glass substrate at ambient temperature, by a T-shaped microfluidic junction device method using polyethylene glycol (PEG) stearate and phospholipid as precursors in some cases. Various polymer solution concentrations and feeding liquid flow rates were applied for the generation of monodisperse microbubbles, followed by the conversion of the bubbles to porous film structures on glass substrates. In order to compare the physical properties of polymeric solutions, the effects of alginate, PEG stearate (surfactant), and phospholipid concentrations on the flowability of the liquid in a T-shaped microfluidic junction device were studied. To tailor microbubble diameter and size distribution, a method for controlling the thinning process of the bubbles’ shell was also explored. In order to control pore size, shape, and surface as well as internal structure morphologies in the scalable forming of alginate polymeric films, the effect of the feeding liquid’s flow rate and concentrations of PEG-stearate and phospholipid was also studied. Digital microscopy images revealed that the as-formed alginate films at the flow rate of 100 µL·min−1 and the N2 gas pressure of 0.8 bar have highly monodisperse microbubbles with a polydispersity index (PDI) of approximately 6.5%. SEM captures also revealed that the as-formed alginate films with high PDI value have similar monodisperse porous surface and internal structure morphologies, with the exception that the as-formed alginate films with the help of phospholipids were mainly formed under our experimental environment. From the Fourier-transform infrared spectroscopy (FTIR), Differential scanning calorimetry (DSC) and X-ray diffraction (XRD) measurements, we concluded that no chemical composition changes, thermal influence, and crystal structural modifications were observed due to the T-shaped microfluidic junction device technique. The method used in this work could expand and enhance the use of alginate porous films in a wide range of bioengineering applications, especially in tissue engineering and drug delivery, such as studying release behaviors to different internal and surface morphologies.

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Hormis, W. G., E. Y. Kamber et J. B. Hasted. « Differential N2+-He collisions with capture ». International Journal of Mass Spectrometry and Ion Processes 69, n^o 2 (mars 1986) : 211–16. http://dx.doi.org/10.1016/0168-1176(86)87035-5.

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Jones, William D. « Carbon Capture and Conversion ». Journal of the American Chemical Society 142, n^o 11 (6 mars 2020) : 4955–57. http://dx.doi.org/10.1021/jacs.0c02356.

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Yang, Peng Fei, Zhe Wang et Hong Li Wang. « Experimental Study on Removing NO from Flue Gas Using Microwave Irradiation over Activated Carbon ». Applied Mechanics and Materials 733 (février 2015) : 403–6. http://dx.doi.org/10.4028/www.scientific.net/amm.733.403.

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The microwave catalytic reduction of NO was studied in activated carbon bed. The conversion of NO to N2 under microwave irradiation remarkably increased compared to conventional heating, which indicates that the microwave irradiation has microwave catalysis effect besides thermal effect. The effects of a series of reaction parameters on the productivity of N2 with a new microwave catalytic reactor system were investigated. The results show that NO is converted predominantly to N2 under all reaction conditions and the highest conversion of NO to N2 is up to 99.8% under optimized conditions.

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Gautier, Thomas, Nathalie Carrasco, Ilija Stefanovic, Brankica Sikimic, Guy Cernogora et Jörg Winter. « Methane Conversion in a N2CH4Radiofrequency Discharge ». Plasma Processes and Polymers 11, n^o 5 (3 mars 2014) : 472–81. http://dx.doi.org/10.1002/ppap.201300158.

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Fan, Xing, Sijing Kang, Jian Li et Tianle Zhu. « Conversion of dilute nitrous oxide (N2O) in N2 and N2–O2 mixtures by plasma and plasma-catalytic processes ». RSC Advances 8, n^o 47 (2018) : 26998–7007. http://dx.doi.org/10.1039/c8ra05607b.

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Wan, Yinji, Yefan Miao, Ruiqin Zhong et Ruqiang Zou. « High-Selective CO2 Capture in Amine-Decorated Al-MOFs ». Nanomaterials 12, n^o 22 (17 novembre 2022) : 4056. http://dx.doi.org/10.3390/nano12224056.

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Amine-functionalized metal-organic framework (MOF) material is a promising CO2 captor in the post-combustion capture process owing to its large CO2 working capacity as well as high CO2 selectivity and easy regeneration. In this study, an ethylenediamine (ED)-decorated Al-based MOFs (named ED@MOF-520) with a high specific area and permanent porosity are prepared and evaluated to study the adsorption and separation of CO2 from N2. The results show that ED@MOF-520 adsorbent displays a superior CO2 capture performance with a CO2/N2 separation factor of 50 at 273 K, 185% times increase in the CO2/N2 separation efficiency in comparison with blank MOF-520. Furthermore, ED@MOF-520 exhibits a moderate-strength interaction with 29 kJ mol−1 adsorption heat for CO2 uptake, which not only meets the requirement of CO2 adsorption but also has good cycle stability. This work provides a promising adsorbent with a high CO2/N2 separation factor to deal with carbon peak and carbon neutrality.

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Ramanan, G., et Gordon R. Freeman. « Electron thermalization distance distribution in liquid carbon monoxide : electron capture ». Canadian Journal of Chemistry 66, n^o 5 (1 mai 1988) : 1304–12. http://dx.doi.org/10.1139/v88-212.

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Electron thermalization in X irradiated liquid CO is truncated by electron capture to form an anion, as it is in liquid N2. The thermalization distance distribution in these two liquids is a modified exponential, rather than the modified Gaussian obtained in liquid hydrocarbons where electron capture does not occur. The density normalized distance parameter bEPd in CO was constant, 2.8 × 10−6 kg/m2, at densities [Formula: see text], but increased somewhat at lower densities, reaching 3.3 × 10−6 kg/m2 at d/dc = 1.4. The thermalization distances in CO are about two thirds those in N2 at the same density. Electrons are captured more readily by CO than by N2.

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Kunkely, Horst, et Arnd Vogler. « Photolysis of Aqueous [Os(NH3)5(N2)]2+. Photoreduction of Coordinated Dinitrogen to Hydrazine as a Model for a New Type of Artificial Photosynthesis ? » Zeitschrift für Naturforschung B 67, n^o 5 (1 mai 2012) : 488–90. http://dx.doi.org/10.5560/znb.2012-0080.

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In the absence of oxygen the photolysis of [Os(NH3)5(N2)]2+ leads to the reduction of the N2 ligand according to [OsII(NH3)5(N2)]2+ + H2O → [OsVI(NH3)4N]3+ + N2H4 + OH-. The photochemical formation of hydrazine from N2 is discussed with regard to the photochemical conversion and storage of solar energy.

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Hoffarth, Marc Philippe, Timo Broeker et Jan Schneider. « Effect of N2 on Biological Methanation in a Continuous Stirred-Tank Reactor with Methanothermobacter marburgensis ». Fermentation 5, n^o 3 (2 juillet 2019) : 56. http://dx.doi.org/10.3390/fermentation5030056.

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In this contribution, the effect of the presence of a presumed inert gas like N2 in the feed gas on the biological methanation of hydrogen and carbon dioxide with Methanothermobacter marburgensis was investigated. N2 can be found as a component besides CO2 in possible feed gases like mine gas, weak gas, or steel mill gas. To determine whether there is an effect on the biological methanation of CO2 and H2 from renewable sources or not, the process was investigated using feed gases containing CO2, H2, and N2 in different ratios, depending on the CO2 content. A possible effect can be a lowered conversion rate of CO2 and H2 to CH4. Feed gases containing up to 47N2 were investigated. The conversion of hydrogen and carbon dioxide was possible with a conversion rate of up to 91 but was limited by the amount of H2 when feeding a stoichiometric ratio of 4:1 and not by adding N2 to the feed gas.

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Miller-Link, Elisa, Logan Wilder, Taylor Aubry, Derek Vigil-Fowler, Jao van de Lagemaat et Debjit Ghoshal. « (Invited) Electrochemical Conversion Using 2D Transition Metal Dichalcogenides ». ECS Meeting Abstracts MA2023-01, n^o 8 (28 août 2023) : 1084. http://dx.doi.org/10.1149/ma2023-0181084mtgabs.

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We use 2D transition metal dichalcogenide (TMDC) catalysts to facilitate the nitrogen (N2) reduction to ammonia (NH3) or proton reduction to hydrogen (H2) via dark electrocatalysis. TMDCs are an important class of materials because they are 2D materials, where their quantum confined properties are easily manipulated for various applications. Transition metal-based catalysts offer a unique opportunity to exploit the d electrons and orbitals for N2 activation, where we specifically compare theoretically and experimentally MoS2, TiS2, and VS2. In addition, the 2D TMDC catalysts are highly tunable 2D catalysts, where the band energetics, surface functionalization, defects, and phase can be tuned to control the N2 and proton reactivity. We use indophenol and 1H NMR with isotope labeling to identify and quantify NH3 from the catalytic reaction; moreover, we use density functional theory to add insight into the 2D TMDC active site and reaction pathway. Through various attempts and iterations, we have many lessons learned about experimental and theoretical setup that will be communicated.

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Chen, L., T. Yang, H. Yang et L. Wang. « Мechanism conversion process and timeliness of N2-ECBM ». Mining of Mineral Deposits 12, n^o 4 (30 décembre 2018) : 90–99. http://dx.doi.org/10.15407/mining12.04.090.

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Altarawneh, Mohammednoor, Zainab Jaf, Hans Oskierski, Zhong-Tao Jiang, Jeff Gore et Bogdan Z. Dlugogorski. « Conversion of NO into N2 over γ-Mo2N ». Journal of Physical Chemistry C 120, n^o 39 (22 septembre 2016) : 22270–80. http://dx.doi.org/10.1021/acs.jpcc.6b04107.

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Freyre, Paige, Emalee St. Pierre et Thomas Rybolt. « Carbon Dioxide Capture by Adsorption in a Model Hydroxy-Modified Graphene Pore ». International Journal of Molecular Sciences 24, n^o 14 (14 juillet 2023) : 11452. http://dx.doi.org/10.3390/ijms241411452.

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Concerns regarding the environmental impact of increasing levels of anthropogenic carbon dioxide have led to a variety of studies examining solid surfaces for their ability to trap this greenhouse gas (GHG). Atmospheric or post-combustion carbon capture requires an efficient separation of carbon dioxide and nitrogen gas. We used the molecular mechanics MM3 parameter set (previously shown to provide good estimates of molecule–surface binding energies) to calculate theoretical surface binding energies for carbon dioxide ∆E(CO2) and nitrogen ∆E(N2). For efficient separation, differentiation of these two gas-surface adsorption energies is required. Examined structures based on graphene, carbon slit width pore, and carbon nanotube gave ∆E(CO2) to ∆E(N2) ratios of 1.7, 1.8, and 1.9, respectively. To enhance the CO2 adsorption, we developed a model graphene surface pore lined with four hydroxy groups whose orientation allowed them to form hydrogen bonds with the oxygens in CO2. Both the single-layer and double-layer versions of this pore gave significant enhancement in the ability to trap CO2 preferentially to N2. The two-layer version of this pore gave ∆E(CO2) = 73 and ∆E(N2) = 6.8 kJ/mol. The one- and two-layer versions of this novel pore averaged a ∆E(CO2) to ∆E(N2) ratio of 12.

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Zhang, Haihui, Huihui Xiong et Wei Liu. « SiC3 as a Charge-Regulated Material for CO2 Capture ». Crystals 11, n^o 5 (13 mai 2021) : 543. http://dx.doi.org/10.3390/cryst11050543.

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The increasing CO2 emission rate is deteriorating the atmospheric environment, leading to global warming and climate change. The potential of the SiC3 nanosheet as a functioning material for the separation of CO2 from the mixture of CO2, H2, N2 and CH4 by injecting negative charges is studied by DFT calculations in this paper. The results show that in the absence of injecting negative charges, CO2 interacts weakly with the SiC3 nanosheet. While the interaction between CO2 and the SiC3 nanosheet can be strengthened by the injection of negative charges, the absorption mechanism of CO2 changes from physisorption to chemisorption when the injection of negative charges is switched on. H2/N2/CH4 are all physiosorbed on the SiC3 nanosheet with/without the injection of negative charges. The mechanism of CO2 adsorption/desorption on the SiC3 nanosheet could be tuned by switching on/off the injection of negative charges. Our results indicate that the SiC3 nanosheet can be regarded as a charge-regulated material for the separation of CO2 from the CO2/H2/N2/CH4 mixture.

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Bogaerts, Annemie. « Editorial Catalysts : Special Issue on Plasma Catalysis ». Catalysts 9, n^o 2 (21 février 2019) : 196. http://dx.doi.org/10.3390/catal9020196.

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Plasma catalysis is gaining increasing interest for various gas conversion applications, such as CO2 conversion into value-added chemicals and fuels, N2 fixation for the synthesis of NH3 or NOx, and CH4 conversion into higher hydrocarbons or oxygenates [...]

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Zhu, Ai-Min, Qi Sun, Jin-Hai Niu, Yong Xu et Zhi-Min Song. « Conversion of NO in NO/N2, NO/O2/N2, NO/C2H4/N2 and NO/C2H4/O2/N2 Systems by Dielectric Barrier Discharge Plasmas ». Plasma Chemistry and Plasma Processing 25, n^o 4 (août 2005) : 371–86. http://dx.doi.org/10.1007/s11090-004-3134-7.

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Reis Machado, Ana S., et Manuel Nunes da Ponte. « CO 2 capture and electrochemical conversion ». Current Opinion in Green and Sustainable Chemistry 11 (juin 2018) : 86–90. http://dx.doi.org/10.1016/j.cogsc.2018.05.009.

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Xu, Song, Laura A. Essex, Joseph Q. Nguyen, Phillip Farias, Joseph W. Ziller, W. Hill Harman et William J. Evans. « Cooperative dinitrogen capture by a diboraanthracene/samarocene pair ». Dalton Transactions 50, n^o 42 (2021) : 15000–15002. http://dx.doi.org/10.1039/d1dt03220h.

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Serrano, Romina, Pablo Martín Cuesta, Elio Emilio Gonzo et Mónica Parentis. « AMINE-GRAFTED MESOPOROUS SILICA FOR CO2 CAPTURE ». Latin American Applied Research - An international journal 50, n^o 3 (29 mars 2020) : 167–73. http://dx.doi.org/10.52292/j.laar.2020.138.

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Three-aminopropyltriethoxysilane modified MCM-41 mesoporous silicas were synthesized by grafting the organic groups on the support surface, using different molar ratios of SiO2:Aminosilane. The synthesized solids were characterized by N2 adsorption, XRD, FTIR and TG-DTA. MCM-41 has a specific surface area of about 1500 m2/g, while that of the functionalized materials falls around 600 m2/g, showing a tendency to decrease as the content of the functionalizing agent grows. The N2 adsorption isotherms of pure and functionalized materials are characteristic of mesoporous type IV materials. The structural properties were studied by FTIR and XRD. TG-DTA studies allow analyzing the thermal stability of the materials and determining the deposited amine content. The aminosilane modified mesoporous silica materials increase the CO2 adsorption capacity compared to that of the pure MCM-41. The results obtained are well interpreted by Freundlich physicochemical model and the model parameters show a linear correlation with APTES molar content in the samples.

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Jiang, Qiwei, et Meng Guo. « Network Structure Engineering of Organosilica Membranes for Enhanced CO2 Capture Performance ». Membranes 12, n^o 5 (27 avril 2022) : 470. http://dx.doi.org/10.3390/membranes12050470.

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The membrane separation process for targeted CO2 capture application has attracted much attention due to the significant advantages of saving energy and reducing consumption. High-performance separation membranes are a key factor in the membrane separation system. In the present study, we conducted a detailed examination of the effect of calcination temperatures on the network structures of organosilica membranes. Bis(triethoxysilyl)acetylene (BTESA) was selected as a precursor for membrane fabrication via the sol-gel strategy. Calcination temperatures affected the silanol density and the membrane pore size, which was evidenced by the characterization of FT-IR, TG, N2 sorption, and molecular size dependent gas permeance. BTESA membrane fabricated at 500 °C showed a loose structure attributed to the decomposed acetylene bridges and featured an ultrahigh CO2 permeance around 15,531 GPU, but low CO2/N2 selectivity of 3.8. BTESA membrane calcined at 100 °C exhibited satisfactory CO2 permeance of 3434 GPU and the CO2/N2 selectivity of 22, displaying great potential for practical CO2 capture application.

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Ali, A. H. M., P. A. Christensen, J. Norruwaida, M. P. Khirunnisa et Mohd Nor Syahrir Abdullah. « Non-Thermal Plasma Conversion of N2, CO2 And CH4 ». IOP Conference Series : Materials Science and Engineering 1051, n^o 1 (1 février 2021) : 012072. http://dx.doi.org/10.1088/1757-899x/1051/1/012072.

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Tang, Junwang, Tao Zhang, Dongbai Liang, Changhai Xu, Xiaoying Sun et Liwu Lin. « Microwave discharge-assisted catalytic conversion of NO to N2 ». Chemical Communications, n^o 19 (2000) : 1861–62. http://dx.doi.org/10.1039/b003499l.

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Ohtsuka, Yasuo, Hiroshi Mori, Katsutoshi Nonaka, Takashi Watanabe et Kenji Asami. « Selective conversion of coal nitrogen to N2 with iron ». Energy & ; Fuels 7, n^o 6 (novembre 1993) : 1095–96. http://dx.doi.org/10.1021/ef00042a056.

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Talapaneni, Siddulu Naidu, Gurwinder Singh, In Young Kim, Khalid AlBahily, Ala'a H. Al‐Muhtaseb, Ajay S. Karakoti, Ehsan Tavakkoli et Ajayan Vinu. « Carbon Capture and Conversion : Nanostructured Carbon Nitrides for CO 2 Capture and Conversion (Adv. Mater. 18/2020) ». Advanced Materials 32, n^o 18 (mai 2020) : 2070142. http://dx.doi.org/10.1002/adma.202070142.

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Shervani, Suboohi, Lara P. Tansug et F. Handan Tezel. « Microporous Adsorbent-Based Mixed Matrix Membranes for CO2/N2 Separation ». Energies 17, n^o 8 (18 avril 2024) : 1927. http://dx.doi.org/10.3390/en17081927.

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As the atmospheric carbon dioxide (CO2) concentration rapidly rises, carbon capture, utilization, and storage (CCUS) is an emerging field for climate change mitigation. Various carbon capture technologies are in development with the help of adsorbents, membranes, solvent-based systems, etc. One of the main challenges in this field is the removal of CO2 from nitrogen (N2) gas. This paper focuses on mixed matrix membrane technology, for which the CO2/N2 separation performance is based on differences in gas permeations. Membrane separation and purification technologies are widely studied for carbon capture. Microporous adsorbents such as zeolites and metal organic frameworks (MOFs) for carbon capture have been attracting researchers’ attention due to their highly porous structures, high selectivity values, and tunable porosities. Utilizing microporous adsorbents dispersed within a novel, blended polymer matrix, fourteen membranes were prepared with the commercial MOF ZIF-8, zeolite 13X, and kaolin, with methyl cellulose (MC) and polyvinyl alcohol (PVA), which were tested using a single gas permeation setup in this study. The addition of polyallylamine (PAH) as a chemisorbent was also investigated. These membranes were synthesized both with and without a polyacrylonitrile (PAN) support to compare their performances. MC was found to be an ideal polymeric matrix component to develop free-standing MMMs. At 24 °C and a relatively low feed pressure of 2.36 atm, a free-standing zeolite-13X-based membrane (MC/PAH/13X/PVA) exhibited the highest N2/CO2 selectivity of 2.8, with a very high N2 permeability of 6.9 × 107 Barrer. Upon the optimization of active layer thickness and filler weight percentages, this easily fabricated free-standing MMM made of readily available materials is a promising candidate for CO2 purification through nitrogen removal.

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Li, Pengli, Yongli Shen, Dandan Wang, Yanli Chen et Yunfeng Zhao. « Selective Adsorption-Based Separation of Flue Gas and Natural Gas in Zirconium Metal-Organic Frameworks Nanocrystals ». Molecules 24, n^o 9 (11 mai 2019) : 1822. http://dx.doi.org/10.3390/molecules24091822.

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Carbon capture from flue gas and natural gas offers a green path to construct a net-zero emissions economic system. Selective adsorption-based gas separation by employing metal-organic frameworks (MOFs) is regarded as a promising technology due to the advantages of simple processing, easy regeneration and high efficiency. We synthesized two Zirconium MOFs (UiO-66 and UiO-66-NH2) nanocrystals for selective capture and further removal of CO2 from flue gas and natural gas. In particular, UiO-66-NH2 nanocrystals have a smaller grain size, a large amount of defects, and pending –NH2 groups inside their pores which display effective CO2 selective adsorption abilities over CH4 and N2 with the theoretical separation factors of 20 and 7. This breakthrough experiment further verified the selective adsorption-based separation process of natural gas and flue gas. In one further step, we used the Monte Carlo simulation to investigate the optimized adsorption sites and energy of CO2, N2 and CH4 molecules in the gas mixture. The significantly large adsorption energy of CO2 (0.32 eV) over N2 (0.19 eV) and N2 (0.2 eV) may help us to reveal the selective adsorption mechanism.

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Miller-Link, Elisa. « (Invited) Electrochemical Conversion of Nitrogen to Ammonia Using 2D Transition Metal Dichalcogenides ». ECS Meeting Abstracts MA2022-02, n^o 49 (9 octobre 2022) : 1926. http://dx.doi.org/10.1149/ma2022-02491926mtgabs.

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We use 2D transition metal dichalcogenide (TMDC) catalysts to facilitate the nitrogen (N2) reduction to ammonia (NH3) via dark electrocatalysis. TMDCs are an important class of materials because they can be reduced to 2D, where their quantum confined properties are easily manipulated for various applications. Transition metal-based catalysts offer a unique opportunity to exploit the d electrons and orbitals for N2 activation, where we specifically compare theoretically and experimentally MoS2, TiS2, and VS2. In addition, the 2D TMDC catalysts are highly tunable 2D catalysts, where the band energetics, surface functionalization, defects, and phase can be tuned to control the N2 reactivity. We use indophenol and 1H NMR with isotope labeling to identify and quantify NH3 from the catalytic reaction and not from setup/system contaminants; moreover, we use density functional theory to add insight into the 2D TMDC active site and reaction pathway. Through various attempts and iterations, we have many lessons learned about experimental and theoretical setup that will be communicated.

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Lv, Ze-Jie, Junnian Wei, Wen-Xiong Zhang, Ping Chen, Dehui Deng, Zhang-Jie Shi et Zhenfeng Xi. « Direct transformation of dinitrogen : synthesis of N-containing organic compounds via N−C bond formation ». National Science Review 7, n^o 10 (23 juin 2020) : 1564–83. http://dx.doi.org/10.1093/nsr/nwaa142.

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Abstract N-containing organic compounds are of vital importance to lives. Practical synthesis of valuable N-containing organic compounds directly from dinitrogen (N2), not through ammonia (NH3), is a holy-grail in chemistry and chemical industry. An essential step for this transformation is the functionalization of the activated N2 units/ligands to generate N−C bonds. Pioneering works of transition metal-mediated direct conversion of N2 into organic compounds via N−C bond formation at metal-dinitrogen [N2-M] complexes have generated diversified coordination modes and laid the foundation of understanding for the N−C bond formation mechanism. This review summarizes those major achievements and is organized by the coordination modes of the [N2-M] complexes (end-on, side-on, end-on-side-on, etc.) that are involved in the N−C bond formation steps, and each part is arranged in terms of reaction types (N-alkylation, N-acylation, cycloaddition, insertion, etc.) between [N2-M] complexes and carbon-based substrates. Additionally, earlier works on one-pot synthesis of organic compounds from N2 via ill-defined intermediates are also briefed. Although almost all of the syntheses of N-containing organic compounds via direct transformation of N2 so far in the literature are realized in homogeneous stoichiometric thermochemical reaction systems and are discussed here in detail, the sporadically reported syntheses involving photochemical, electrochemical, heterogeneous thermo-catalytic reactions, if any, are also mentioned. This review aims to provide readers with an in-depth understanding of the state-of-the-art and perspectives of future research particularly in direct catalytic and efficient conversion of N2 into N-containing organic compounds under mild conditions, and to stimulate more research efforts to tackle this long-standing and grand scientific challenge.

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Wang, Qi, Yang Chen, Puxu Liu, Yi Wang, Jiangfeng Yang, Jinping Li et Libo Li. « CO2 Capture from High-Humidity Flue Gas Using a Stable Metal–Organic Framework ». Molecules 27, n^o 17 (31 août 2022) : 5608. http://dx.doi.org/10.3390/molecules27175608.

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The flue gas from fossil fuel power plants is a long-term stable and concentrated emission source of CO2, and it is imperative to reduce its emission. Adsorbents have played a pivotal role in reducing CO2 emissions in recent years, but the presence of water vapor in flue gas poses a challenge to the stability of adsorbents. In this study, ZIF-94, one of the ZIF adsorbents, showed good CO2 uptake (53.30 cm3/g), and the calculated CO2/N2 (15:85, v/v) selectivity was 54.12 at 298 K. Because of its excellent structural and performance stability under humid conditions, the CO2/N2 mixture was still well-separated on ZIF-94 with a separation time of 30.4 min when the relative humidity was as high as 99.2%, which was similar to the separation time of the dry gas experiments (33.2 min). These results pointed to the enormous potential applications of ZIF-94 for CO2/N2 separation under high humidity conditions in industrial settings.

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Alarcón, F. B., B. E. Fuentes, H. Martínez et F. B. Yousif. « Single electron capture measurements in collisions of K+ on N2 ». Nuclear Instruments and Methods in Physics Research Section B : Beam Interactions with Materials and Atoms 332 (août 2014) : 317–20. http://dx.doi.org/10.1016/j.nimb.2014.02.086.

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Sullivan, Ian, Andrey Goryachev, Ibadillah A. Digdaya, Xueqian Li, Harry A. Atwater, David A. Vermaas et Chengxiang Xiang. « Coupling electrochemical CO2 conversion with CO2 capture ». Nature Catalysis 4, n^o 11 (novembre 2021) : 952–58. http://dx.doi.org/10.1038/s41929-021-00699-7.

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Kafi, Maedeh, Hamidreza Sanaeepur et Abtin Ebadi Amooghin. « Grand Challenges in CO2 Capture and Conversion ». Journal of Resource Recovery 1, n^o 2 (1 avril 2023) : 0. http://dx.doi.org/10.52547/jrr.2302-1007.

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Shen, Yafei. « Molten salt-mediated carbon capture and conversion ». Fuel 339 (mai 2023) : 127473. http://dx.doi.org/10.1016/j.fuel.2023.127473.

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Yang, Fengfan, Xiaolu Wang, Jiayue Tian, Xusheng Wang et Linfeng Liang. « Construction of Water Vapor Stable Ultramicroporous Copper-Based Metal–Organic Framework for Efficient CO2 Capture ». Processes 11, n^o 5 (4 mai 2023) : 1387. http://dx.doi.org/10.3390/pr11051387.

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It is quite essential to obtain an excellent CO2 adsorption capacity, CO2 adsorption selectivity and water vapor stability at the same time for practical CO2 capture after combustion. Through the combination of ultramicropore and the high density of CO2-philic sites without OMSs, an ultra-microporous Cu-based metal–organic framework has been designed and synthesized, featuring a high CO2 capacity (99 cm3 g−1 and 56.6 cm3 g−1 at 273 K and 298 K, respectively), high selectivity over N2 (118 at a scale of CO2/N2 15/85, 298 K) and excellent water vapor stability, simultaneously. Theoretical calculations indicate that neighboring ketonic O atoms with suitable distance play vital roles in boosting CO2 selective capture.

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Romano, Valentino, Giovanna D’Angelo, Siglinda Perathoner et Gabriele Centi. « Current density in solar fuel technologies ». Energy & ; Environmental Science 14, n^o 11 (2021) : 5760–87. http://dx.doi.org/10.1039/d1ee02512k.

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Doyle, Laurence R., Peter J. Hill, Gregory G. Wildgoose et Andrew E. Ashley. « Teaching old compounds new tricks : efficient N2 fixation by simple Fe(N2)(diphosphine)2 complexes ». Dalton Transactions 45, n^o 18 (2016) : 7550–54. http://dx.doi.org/10.1039/c6dt00884d.

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The Fe(0) species Fe(N₂)(dmpe)₂ exists in equilibrium with the previously unreported dimer, [Fe(dmpe₂)₂(μ-N₂)]. For the first time these complexes, alongside Fe(N₂)(depe)₂, are shown unambiguously to produce N₂H₄ and/or NH₃ upon addition of triflic acid; for Fe(N₂)(depe)₂ this represents one of the highest electron conversion efficiencies for Fe complexes to date.

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Kim, Hyeonjin, et Yun-Ho Ahn. « Selective CO2 Capture from CO2/N2 Gas Mixtures Utilizing Tetrabutylammonium Fluoride Hydrates ». Molecules 29, n^o 6 (14 mars 2024) : 1284. http://dx.doi.org/10.3390/molecules29061284.

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Gas hydrates, a type of inclusion compound capable of trapping gas molecules within a lattice structure composed of water molecules, are gaining attention as an environmentally benign gas storage or separation platform. In general, the formation of gas hydrates from water requires high-pressure and low-temperature conditions, resulting in significant energy consumption. In this study, tetrabutylammonium fluoride (TBAF) was utilized as a thermodynamic promoter forming a semi-clathrate-type hydrate, enabling gas capture or separation at room temperature. Those TBAF hydrate systems were explored to check their capability of CO2 separation from flue gas, the mixture of CO2 and N2 gases. The formation rates and gas storage capacities of TBAF hydrates were systematically investigated under various concentrations of CO2, and they presented selective CO2 capture behavior during the hydrate formation process. The maximum gas storage capacities were achieved at 2.36 and 2.38 mmol/mol for TBAF·29.7 H2O and TBAF·32.8 H2O hydrate, respectively, after the complete enclathration of the feed gas of CO2 (80%) + N2 (20%). This study provides sufficient data to support the feasibility of TBAF hydrate systems to be applied to CO2 separation from CO2/N2 gas mixtures based on their CO2 selectivity.

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