Literatura académica sobre el tema "Zeolite SAPO-34"
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Artículos de revistas sobre el tema "Zeolite SAPO-34"
Zhou, Yida, Jiani Zhang, Wenyan Ma, Xin Yin, Guangrui Chen, Yinghao Liu y Jiyang Li. "Small pore SAPO-14-based zeolites with improved propylene selectivity in the methanol to olefins process". Inorganic Chemistry Frontiers 9, n.º 8 (2022): 1752–60. http://dx.doi.org/10.1039/d2qi00155a.
Texto completoXiao, Xia, Zhongliang Xu, Peng Wang, Xinfei Liu, Xiaoqiang Fan, Lian Kong, Zean Xie y Zhen Zhao. "Solvent-Free Synthesis of SAPO-34 Zeolite with Tunable SiO2/Al2O3 Ratios for Efficient Catalytic Cracking of 1-Butene". Catalysts 11, n.º 7 (10 de julio de 2021): 835. http://dx.doi.org/10.3390/catal11070835.
Texto completoUsman, Muhammad. "Recent Progress of SAPO-34 Zeolite Membranes for CO2 Separation: A Review". Membranes 12, n.º 5 (10 de mayo de 2022): 507. http://dx.doi.org/10.3390/membranes12050507.
Texto completoJunaidi, M. U. M., C. P. Leo, S. N. M. Kamal y A. L. Ahmad. "Fouling mitigation in humic acid ultrafiltration using polysulfone/SAPO-34 mixed matrix membrane". Water Science and Technology 67, n.º 9 (1 de mayo de 2013): 2102–9. http://dx.doi.org/10.2166/wst.2013.098.
Texto completoWang, Bin, Ying Zhang, Fu Bo Gu, Min Zuo y Guang Sheng Guo. "Acid Strength Measurement of Zeolites by the TPD-IR Technique with Ammonia as Probe Molecule". Applied Mechanics and Materials 475-476 (diciembre de 2013): 1270–74. http://dx.doi.org/10.4028/www.scientific.net/amm.475-476.1270.
Texto completoUsman, Muhammad, Jiang Zhu, Kong Chuiyang, Muhammad Tahir Arslan, Abuzar Khan, Ahmad Galadima, Oki Muraza et al. "Propene Adsorption-Chemisorption Behaviors on H-SAPO-34 Zeolite Catalysts at Different Temperatures". Catalysts 9, n.º 11 (5 de noviembre de 2019): 919. http://dx.doi.org/10.3390/catal9110919.
Texto completoChen, Xueshuai, Rongli Jiang, Huilin Hou, Zihan Zhou y Xingwen Wang. "Synthesis of ZSM-5/SAPO-34 zeolite composites from LAPONITE® and their catalytic properties in the MTO reaction". CrystEngComm 22, n.º 37 (2020): 6182–88. http://dx.doi.org/10.1039/d0ce01002b.
Texto completoChen, Yanping, Yiming Xu, Dang-guo Cheng, Yingcai Chen, Fengqiu Chen, Xiaoyong Lu, Yiping Huang y Songbo Ni. "Synthesis of CuO–ZnO–Al2O3 @ SAPO-34 core@shell structured catalyst by intermediate layer method". Pure and Applied Chemistry 86, n.º 5 (19 de mayo de 2014): 775–83. http://dx.doi.org/10.1515/pac-2013-1121.
Texto completoXia, Wei, Qi Sun, Shang Wen Liu, Lin Ping Qiang y Yuan Cun Cui. "SAPO-34/SiO2 Catalysts for the Transformation of Ethanol into Propylene". Advanced Materials Research 1004-1005 (agosto de 2014): 707–10. http://dx.doi.org/10.4028/www.scientific.net/amr.1004-1005.707.
Texto completoLi, Duichun, Bin Xing, Baojun Wang y Ruifeng Li. "Theoretical Study of Zirconium Isomorphous Substitution into Zeolite Frameworks". Molecules 24, n.º 24 (5 de diciembre de 2019): 4466. http://dx.doi.org/10.3390/molecules24244466.
Texto completoTesis sobre el tema "Zeolite SAPO-34"
Molina, Gonzalez Sonia. "Analyse du couplage des fonctions de filtration des suies et de réduction des NOx pour moteur diesel". Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1290.
Texto completoAftertreatment systems that combine various functionalities into the same catalytic device are considered to be an efficient solution to reach the target defined by the restrictive future emission standards that regulate the automotive industry emissions. They are able not only to reduce the intrinsic costs due to the packaging but also, in some cases, to promote catalytic reactions by thermal or synergistic effects. This concept is being particularly explored for Diesel engines whose exhaust line may comprise up to four separate elements. NOx abatement can be accomplished by ammonia selective catalytic reduction on filter (NH3-SCRF) using Cu or Fe-exchanged zeolite-based as catalysts. This catalysed soot filter assumes two functions, simultaneously: removal of particles and reduction of NOx species towards N2. Regarding the SCR catalysts, the active layer is conventionally deposited onto the walls of a high porosity substrate whose channels are blocked at alternative ends. An increased porosity of the filter (such as cordierite or SiC) substrate is required to allow the deposition of the amount of catalyst phase needed for the treatment of gaseous emissions while efficient filtration and without producing a backpressure effect. Furthermore, it is necessary to remark that new reactions will occur in this system as Diesel soot, NOx and the reductant agent are present in the same unit for the first time. Accordingly to the literature currently available, there are three main ways that NOx pollutants and soot may interact: 1) soot blocking the accessibility of gas flow to “classic” active sites of the catalyst; 2) possibility of NOx reduction takes place over the soot particles; and finally, 3) soot presence affects SCR reactions performance or, contrarily, SCR reactions affects PM oxidation process as far as competition for NO2 will be produced
Onder, Aylin. "Synthesis Of Zeolite Membranes In Flow System". Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614815/index.pdf.
Texto completoC and 220°
C, and the corresponding system pressures were approximately 20 and 30 bars for MFI and SAPO-34, respectively. The CH4 and n-C4H10 single gas permeances were measured through MFI membranes and the performance of membranes was investigated in the separation of equimolar CH4/n-C4H10 mixtures. The best MFI membrane had a CH4 single gas permeance of 1.45x10-6 mol/m2-s-Pa and CH4/n-C4H10 ideal selectivity of 35 at 25oC. The membranes preferentially permeated n-C4H10 in the separation of mixtures. The n-C4H10/CH4 separation selectivity was 43.6 with a total permeance of approximately 0.8x10-6 mol/m2-s-Pa at 25oC. The ideal selectivities of CO2/CH4 of SAPO-34 membrane synthesized in stagnant medium were 227, and >
1000 at 220 and 200oC, respectively. Formation of amorphous structure and the additional secondary phases (impurities) were observed on SAPO-34 membranes synthesized in recirculating flow system. The results showed that it is possible to produce SAPO-34 and high quality MFI membranes by a recirculating flow system operating at elevated temperature.
Cakal, Ulgen. "Natural Gas Purification By Zeolite Filled Polyethersulfone Based Mixed Matrix Membranes". Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12611206/index.pdf.
Texto completoC, with a feed pressure of 3 bar. Moreover, the membranes were characterized by scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and thermal gravimetric analyzer (TGA). The separation selectivities of all types of membranes generally observed to be independent of feed composition. The composition independency of these membranes eliminates the need of investigating at which feed gas composition the prepared membranes are best performing for practical applications. PES/SAPO-34/HMA MMMs with HMA loading of 10% and SAPO-34 loading of 20% demonstrated the highest separation selectivity of about 40, and the ideal selectivity of 44, among the used membranes.
Oral, Edibe Eda. "Effect Of Operating Parameters On Performance Of Additive/ Zeolite/ Polymer Mixed Matrix Membranes". Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12612957/index.pdf.
Texto completohowever their gas separation performances are not sufficient enough for industrial feasibility. On the other hand inorganic membranes have good separation performance but they have processing difficulties. As a consequence mixed matrix membranes (MMMs) which comprise of inorganic particles dispersed in organic matrices are developed. Moreover, to enhance the interaction between polymer and zeolite particles ternary mixed matrix membranes are introduced by using low molecular weight additives as third component and promising results were obtained at 35 °
C. Better understanding on gas transport mechanism of these membranes could be achieved by studying the effect of preparation and operating parameters. This study investigates the effect of operation temperature and annealing time and temperature on gas separation performance of MMMs. The membranes used in this study consist of glassy polyethersulfone (PES) polymer, SAPO-34 particles and 2- v hidroxy 5-methyl aniline (HMA) as compatibilizer. The membranes fabricated in previous study were used and some membranes were used as synthesized while post annealing (at 120°
C, 0.2atm, N2 atm, 7-30 days) applied to some membranes before they are tested. The temperature dependent gas transport properties of the membranes were characterized by single gas permeation measurements of H2, CO2, and CH4 gases between 35 °
C-120 °
C. The membranes also characterized by scanning electron microscopy (SEM), thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC). Annealing time and temperature affected the reproducibility and stability of the mixed matrix membranes and by applying post annealing step to mixed matrix membranes at higher temperatures and longer times, more stable membranes were obtained. For pure PES membranes thermally stable performances were obtained without any need of extra treatment. The permeabilities of all studied gases increased with increasing operation temperature. Also the selectivities of H2/CO2 were increased while CO2/CH4, H2/CH4 selectivities were decreased with temperature. The best separation performance belongs to PES/SAPO-34/HMA mixed matrix membrane at each temperature. When the temperature increased from 35 °
C to 120 °
C H2/CO2 selectivity for PES/SAPO- 34/HMA membrane was increased from 3.2 to 4.6 and H2 permeability increased from 8 Barrer to 26.50 Barrer. This results show that for H2/CO2 separation working at higher temperatures will be more advantageous. The activation energies were found in the order of
CH4 >
H2>
CO2 for all types of membranes. Activation energies were in the same order of magnitude for all membranes but the PES/SAPO-34 membrane activation energies were slightly lower than PES membrane. Furthermore, PES/SAPO-34/HMA membrane has activation energies higher than PES/SAPO-34 membrane and is very close to pure membrane which shows that HMA acts as a compatibilizer between two phases.
Crawford, Phillip Grant. "Zeolite membranes for the separation of krypton and xenon from spent nuclear fuel reprocessing off-gas". Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50383.
Texto completoGENTILE, VINCENZO MARIA. "Innovative Adsorption Heat Exchangers for Desiccant Cooling and Atmospheric Water Harvesting". Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2861334.
Texto completoLi, Zhibin. "New micro and mesoporous materials for the reaction of methanol to olefins". Doctoral thesis, Universitat Politècnica de València, 2014. http://hdl.handle.net/10251/44229.
Texto completoLi, Z. (2014). New micro and mesoporous materials for the reaction of methanol to olefins [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/44229
TESIS
Kgaphola, Kedibone Lawrence. "Synthesis and performance evaluation of Nanocomposite SAPO-34/ceramic membranes for CO₂/N₂ mixture separation". Thesis, 2017. https://hdl.handle.net/10539/24188.
Texto completoGlobal warming, resulting from emission of greenhouse gases (GHGs), is the cause of drastic climate changes that threatens the economy and living conditions on the planet. Currently, recovery and mitigation of these greenhouse gases remains a technological and scientific challenge. Various recovery processes for the mitigation of GHGs have been reported including among others carbon capture and storage (CCS). The most mature and applied technology in CCS process involves the absorption of carbon dioxide on amine based solvents. However, studies have shown that this process has several drawbacks that include low stability and high energy required to strip off the absorbed CO2 and regenerate the solvent. This presents an opportunity for the development of new materials for CO2 capture such as zeolite membranes. Previous studies have shown that the separation of CO2 can be achieved with high selectivity at low temperatures using thin-film SAPO-34 membranes (thin layers on supports). This is because CO2 adsorbs strongly on the membranes compared to other gases found in flue gas. In the thin-film membranes supported on ceramic or sintered stainless steel, thermal expansion mismatch may occur at higher operating temperatures resulting in loss of membrane selectivity due to the formation of cracks. A new method is required to overcome the aforementioned problems, thereby enhancing the separation application of the membranes at higher temperatures. The effective separation and capture of CO2 from the coal-fired power plant flue gas is an essential part in the CCS process (Figueroa et al., 2016; Yang et al., 2008). Currently, the capture stage is a huge contributor to the overall cost of CCS (Yang et al., 2008). This is due to the high-energy intensity and inefficient thermal processes applied in the separation and capture in various industrial applications (Yang et al., 2008). This work presents the use of nanocomposite SAPO-34 zeolite membranes synthesized via the pore-plugging hydrothermal method for the separation of CO2 during post-combustion CO2 capture. The SAPO-34 membranes used were supported on asymmetric α-alumina as membrane supports. The membranes were characterized with a combination of dynamic and static physicochemical techniques such as Basic Desorption Quality Test (BDQT), X-ray diffraction (XRD) spectroscopy, Scanning Electron Microscopy (SEM), Fourier Transform Infrared (FTIR) spectroscopy and thermogravimetric analysis (TGA). The characteristic peaks at 2θ = 21°, 26°, and 32° on the XRD pattern confirmed the presence of SAPO-34 with a rhombohedral crystalline structure. The SEM images showed the formation of the cubic crystalline which were consistent with the reported morphology of SAPO-34. FTIR spectra showed the presence of the essential double-6 membered rings (D6R) and TO4 structural groups in surface chemistry of crystalline materials further confirming the presence SAPO-34. The TGA confirmed that the membranes possessed high thermal stability. To assess the feasibility of the synthesis process, the nanocomposite zeolites were grown within the tubular supports. The SEM images of the cross-section of the membrane confirmed the presence of the zeolites within the pores of the support confirming the fabrication of nanocomposite membranes by the pore-plugging synthesis method. The permeation tests used a dead-end filtration mode to measure the single gas permeance and the ideal selectivity of CO2 and N2 were calculated. The BDQT was essential in the study of the quality of the as-synthesized nanocomposite membranes. The quality of the membranes increased with an increase in the synthesis layers of the membranes. However, with an increase in synthesis layers, the membrane thickness also increases. The membrane thickness affected the gas permeance for CO2 and N2 significantly. The permeance of the N2 gas decreased from 10.73 x10-7 mol.s-1.m2Pa-1 after the first synthesis to 0.31 x10-7 mol.s-1.m2Pa-1 after seven synthesis layers. Alternatively, the more adsorbing gas CO2 decreased from 12.85 x10-7 mol.s-1.m2Pa-1 to 2.44 x10-7 mol.s-1.m2Pa-1. The performance of these zeolite membranes depends significantly on the operating conditions. Hence, we studied extensively the influence of the various operating conditions such as temperature, feed pressure and feed flowrate in this work. Results indicated that the membrane separation performance in this study is largely dependent on the temperature. In addition, the ideal selectivity decreased significantly with an increase in temperature. High temperatures results in less adsorption of the highly adsorbing CO2 gas, the permeance reduces significantly, while the permeance of the less adsorbing N2 increased slightly. The feed flow rate has less effect on the adsorbing gas while the non-absorbing gas increased resulting in a decrease in the ideal selectivity as well. The nanocomposite membranes in this study have a low flux compared to their thin film counterparts. An increase in feed pressure significantly increased the flux significantly as well as the ideal selectivity. Maxwell-Stefan model simulation was done in this study to describe the permeance of pure CO2 single gas permeance as a function of temperature. This model considered explicitly the adsorption-diffusion mechanism, which is the transport phenomenon, involved in the transport of CO2 through the zeolite membrane. The description of the support material was included in the model as well. However, the model was only applied to the CO2 gas permeation well within the experimental data. We then compared the model was with the experimental results and a good correlation was observed. In conclusion, SAPO-34 nanocomposite zeolite membranes were obtained at low temperatures (150 °C) with a short synthesis time (6 h). In addition, the high thermal stability of the as-synthesized SAPO-34 membranes makes them ideal for high temperature CO2 separation such as the intended post-combustion carbon capture. The BDQT revealed that the quality of the membranes was related to the thickness of the membranes. Therefore, better membrane quality was obtained with relatively thicker membranes. The separation performance evaluation was conducted on the membrane with the greatest quality. Our findings demonstrate that the performance of the membranes depends extensively on the operating conditions.
MT2018
Capítulos de libros sobre el tema "Zeolite SAPO-34"
Hernández-Palomares, A., Y. Reyes-Vidal y F. Espejel-Ayala. "SAPO-34 Zeolite and Membranes for Biogas Purification". En Bio-Clean Energy Technologies: Volume 1, 181–208. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8090-8_8.
Texto completoBarthomeuf, Denise. "Generation of Acidity (Amount and Strength) in Silicoaluminophosphates (SAPO Zeolites). Examples of SAPO-5, -11, -34 and - 37". En Acidity and Basicity of Solids, 375–90. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0986-4_17.
Texto completoLi, Jinzhe, Yue Qi, Dazhi Zhang y Zhongmin Liu. "Propylene production by co-reaction of ethylene and chloromethane over SAPO-34". En From Zeolites to Porous MOF Materials - The 40th Anniversary of International Zeolite Conference, Proceedings of the 15th International Zeolite Conference, 1578–82. Elsevier, 2007. http://dx.doi.org/10.1016/s0167-2991(07)81033-0.
Texto completoZhao, G. L., J. W. Teng, Z. K. Xie, W. M. Yang, Q. L. Chen y Y. Tang. "Catalytic cracking reactions of C4-olefin over zeolites H-ZSM-5, H-mordenite and H-SAPO-34". En From Zeolites to Porous MOF Materials - The 40th Anniversary of International Zeolite Conference, Proceedings of the 15th International Zeolite Conference, 1307–12. Elsevier, 2007. http://dx.doi.org/10.1016/s0167-2991(07)80992-x.
Texto completoJiang, Y., J. Huang, W. Wang y M. Hunger. "Formation of methylamines by the reaction of ammonia with surface methoxy species on zeolite H-Y and the silicoaluminophosphate H-SAPO-34". En From Zeolites to Porous MOF Materials - The 40th Anniversary of International Zeolite Conference, Proceedings of the 15th International Zeolite Conference, 1331–37. Elsevier, 2007. http://dx.doi.org/10.1016/s0167-2991(07)80996-7.
Texto completoJiang, Y., J. Huang, J. Weitkamp y M. Hunger. "In situ MAS NMR and UV/VIS spectroscopic studies of hydrocarbon pool compounds and coke deposits formed in the methanol-to-olefin conversion on H-SAPO-34". En From Zeolites to Porous MOF Materials - The 40th Anniversary of International Zeolite Conference, Proceedings of the 15th International Zeolite Conference, 1137–44. Elsevier, 2007. http://dx.doi.org/10.1016/s0167-2991(07)80970-0.
Texto completoYu, Jong-Sung, Gern-Ho Back, Vadim Kurshev y Larry Kevan. "Electron spin resonance and electron spin echo modulation spectroscopic study of Pd(I) location and adsorbate interactions in PdH-SAPO-34 molecular sieve". En Zeolite Science 1994: Recent Progress and Discussions - Supplementary Materials to the 10th International Zeolite Conference, Garmish-Partenkirchen, Germany, July 17-22, 1994, 77–78. Elsevier, 1995. http://dx.doi.org/10.1016/s0167-2991(06)81094-3.
Texto completo"CHA SAPO-34 Al(47), P(32), Si(21)". En Verified Syntheses of Zeolitic Materials, 129–31. Elsevier, 2001. http://dx.doi.org/10.1016/b978-044450703-7/50134-4.
Texto completo"CHA SAPO-44 Al(48), P(34), Si(18)". En Verified Syntheses of Zeolitic Materials, 132–33. Elsevier, 2001. http://dx.doi.org/10.1016/b978-044450703-7/50135-6.
Texto completoIhm, S. K., S. W. Baek, Y. K. Park y K. C. Park. "24-P-26-The nature of medium acidity in [CuO/ZnO/ZrO2]SAPO-34 hybrid catalyst for CO2 hydrogenation: study of the interactions between metal oxides and acid sites in zeolite". En Studies in Surface Science and Catalysis, 277. Elsevier, 2001. http://dx.doi.org/10.1016/s0167-2991(01)81608-6.
Texto completoActas de conferencias sobre el tema "Zeolite SAPO-34"
Xiao, Wencan, Bo Zhang, Hao Xu, Song Xiao y Yanna Liu. "Influence of dual template on the synthesis of size controllable zeolite SAPO-34". En 2016 International Conference on Civil, Transportation and Environment. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/iccte-16.2016.181.
Texto completoYang, L., S. C. Zhang, Y. P. Feng, Z. T. Zhu, Y. B. Song y Y. W. Fang. "Synthesis of SAPO-34 Zeolite with Different Template Agents and DTO Catalytic Studies". En The International Workshop on Materials, Chemistry and Engineering. SCITEPRESS - Science and Technology Publications, 2018. http://dx.doi.org/10.5220/0007441305450551.
Texto completoYu, Lemeng, Qin Zhong y Shule Zhang. "Solvent-Free synthesis of Cu-SAPO-34 zeolite for NH3-SCR DeNOx with Cu-TEPA". En Annual International Conference on Sustainable Energy and Environmental Sciences. Global Science & technology Forum ( GSTF ), 2016. http://dx.doi.org/10.5176/2251-189x_sees16.41.
Texto completoMalone, Nathan, Sourav Chakravarty, Shiyu Zhang, Dorsa Talebi, Sri Vignesh Sankarraman, Erick Pool, Deokgeun Park et al. "Investigation of Mass Savings Potential of Zeolite Integrated Motor Thermal Management Systems in All-Electric Commercial Aircraft". En ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-96671.
Texto completoNg, Won Huei, Nor Naimah Rosyadah Ahmad, Choe Peng Leo y Abdul Latif Ahmad. "Polysulfone/SAPO-34 zeolite membrane impregnated with 1-ethyl-3-methyl imidazolium bis(tri-fluoromethylsulfonyl)imide ionic liquid for CO2 removal". En 6TH INTERNATIONAL CONFERENCE ON ENVIRONMENT (ICENV2018): Empowering Environment and Sustainable Engineering Nexus Through Green Technology. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5117126.
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