Готові списки джерел за темами / Catalyst for HAN decomposition

Добірка наукової літератури з теми "Catalyst for HAN decomposition"

Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Catalyst for HAN decomposition"

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Kim, Munjeong, Juyoung Kim, Young Min Jo, and Jong-Ki Jeon. "Decomposition of Hydroxylammonium Nitrate Solution Over Nanoporous CuO Supported on Honeycomb." Journal of Nanoscience and Nanotechnology 21, no. 8 (August 1, 2021): 4532–36. http://dx.doi.org/10.1166/jnn.2021.19438.

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We investigated the influence of a copper loading strategy over a honeycomb structure on the catalytic performance during the decomposition of a hydroxylammonium nitrate (HAN) aqueous solution. Copper was supported on the honeycomb surface by means of a metal coating method (MC), i.e., a method of directly coating a metal, and a metal alumina coating method (MAC), i.e., a method of coating a mixture of metal and alumina. The properties of the catalysts were analyzed by N2 adsorption, X-ray diffraction (XRD), and scanning electron microscopy (SEM). The Cu(16.8)/honeycomb-MC catalyst showed a lower decomposition onset temperature during the decomposition of the HAN aqueous solution compared to that over the Cu(7.0)/honeycomb- MAC catalyst, an outcome ascribed to the higher copper loading and the higher dispersion of copper in the Cu(16.8)/honeycomb-MC catalyst compared to that in the other catalyst. The Cu(16.8)/honeycomb-MC catalyst was confirmed to have both excellent activity and heat resistance during the decomposition of a HAN aqueous solution.
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Agnihotri, Ruchika, and Charlie Oommen. "Cerium oxide based active catalyst for hydroxylammonium nitrate (HAN) fueled monopropellant thrusters." RSC Advances 8, no. 40 (2018): 22293–302. http://dx.doi.org/10.1039/c8ra02368a.

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Yoo, Dalsan, Jaegyu Woo, Seolyeong Oh, and Jong-Ki Jeon. "Performance of Pt and Ir Supported on Mesoporous Materials for Decomposition of Hydroxylammonium Nitrate Solution." Journal of Nanoscience and Nanotechnology 20, no. 7 (July 1, 2020): 4461–65. http://dx.doi.org/10.1166/jnn.2020.17598.

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The catalytic decomposition of hydroxylammonium nitrate (HAN) was investigated using a series of platinum and iridium supported on mesoporous materials. In this study, MMZY, KIT-6, and SBA-15 were used as supports. The effects of the active metal and the pore structure of the catalysts on decomposition of HAN solution were studied. The activity of the platinum catalysts supported on mesoporous material is much superior to that of the iridium catalysts on the same support. The Pt(10)/SBA-15 catalyst showed excellent decomposition activity and was the best among the catalysts tested here, which seemed to be because of the pore structure of Pt(10)/SBA-15. Because the pore size of Pt(10)/SBA-15 is larger than that of Pt(10)/MMZY and Pt(10)/KIT-6, it is more advantageous for diffusion of reactant and product gas. The activity of the catalyst increased as the amount of Pt loaded on the SBA-15 support increased.
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Woo, Jaegyu, Dalsan Yoo, Seolyeong Oh, and Jong-Ki Jeon. "Decomposition of Energetic Ionic Liquid Over IrCu/Honeycomb Catalysts." Journal of Nanoscience and Nanotechnology 20, no. 11 (November 1, 2020): 7065–69. http://dx.doi.org/10.1166/jnn.2020.18841.

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The objective of this study is to elucidate the influence of a loading procedure of iridium and copper oxides over cordierite honeycomb support on catalytic performance during the decomposition of a hydroxylammonium nitrate (HAN) solution. Iridium and copper composite oxides were successfully supported on the cordierite honeycomb at the same time by repeating the wash coating process more than 2 times. Through the wash coating process, Cu and Ir were supported up to 43.4% and 4.9%, respectively. The cordierite honeycomb without active metal plays little role as a catalyst to lower the decomposition temperature. It was found that IrCu/honeycomb-2 catalyst, which was prepared by repeating the wash coating procedure twice, is an optimal catalyst for the decomposition of HAN solution. The IrCu/honeycomb-2 catalyst had the effect of lowering the decomposition onset temperature by 27.1°C compared to thermal decomposition.
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Agnihotri, Ruchika, and Charlie Oommen. "Evaluation of hydroxylammonium nitrate (HAN) decomposition using bifunctional catalyst for thruster application." Molecular Catalysis 486 (May 2020): 110851. http://dx.doi.org/10.1016/j.mcat.2020.110851.

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Bamufleh, Hisham S., and Sharif F. Zaman. "Ammonia Decomposition over Alkali Metal (Li, K, Cs)-Promoted Bulk Mo2N Catalyst." Processes 11, no. 8 (July 30, 2023): 2287. http://dx.doi.org/10.3390/pr11082287.

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Ammonia (NH3), which has a 17.7 wt% gravimetric hydrogen density, has been considered as a potential hydrogen storage material. This study looked at the thermocatalytic decomposition of NH3 using a bulk Mo2N catalyst that was boosted by alkali metals (AM: 5 wt% Li, K, Cs). The K-Mo2N catalyst outperformed all other catalysts in this experiment in terms of catalytic performance. At 6000 h−1 GHSV, 100% conversion of NH3 was accomplished using the K-Mo2N, Cs-Mo2N, and Mo2N catalysts. However, when compared to other catalysts, K-Mo2N had the highest activity, or 80% NH3 conversion, at a lower temperature, or 550 °C. The catalytic activity exhibited the following trend for the rate of hydrogen production per unit surface area: K-Mo2N > Cs-Mo2N > Li-Mo2N > Mo2N. Up to 20 h of testing the K-Mo2N catalyst at 600 °C revealed no considerable deactivation.
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Inoue, Masashi, Kouta Asai, Yoshiyuki Nagayasu, Koji Takane, and Eriko Yagasaki. "Synthesis of Carbon Nanotubes by the Catalytic Decomposition of Methane." Advances in Science and Technology 48 (October 2006): 67–72. http://dx.doi.org/10.4028/www.scientific.net/ast.48.67.

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The influence of morphology of the support particles upon the nickel-catalyzed decomposition of methane into carbon nanotubes and hydrogen was explored using a thermogravimetric apparatus. High carbon nanotube yield was attained by the Ni catalysts supported on the glycothermally synthesized ZrO2 and Er3Ga5O12 particles, which had spherical shapes. Quite high carbon yield was also obtained by the Ni catalyst supported on spherical Al2O3 particles (Nanophase Tech. Corp.). It was concluded that the most important factor governing the carbon yield is the morphology of the catalyst support, which contributes to the internal pressure of carbon nanotubes thus determining their chemical potentials.
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Liu, Lai Bao, Deng Liang He, and Dong Mei Zhao. "Study on Photocatalysis Degradation of Phenol by Using Tourmaline/ TiO2 System as Catalyst." Advanced Materials Research 399-401 (November 2011): 1337–41. http://dx.doi.org/10.4028/www.scientific.net/amr.399-401.1337.

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The authors use the method of titanium salts on the surface of tourmaline particles hydrolyzing and coating TiO2 to construct Tourmaline/ TiO2 system in different conditions and characterize the catalyst system by TEM and SEM and Raman Spectra Pattern. The writers used phenol solution as the target compound to observe the removing effects of catalysis system on phenol under dynamic conditions. The results showed that: a. the compound photo catalysis system had brilliant decomposition performance on phenol. b. It would reach high decomposition efficiency on the initial phase of reaction when the rate of tourmaline to TiO2 was 1:1 and the decomposition efficiency could be 96.29% at 120min when the rate was 0.2, which was 26% higher than that of pure phase TiO2.
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Villamarin-Barriga, Estefanía, Jéssica Canacuán, Pablo Londoño-Larrea, Hugo Solís, Andrés De La Rosa, Juan F. Saldarriaga, and Carolina Montero. "Catalytic Cracking of Heavy Crude Oil over Iron-Based Catalyst Obtained from Galvanic Industry Wastes." Catalysts 10, no. 7 (July 3, 2020): 736. http://dx.doi.org/10.3390/catal10070736.

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Sewage sludge from the galvanic industry represents a problem to the environment, due to its high metal content that makes it a hazardous waste and must be treated or disposed of properly. This study aimed to evaluate the sludge from three galvanic industries and determine its possible use as catalysts for the synthesis of materials. Catalyst was obtained from a thermal process based on dried between 100–120 °C and calcination of sludges between 400 to 700 °C. The physical–chemical properties of the catalyst were analyzed by several techniques as physisorption of N2 and chemisorption of CO of the material. Catalytic activity was analyzed by thermogravimetric analysis of a thermo-catalytic decomposition of crude oil. The best conditions for catalyst synthesis were calcination between 400 and 500 °C, the temperature of reduction between 750 and 850 °C for 15 min. The catalytic material had mainly Fe as active phase and the specific surface between 17.68–96.15 m2·g−1, the catalysts promote around 6% more weight-loss of crude oil in the thermal decomposition compared with assays without the catalyst. The results show that the residual sludge of galvanic industries after thermal treatment can be used as catalytic materials due to the easiness of synthesis procedures required, the low E-factor obtained and the recycling of industrial waste promoted.
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Shen, Bo Xiong, Ting Liu, Ning Zhao, Juan Ma, and Xiao Cui Hao. "Research of Catalytic Performance over Transition Metal Modified MnOx-CeOx/ACF Catalysts." Advanced Materials Research 383-390 (November 2011): 1945–50. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.1945.

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The catalyst of MnOx-CeOx/ACF prepared by impregnation method was used for low-temperature selective catalytic reduction (SCR) of NO with NH3, and more than 90% NO conversion was obtained at 230°C. Fe、Cu or V was used respectively to prepare transition metal modified MnOx-CeOx/ ACF catalysts which had lower catalytic activity than that over MnOx-CeOx/ACF. SEM, N2 adsorption and NH3-TPD were used to analyze the catalysts. The results showed that transition metal modified catalysts had a reduced surface area, pore volume and surface acidity. SO2 had a negative effect on SCR performance of the catalysts. Fe modified catalyst exhibited SO2 tolerance in the first 6h in the presence of 100ppm SO2. Thermal treatment in N2 at 350°C was used to regenerate the deactivated catalysts by SO2. The decomposition of ammonium salts recovered the catalytic activity to some extent. The sulfated active components in deactivated catalysts after the thermal treatment enhanced the surface acidity of the catalysts.
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Дисертації з теми "Catalyst for HAN decomposition"

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do, Nascimento Daniel Luis. "Olefin Metathesis Catalysts: From Decomposition to Redesign." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42541.

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Olefin metathesis is arguably the most versatile catalytic route yet developed for the assembly of carbon-carbon bonds. Metathesis methodologies are attractive from both synthetic and ecological standpoints, because they employ unactivated double bonds. This reduces the total number of synthetic steps, and the associated generation of chemical wastes. The drive to deploy olefin metathesis in highly demanding contexts, including pharmaceutical manufacturing and chemical biology, puts severe pressure on catalyst lifetime and productivity. Understanding the relevant decomposition pathways is critical to achieve essential performance goals, and to enable informed catalyst redesign. This thesis work expands on significant prior advances that identified and quantified critical decomposition pathways for ruthenium catalysts stabilized by N-heterocyclic carbene (NHC) ligands. Because pristine catalyst materials are essential for mechanistic study, it focuses first on methods aimed at improving efficiency and purity in catalyst synthesis. Merrifield iodide resins were shown to function as efficient, selective phosphine scavengers in the production of clean second-generation catalysts from PCy3- stabilized precursors. The thesis then turns to mechanistic examination of decomposition pathways that underlie success and failure for leading NHC catalysts, for comparison with a new family of catalysts stabilized by cyclic (alkyl)(amino) carbene (CAAC) ligands. These represent the first in-depth mechanistic studies of the CAAC catalysts, which have attracted much attention for their breakthrough productivities in challenging metathesis reactions. The remarkable productivity of the CAAC catalysts is shown to originate in their resistance to decomposition of the key metallacyclobutane intermediate via b-elimination, and (to a lesser extent) in their resistance to attack by nucleophiles and Bronsted bases. Importantly, however, they are more susceptible to bimolecular decomposition. The latter behaviour, as well as their resistance to b-elimination, is traced to the strong trans influence of the CAACs relative to NHC ligands. This insight significantly advances our understanding of the fundamental properties governing both productivity and decomposition. Finally, two new catalysts are developed, building on the principle that nucleophilic stabilizing ligands should be avoided in the precatalysts. In the first of these complexes, an o-dianiline ligand is employed to stabilize the precatalyst. This flexible, H-bonding chelate serves the further purpose of accelerating macrocyclization of flexible dienes that bear polar functionalities. As its H-bonding capacity also increases its sensitivity to trace water, however, an alternative catalyst architecture was pursued. The latter consists of a dimer bearing bulky Ru-indenylidene centers, in which a dative bond from a bridging chloride affords the fifth ligand essential to stabilize the precatalyst.
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Norooz, Oliaee Shirin. "Catalyst Development and the Structure-Dependent Properties for Hydrazine Decomposition." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1468618168.

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Malich, Ashley M. "Decomposition of Novel Diazosugars: Effects on Regioselectivity." Youngstown State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1222195006.

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Chai, Wai Siong. "Characterization & analysis on electrolytic decomposition of hydroxylammonium nitrate (HAN) ternary mixtures in microreactors." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/40544/.

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Rapid development of micropropulsion systems arose from growing interest on micro- and nanosatellites. Utilization of liquid energetic materials such as hydrazine and hydrogen peroxide as propellant in propulsion yielded promising results. However, safety issue remains a great concern as hydrazine is highly toxic. This drives the development of propellants towards lower toxicity and more environmental friendly, namely green propellants. Hydroxylammonium nitrate (HAN) was selected among three green propellants due to its high energy density in addition to ease in storage and handling properties. In order to understand the effect of addition of fuel into HAN binary solution, electrolytic decomposition of zero oxygen balance HAN ternary mixture in thermal isolated beaker was performed at macroscale. Addition of a fuel to binary HAN solution generally has more stages of decomposition, as opposed to single stage in binary HAN solution. Rate of temperature increase in the first stage of decomposition (Ṫ1) was found to be directly proportional to electrical resistivity of the HAN ternary mixture, while maximum electrolytic decomposition temperature (Tmax) of HAN ternary mixture obtained was dependent on fuel added. Visualization of HAN decomposition was demonstrated using transparent PDMS microreactors. A novel DPST integration in triggering the power supply and high speed camera was proposed. Such integration greatly reduced the cost of using a DAQ system, and was shown to capture the decomposition successfully at 5000 fps. Parametric optimization was also carried out in PDMS microreactors. Usage of 3 pairs of electrodes has increased overall reaction rate as high as 225 %, as compared to 1 pair counterpart. The overall reaction rate is proportional to flowrate and applied voltage. 3 pairs of electrodes can initiate decomposition in low voltage region. Applied voltage is the most significant parameter affecting the overall reaction rate. HAN-dextrose has lower decomposition performance compared to binary HAN solution in PDMS microreactor, using the optimized parameters carried out on binary HAN solution. This work has demonstrated both effect of fuel addition in binary HAN solution and parametric optimization in binary HAN solution towards their decomposition phenomena at macroscale and microscale,respectively. Several recommendations were made in future work section, including using screen-printing technology on the microreactor and adding a catalytic reactor after HAN was electrolyzed, to further improve decomposition efficiency.
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Bailey, Gwendolyn Anne. "Inside the Cycle: Understanding and Overcoming Decomposition of Key Intermediates in Olefin Metathesis." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37501.

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Ru-catalyzed olefin metathesis is an exceptionally powerful, versatile methodology for the assembly of carbon–carbon bonds. The N-heterocyclic carbene (NHC)-stabilized, “second-generation” Ru catalysts have enabled groundbreaking recent advances, ranging from the RCM assembly of cyclic peptides as hepatitis C virus therapeutics, to the elaboration of renewable seed oils and phenylpropanoids into value-added products and chemicals. However, key limitations arise from facile catalyst decomposition. Despite a plethora of studies on the synthesis of new catalysts, and on the decomposition processes accessible to the precatalyst and resting-state species, the underlying principles that govern decomposition of the active intermediates have been surprisingly little examined. One important reason for this is their incredible reactivity: the four-coordinate methylidene intermediate RuCl2(H2IMes)(=CH2) is too short-lived to be observed, while the metallacyclobutane (MCB) intermediate RuCl2(H2IMes)(2-C3H6) can only be observed below –40 °C. This makes them extremely challenging, but also fascinating targets for study. Understanding the underlying chemistry that dictates their reactivity and decomposition is essential for informed catalyst and process redesign, and is thus of fundamental interest, but also considerable practical importance. This thesis work thus aims at understanding the decomposition of active intermediates relevant to the highly-active, second-generation class of catalysts. Emphasis is placed on examining a variety of metathesis contexts, as well as providing solutions. Treated first are the decomposition pathways that arise during metathesis of electron-deficient olefins, a frontier area in organic synthesis, and in the utilization of renewable resources. An unexpected correlation is revealed between rapid catalyst decomposition, and the presence of a stabilizing PCy3 ligand in the standard catalyst for this reaction. The nucleophilic phosphine ligand is shown to attack an acrylate olefin, forming enolates that function as potent Brønsted bases. Literature evidence suggests that such strong bases are innocuous towards the precatalyst, pointing towards a key role for the active intermediates in Brønsted base-induced catalyst decomposition. Precisely which intermediate is involved, as well as the site of deprotonation, is elucidated next. Prior to this work, the NHC ligand was widely believed to be the target for attack. However, through labelling experiments, analysis of the Ru and organic byproducts, and computational studies, deprotonation is shown to occur at the MCB ring. Moreover, MCB deprotonation is revealed to be unexpectedly general, and not contingent on the presence of either an exceptionally strong base, or an electron-deficient substrate. This understanding is key, given recent reports from pharma highlighting the adverse impact of base contaminants, as well as current interest in metathesis of amine-containing substrates. Next examined are the intrinsic decomposition pathways operative for the MCB and four-coordinate methylidene. Prior to this work, the only reported pathway for decomposition of these two species involved beta-elimination of the MCB ring as propene. However, beta-elimination is shown to play an unexpectedly minor role in catalyst decomposition: less than 40% propenes are observed, even under conditions expected to favour MCB elimination. Bimolecular coupling of the methylidene, with loss of the methylidene moiety as ethylene, is proposed to account for the difference. Thus, transiently-stabilized adducts RuCl2(H2IMes)(=CH2)(L)n (L = o-dianiline or pyridine) are synthesized at temperatures down to –120 °C. On warming, these adducts lose Ln and rapidly decompose via bimolecular coupling, with loss of the methylidene moiety as ethylene. These experiments provide the first unambiguous evidence for bimolecular coupling in the important "second-generation" Ru systems, nearly two decades after which this pathway was dismissed in leading papers and reviews. The last two sections focus on solutions. First, a powerful, straightforward solution to the “enolate problem” is developed, whereby the acrylate enolates are quenched and sequestered via reaction with a polyphenol resin. Then, methods for preventing catalyst decomposition during matrix-assisted laser desorption / ionization mass spectrometry (MALDI-MS) are developed, via elucidation of the instrumental and experimental factors that promote successful analysis. As one of the only MS methods capable of affording insight into neutral metal complexes and catalysts, MALDI has unique potential to enable routine analysis of catalyst speciation and decomposition in situ, under real catalytic conditions, for a wide range of catalytic reactions. Collectively, the findings in this thesis offer a much more complete understanding of the fundamental pathways accessible to the important, highly-active metathesis intermediates, and offer strategies likely to inform practice in both academic and industrial settings. This understanding is key to harnessing the full potential of metathesis methodologies.
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Rico, Pérez Verónica. "Optimization of N2O decomposition RhOx/ceria catalysts and design of a high N2-selective deNOx system for diesel vehicles." Doctoral thesis, Universidad de Alicante, 2013. http://hdl.handle.net/10045/35739.

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Okura, Kaname. "Studies on Ammonia Decomposition for Hydrogen Production over Ni Catalysts." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225614.

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Harada(Onishi), Chie. "Direct Decomposition of Nitrous Oxide over Alkali-doped Co3O4 Catalyst in the Presence of Oxygen." 京都大学 (Kyoto University), 2009. http://hdl.handle.net/2433/124545.

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Petty, Renee Lynn. "Catalytic Decomposition of Nitric Oxide and Carbon Monoxide Gases Using Nanofiber Based Filter Media of Varying Diameters." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1279505229.

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Ireland, Benjamin. "Amines in Olefin Metathesis: Ligands and Poisons." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34342.

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Olefin metathesis is a powerful tool for assembly of carbon-carbon bonds. Amines and related N-donors are problematic functional groups in Ru-catalyzed olefin metathesis - a well- documented, but poorly understood problem. The first part of this thesis focuses on amine-induced deactivation pathways; two of which are described in depth. Alkylidene abstraction, a previously unknown reaction for nitrogen nucleophiles, was observed for smaller and less Bronsted-basic amines. Deprotonation of the metallacyclobutane intermediate formed during catalysis is prominent for highly Bronsted basic or sterically bulky N-donors. Monosubstituted (and, by extension unsubstituted) metallacyclobutanes are particularly vulnerable to deprotonation. For each pathway, the fate of the alkylidene Ru=CHR functional group proved key in determining the nature of deactivation. Both pathways have been detected during catalysis, as evidenced by formation of diagnostic amine (RCH2NR2’) or substituted propene products. A combination of quantitative NMR and GC-MS analysis was used to identify these species on loss of the Ru-alkylidene functional group. The second part of this thesis focuses on incorporating amines into catalyst design – an under-utilized strategy in the context of Ru-catalyzed olefin metathesis. A modified Grubbs-type catalyst was developed featuring a bulky, relatively non-basic biaryldiamine ligand. Metathesis activity for this catalyst was comparable, and in some cases superior to the most widely-used homogeneous catalysts currently available. Several new, related Ru-benzylidenes were also prepared and fully characterized in conjunction with the mechanistic studies described above. Progress toward development of N-anion-containing metathesis catalysts is also discussed. Synthesis of Ru-hydride complexes originally intended for this purpose allowed for a fundamental study of the coordination chemistry and reductive elimination chemistry of the NPh2– anion.
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Частини книг з теми "Catalyst for HAN decomposition"

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van Leeuwen, Piet W. N. M. "Catalyst preparation and decomposition." In Rhodium Catalyzed Hydroformylation, 233–51. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/0-306-46947-2_9.

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Fujitani, Tadahiro, and Isao Nakamura. "Ruthenium Catalyst for Ammonia Decomposition." In CO2 Free Ammonia as an Energy Carrier, 375–89. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-4767-4_24.

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Koestner, R. J., E. B. Kollin, J. Stöhr, and J. L. Gland. "Molecular Adsorption and Decomposition on Clean and Sulfur-Modified Metal Surfaces." In Catalyst Characterization Science, 199–209. Washington, DC: American Chemical Society, 1985. http://dx.doi.org/10.1021/bk-1985-0288.ch018.

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Schrodi, Yann. "Mechanisms of Olefin Metathesis Catalyst Decomposition and Methods of Catalyst Reactivation." In Handbook of Metathesis, 323–42. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527674107.ch11.

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Joshi, Amit, K. K. S. Mer, Shantanu Bhattacharya, and Vinay K. Patel. "Nano-aluminium as Catalyst in Thermal Decomposition of Energetic Materials." In Energy, Environment, and Sustainability, 109–20. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-3269-2_5.

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Pinzón, M., A. Sánchez-Sánchez, P. Sánchez, A. R. de la Osa, and A. Romero. "Perovskites as Catalyst Precursor for Hydrogen Production from Ammonia Decomposition." In Metal-Halide Perovskite Semiconductors, 221–38. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-26892-2_11.

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Mansurov, Zulkhair A., Rachid Amrousse, Keiichi Hori, and Meiram K. Atamanov. "Combustion/Decomposition Behavior of HAN Under the Effects of Nanoporous Activated Carbon." In Innovative Energetic Materials: Properties, Combustion Performance and Application, 211–30. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4831-4_8.

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Petkovic, Lucia M., Daniel M. Ginosar, Kyle C. Burch, and Harry W. Rollins. "Direct Decomposition of Methane to Hydrogen on Metal-Loaded Zeolite Catalyst." In ACS Symposium Series, 105–17. Washington, DC: American Chemical Society, 2007. http://dx.doi.org/10.1021/bk-2007-0959.ch009.

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Oda, Tetsuji, Hikaru Kuramochi, and Ryo Ono. "Non-thermal Plasma Processing for Dilute VOCs Decomposition Combined with the Catalyst." In Electrostatic Precipitation, 638–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89251-9_132.

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Jurng, Jongsoo, Sungmin Chin, and Eunseuk Park. "A Study on TiO2 Nanoparticle-Supported Mn2O3 Catalyst for Indoor Air Pollutants - Ozone and VOC Decomposition Reaction." In Springer Proceedings in Physics, 29–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-17913-6_4.

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Тези доповідей конференцій з теми "Catalyst for HAN decomposition"

1

Courthéoux, Laurence, Sylvie Rossignol, Charles Kappenstein, and Nicolas Pillet. "Improvement of Catalysts for the Decomposition of HAN-Based Monopropellant - Comparison Between Aerogels and Xerogels." In 39th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2003. http://dx.doi.org/10.2514/6.2003-4645.

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Miadzvetski, A. V., N. A. Savastenko, S. A. Maskevich, I. I. Filatova, M. T. Gabdullin, T. S. Ramasanov, Kh A. Abdullin, and Zh K. Kalkozova. "PHOTODEGRADATION OF ORGANIC POLLUTANTS IN WATER BY TiO2-BASED PHOTOCATALYSTS." In SAKHAROV READINGS 2022: ENVIRONMENTAL PROBLEMS OF THE XXI CENTURY. International Sakharov Environmental Institute of Belarusian State University, 2022. http://dx.doi.org/10.46646/sakh-2022-2-308-311.

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It has been studied the kinetics of photocatalytic decomposition of organic pollutants in water using TiO2-based photocatalysts. The photodegradation of Methyl Orange (MO) under UV light was chosen as the model reaction for the study of the catalysts performance. Anatase and rutile TiO2 were synthesized using hydrothermal method. The rate constant of photodegradation was used to express the catalytic reactivity of the catalyst. The synthesized catalysts were characterized by scanning electron microscopy (SEM), Raman spectroscopy and X-ray diffraction analysis (XRD).
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Wong, Bunsen, Dennis Thomey, Lloyd Brown, Martin Roeb, Robert Buckingham, and Christian Sattler. "Sulfur Based Thermochemical Energy Storage for Concentrated Solar Power." In ASME 2013 7th International Conference on Energy Sustainability collocated with the ASME 2013 Heat Transfer Summer Conference and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/es2013-18283.

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A sulfur based thermochemical energy storage cycle for baseload power generation is being developed under the support of US DOE Sunshot program. Solar heat is stored in elemental sulfur via thermal decomposition of sulfuric acid and disproportionation of sulfur dioxide into elemental sulfur and sulfuric acid. Heat energy is recovered upon sulfur combustion. On-sun decomposition of sulfuric acid in a solar furnace has been demonstrated between 650 and 850°C. Near equilibrium conversion was obtained at high temperature but conversion was reduced due to catalyst poisoning at the lower temperatures. Sulfur dioxide disproportionation modeling showed the reaction driving force is maximized at the high system pressure and low system temperature. The effect of system pressure was validated experimentally. However, the disproportionation rate was found to increase with system temperature as a result of increased reaction kinetics. Homogenous iodide catalysts were used to further enhance the degree of disproportionation and the reaction rate. The process steps required to recover the catalyst for reuse have been verified.
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Vakhin, Alexey V., Irek I. Mukhamatdinov, Firdavs A. Aliev, Dmitriy F. Feoktistov, Sergey A. Sitnov, Marat R. Gafurov, Ilgiz F. Minkhanov, et al. "Industrial Application of Nickel Tallate Catalyst During Cyclic Steam Stimulation in Boca De Jaruco Reservoir." In SPE Russian Petroleum Technology Conference. SPE, 2021. http://dx.doi.org/10.2118/206419-ms.

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Abstract A nickel-based catalyst precursor has been synthesized for in-situ upgrading of heavy crude oil that is capable of increasing the efficiency of steam stimulation techniques. The precursor activation occurs due to the decomposition of nickel tallate under hydrothermal conditions. The aim of this study is to analyze the efficiency of in-situ catalytic upgrading of heavy oil from laboratory scale experiments to the field-scale implementation in Boca de Jaruco reservoir. The proposed catalytic composition for in-reservoir chemical transformation of heavy oil and natural bitumen is composed of oil-soluble nickel compound and organic hydrogen donor solvent. The nickel-based catalytic composition in laboratory-scale hydrothermal conditions at 300°С and 90 bars demonstrated a high performance; the content of asphaltenes was reduced from 22% to 7 wt.%. The viscosity of crude oil was also reduced by three times. The technology for industrial-scale production of catalyst precursor was designed and the first pilot batch with a mass of 12 ton was achieved. A «Cyclic steam stimulation» technology was modified in order to deliver the catalytic composition to the pay zones of Boca de Jaruco reservoir (Cuba). The active forms of catalyst precursors are nanodispersed mixed oxides and sulfides of nickel. The pilot test of catalyst injection was carried out in bituminous carbonate formation M, in Boca de Jaruco reservoir (Cuba). The application of catalytic composition provided increase in cumulative oil production and incremental oil recovery in contrast to the previous cycle (without catalyst) is 170% up to date (the effect is in progress). After injection of catalysts, more than 200 samples from production well were analyzed in laboratory. Based on the physical and chemical properties of investigated samples and considering the excellent oil recovery coefficient it is decided to expand the industrial application of catalysts in the given reservoir. The project is scheduled on the fourth quarter of 2021.
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Lee, Dae Hoon, Sejin Kwon, Jin Soo Hwang, and Sang-Eon Park. "Thermochemical Design of a Micro Liquid Monopropellant Rocket With Catalytic Reaction of Hydrogen Peroxide." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39193.

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A theoretical and experimental investigation on a design of catalytic reactor of submilimeter scale to be used as a micro propulsion device is described. A micro reactor was fabricated on an aluminum plate and catalyst was prepared on the anodized internal surface of the reactor. The reactor has a height of 1mm and width of 10mm. The height of the reactor is the major constraint when a prototype device is to be fabricated on a wafer by MEMS processing. Thermodynamic properties of product gases from the decomposition process of hydrogen peroxide in contact with perovskite based redox cycling catalyst were measured. A theoretical model was developed to predict the heat and gaseous mass generated from the decomposition process of hydrogen peroxide by using asymptotic approximation of reacting flow in 1-D channel with height of 1mm or less in order to approximate the actual operating condition of propulsion device on a chip. The measured heat transfer coefficients and thermodynamic properties were used in the calculation. As the monopropellant decomposes into water and oxygen, the reaction products are heated. The enhanced heat loss due to the small size of the chamber, however, adversely affected the thermochemical process of decomposition.
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Klinghoffer, Naomi, and Marco J. Castaldi. "Deactivation and Energy Analysis of Char Catalysts in Biomass Gasification Systems." In 20th Annual North American Waste-to-Energy Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/nawtec20-7036.

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One of the major barriers to gasification is the need for elimination of tars that are generated in thermochemical conversion processes. While metal catalysts can be used for tar decomposition, and cheaper alternative is char. Deactivation of char catalysts has been studied and these deactivation rates have been applied to a model for a gasification system. The calculations and experimental data presented here show that if the char from a gasifier is recycled to a tar reformer then some char deactivation will take place, but the activity will not fall below 40% of its initial activity. The energy penalty for diverting char, a potential heat source, to a catalytic reactor has been accounted for. This was done by comparing the heating value of char to the heating value of syngas generated from reforming tar using the char as a catalyst. At high gasification temperatures, when tar production in the gasifier was low, the char had a higher heating value than the syngas that was produced from tar reforming. At low temperatures, the heating value of the syngas exceeded that of the char combustion, which implies an overall energy benefit.
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Ozalp, Nesrin, and Vidyasagar Shilapuram. "Characterization of Activated Carbon for Carbon Laden Flows in a Solar Reactor." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44381.

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Carbon is not only a major product of the methane decomposition but also a catalyst for the heterogeneous methane decomposition reaction. It is highly desirable that the morphology and surface properties of the product carbon be controlled to maximize their catalytic effects. In this paper, we characterize the physical properties of two activated carbon samples by sizes, and crystallographic structures using scanning electron microscope, x-ray diffraction, particle size analyzer, and surface area measurement. The paper also includes high temperature thermogravimetric experiment results on the carbon–hydrogen reaction to show if the injected carbon particles reacts with the formed hydrogen, which has not been studied in solar thermal hydrocarbon decomposition before. Results show that carbon does not react with hydrogen to form methane or any other intermediate compounds up until 900°C, which explains the favorable effect of carbon laden flow experiments for catalytic methane decomposition at lower temperatures. These results will be used to identify the optimal operating conditions for our solar reactor.
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Chen, Xingjian, Guangwu Tang, Bin Wu, Chenn Q. Zhou, and Christopher P. Colella. "Optimization of an Urea Decomposition Chamber Using CFD and VR." In ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ht2013-17514.

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Selective Catalytic Reduction (SCR) is an important air pollution control process that consists of injecting ammonia (NH3) into the boiler flue gas and passing the flue gas through a catalyst bed where the NOx and NH3 react to form nitrogen gas (N2) and water vapor (H2O). [1] At a coal-fired power station, a decomposition chamber uses combustion air and a natural gas burner to provide the necessary temperature, air flow and pressure to convert the injected urea solution into ammonia gas. The inspections of this decomposition chamber indicate debris formations occurring at the burner/roof block the chamber from achieving proper temperature for conversion and redirect the burner flame/flow, which can potentially shift the flow pattern in the chamber. In order to identify the cause of this debris formation, Computational Fluid Dynamics (CFD) and Virtual reality fVR have been employed to simulate and visualize the flow distribution and species concentration inside this decomposition chamber. By analyzing the simulation data, excessive ammonia recirculation had been identified as the cause of the debris formation at the top of the chamber. Parametric studies have also been conducted to optimize the existing chamber design by introducing multiple turning vanes to eliminate the excessive recirculation, thus minimizing debris formation.
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Maruyama, Shigeo, and Rong Xiang. "CVD Growth, Optical and Thermal Characterization of Vertically-Aligned Single-Walled Carbon Nanotubes." In ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASMEDC, 2009. http://dx.doi.org/10.1115/mnhmt2009-18552.

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Vertically aligned single-walled carbon nanotubes (VA-SWNTs) is expected to be an extra-ordinal material for various optical, electrical, energy, and thermal devices. The recent progress in growth control and characterization techniques will be discussed. The CVD growth mechanism of VA-SWNTs is discussed based on the in-situ growth monitoring by laser absorption during CVD. The growth curves are characterized by an exponential decay of the growth rate from the initial rate determined by ethanol pressure. The initial growth rate and decay of it are discussed with carbon over-coat on metal catalysts and gas phase thermal decomposition of precursor ethanol. For the precisely patterned growth of SWNTs, we recently propose a surface-energy-difference driven selective deposition of catalyst for localized growth of SWNTs. For a self assembled monolayer (SAM) patterned Si surface, catalyst particles deposit and SWNTs grow only on the hydrophilic regions. The proposed all-liquid-based approach possesses significant advantages in scalability and resolution over state-to-the-art techniques, which we believe can greatly advance the fabrication of nano-devices using high-quality as-grown SWNTs. The optical characterization of the VA-SWNT film using polarized absorption, polarized Raman, and photoluminescence spectroscopy will be discussed. Laser-excitation of a vertically aligned film from top means that each nanotube is excited perpendicular to its axis. Because of this predominant perpendicular excitation, interesting cross-polarized absorption and confusing and practically important Raman features are observed. The extremely high and peculiar thermal conductivity of single-walled carbon nanotubes has been explored by non-equilibrium molecular dynamics simulation approaches. The thermal properties of the vertically aligned film and composite materials are studied by several experimental techniques and Monte Carlo simulations based on molecular dynamics inputs of thermal conductivity and thermal boundary resistance. Current understanding of thermal properties of the film is discussed.
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Coetzee, M. D., and P. W. E. Blom. "Proposed Concept Design for the High Temperature Sulphuric Acid Decomposition Reactor Applicable to the Hybrid Sulphur (HyS) Process." In Fourth International Topical Meeting on High Temperature Reactor Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/htr2008-58022.

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The utilization of alternate sources of energy is becoming more important due to the constantly growing world-wide demand for energy. The production of hydrogen via the Hybrid Sulphur process is a possible alternative that may contribute to alleviating the pressure on energy resources. The current field of interest is to investigate the operation of the sulphuric acid decomposition reactor operating at pressure ranges between 8 and 9 MPa. The reduction of SO3 to SO2 is, however, favoured at low pressures while maintaining high operating temperatures. Considering this, the need to investigate the possibility of operating at lower operating pressures is important in striving for higher process efficiencies. The proposed decomposition reactor is a multi-stage reactor system operated adiabatically with inter-stage heating in order to simplify the reactor design and improve the over-all conversion and efficiency of the process. At a pressure of 8–9 MPa and temperature of 900°C, the maximum conversion of SO3 to SO2 that can be achieved is between 48% and 54%. The proposed multi-stage reactor system has 5 packed bed (catalyst) reactor stages with 4 intermediate heat exchangers, and by lowering the operating pressure to 3 kPa, a maximum conversion of 72% could be achieved. The viability of the HyS process mainly depends on the performance of the SO3 decomposition reactor.
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Звіти організацій з теми "Catalyst for HAN decomposition"

1

Ates Akyurtlu and Jale F. Akyurtlu. Development of a Novel Catalyst for No Decomposition. Office of Scientific and Technical Information (OSTI), March 2007. http://dx.doi.org/10.2172/908813.

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Ates Akyurtlu and Jale F. Akyurtlu. Development Of A Novel Catalyst For No Decomposition. Office of Scientific and Technical Information (OSTI), September 2006. http://dx.doi.org/10.2172/896871.

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Ates Akyurtlu and Jale F Akyurtlu. DEVELOPMENT OF A NOVEL CATALYST FOR NO DECOMPOSITION. Office of Scientific and Technical Information (OSTI), March 2005. http://dx.doi.org/10.2172/882007.

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Ates Akyurtlu and Jale F. Akyurtlu. DEVELOPMENT OF A NOVEL CATALYST FOR NO DECOMPOSITION. Office of Scientific and Technical Information (OSTI), September 2005. http://dx.doi.org/10.2172/882492.

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Ates Akyurtlu and Jale F. Akyurtlu. DEVELOPMENT OF A NOVEL CATALYST FOR NO DECOMPOSITION. Office of Scientific and Technical Information (OSTI), October 2004. http://dx.doi.org/10.2172/835237.

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Ates Akyurtlu and Jale Akyurtlu. Development of a Novel Catalyst for No Decomposition. Office of Scientific and Technical Information (OSTI), June 2007. http://dx.doi.org/10.2172/969139.

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Ates Akyurtlu and Jale F. Akyurtlu. DEVELOPMENT OF A NOVEL CATALYST FOR NO DECOMPOSITION. Office of Scientific and Technical Information (OSTI), May 2004. http://dx.doi.org/10.2172/825388.

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Ates Akyurtlu and Jale F. Akyurtlu. DEVELOPMENT OF A NOVEL CATALYST FOR NO DECOMPOSITION. Office of Scientific and Technical Information (OSTI), June 2005. http://dx.doi.org/10.2172/841398.

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Walker, D. D. Effects of oxygen and catalyst on tetraphenylborate decomposition rate. Office of Scientific and Technical Information (OSTI), December 1999. http://dx.doi.org/10.2172/750108.

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Wilmarth, W. R., C. L. Crawford, and R. A. Peterson. Decomposition studies of filtered slurries using the enhanced comprehensive catalyst. Office of Scientific and Technical Information (OSTI), November 1997. http://dx.doi.org/10.2172/568425.

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