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Letteratura scientifica selezionata sul tema "Catalysts"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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Articoli di riviste sul tema "Catalysts"

1

Dagorne, Samuel. "Recent Developments on N-Heterocyclic Carbene Supported Zinc Complexes: Synthesis and Use in Catalysis." Synthesis 50, no. 18 (2018): 3662–70. http://dx.doi.org/10.1055/s-0037-1610088.

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The present contribution reviews the synthesis, reactivity, and use in catalysis of NHC–Zn complexes reported since 2013. NHC-stabilized Zn(II) species typically display enhanced stability relative to common organozinc species (such as Zn dialkyls), a feature of interest for the mediation of various chemical processes and the stabilization of reactive Zn-based species. Their use in catalysis is essentially dominated by reduction reactions of various unsaturated small molecules (including CO2), thus primarily involving Zn–H and Zn–alkyl derivatives as catalysts. Simple NHC adducts of Zn(II) dih

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2

Crawford, Jennifer, and Matthew Sigman. "Conformational Dynamics in Asymmetric Catalysis: Is Catalyst Flexibility a Design Element?" Synthesis 51, no. 05 (2019): 1021–36. http://dx.doi.org/10.1055/s-0037-1611636.

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Traditionally, highly selective low molecular weight catalysts have been designed to contain rigidifying structural elements. As a result, many proposed stereochemical models rely on steric repulsion for explaining the observed selectivity. Recently, as is the case for enzymatic systems, it has become apparent that some flexibility can be beneficial for imparting selectivity. Dynamic catalysts can reorganize to maximize attractive non-covalent interactions that stabilize the favored diastereomeric transition state, while minimizing repulsive non-covalent interactions for enhanced selectivity.

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3

Kaplunenko, Volodymyr, and Mykola Kosinov. "Electric field - induced catalysis. Laws of field catalysis." InterConf, no. 26(129) (October 18, 2022): 332–51. http://dx.doi.org/10.51582/interconf.19-20.10.2022.037.

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Abstract.The article explores a new type of catalysis - electric field catalysis. The laws of field catalysis are given. The characteristics of the electric field are determined, which set the values of the characteristics of the field catalysis. Field catalysis and field catalyst do not fit into the traditional definition of catalysis and catalyst, which may require a revision of the terminology of catalysis. The field is a more versatile catalyst compared to material catalysts, both in terms of its application to a wider range of chemical reactions, and in the ability to control the rate and

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4

Newman, R. A., J. A. Blazy, T. G. Fawcett, L. F. Whiting, and R. A. Stowe. "Use of the Dow-Developed DSC/XRD/MS in the Study of Several Model Copper-Based Catalyst Systems." Advances in X-ray Analysis 30 (1986): 493–502. http://dx.doi.org/10.1154/s0376030800021650.

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Due to the difficulty of analyzing materials at high temperatures and in reactive atmospheres, solid-state catalysts have often been developed with little knowledge of the true chemical behavior of the catalyst, except on a bulk scale. In the field of solid-state catalysis research, a great deal of time and effort is presently being spent to better characterize the chemical and physical properties which determine a particular catalyst‘s efficiency, lifetime, and selectivity. Recently, we have undertaken a study of model copper catalysts at The Dow Chemical Company in an effort to better unders

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5

Lomic, Gizela, Erne Kis, Goran Boskovic, and Radmila Marinkovic-Neducin. "Application of scanning electron microscopy in catalysis." Acta Periodica Technologica, no. 35 (2004): 67–77. http://dx.doi.org/10.2298/apt0435067l.

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A short survey of various information obtained by scanning electron microscopy (SEM) in the investigation of heterogeneous catalysts and nano-structured materials have been presented. The capabilities of SEM analysis and its application in testing catalysts in different fields of heterogeneous catalysis are illustrated. The results encompass the proper way of catalyst preparation, the mechanism of catalyst active sites formation catalysts changes and catalyst degradation during their application in different chemical processes. Presented SEM pictures have been taken on a SEM JOEL ISM 35 over 2

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6

Liu, Jingyue. "Advanced Electron Microscopy Characterization of Nanostructured Heterogeneous Catalysts." Microscopy and Microanalysis 10, no. 1 (2004): 55–76. http://dx.doi.org/10.1017/s1431927604040310.

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Heterogeneous catalysis is one of the oldest nanosciences. Although model catalysts can be designed, synthesized, and, to a certain degree, characterized, industrial heterogeneous catalysts are often chemically and physically complex systems that have been developed through many years of catalytic art, technology, and science. The preparation of commercial catalysts is generally not well controlled and is often based on accumulated experiences. Catalyst characterization is thus critical to developing new catalysts with better activity, selectivity, and/or stability. Advanced electron microscop

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7

Guerrero Fajardo, Carlos Alberto, Yvonne N’Guyen, Claire Courson, and Anne Cécile Roger. "Fe/SiO2 catalysts for the selective oxidation of methane to formaldehyde." Ingeniería e Investigación 26, no. 2 (2006): 37–44. http://dx.doi.org/10.15446/ing.investig.v26n2.14735.

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Selective oxidation of methane to formaldehyde was analysed with iron catalysts supported on silica prepared by the sol-gel method, leading to obtaining a large support surface area facilitating high dispersion of iron on silica’s amorphous surface. Seven catalysts were prepared; one of them corresponded to the silica support and another five having an iron load 0.1-0.5% in weight. Catalyst 7 (0.5% Fe in weight) was prepared with neutral pH control and had the most homogeneous characteristics since it did not present isolated iron species, corroborated by SEM and TEM analysis. The highest BET

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8

Trigoura, Leslie, Yalan Xing, and Bhanu P. S. Chauhan. "Recyclable Catalysts for Alkyne Functionalization." Molecules 26, no. 12 (2021): 3525. http://dx.doi.org/10.3390/molecules26123525.

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In this review, we present an assessment of recent advances in alkyne functionalization reactions, classified according to different classes of recyclable catalysts. In this work, we have incorporated and reviewed the activity and selectivity of recyclable catalytic systems such as polysiloxane-encapsulated novel metal nanoparticle-based catalysts, silica–copper-supported nanocatalysts, graphitic carbon-supported nanocatalysts, metal organic framework (MOF) catalysts, porous organic framework (POP) catalysts, bio-material-supported catalysts, and metal/solvent free recyclable catalysts. In add

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9

Gai, P. L., K. Kourtakis, H. Dindi, and S. Ziemecki. "Novel Xerogel Catalyst Materials for Hydrogenation Reactions and the Role of Atomic Scale Interfaces." Microscopy and Microanalysis 5, S2 (1999): 704–5. http://dx.doi.org/10.1017/s1431927600016846.

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We are developing a new family of heterogeneous catalysts for hydrogenation catalysis. Catalyst synthesis is accomplished using colloidal polymerization chemistry which produce high surface area xerogel catalysts. These xerogels have been synthesized by one-step sol gel chemistry. These catalysts contain ruthenium and modifiers such as gold occluded or incorporated in a titanium oxide matrix. The materials, especially the modified systems exhibit favorable performance in microreactor evaluations for hydrogenation reactions and exhibit high activities. Nanostructural studies have revealed that

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10

Yap, Daryl Q. J., Raju Cheerlavancha, Renecia Lowe, Siyao Wang, and Luke Hunter. "Investigation of cis- and trans-4-Fluoroprolines as Enantioselective Catalysts in a Variety of Organic Transformations." Australian Journal of Chemistry 68, no. 1 (2015): 44. http://dx.doi.org/10.1071/ch14129.

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Stereoselective fluorination is known to rigidify the ring structure of l-proline, as a result of a combination of electrostatic and hyperconjugative effects associated with the C–F bond. This is a potential strategy for enhancing the enantioselectivity of proline-catalysed reactions. In this study, cis- and trans-4-fluoroprolines were investigated as catalysts in five different organic transformations, including examples of both enamine and iminium ion catalysis. Some significant differences in enantioselectivity were observed between the cis- and trans-isomers of the fluorinated catalysts, c

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Più fonti

Tesi sul tema "Catalysts"

1

Beckler, Robert Kendall. "Polynuclear metal complexes as model mixed oxide catalysts." Diss., Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/11897.

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2

Liu, Hongying. "Syntheses, structures, and catalysis of polynuclear metal complexes." Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/30561.

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3

Paliga, James Francis. "Developing Earth-abundant metal-catalysts for hydrofunctionalisation." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31115.

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The iron-catalysed hydromagnesiation of styrene derivatives has been developed further from previous publications, expanding the electrophile scope to enable the regioselective formation of new carbon-carbon and carbon-heteroatom bonds (Scheme A1). A commercially available pre-catalyst and ligand were used to give an operationally simple procedure that did not require prior synthesis of a catalyst. This work also investigated the hydromagnesiation of dienes, using a screen of ligands commonly used in transition metal catalysis. An investigation into the magnesium-catalysed hydroboration of ole

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4

Clarke, Richard John. "Mesopore immobilised bis(oxazoline) catalysts for enantioselective catalysis." Thesis, University of Birmingham, 2003. http://etheses.bham.ac.uk//id/eprint/3578/.

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Mesoporous silica materials have the potential to replace many conventional silicas for uses such as supports for heterogeneous catalysis and absorbents. The large pore size and high surface area make them ideal for supporting bulky organometallic catalysts for enantioselective reactions. We have immobilised chiral bis(oxazoline) metal complexes onto the surfaces of some of these versatile supports (MCM-41 and MCM-48) via different tethering strategies. The resulting heterogeneous catalysts were shown to be highly active in the enantioselective cyclopropanation of styrene with ethyl diazoaceta

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5

Rosenthal, Daniel Jay. "Estimating the acid site density of silica-alumina by infrared spectroscopy using a selective reactant poison." Thesis, Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/10222.

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6

Trant, Aoife Geraldine. "Structural and catalytic studies of novel Au/Ni enantioselective catalysts." Thesis, St Andrews, 2008. http://hdl.handle.net/10023/854.

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7

Reddy, P. K. "Exploration of catalysts and catalysis under near working conditions." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2018. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/4577.

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8

Gill, Christopher Stephen. "Novel hybrid organic/inorganic single-sited catalysts and supports for fine chemical and pharmaceutical intermediate synthesis." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28218.

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Thesis (M. S.)--Chemical Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Jones, Christopher; Committee Member: Agrawal, Pradeep; Committee Member: Teja, Amyn; Committee Member: Weck, Marcus; Committee Member: Zhang, John.

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Nguyen, Joseph Vu. "Design, synthesis, and optimization of recoverable and recyclable silica-immobilized atom transfer radical polymerization catalysts." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6860.

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Despite the growing interest in heterogeneous polymerization catalysis, the majority of the polymerization catalysts used industrially are single-use entities that are left in the polymer product. Recoverable and recyclable polymerization catalysts have not reached the industrial utility of single-use catalysts because the catalyst and product separation have not become economical. The successful development of recyclable transition metal polymerization catalysts must take a rational design approach, hence academic and industrial researchers need to further expand the fundamental science and

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10

Meyer, Simon [Verfasser]. "Carbide Materials as Catalysts and Catalyst Supports for Applications in Water Electrolysis and in Heterogeneous Catalysis / Simon Meyer." München : Verlag Dr. Hut, 2014. http://d-nb.info/1058284967/34.

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Libri sul tema "Catalysts"

1

International Symposium on Catalyst Deactivation (8th 1999 Brugge, Belgium). Catalyst deactivation 1999: Proceedings of the 8th International Symposium, Brugge, Belgium, October 10-13, 1999. Elsevier, 1999.

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2

1937-, Anderson James A., and Fernández Garcia Marcos, eds. Supported metals in catalysis. Imperial College Press, 2005.

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3

Ma, Zhen, and Sheng Dai, eds. Heterogeneous Gold Catalysts and Catalysis. Royal Society of Chemistry, 2014. http://dx.doi.org/10.1039/9781782621645.

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4

Maurizio, Benaglia, ed. Recoverable and recyclable catalysts. Wiley, 2009.

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5

Wijngaarden, R. J. Industrial catalysis: Optimizing catalysts and processes. Wiley-VCH, 1998.

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6

1934-, Davis Burtron H., and Occelli Mario L. 1942-, eds. Fischer-Tropsch synthesis, catalysts and catalysis. Elsevier, 2007.

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7

Zhou, Qi-Lin. Privileged chiral ligands and catalysts. Wiley-VCH, 2011.

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8

Martin, Hersch, and Freedonia Group, eds. Catalysts. Freedonia Group, 1996.

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9

1938-, Cybulski Andrzej, and Moulijn Jacob A, eds. Structured catalysts and reactors. 2nd ed. Taylor & Francis, 2005.

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10

Butt, John B. Activation, deactivation, and poisoning of catalysts. Academic Press, 1988.

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Capitoli di libri sul tema "Catalysts"

1

Pennington, John. "Catalysts and Catalysis." In An Introduction to Industrial Chemistry. Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-011-0613-9_12.

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2

Pennington, J. "Catalysts and Catalysis." In an introduction to Industrial Chemistry. Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-6438-6_11.

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3

Gao, Yuanfeng, Hong Lv, Yongwen Sun, Han Yao, Ding Hu, and Cunman Zhang. "Enhancement of Acidic HER by Fe Doped CoP with Bimetallic Synergy." In Proceedings of the 10th Hydrogen Technology Convention, Volume 1. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-8631-6_45.

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AbstractCompared to single metal site catalysis, the bimetallic synergistic strategy can exploit the complementary ability of different active sites for active species uptake and desorption to develop excellent catalysts. Pure phase metal phosphides are a disadvantage as a promising electrocatalyst for platinum-free hydrogen precipitation with either too strong or too weak adsorption of hydrogen. Here, synthetic Fe-doped CoP particles anchored with MWCNTs, which exhibited excellent catalytic performance for HER, required an overpotential of 123 mV to reach 10 mA cm−2, with a Tafel slope of 58.

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4

Dong, Shuai, Hao Liu, Xinyuan Liu, Chaoqun Li, Zhengyang Gao, and Weijie Yang. "H-Mg Bond Weakening Mechanism of Graphene-Based Single-Atom Catalysts on MgH2(110) Surface." In Proceedings of the 10th Hydrogen Technology Convention, Volume 1. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-8631-6_47.

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AbstractSolid-state hydrogen storage is gradually becoming an effective way for the large-scale storage and transportation of hydrogen energy. Magnesium hydride (MgH2) has become a promising candidate among solid-state hydrogen storage materials due to its high hydrogen storage density, low cost and good safety. However, ambiguous H-Mg bond weakening mechanism of various catalysts on MgH2 hinders the development of novel catalysts for MgH2 dehydrogenation. To overcome this problem, we applied the model catalyst, single-atom catalyst with accurately characterizable coordination structure, to un

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5

Fox, Malcolm A. "Catalysts." In Glossary for the Worldwide Transportation of Dangerous Goods and Hazardous Materials. Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-662-11890-0_15.

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6

Pierre, A. "Catalysts." In Sol-Gel Technologies for Glass Producers and Users. Springer US, 2004. http://dx.doi.org/10.1007/978-0-387-88953-5_49.

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7

Bury, Dominika, Michał Jakubczak, Jan Bogacki, Piotr Marcinowski, and Agnieszka Jastrzębska. "Catalysts." In Wastewater Treatment with the Fenton Process. CRC Press, 2023. http://dx.doi.org/10.1201/9781003364085-3.

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8

Zhang, Peng, Songzhe Chen, Laijun Wang, and Ping Zhang. "Study on the High-Performance Catalyst for Sulfuric Acid Decomposition in the IS Cycle." In Proceedings of the 10th Hydrogen Technology Convention, Volume 1. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-8631-6_36.

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AbstractThe iodine-sulfur cycle coupled with a high-temperature gas-cooled reactor is a clean and efficient hydrogen production technology. The sulfuric acid decomposition reaction is the highest temperature process in the iodine-sulfur cycle, which requires 850 °C high temperature and catalyst to carry out at a high conversion rate. This study prepared a series of loaded sulfuric acid decomposition catalysts using anatase TiO2 and Ta2O5 as catalyst carriers and precious metal Pt as the active component. XRD, BET, and ICP-MS characterization of the catalysts demonstrated that the high calcinat

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Catlow, C. R. A., C. M. Barker, R. G. Bell, et al. "Computer Modelling of Catalysts and Catalysis." In Combinatorial Catalysis and High Throughput Catalyst Design and Testing. Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4329-5_1.

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Otterstedt, Jan-Erik, and Dale A. Brandreth. "Catalyst Supports and Small Particle Catalysts." In Small Particles Technology. Springer US, 1998. http://dx.doi.org/10.1007/978-1-4757-6523-6_7.

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Atti di convegni sul tema "Catalysts"

1

Markova, Mariia, Antonina Stepacheva, Vladimir Molchanov, Galina Demidenko, and Mikhail Sulman. "FISCHER-TROPSCH SYNTHESIS OVER POLYMER SUPPORTED PROMOTED IRON CATALYSTS." In 24th SGEM International Multidisciplinary Scientific GeoConference 24. STEF92 Technology, 2024. https://doi.org/10.5593/sgem2024/4.1/s17.12.

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In recent decades, the interest of researchers has focused on the development of methods for obtaining alternative energy sources. Fischer-Tropsch synthesis is one of the methods for obtaining a wide range of hydrocarbons and their derivatives. Ru, Ni, Fe and Co are the widely used catalytically active metals in FTS. To increase the activity of the catalyst, as well as increase the yield of target products, promoters are introduced into catalytic systems. In FTS, oxides of alkaline and rare earth metals, oxides of lanthanides and actinides, and noble metals are used as modifiers. In this work,

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2

Parks, James E., H. Douglas Ferguson, Aaron M. Williams, and John M. E. Storey. "Lean NOx Trap Catalysis for NOx Reduction in Natural Gas Engine Applications." In ASME 2004 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/icef2004-0871.

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Reliable power generation and distribution is a critical infrastructure for the public and industry. Large-bore spark-ignited natural gas reciprocating engines are a reliable source of power generation. Lean operation enables efficient operation, and engines can conveniently be placed wherever natural gas resources are located. However, stricter emission regulations may limit the installation and use of more natural gas reciprocating engines if emissions cannot be reduced. Natural gas engine emissions of concern are generally methane, carbon monoxide, and oxides of nitrogen (NOx). Methane and

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3

Zhang, Aihua. "EXPERIMENTAL STUDY ON THE APPLICATION OF MACHINE LEARNING METHOD IN CATALYTIC MATERIALS." In Topics In Chemical & Material Engineering (TCME). Volkson Press, 2023. http://dx.doi.org/10.26480/smmp.01.2023.24.27.

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Machine learning has emerged as a powerful tool for analyzing complex data sets and making predictions in a wide range of applications, including catalysis. Bycombining statistical methods, algorithms, and computational power, machine learning can help identify patterns and relationships in catalytic systems that are difficult or impossible to discern using traditional approaches. This can lead to more efficient and effective catalyst design, optimization, and prediction of catalytic activity. Machine learning has already been successfully applied to various aspects of catalysis, including cat

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4

Inoue, Shuhei, Takeshi Nakajima, Kazuya Nomura, and Yoshihiro Kikuchi. "Selective Synthesis of Single-Walled Carbon Nanotubes by Blending Catalysts." In ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ht2007-32524.

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Single-walled carbon nanotubes are considered the most attractive material and a lot of synthesis processes are developed. Among these synthesis processes chemical vapor deposition processes are considered to be most suitable for macroscopic production. In many CVD processes the alcohol catalytic CVD process can be the best process because it can produce very pure nanotubes without any purification. However, cobalt is essential as a catalyst that makes the flexibility of catalysts restricted. In this paper, our investigation mainly focused on as follows: The efficiency of combined catalysts wi

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5

Karakurkchi, A., N. Sakhnenko, M. Ved, I. Parsadanov, and S. Menshov. "Nanostructured Oxide-Metal Catalysts for Intra-Cylinder Catalysis." In 2018 IEEE 8th International Conference Nanomaterials: Application & Properties (NAP). IEEE, 2018. http://dx.doi.org/10.1109/nap.2018.8914840.

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McGuire, Nicholas E., Neal P. Sullivan, Robert J. Kee, et al. "Hexaaluminate Catalysts for Fuel Reforming." In ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/fuelcell2008-65231.

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Hexaaluminate catalysts offer excellent high-temperature stability compared to the equivalent metal-based catalysts. Their stability also lends well to use as a catalyst support. However, use of novel hexaaluminates is limited in fuel processing for fuel-cell applications. In this paper, we report on the performance of hexaaluminates as a catalyst support in the steam reforming of methane. The hexaaluminates are synthesized by a metal-exchange process using alumoxane precursors that enable a wide range of metal substitutions. Performance is evaluated using a unique stagnation-flow reactor that

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Bond, Gary, A. Halman, H. Eccles, et al. "A COMPARATIVE STUDY OF MICROWAVE AND BARRIER DISCHARGE PLASMA FOR THE REGENERATION OF SPENT ZEOLITE CATALYSTS." In Ampere 2019. Universitat Politècnica de València, 2019. http://dx.doi.org/10.4995/ampere2019.2019.9936.

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Due to their acid characteristics and pore structure, which can induce high product selectivity; zeolite catalysts are used extensively in industry to catalyse reactions involving hydrocarbons. However, these catalysts can suffer from deactivation due to cracking reactions that result in the deposition of carbon leading to poisoning of the acid sites and blocking of the pores [1]. Depending upon the reaction and the particular catalyst involved this deactivation may take place over several months or even years but in some cases occurs in minutes. Therefore, zeolite catalysts are frequently rea

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8

Dumeignil, Franck, Benjamin Katryniok, and Negissa Ebadi Pour. "Glycerol polymerization over stable and selective calcium hydroxyapatite." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/dpka8345.

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High catalytic activity and large availability of Ca-based catalysts make them particulartly attractive for the glycerol polymerization reaction. However, this kind of catalyts usually suffers from a poor stability under the reactions conditions. We present herein the use of Ca-hydroxyapatites (HAps), a very abundant Ca source in the nature, as glycerol polymerization catalysts combining high performance in terms of selectivity and high resistance to deactivation by leaching. We have synthesized, characterized and tested Ca-rich, stochiometric and Ca-deficient HAps. The two latter ones were fu

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Bae, J. M., S. Ahmed, R. Kumar, and E. Doss. "Structured Catalysts for Autothermal Reforming of Hydrocarbon Fuels." In ASME 2003 1st International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2003. http://dx.doi.org/10.1115/fuelcell2003-1715.

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Argonne national laboratory has been developing fuel processing technologies for fuel cell based electric power. We have reported the development of novel catalysts that are active and selective for hydrocarbon reforming reactions. It has been realized, however, that with pellet or conventional honeycomb catalysts, the reforming process is mass transport limited. This paper reports the development of catalyst structures with microchannels that are able to reduce the diffusion resistance and thereby achieve the same production rate within a smaller reactor bed. These microchannel reforming cata

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10

Wu, Quanwen, Wenhua Luo, Daqiao Meng, Jinchun Bao, and Jingwen Ba. "High Efficient Detritiation Catalysts for Fusion Safety." In 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-81269.

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Tritium is indispensable to the fusion reactor engineering, and it must be seriously defended because of its radioactivity and permeability. The method of catalytic oxidation and absorption is the most widely used process for tritium cleanup so far, in which detritiation catalyst is of great importance. The poor stability caused by the agglomeration of noble metal limits the life of detritiation catalysts. Here, Anti–Ostwald Ripening is used to prepare single-atom detritiation catalysts S-Pt/Ce0.7Zr0.3O2 for tritium (HT, DT and T2) oxidation. Single-atom dispersed Pt ensures the catalytic acti

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Rapporti di organizzazioni sul tema "Catalysts"

1

Badrinarayanan and Olsen. PR-179-11201-R01 Performance Evaluation of Multiple Oxidation Catalysts on a Lean Burn Natural Gas Engine. Pipeline Research Council International, Inc. (PRCI), 2012. http://dx.doi.org/10.55274/r0010772.

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Two-way catalysts or oxidation catalysts are the common after-treatment systems used on lean burn natural gas engines to reduce CO, VOCs and formaldehyde emissions. The study evaluates the performance of oxidation catalysts from commercial vendors for varying catalyst temperature and space velocity. For this study, a part of the exhaust from a Waukesha VGF-18 GL lean burn natural gas engine was flowed through a catalyst slipstream system to assess the performance of the oxidation catalysts. The slipstream is used to reduce the size of the catalysts and to allow precise control of temperature a

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2

Stevens and Olsen. PR-179-12214-R01 CO Sensor Experimental Evaluation for Catalyst Health Monitoring. Pipeline Research Council International, Inc. (PRCI), 2014. http://dx.doi.org/10.55274/r0010827.

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Oxidation catalysts and three-way catalysts can be used to reduce the amount of CO present in engine exhaust. For 2-stroke lean-burn engines, the oxidation catalyst degrades over time be-cause of the buildup of poisons such as sulfur, zinc, phosphorous, and calcium. Three-way cata-lysts used with stoichiometric engines also degrade over time. Emissions analyzers are often used to evaluate the degradation of oxidation catalysts and three-way catalysts, but it can be very time consuming and expensive. Ideally, a simple sensor system would be beneficial for operating companies to determine if the

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3

Olsen, Daniel, Bryan Hackleman, and Rodrigo Bauza Tellechaea. PR-179-16207-R01 Oxidation Catalyst Degradation on a 2-Stroke Lean-Burn NG Engine - Washing. Pipeline Research Council International, Inc. (PRCI), 2019. http://dx.doi.org/10.55274/r0011586.

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Oxidation catalysts are often utilized to reduce carbon monoxide, formaldehyde, and volatile organic compounds in order to meet emissions regulations for large bore natural gas engines. These catalysts degrade over time and need to be replaced or regenerated to maintain emissions compliance. This work evaluates the effectiveness of catalyst regeneration, or catalyst washing. The evaluation is performed by utilizing field and laboratory slip streams combined with catalyst module performance (reduction efficiency) measurements and catalyst material surface analysis to quantify catalyst poisons.

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4

Olsen and Neuner. PR-179-12207-R01 Performance Measurements of Oxidation Catalyst on an Exhaust Slipstream. Pipeline Research Council International, Inc. (PRCI), 2013. http://dx.doi.org/10.55274/r0010800.

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Oxidation catalysts are effective at reducing CO, formaldehyde, and VOCs as long as the catalyst temperature is above the light-off temperature for each species. It is important to understand the effects of temperature and space velocity on regulated species in order to effectively apply oxidation catalyst technology to lean burn engines, in particular 2-stroke engines that typically have lower exhaust temperatures. Various catalysts were tested on an exhaust slipstream coupled to a 4-stroke lean-burn engine which allows tests to be conducted at different temperatures and flow rates. The effec

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5

Wongkasemjit, Sujitra. Treatment of dye containing in textile wastewater using TS-1, Ti-MCM-41 and Bismuth Titanate Catalysts : final report. Chulalongkorn University, 2007. https://doi.org/10.58837/chula.res.2007.94.

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This research was to study the photocatalytic activity of three different metal oxide catalysts, namely MCM-41, TS-1, and bismuth titanate (Bi[subscript 12]TiO[subscript 20]) in the reactive black 5 dye solution and the waste water obtained from a dye industry. These catalysts were synthesized using silatrane, titanium glycolate and bismuth nitrate precursors. The degradation process was first studied in the reactive black 5 dye model. The parameters in this study were pH, amounts of H[subscript 2]O[subscript 2] and Ti-loading in zeolite structure while fixing the organic dye at 40 ppm. At pH3

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6

Defoort, Willson, and Olsen. L51849 Performance Evaluation of Exhaust Catalysts During the Initial Aging on Large Industrial Engines. Pipeline Research Council International, Inc. (PRCI), 2001. http://dx.doi.org/10.55274/r0011213.

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An investigation of catalyst performance during the initial aging process, providing insight into the deactivation rate of the catalyst and assisting in predicting the operational lifetime of the catalyst was preformed. The information gained through the test program provides a mechanism to assist in developing new technologies geared at reducing engine emission while providing improvements in efficiency, reliability, and operability for the aging industrial reciprocating engine fleet. Two natural gas lean burn engines, a 2-stroke, large bore slow speed and a 4-stroke medium bore medium speed,

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7

Ravindra Datta, Ajeet Singh, Manuela Serban, and Istvan Halasz. Supported Molten Metal Catalysis. A New Class of Catalysts. Office of Scientific and Technical Information (OSTI), 2006. http://dx.doi.org/10.2172/889459.

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8

Chavadej, Sumaeth, Thammanoon Sreethawong, Anothai Tansuwan, and Thanapoom Suwannabart. Ethylene oxide reaction over Ag catalysts in low-temperature corona discharge. Chulalongkorn University, 2009. https://doi.org/10.58837/chula.res.2009.80.

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Part 1: The epoxidation of ethylene over different catalysts - namely Ag/(low-surface-area, LSA)-Al2O3, Ag/(high-surface-area, HSA)γ-Al2O3, and Au-Ag/(HSA)γ-Al2O3 - in a low-temperature corona discharge system was investigated. In a comparison among the studied catalysts, the Ag/(LSA)-Al2O3 catalyst was found to offer the highest selectivity for ethylene oxide, as well as the lowest selectivity for carbon dioxide and carbon monoxide. The selectivity for ethylene oxide increased with increasing applied voltage, while the selectivity for ethylene oxide remained unchanged when the frequency was

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9

Swanson, Dr Larry, and Christopher Samuelson. PR-362-06208-R01 Evaluation of Byproduct Emissions from Gas Turbine SCR Catalyst. Pipeline Research Council International, Inc. (PRCI), 2009. http://dx.doi.org/10.55274/r0010978.

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The primary objective of the test program was to evaluate byproduct emissions at steady state and transient operating conditions for two commercially available SCR catalysts used in gas turbine applications. Both NOX removal efficiency and ammonia slip behavior were also examined to validate expected catalyst trends and activity. Even though the study replicated expected field catalyst process conditions as well as possible (e.g., flue gas temperatures, space velocities, and inlet species concentrations), the data and results are from pilot-scale testing only, and consequently may differ from

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10

Pfefferle, Lisa D., and Gary L. Haller. Novel Reforming Catalysts. Office of Scientific and Technical Information (OSTI), 2012. http://dx.doi.org/10.2172/1053078.

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