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Literatura académica sobre el tema "Nanocatalysts for Hydrogenation reactions"

Autor: Grafiati

Publicado: 6 de septiembre de 2023

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Artículos de revistas sobre el tema "Nanocatalysts for Hydrogenation reactions"

Shakil Hussain, S. M., Muhammad Shahzad Kamal y Mohammad Kamal Hossain. "Recent Developments in Nanostructured Palladium and Other Metal Catalysts for Organic Transformation". Journal of Nanomaterials 2019 (20 de octubre de 2019): 1–17. http://dx.doi.org/10.1155/2019/1562130.

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Nanocatalysis is an emerging field of research and is applicable to nearly all kinds of catalytic organic conversions. Nanotechnology is playing an important role in both industrial applications and academic research. The catalytic activities become pronounced as the size of the catalyst reduces and the surface area-to-volume ratio increases which ultimately enhance the activity and selectivity of nanocatalysts. Similarly, the morphology of the particles also has a great impact on the activity and selectivity of nanocatalysts. Moreover, the electronic properties and geometric structure of nanocatalysts can be affected by polar and nonpolar solvents. Various forms of nanocatalysts have been reported including supported nanocatalysts, Schiff-based nanocatalysts, graphene-based nanocatalysts, thin-film nanocatalysts, mixed metal oxide nanocatalysts, magnetic nanocatalysts, and core-shell nanocatalysts. Among a variety of different rare earth and transition metals, palladium-based nanocatalysts have been extensively studied both in academia and in the industry because of their applications such as in carbon-carbon cross-coupling reactions, carbon-carbon homocoupling reactions, carbon-heteroatom cross-coupling reactions, and C-H activation, hydrogenation, esterification, oxidation, and reduction. The current review highlights the recent developments in the synthesis of palladium and some other metal nanocatalysts and their potential applications in various organic reactions.

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Zhao, Jianbo, Liming Ge, Haifeng Yuan, Yingfan Liu, Yanghai Gui, Baoding Zhang, Liming Zhou y Shaoming Fang. "Heterogeneous gold catalysts for selective hydrogenation: from nanoparticles to atomically precise nanoclusters". Nanoscale 11, n.º 24 (2019): 11429–36. http://dx.doi.org/10.1039/c9nr03182k.

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Andrade, Marta A. y Luísa M. D. R. S. Martins. "Supported Palladium Nanocatalysts: Recent Findings in Hydrogenation Reactions". Processes 8, n.º 9 (17 de septiembre de 2020): 1172. http://dx.doi.org/10.3390/pr8091172.

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Catalysis has witnessed a dramatic increase on the use of metallic nanoparticles in the last decade, opening endless opportunities in a wide range of research areas. As one of the most investigated catalysts in organic synthesis, palladium finds numerous applications being of significant relevance in industrial hydrogenation reactions. The immobilization of Pd nanoparticles in porous solid supports offers great advantages in heterogeneous catalysis, allowing control of the major factors that influence activity and selectivity. The present review deals with recent developments in the preparation and applications of immobilized Pd nanoparticles on solid supports as catalysts for hydrogenation reactions, aiming to give an insight on the key factors that contribute to enhanced activity and selectivity. The application of mesoporous silicas, carbonaceous materials, zeolites, and metal organic frameworks (MOFs) as supports for palladium nanoparticles is addressed.

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Rossi, Liane M., Natália J. S. Costa, Fernanda P. Silva y Renato V. Gonçalves. "Magnetic nanocatalysts: supported metal nanoparticles for catalytic applications". Nanotechnology Reviews 2, n.º 5 (1 de octubre de 2013): 597–614. http://dx.doi.org/10.1515/ntrev-2013-0021.

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AbstractThis review is focused on metal nanoparticles (NPs) supported on magnetic responsive solids and their recent applications as magnetically recoverable nanocatalysts. Magnetic separation is a powerful tool for the fast separation of catalysts from reaction medium and an alternative to time-, solvent-, and energy-consuming separation procedures. Metal NPs attached to a magnetic solid can be easily carried and recovered by magnetic separation. Some examples of magnetically recoverable metal NPs used in hydrogenation, oxidation, C-C coupling reactions, photocatalysis, and other organic reactions will be given.

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Jiang, Nan, Xiao Zhou, Yi-Fan Jiang, Zhi-Wei Zhao, Liu-Bo Ma, Cong-Cong Shen, Ya-Nan Liu, Cheng-Zong Yuan, Shafaq Sahar y An-Wu Xu. "Oxygen deficient Pr6O11 nanorod supported palladium nanoparticles: highly active nanocatalysts for styrene and 4-nitrophenol hydrogenation reactions". RSC Advances 8, n.º 31 (2018): 17504–10. http://dx.doi.org/10.1039/c8ra02831a.

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Jiang, Yi-Fan, Cheng-Zong Yuan, Tuck-Yun Cheang y An-Wu Xu. "Highly active and durable Pd nanocatalyst promoted by an oxygen-deficient terbium oxide (Tb4O7−x) support for hydrogenation and cross-coupling reactions". New Journal of Chemistry 43, n.º 23 (2019): 9210–15. http://dx.doi.org/10.1039/c9nj01966a.

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Xue, Guangxin, Linlin Yin, Shengxian Shao y Guodong Li. "Recent progress on selective hydrogenation of phenol toward cyclohexanone or cyclohexanol". Nanotechnology 33, n.º 7 (26 de noviembre de 2021): 072003. http://dx.doi.org/10.1088/1361-6528/ac385f.

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Abstract Phenol is considered as an important platform molecule for synthesizing value-added chemical intermediates and products. To date, various strategies for phenol transformation have been developed, and among them, selective hydrogenation of phenol toward cyclohexanone (K), cyclohexanol (A) or the mixture KA oil has been attracted great interest because they are both the key raw materials for the synthesis of nylon 6 and 66, as well as many other chemical products, including polyamides. However, until now it is still challengeable to realize the industrilized application of phenol hydrogenation toward KA oils. To better understand the selective hydrogenation of phenol and fabricate the enabled nanocatalysts, it is necessary to summarize the recent progress on selective hydrogenation of phenol with different catalysts. In this review, we first summarize the selective hydrogenation of phenol toward cyclohexanone or cyclohexanol by different nanocatalysts, and simultaneously discuss the relationship among the active components, type of supports and their performances. Then, the possible reaction mechanism of phenol hydrogenation with the typical metal nanocatalysts is summarized. Subsequently, the possible ways for scale-up hydrogenation of phenol are discussed. Finally, the potential challenges and future developments of metal nanocatalysts for the selective hydrogenation of phenol are proposed.

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Wang, Wei, Zixin Wang, Mengqi Sun, Hui Zhang y Hui Wang. "Ligand-free sub-5 nm platinum nanocatalysts on polydopamine supports: size-controlled synthesis and size-dictated reaction pathway selection". Nanoscale 14, n.º 15 (2022): 5743–50. http://dx.doi.org/10.1039/d2nr00805j.

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Catalytic bimolecular transfer hydrogenation reactions undergo a pathway switch between the Langmuir–Hinshelwood and the Eley–Rideal mechanisms as the size of Pt nanocatalysts varies in the sub-5 nm regime.

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Wang, Xin, Yi-Fan Jiang, Ya-Nan Liu y An-Wu Xu. "Erbium oxide as a novel support for palladium nanocatalysts with strong metal–support interactions: remarkable catalytic performance in hydrogenation reactions". New Journal of Chemistry 42, n.º 24 (2018): 19901–7. http://dx.doi.org/10.1039/c8nj05199b.

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Dhiman, Mahak y Vivek Polshettiwar. "Ultrasmall nanoparticles and pseudo-single atoms of platinum supported on fibrous nanosilica (KCC-1/Pt): engineering selectivity of hydrogenation reactions". Journal of Materials Chemistry A 4, n.º 32 (2016): 12416–24. http://dx.doi.org/10.1039/c6ta04315a.

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Fibrous nanosilica supported ultrasmall platinum nanoparticles were prepared as novel nanocatalysts for hydrogenation reactions. Catalysts with sub-nanometer Pt or pseudo-single atoms of Pt had excellent selectivity, which decreased drastically with an increase in particle size.

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Tesis sobre el tema "Nanocatalysts for Hydrogenation reactions"

He, Tianwei. "Computational discovery and design of nanocatalysts for high efficiency electrochemical reactions". Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/203969/1/Tianwei_He_Thesis.pdf.

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This thesis reports a computational discovery and design of highly efficient electrocatalysts for various of electrochemical reactions. The method is based on the Density Functional Theory (DFT) by using Vienna ab initio simulation package (VASP). This project is a step forward in developing the low-cost, high activity, selectivity, stability and scalability for the electrochemical reactions, which could make a contribution to the global-scale green energy system for a clean and sustainable energy future.

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Esmaeili, E., A. M. Rashidi, Y. Mortazavi, A. A. Khodadadi y M. Rashidzadeh. "The Role of Pore Structure of SMFs-based Pd Nanocatalysts in Deactivation Behavioral Pattern Upon Acetylene Hydrogenation Reaction". Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35216.

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In this research, SMFs panels were applied for further deposition of CNFs, ZnO and Al2O3 to hydro-genate selectively acetylene to ethylene. To understand the role of different structures of the examined supports, the characterization methods of SEM, ASAP, NH3-TPD and N2 adsorption-desorption isotherms were used. Following the characterization of green oil by FTIR, the presence of more unsaturated constitu-ents and then, more branched hydrocarbons formed upon the reaction over alumina-supported catalyst in comparison with the ones supported on CNFs and ZnO was confirmed, which in turn, could block the pores mouths. Besides the limited hydrogen transfer, the lowest pore diameters of Al2O3 / SMFs close to the sur-face, supported by N2 adsorption-desorption isotherms could explain the fast deactivation of this catalyst, compared to the other ones. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35216

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Weiner, Jonathan. "Colloidal Cu/ZnO nanocatalysts for CO2 hydrogenation to methanol". Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/57498.

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This thesis centres on the development of colloidal nanoparticles for the hydrogenation of carbon dioxide to methanol. Chapter two focusses on the synthesis of zinc oxide (ZnO) nanoparticles through the hydrolysis of diethylzinc in the presence of sub-stoichiometric quantities of organic ligands. Characterisation of the product, through a range of spectroscopic, diffraction and electron microscopy techniques, reveals small (3-4 nm), equiaxial, mono-disperse ZnO nanoparticles coordinated to alkyl-carboxylate, phosphinate and sulfinate ligands. Detailed investigation of the dioctyl-phosphinate capped-zinc oxide nanoparticles reveals that increasing the loading of ligand into the reaction (from 0.05-0.33 equivalents of ligand to zinc) does not affect the size or morphology of the nanoparticles, rather influencing the ligand density and coverage of the nanoparticle surface. In chapter three, these partially capped ZnO nanoparticles, mixed with copper nanoparticles, demonstrate catalytic activity for CO2 hydrogenation. Post-reaction analysis showed significant nanoparticle rearrangement, with an interface forming between the copper and the ZnO. In some cases, a self-assembled nanostructure is observed, consisting of a copper nanoparticle sandwiched between two pyramidal zinc oxide nanoparticles. The ligand has a significant effect on the activity of the catalyst; more reductively stable di-alkyl phosphinate ligands show superior activity to carboxylates. Decreasing the ligand loading on the zinc oxide nanoparticles, results in a higher peak activity due to the decreased ligand density exposing more of the catalyst surface, however the stability of the catalyst is also reduced. In chapter four, the interface between nanoparticles is targeted, with the goal of depositing copper onto the ZnO colloids through reduction and thermolysis reactions to form hybrid Cu/ZnO nanostructures. The most effective route entails the hydrogenolysis of mesitylcopper(I) on to the ZnO nanoparticles, the resulting nanocatalyst displays superior peak activity to both the mixed nanoparticle catalyst described above and a suspension of the commercial catalyst run under the same conditions.

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Konnerth, Hannelore [Verfasser]. "Towards Selective Hydrogenation using Metal Nanocatalysts in Ionic Liquids / Hannelore Konnerth". München : Verlag Dr. Hut, 2018. http://d-nb.info/1155057562/34.

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Quan, Xu. "Hydrogenation, Transfer Hydrogenation and Hydrogen Transfer Reactions Catalyzed by Iridium Complexes". Doctoral thesis, Stockholms universitet, Institutionen för organisk kemi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-119701.

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The work described in this thesis is focused on the development of new bidentate iridium complexes and their applications in the asymmetric reduction of olefins, ketones and imines. Three new types of iridium complexes were synthesized, which included pyridine derived chiral N,P-iridium complexes, achiral NHC complexes and chiral NHC-phosphine complexes. A study of their catalytic applications demonstrated a high efficiency of the N,P-iridium complexes for asymmetric hydrogenation of olefins, with good enantioselectivity. The carbene complexes were found to be very efficient hydrogen transfer mediators capable of abstracting hydrogen from alcohols and subsequently transfer it to other unsaturated bonds. This hydrogen transferring property of the carbene complexes was used in the development of C–C and C–N bond formation reactions via the hydrogen borrowing process. The complexes displayed high catalytic reactivity using 0.5–1.0 mol% of the catalyst and mild reaction conditions. Finally chiral carbene complexes were found to be activated by hydrogen gas. Their corresponding iridium hydride species were able to reduce ketones and imines with high efficiency and enantioselectivity without any additives, base or acid.

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 5: Submitted. Paper 6: Manuscript.

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Chen, H. Y. "Hydrogenation reactions catalysed by organometallic complexes". Thesis, University College London (University of London), 2012. http://discovery.ucl.ac.uk/1338140/.

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In this thesis we have computationally studied two types of reduction processes which can be classified as asymmetric hydrogenation of ketones and reduction of imines. Density functional theory has been applied throughout the thesis. The reduction of acetophenone to phenylethanol catalysed by the trans- Ru(II)H2(diphosphine)(diamine) has been studied with an emphasis on the effect of the structure of the diphosphine and diamine ligands. The computed reaction pathways of the Ru(II)H2(diphosphine)[(S,S)-DPEN] catalysed reactions with different (S)-diphosphine ligands (XylBINAP, TolBINAP and BINAP) shows that the presence of two methyl groups in the meta position is critical to obtaining a high difference in activation energy for the reaction pathways associated with the (R)- and (S)-alcohols, and consequently high enantioselectivity. The effect of the diamine structure, while keeping the TolBINAP and XylBINAP fixed, has also been analysed. To enhance the enantioselectivity of the TolBINAP system, the addition of two methyl groups and the removal of a phenyl group on the diamine (DMAPEN) create the necessary steric interactions. We conclude this section by reporting a correlation between the enantiomeric excess and the difference in the computed activation energies along the two most favourable (S)- and (R)-reaction pathways, which shows that the computational procedure adopted could be used to predict the enantiomeric excess of ketone hydrogenation reactions catalysed by Noyori-type catalysts, and assist in the choice of ligands when optimising the enantiomeric excess. Calculations yield new insights into the structural, electronic and catalytic properties of the hydrogenation of ketones catalysed by the simplified Fe(II)H2(PH3)2(en) and real Fe(II)H2(diphosphine)(diamine) complexes. Calculations conducted using several different functionals on the trans- and cis-isomers of Fe(II)H2[(S)-XylBINAP][(S,S)-DPEN] complexes show that, as with the Ru(II)H2(diphosphine)(diamine) complexes, the trans- [Fe(II)H2(diphosphine)(diamine)] complex is the more stable isomer. Analysis of the spin states of the trans-[Fe(II)H2(diphosphine)(diamine)] complexes also shows that the singlet state is significantly more stable than the triplet and quintet states, as with the Ru(II)H2(diphosphine)(diamine) complexes. Calculations on the catalytic cycle for the hydrogenation of ketones using the two simplified trans-[M(II)H2(PH3)2(en)] catalysts, where M is either Ru or Fe, show that the mechanism of reactions as well as the activation energies are very similar, in particular: (a) the ketone/alcohol hydrogen transfer reaction occurs through the metal–ligand bifunctional mechanism, with energy barriers of 3.4 kcal/mol and 3.2 kcal/mol for the ruthenium- and iron-catalysed reactions respectively; (b) the heterolytic splitting reactions of H2 across the M=N bond for the regeneration of the ruthenium and iron catalysts have activation barriers of 13.8 kcal/mol and 12.8 kcal/mol respectively, and the heterolytic splitting steps are expected to be the rate-determining steps for both catalytic systems. The reduction of acetophenone by the trans- [Fe(II)H2{(S)-XylBINAP}{(S,S)-DPEN}] complexes along the two competitive reaction pathways shows that the intermediates for the iron catalytic system are similar to those responsible for a high enantioselectivity of (R)-alcohol in the trans-[Ru(II)H2{(S)- XylBINAP}{(S,S)-DPEN}] catalysed acetophenone hydrogenation reaction. Thus, the high enantiomeric excess in the hydrogenation of acetophenone could, in principle, be achieved using iron catalysts. In experimental work, Xiao and co-workers discovered cyclometalated iridium complexes in imine reduction with an unusually broad substrate scope, which shows that the more positive hydricity of iridium hydride affords a higher activity. To study these systems computationally, we initially tested parameters, including exchange-correlation functionals, basis sets and pseudopotentials, subsequently studying the charge and molecular orbital properties of isolated iridium(III) catalysts with different electrondonating and withdrawing functional groups, and investigating their mechanistic details. Three possible reaction pathways in the hydride formation step and six possible reaction pathways in the hydride transfer step have been suggested to locate transition states in both the gas phase and methanol solution. Our results show that hydride formation is the rate-determining step and with explicit methanol included in the reaction, the activation energies in the hydride formation and hydride transfer steps drop by ca. 10 and 4 kcal/mol respectively, compared with those computed in the gas phase.

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MacNair, Alistair James. "Iron-catalysed hydrogenation and hydroboration reactions". Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/28863.

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Hydrogenation and hydrofunctionalisation reactions provide efficient, sustainable methodologies for the manipulation of synthetic handles and the formation of carbon-heteroatom bonds from readily available starting materials. Traditional hydrogenation methods typically require precious or semi-precious transition metal complexes or finely divided powders. Iron-based catalysts offer several advantages over more traditional ‘noble’ metal systems due to the high abundance, long-term availability, low cost and low toxicity of iron. To date, the most powerful iron-catalysed hydrogenation and hydrofunctionalisation reactions have required either highly air-sensitive iron(0) complexes or iron(II) complexes activated with an extremely reactive, pyrophoric organometallic reagent. An operationally simple and environmentally benign formal hydrogenation protocol has been developed using a simple iron(III) salt and NaBH4; an inexpensive, bench stable, stoichiometric reductant. This reaction has been applied to the reduction of terminal alkenes (22 examples, up to 95% yield) and nitro groups (26 examples, up to 95% yield) in ethanol, under ambient conditions (Scheme A1). Two novel series of structurally related alkoxy-tethered N-heterocyclic carbene (NHC) iron(II) complexes have been developed as catalysts for the regioselective hydroboration of alkenes. Significantly, Markovnikov selective alkene hydroboration with pinacolborane (HBpin) has been controllably achieved for the first time using an iron catalyst (11 examples, 35-90% isolated yield) with up to 37:1 branched:linear selectivity (Scheme A2). anti-Markovnikov selective alkene hydroboration was also achieved using catecholborane (HBcat) and modification of the ligand backbone (6 examples, 44-71% yield). In both cases, ligand design has enabled activator-free iron catalysis.

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Bryan, Aiden. "Electrochemical reactions". Thesis, Queen's University Belfast, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318926.

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Cao, X. M. "Insight into hydrogenation reactions in heterogeneous catalysis". Thesis, Queen's University Belfast, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.546020.

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Shermer, Duncan J. "Sequential reactions involving catalytic transfer hydrogenation technology". Thesis, University of Bath, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432384.

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Más fuentes

Libros sobre el tema "Nanocatalysts for Hydrogenation reactions"

Nikolaevich, Kursanov Dmitriĭ y Institut ėlementoorganicheskikh soedineniĭ (Akademii͡a nauk SSSR), eds. Ionic hydrogenation and related reactions. Chur, Switzerland: Harwood Academic Publishers, 1985.

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Nikolaevich, Kursanov Dmitriĭ y Institut ėlementoorganicheskikh soedineniĭ (Akademii͡a︡ nauk SSSR), eds. Ionic hydrogenation and related reactions. Chur, Switzerland: Harwood Academic Publishers, 1985.

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Fischer-Tropsch Synthesis and Related Reactions. Elsevier, 2020.

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Schaub, Thomas, Robert Langer, Hansjörg Grützmacher, Thomas Zell y Monica Trincado. Hydrogen Storage: Based on Hydrogenation and Dehydrogenation Reactions of Small Molecules. de Gruyter GmbH, Walter, 2019.

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Primer in Frustrated Lewis Pair Hydrogenation: Concepts to Applications. Royal Society of Chemistry, The, 2021.

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Stephan, Douglas W. Primer in Frustrated Lewis Pair Hydrogenation: Concepts to Applications. Royal Society of Chemistry, The, 2023.

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Innovative Catalysis In Organic Synthesis Oxidation Hydrogenation And Cx Bond Forming Reactions. Wiley-VCH Verlag GmbH, 2012.

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Andersson, Pher G. Innovative Catalysis in Organic Synthesis: Oxidation, Hydrogenation, and C-X Bond Forming Reactions. Wiley & Sons, Incorporated, John, 2012.

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Capítulos de libros sobre el tema "Nanocatalysts for Hydrogenation reactions"

Narayanan, Radha. "Nanocatalysts for Hydrogenation Reactions". En Nanocatalysis Synthesis and Applications, 405–41. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118609811.ch11.

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Yang, Guoxiang, Yasutata Kuwahara, Kohsuke Mori y Hiromi Yamashita. "Hollow Carbon Spheres Encapsulating Metal Nanoparticles for CO2 Hydrogenation Reactions". En Core-Shell and Yolk-Shell Nanocatalysts, 425–40. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0463-8_26.

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Kuwahara, Yasutaka y Hiromi Yamashita. "Design and Synthesis of Yolk–Shell Nanostructured Silica Encapsulating Metal Nanoparticles and Aminopolymers for Selective Hydrogenation Reactions". En Core-Shell and Yolk-Shell Nanocatalysts, 395–411. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0463-8_24.

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Claver, Carmen, Sergio Castillón, Montserrat Diéguez y Oscar Pàmies. "Hydrogenation Reactions". En Carbohydrates - Tools for Stereoselective Synthesis, 155–82. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2013. http://dx.doi.org/10.1002/9783527654543.ch8.

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Fihri, Aziz y Vivek Polshettiwar. "Hydrogenolysis Reactions Using Nanocatalysts". En Nanocatalysis Synthesis and Applications, 443–67. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118609811.ch12.

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Chinchilla, Rafael y Carmen Nájera. "Sonogashira Reactions Using Nanocatalysts". En Nanocatalysis Synthesis and Applications, 89–131. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118609811.ch4.

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García-Álvarez, Joaquín, Sergio E. García-Garrido y Victorio Cadierno. "Nanocatalysts for Rearrangement Reactions". En Nanocatalysis Synthesis and Applications, 251–85. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118609811.ch8.

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Santonocito, Rossella y Giuseppe Trusso Sfrazzetto. "Green Nanocatalysts in Organic Synthesis". En Green Organic Reactions, 221–36. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6897-2_13.

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Li, Jie Jack. "Noyori asymmetric hydrogenation". En Name Reactions, 287–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05336-2_214.

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Li, Jie Jack. "Noyori asymmetric hydrogenation". En Name Reactions, 440–42. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-03979-4_195.

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Actas de conferencias sobre el tema "Nanocatalysts for Hydrogenation reactions"

Feng, Hao, Xun Zhu, Rong Chen y Qiang Liao. "Visualization Study on Two-Phase Flow Behaviors in the Gas-Liquid-Solid Microreactor for Hydrogenation of Nitrobenzene". En ASME 2016 Fluids Engineering Division Summer Meeting collocated with the ASME 2016 Heat Transfer Summer Conference and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fedsm2016-1011.

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In this study, visualization study on the gas-liquid two phase flow characteristics in a gas-liquid-solid microchannel reactor was carried out. Palladium nanocatalyst was coated onto the polydopamine functionalized surface of the microchannel through eletroless deposition. The materials characterization results indicated that palladium nanocatalyst were well dispersed on the modified surface. The effects of both the gas and liquid flow rates as well as inlet nitrobenzene concentration on the two-phase flow characteristics were studied. The experimental results revealed that owing to the chemical reaction inside the microreactor, the gas slug length gradually decreased along the flow direction. For a given inlet nitrobenzene concentration, increasing the liquid flow rate or decreasing the gas flow rate would make the variation of the gas slug length more obvious. High inlet nitrobenzene concentration would intensify both the nitrobenzene transfer efficiency and gas reactants consumption, and thereby the flow pattern in the microchannel was transferred from Taylor flow into bubble flow. Besides, the effect of both flow rate and original nitrobenzene concentration on the variation of nitrobenzene conversion and the desired product aniline yield were also discussed.

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Franz, A. J., K. F. Jensen y M. A. Schmidt. "Palladium based micromembranes for hydrogen separation and hydrogenation/dehydrogenation reactions". En Technical Digest. IEEE International MEMS 99 Conference. Twelfth IEEE International Conference on Micro Electro Mechanical Systems (Cat. No.99CH36291). IEEE, 1999. http://dx.doi.org/10.1109/memsys.1999.746859.

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Kosaraju, K., A. Rahman, M. Duncan, B. Tatineni, Y. Basova, V. Deshmane, R. Abrokwah et al. "Bimetallic nanocatalysts in mesoporous silica for steam reforming reactions to produce H2 for fuel cells". En International conference on Future Energy, Environment and Materials. Southampton, UK: WIT Press, 2014. http://dx.doi.org/10.2495/feem130401.

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Rossi, Kevin. "Multiscale design of nanocatalysts for electrochemical reactions, the case of Pt nanoparticles for Oxygen Reduction". En International Conference on Electrocatalysis for Energy Applications and Sustainable Chemicals. València: Fundació Scito, 2020. http://dx.doi.org/10.29363/nanoge.ecocat.2020.019.

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Mewes, Dieter y Dierk Wiemann. "Numerical Calculation of Mass Transfer With Heterogeneous Chemical Reactions in Three-Phase Bubble Columns". En ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37031.

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Bubble column reactors are used for several processes in the chemical industry, e.g. hydrogenation or oxidation reactions. At the bottom of the reactor a gaseous phase is dispersed into a continuous liquid phase with suspended particles. The resulting bubble swarm induces three-dimensional, time-dependent velocity and concentration fields, which are predicted numerically. All phases are described by an Eulerian approach. The numerical calculations of the local interfacial area density and the interphase transfer terms for mass and momentum are based on a population balance equation approach which enables an effective way to couple population balance and computational fluid dynamics. In three-phase gas-liquid-solid flow particles with diameters of 100 μm are considered as catalyst for a heterogeneous chemical reaction. The influence of particles on bubble coalescence has been investigated in order to extend an existing model for the kernel functions in the population balance equation describing bubble coalescence and dispersion. The resulting three-dimensional, time-dependent velocity and concentration fields are described and graphically presented for the hydrogenation of anthra-chinone.

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Ruiz-Cañas, M. C., H. A. Garcia-Duarte, R. A. Perez-Romero y E. Manrique. "Numerical Simulation of Cyclic Steam Stimulation and Solvents Enhanced With Nanocatalysts: A Methodologic Approach". En SPE Latin American and Caribbean Petroleum Engineering Conference. SPE, 2023. http://dx.doi.org/10.2118/213176-ms.

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Abstract One of the alternatives to optimize conventional Thermal EOR is using hybrid technologies such as the combination of steam and solvent enhanced with nanomaterials. Due to the necessity to evaluate nanocatalysts' impact in this hybrid technology, it is necessary to forecast different injection scheme scenarios. This work shows a numerical simulation methodology approach for evaluating the impact of including nanocatalysts in Cyclic Steam Stimulation (CSS) supported by experimental data obtained from previous steam-based hybrid evaluations. Based on viscosity curves, phase behavior of reservoir fluids and solvent enhanced with nanomaterials, thermogravimetric tests at high pressure, fluid-fluid and fluid-rock tests, and properties of produced oil samples, among others, it was possible to determine kinetic properties required for the construction of the numerical simulation model of the steam-based hybrid technology. The methodology includes the evaluation of injection scheme scenarios to compare the hybrid Cyclic Steam Stimulation (CSS) - solvent with nanoparticles and conventional CSS. Supported by the experimental results of the hybrid technology and the study of the phenomena involved in this thermal EOR process, a procedure was established that considers the main characteristics of the hybrid cyclic steam technology with solvents enhanced with nanomaterials (HYB-SEN), the reservoir, and some operational variables. The main objective of this procedure is to evaluate the oil production response of the catalysis of aquathermolysis reactions of asphaltenes. Also, this methodology includes the development of the kinetic model based on the thermogravimetric analysis performed on nanoparticles adsorbed by asphaltenes and Friedman's isoconversional kinetic method. The latter allowed for determining the activation energy, pre-exponential factor, and reaction order, which are inputs to numerical simulation. On the other hand, fluid property modeling was useful for integrating experimental tests such as simulated distillation, compositional analysis, properties of crude oil resulting from the aquathermolysis reaction, and the solvent used in the process (Naphtha). The lack of information on how to represent catalytic phenomena by numerical simulation due to the presence of nanomaterials represents a great challenge to evaluating new hybrid technologies. This innovative methodological approach allows integrating the experimental results into the numerical simulation. It represents physical and chemical phenomena that occur during the process to improve the understanding of the impact of using HYB-SEN for CCS.

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Yuen, Po Ki y Michael E. DeRosa. "Flexible Microfluidic Devices With Three-Dimensional Interconnected Microporous Walls". En ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63758.

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Microfluidics is emerging as one of the fastest growing fields for chemical and biological applications. The demand has also increased for methods of fabricating low-cost prototype microfluidic devices rapidly with compatible materials and novel functional attributes. One attractive feature that can be incorporated into microfluidic devices is a porous membrane or porous channel wall [1]. Devices with such features can potentially be used for multiphase catalytic reactions in chemical and pharmaceutical applications similar to the gas-liquid-solid hydrogenation reactions reported by Kobayahi et al. [2] or gas-liquid syntheses by Park and Kim [3].

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Garifullina, Chulpan Aydarovna, Ildar Ilyasovich Ibragimov, Ilya Mikhailovich Indrupskiy, Dmitriy Sergeevich Klimov, Ernest Sumbatovich Zakirov y Rifkhat Zinnurovich Sakhabutdinov. "Investigation of CO2 Utilization Processes on Metal-Containing Fillers with Generation of Hydrogen and Hydrocarbons". En SPE Russian Petroleum Technology Conference. SPE, 2021. http://dx.doi.org/10.2118/206612-ms.

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Abstract Continuing consumption of fossil fuels around the world, which has led to an increasing concentration of carbon dioxide CO2 in the atmosphere and global climate change caused by greenhouse gases, has become one of the main challenges for humanity. Heterogeneous catalytic hydrogenation of carbon dioxide in order to obtain valuable carbon-containing products and materials is one of the decarbonization directions. There is much research in the world dedicated to the hydrogenation of CO2 to various hydrocarbons, such as methane, lower olefins, long-chain hydrocarbons, formic acid, methanol and higher alcohols, which are produced by catalytic reactions with various mechanisms. There are still significant challenges associated with the need for an external source of hydrogen, high process temperatures, and the development of active, selective, and stable catalysts that would be suitable for large-scale production. This paper presents results of research on a CO2 utilization method with hydrogen and hydrocarbons production – the transformation of wastes into a source of energy, which allows solving environmental and energy problems. The method described in this paper consists in the interaction of metallic fillers with water saturated with carbon dioxide in a reactor at low (room) temperatures and further analysis of the resulting gas mixture using a chromatograph. Qualitative and quantitative evaluation of the produced gas composition, study of the effect of reaction system volume, filler composition and structure, and process temperature on the reaction product yield are presented. The results of theoretical and experimental analysis of the reactions underlying the process are given, and the economic potential of the proposed laboratory method is evaluated.

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Berahim, Nor Hafizah y Akbar Abu Seman. "CO2 Utilization: Converting Waste into Valuable Products". En SPE Asia Pacific Oil & Gas Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210729-ms.

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Abstract Carbon dioxide capture, utilization, and storage (CCUS), which includes conversion to valuable products, is a complex modern issue with many perspectives. In recent years, the idea of using carbon dioxide (CO2) as a feedstock for synthetic applications in the chemical and fuel sectors via reduction reactions has piqued interest. If the hydrogen is created using a renewable energy source, catalytic CO2 hydrogenation is the most viable and appealing alternative among the existing CO2-recycling solutions. CO2 hydrogenation has many chemical paths depending on the catalyst, and multiple value-added hydrocarbons can be generated. This research looks into a catalyst development for converting high CO2 gas field into methane and alcohols. The study focused on catalytic conversion of CO2 to methane over Ru based catalyst while in the case of alcohols using Cu based catalyst. Both catalysts were synthesized via impregnation techniques where the aqueous precursors’ solution were impregnated on the oxide supports, stirred, filtered and washed. The samples were then dried, ground and calcined. The synthesized catalysts were characterized using various analytical techniques (e.g., TPR, FESEM, N2 adsorption-desorption, XRD) for their physicochemical properties. The catalytic performance in CO2 hydrogenation was performed using a fixed bed reactor at various factors such as temperature, pressure, feed gas ratio and space velocity. The experimental findings indicate that conversion of CO2 to methane over Ru based catalyst resulted in >84% CO2 conversion with 99% methane selectivity in the range of temperature 280 – 320 °C and at atmospheric pressure. In the case of hydrogenation of CO2 to alcohols, the catalytic performance of Cu based catalyst exhibited CO2 conversion of >11% and selectivity towards alcohols, C1 and C2, both at 4% with reaction temperature of 250 °C and pressure 30 bar. These findings revealed that methane could easily be formed from CO2 as compared to alcohol. However, both technology conversions are dependent on the catalyst selection and its’ activity. Process parameters need to be optimized to maximize targeted product formation and suppress the side products.

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Messerle, V. E., A. B. Ustimenko y O. A. Lavrichshev. "Plasma-Fuel Systems for Fuel Preparation, Ignition, Combustion and Gasification". En ASME 2014 Gas Turbine India Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gtindia2014-8124.

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A review of the developed plasmachemical technologies of pyrolysis, hydrogenation, thermochemical treatment for combustion, gasification, radiation-plasma, and complex conversion of solid fuels, including uranium-containing slate coal, and cracking of hydrocarbon gases, is presented. The use of these technologies for obtaining target products (hydrogen, carbon black, hydrocarbon gases, synthetic gas, and valuable components of the coal mineral mass) meet the modern experimental and economic requirements to the power sector, metallurgy and chemical industry. Plasma coal conversion technologies are characterized by a small time of reagents retention in the reactor and a high rate of the original substances conversion to the target products without catalysts. Thermochemical treatment of fuel for combustion is performed in a plasma fuel system, representing a reaction chamber with a plasmatron, while other plasma fuel conversion technologies are performed in a combined plasmachemical reactor of 100 kW nominal power, in which the area of heat release from the electric arc is combined with the area of chemical reactions.

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Informes sobre el tema "Nanocatalysts for Hydrogenation reactions"

Burt, Scott Russell. MRI of Heterogeneous Hydrogenation Reactions Using Parahydrogen Polarization. Office of Scientific and Technical Information (OSTI), enero de 2008. http://dx.doi.org/10.2172/934962.

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Krier, James M. Sum Frequency Generation Studies of Hydrogenation Reactions on Platinum Nanoparticles. Office of Scientific and Technical Information (OSTI), agosto de 2013. http://dx.doi.org/10.2172/1165014.

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