Готові списки джерел за темами / Catalytic Support - Metal Mediated Catalysis

Добірка наукової літератури з теми "Catalytic Support - Metal Mediated Catalysis"

Автор: Grafiati
Опубліковано: 7 вересня 2023

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Статті в журналах з теми "Catalytic Support - Metal Mediated Catalysis"

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Bennett, Jeffrey A., Bradley A. Davis, Kirill Efimenko, Jan Genzer, and Milad Abolhasani. "Network-supported, metal-mediated catalysis: progress and perspective." Reaction Chemistry & Engineering 5, no. 10 (2020): 1892–902. http://dx.doi.org/10.1039/d0re00229a.

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2

Martín, Cristina del Mar García, José Ignacio Hernández García, Sebastián Bonardd, and David Díaz Díaz. "Lignin-Based Catalysts for C–C Bond-Forming Reactions." Molecules 28, no. 8 (April 16, 2023): 3513. http://dx.doi.org/10.3390/molecules28083513.

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Анотація:
Carbon–carbon (C–C) bond formation is the key reaction in organic synthesis to construct the carbon framework of organic molecules. The continuous shift of science and technology toward eco-friendly and sustainable resources and processes has stimulated the development of catalytic processes for C–C bond formation based on the use of renewable resources. In this context, and among other biopolymer-based materials, lignin has attracted scientific attention in the field of catalysis during the last decade, either through its acid form or as a support for metal ions and metal nanoparticles that drive the catalytic activity. Its heterogeneous nature, as well as its facile preparation and low cost, provide competitive advantages over other homogeneous catalysts. In this review, we have summarized a variety of C–C formation reactions, such as condensations, Michael additions of indoles, and Pd-mediated cross-coupling reactions that were successfully carried out in the presence of lignin-based catalysts. These examples also involve the successful recovery and reuse of the catalyst after the reaction.
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3

Liu, Xin, Xin Zhang, and Changgong Meng. "Coadsorption Interfered CO Oxidation over Atomically Dispersed Au on h-BN." Molecules 27, no. 11 (June 5, 2022): 3627. http://dx.doi.org/10.3390/molecules27113627.

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Similar to the metal centers in biocatalysis and homogeneous catalysis, the metal species in single atom catalysts (SACs) are charged, atomically dispersed and stabilized by support and substrate. The reaction condition dependent catalytic performance of SACs has long been realized, but seldom investigated before. We investigated CO oxidation pathways over SACs in reaction conditions using atomically dispersed Au on h-BN (AuBN) as a model with extensive first-principles-based calculations. We demonstrated that the adsorption of reactants, namely CO, O2 and CO2, and their coadsorption with reaction species on AuBN would be condition dependent, leading to various reaction species with different reactivity and impact the CO conversion. Specifically, the revised Langmuir–Hinshelwood pathway with the CO-mediated activation of O2 and dissociation of cyclic peroxide intermediate followed by the Eley–Rideal type reduction is dominant at high temperatures, while the coadsorbed CO-mediated dissociation of peroxide intermediate becomes plausible at low temperatures and high CO partial pressures. Carbonate species would also form in existence of CO2, react with coadsorbed CO and benefit the conversion. The findings highlight the origin of the condition-dependent CO oxidation performance of SACs in detailed conditions and may help to rationalize the current understanding of the superior catalytic performance of SACs.
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4

Campisi, Sebastiano, Carine Chan-Thaw, and Alberto Villa. "Understanding Heteroatom-Mediated Metal–Support Interactions in Functionalized Carbons: A Perspective Review." Applied Sciences 8, no. 7 (July 17, 2018): 1159. http://dx.doi.org/10.3390/app8071159.

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Анотація:
Carbon-based materials show unique chemicophysical properties, and they have been successfully used in many catalytic processes, including the production of chemicals and energy. The introduction of heteroatoms (N, B, P, S) alters the electronic properties, often increasing the reactivity of the surface of nanocarbons. The functional groups on the carbons have been reported to be effective for anchoring metal nanoparticles. Although the interaction between functional groups and metal has been studied by various characterization techniques, theoretical models, and catalytic results, the role and nature of heteroatoms is still an object of discussion. The aim of this review is to elucidate the metal–heteroatoms interaction, providing an overview of the main experimental and theoretical outcomes about heteroatom-mediated metal–support interactions. Selected studies showing the effect of heteroatom–metal interaction in the liquid-phase alcohol oxidation will be also presented.
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5

Wieghold, S., L. Nienhaus, F. L. Knoller, F. F. Schweinberger, J. J. Shepherd, J. W. Lyding, U. Heiz, M. Gruebele, and F. Esch. "Plasmonic support-mediated activation of 1 nm platinum clusters for catalysis." Physical Chemistry Chemical Physics 19, no. 45 (2017): 30570–77. http://dx.doi.org/10.1039/c7cp04882c.

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Анотація:
Nanometer-sized metal clusters are prime candidates for photoactivated catalysis, based on their unique tunable properties. Under visible light illumination, these non-plasmonic particles can get catalytically activated by coupling to a plasmonic substrate.
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Zhao, Haiyan, Theodore Christensen, Zihan Lin, Annie Lynn, and Liang Tang. "An unusual metal ion configuration in a viral DNA-packaging nuclease active site." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C489. http://dx.doi.org/10.1107/s2053273314095102.

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Анотація:
Nucleic acid metabolism is fundamental to many biological processes. A large class of enzymes such as RNase H, reverse transcriptase, retroviral integrase, topoisomerase, DNA and RNA polymerase, transposase, Holliday-junction resolvase, RNAi slicer Argonaute, and viral DNA-packaging terminase, utilize a common two-metal-ion catalytic mechanism for cleavage or synthesis of nucleic acid chains. Here we report an unusual metal-ion cluster in the active site of the nuclease domain of a viral DNA-packaging terminase unveiled by X-ray structures up to 1.38 Angstrom resolution. Two Mg2+ ions are situated in a coupled octahedral coordination system with liganding oxygen atoms from aspartic acid residues as well as water molecules. The two Mg2+ ions are located within a strikingly short distance of ~2.5 Å, which is unusual given the 1.6 Å atomic radius of Mg2+ and is shorter than previously observed metal-metal distances in metallocluster-containing enzymes or other biological systems. This provides the structural basis for distinguishing Mg2+ from other metal ions such as Ca2+ which are well known to support binding of the nucleic acid substrate but not support catalysis. Such an ultra-short distance between two metal-ions may be essential for generation of a highly positive niche, leading to nucleophilic attack at the phosphodiester bond of DNA. These results have defined the precise chemical configuration of the active site in nucleases using two-metal-ion catalytic mechanism. Moreover, assembly of this two-metal-ion cluster in the viral DNA-packaging terminase is mediated by an adjacent Lys residue, likely serving as a regulatory mechanism for activation of the nuclease activity of the terminase during packaging of viral genome.
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7

Jiang, Haihui, Ligang Gai, and Yan Tian. "Altervalent cation-doped MCM-41 supported palladium catalysts and their catalytic properties." Journal of the Serbian Chemical Society 76, no. 6 (2011): 923–32. http://dx.doi.org/10.2298/jsc100227073j.

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Анотація:
Metal cation-doped MCM-41 (M-MCM-41, M=Al, Ce, Co, V, or Zr) supported Pd catalysts (Pd/M-MCM-41) were prepared by a solution-based reduction method. The catalysts were characterized by Xray diffraction (XRD) analysis, infrared spectroscopy (IR), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and further evaluated by selective hydrogenation of parachloronitrobenzene (p-CNB) in anhydrous ethanol. The metal cationcontaining Pd catalysts can efficiently enhance the selectivity for parachloroaniline (p-CAN). The highest selectivity of 96.5 % in the molar distribution for p-CNB to p-CAN was acquired over Pd (1.8 wt. %)/VMCM- 41 (Si/V=30, molar ratio) catalyst, and the corresponding turnover frequency (TOF) was 1.24?10-2 mol p-CNB mol-1 Pd s-1. Water molecules adsorbed by the support have important effects on both the catalytic activity of the sample and the selectivity for p-CAN. A water molecule-mediated catalytic hydrogenation is discussed.
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8

Wan, Yujia, Yanyan Feng, Decheng Wan, and Ming Jin. "Polyamino amphiphile mediated support of platinum nanoparticles on polyHIPE as an over 1500-time recyclable catalyst." RSC Advances 6, no. 110 (2016): 109253–58. http://dx.doi.org/10.1039/c6ra19013h.

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9

Seth, Jhumur, Prashant Dubey, Vijay R. Chaudhari, and Bhagavatula L. V. Prasad. "Preparation of metal oxide supported catalysts and their utilization for understanding the effect of a support on the catalytic activity." New Journal of Chemistry 42, no. 1 (2018): 402–10. http://dx.doi.org/10.1039/c7nj03753h.

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10

Bo, Guyue, Peng Li, Yameng Fan, Qiang Zhu, Linlin Xia, Yi Du, Shi Xue Dou, and Xun Xu. "Liquid-Metal-Mediated Electrocatalyst Support Engineering toward Enhanced Water Oxidation Reaction." Nanomaterials 12, no. 13 (June 23, 2022): 2153. http://dx.doi.org/10.3390/nano12132153.

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Анотація:
Functional and robust catalyst supports are vital in the catalysis field, and the development of universal and efficient catalyst support is essential but challenging. Traditional catalyst fabrication methods include the carbonization of ordered templates and high−temperature dehydration. All these methods involve complicated meso−structural disordering and allow little control over morphology. To this end, a eutectic GaInSn alloy (EGaInSn) was proposed and employed as an intermediate to fabricate low−dimensional ordered catalyst support materials. Owing to the lower Gibbs free energy of Ga2O3 compared to certain types of metals (e.g., Al, Mn, Ce, etc.), we found that a skinny layer of metal oxides could be formed and exfoliated into a two−dimensional nanosheet at the interface of liquid metal (LM) and water. As such, EGaInSn was herein employed as a reaction matrix to synthesize a range of two−dimensional catalyst supports with large specific surface areas and structural stability. As a proof−of-concept, Al2O3 and MnO were fabricated with the assistance of LM and were used as catalyst supports for loading Ru, demonstrating enhanced structural stability and overall electrocatalytic performance in the oxygen evolution reaction. This work opens an avenue for the development of functional support materials mediated by LM, which would play a substantial role in electrocatalytic reactions and beyond.
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Дисертації з теми "Catalytic Support - Metal Mediated Catalysis"

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Hajar, Yasmine. "Effect of Electrochemical Promotion and Metal-Support Interaction on Catalytic Performance of Nano-catalysts." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39701.

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Анотація:
In heterogeneous catalysis, promoting the activity of the catalytic metals is long known as an important method to make a process more efficient and viable. Noble metals have been promoted classically by a chemical coverage of an ionic solution on the surface of the catalyst or using inert support, e.g., silica or alumina, allowing an increase of the dispersion of the catalyst. Therefore, new methods of promotion needed to be better explored to improve the efficiency of metal and metal oxide catalysts. One way of enhancing the catalyst’s activity is to disperse the noble metal at the nanoscale using an active type of support that is ion-conducting. Not only lattice ions can be exchanged with the surface of the nanoparticles but it can also engage in the oxidation reaction on the surface, resulting in what is known as metal-support interaction (MSI). Another method of improving the catalytic activity is to polarize the catalyst, allowing ions to migrate from a solid electrolyte to the gas-exposed surface, in a phenomenon known as electrochemical promotion of catalysis (EPOC). The change in the ions concentration on the surface would change the adsorption energy of the gaseous reactants and enhance or supress the catalytic rate. In this thesis, the effect of supporting nanoparticles of noble and non-noble metal (oxides) (Pt, Ru, Ir, Ni) was studied for the case of ionic and ionic-electronic conducting supports (CeO2, TiO2, YSZ). The enhancement in their catalytic rate was found and correlated to an electrochemical property, the exchange current density. Then, using isotopically-labeled oxygen, the oxygen exchange ability of the conductive oxides was evaluated when supporting Ir and Ru nanoparticles and correlated with the results from C3H8 isotopic oxidation reaction, which showed the extent of involvement of oxygen from the support as carried by the isotopically-labeled CO2 produced. Following this, electrochemical promotion of catalysis experiments were performed for different reactant/catalyst systems (C2H4 - Pt, Ru; C3H8 - Pt; CH4 - Pd, Ni9Pd). In the first system, the main outcome was the functional equivalence found for the MSI and EPOC effect in promoting the catalysts as experiments were performed at different temperatures, reactants partial pressures and polarization values. In the case of C3H8/Pt, the novel dispersion of Pt on an intermediate supporting layer (LSM/GDC) was found as a feasible method to obtain long stability of the catalyst while electrochemically promoting the rate of reaction. For CH4 oxidation, the polarization of the Pd nanoparticles showed continuous oxidation of the bulk of the catalyst resulting in a continuous increase of the catalytic rate. The Ni9Pd synthesized in a way to form a core/double-shell layer of Ni/Pd resulted in an enhanced catalytic rate and enhanced stability compared to stand-alone Pd. And lastly, to comprehend the ions’ effect in the electrochemical promotion and the non-Faradaic nature of the phenomena, density-functional theory (DFT) modeling was used to demonstrate the increase of the heat of adsorption of reactants depending on their electronegative/positive nature.
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Частини книг з теми "Catalytic Support - Metal Mediated Catalysis"

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Codolá, Zoel, Julio Lloret-Fillol, and Miquel Costas. "Catalytic Water Oxidation: Water Oxidation to O2 Mediated by 3d Transition Metal Complexes." In Non-Noble Metal Catalysis, 425–51. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527699087.ch16.

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2

"2.6 C—H Functionalization Catalyzed by Low-Valent Cobalt." In Base-Metal Catalysis 2. Stuttgart: Georg Thieme Verlag KG, 2023. http://dx.doi.org/10.1055/sos-sd-239-00042.

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Анотація:
AbstractThis review summarizes representative examples of catalytic C—H functionalization reactions mediated by low-valent cobalt complexes. Catalysts generated by the reduction of cobalt(II) or cobalt(III) precatalysts in the presence of appropriate supporting ligands have been demonstrated to promote a variety of alkylation, alkenylation, and arylation reactions of aromatic C(sp2)—H bonds, often with the assistance of directing groups. Well-defined cobalt(0) and cobalt(–I) complexes have also proved to catalyze some of these reactions. Low-valent cobalt complexes supported by bis(phosphinomethyl)pyridine, terpyridine, and diimine ligands have been identified as viable catalysts for the borylation of C(sp2)—H and C(sp3)—H bonds, where the cobalt catalysts exhibit unique site selectivity compared with well-established iridium catalysts. Other reactions such as 1,4-cobalt migration, hydroacylation, and C—H activation involving cobaltacyclopentene intermediates are also discussed.
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3

Santana, V. C. S., L. S. Munaretto, and E. C. de Lucca, Jr. "26.1.2.5 Synthesis of Ketones by Oxidation of Alkanes (Update 2022)." In Knowledge Updates 2022/1. Stuttgart: Georg Thieme Verlag KG, 2022. http://dx.doi.org/10.1055/sos-sd-126-00120.

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Анотація:
AbstractThis chapter is an update to Science of Synthesis Section 26.1.2, which included the synthesis of ketones by oxidation of alkanes. This contribution is focused on reports published during the period 2007–2020 that describe the synthesis of ketones by transition-metal catalysis, photochemically and electrochemically mediated methods, as well as the use of supported catalysts and metal-free oxidation of alkanes.
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4

B. Gudimetla, Vittal, Bony P. Joy, and Sudeep Paul. "Imidazolium-Based N-Heterocyclic Carbenes (NHCs) and Metal-Mediated Catalysis." In Carbene. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.102561.

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Анотація:
The journey of “carbenes” is more than a century old. It began with a curiosity to understand a then less familiar carbon moiety in its divalent state. It reached an important milestone in the form of 1,3-imidazolium-based N-heterocyclic carbenes (NHCs), where the quest for bottleable carbenes was achieved through simple and elegant synthetic routes. The properties of these carbenes were finely tunable through the steric and electronic factors via chemical modifications. Thus, it became one of the unique and extensively studied ligands for its properties and applications. This chapter first briefs about structural details of NHCs and different synthetic routes for the preparation of imidazolium-based NHC precursors. The later section focuses on various methods for characterizing the steric and electronic properties of these ligands and their metal intermediates, which are crucial for developing efficient catalytic processes. Finally, the chapter concludes with NHC-metal-mediated catalytic applications and its immediate challenges.
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5

Yazawa, Y., H. Yoshida, N. Takagi, N. Kagi, S. Komai, A. Satsuma, Y. Murakami, and T. Hattori. "Acid strength of support materials as a factor controlling catalytic activity of noble metal catalysts for catalytic combustion." In Studies in Surface Science and Catalysis, 2189–94. Elsevier, 2000. http://dx.doi.org/10.1016/s0167-2991(00)80793-4.

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"Catalytic Hydrogenation of Cinnamaldehyde: The Effects of Support and Supported Metal on Activity and Selectivity." In Catalysis of Organic Reactions, 442–55. CRC Press, 2002. http://dx.doi.org/10.1201/9780203911013-34.

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7

Baddeley, Christopher J. "Nanoscience." In Contemporary Catalysis: Science, Technology, and Applications, 115–30. The Royal Society of Chemistry, 2017. http://dx.doi.org/10.1039/9781849739900-00115.

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Анотація:
Metal nanoparticles supported on high surface area oxide materials form the active component of many industrial heterogeneous catalysts. This chapter examines how the structural, electronic and catalytic properties of metal nanoparticles differ from those exhibited by bulk metals. In addition, the influence of the oxide support on the activity and/or selectivity of a catalytic reaction is discussed.
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Kumbhar, P. S., and R. A. Rajadhyaksha. "Liquid phase catalytic hydrogenation of benzophenone: Role of metal support interaction, bimetallic catalysts, solvents and additives." In Studies in Surface Science and Catalysis, 251–58. Elsevier, 1993. http://dx.doi.org/10.1016/s0167-2991(08)63327-3.

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Tarasankar, Pal, and Praharaj Snigdhamayee. "Size and Shape Selective Synthesis of Metal Nanoparticles by Seed-Mediated Method and the Catalytic Activity of Growing Microelectrodes (GME) and Fully Grown Microelectrodes (FGME)." In Metal Nanoclusters in Catalysis and Materials Science, 419–25. Elsevier, 2008. http://dx.doi.org/10.1016/b978-044453057-8.50032-5.

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Liao, Guangjian, and Guochuan Yin. "Bio-Inspired Dioxygen Activation and Catalysis By Redox Metal Complexes." In Oxygen Atom Transfer Reactions, 39–61. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815050929123010006.

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Анотація:
In nature, redox enzymes mediated dioxygen activation with oxidations proceeds smoothly and highly selectively under ambient temperature, whereas in the chemical industry, versatile oxidations are commonly performed at elevated temperature, which leads to the occurrence of radical chain process, thus causing low product selectivity and environmental pollution. This chapter will first introduce the strategies of enzymes including P450s, methane monooxygenase, dioxygenases in dioxygen activation and catalysis, thus illustrating how enzymes activate dioxygen and selectively transfer the resulting active oxygen to their substrates. Then, inspired by enzymatic dioxygen activation, the progress in biomimetic dioxygen activation with related catalytic oxidations by synthetic redox metal complexes will be presented, and its current challenges will be discussed as well. Finally, a recent new strategy for dioxygen activation and catalysis, that is, Lewis acid promoted dioxygen activation by redox metal complexes, will be introduced; this new strategy may have more closely biomimicked enzymatic dioxygen activation than those traditional strategies, thus shedding new light on catalyst design for industrial oxidations.
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Тези доповідей конференцій з теми "Catalytic Support - Metal Mediated Catalysis"

1

Brus, Grzegorz, Zygmunt Kolenda, Shinji Kimijima, and Janusz S. Szmyd. "An Analysis of Heat Transfer Processes in an Internal Indirect Reforming Type Solid Oxide Fuel Cell." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22785.

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Анотація:
This paper presents experimental and numerical studies on the fuel reforming process on an Ni/YSZ catalyst. Nickel is widely known as a catalyst material for Solid Oxide Fuel Cells. Because of its prices and catalytic properties, Ni is used in both electrodes and internal reforming reactors. However, using Ni as a catalyst carries some disadvantages. Carbon formation is a major problem during a methane/steam reforming reaction based on Ni catalysis. Carbon formation occurs between nickel and metal-support, creating fibers which damage the catalytic property of the reactor. To prevent carbon deposition, the steam-to-carbon ratio is kept between 3 and 5 throughout the entire process. To optimize the reforming reactors, detailed data about the entire reforming process is required. In the present paper kinetics of methane/steam reforming on the Ni/YSZ catalyst was experimentally investigated. Measurements including different thermal boundary conditions, the fuel flow rate and the steam-to-methane ratios were performed. The reforming rate equation derived from experimental data was used in the numerical model to predict synthetic gas composition at the outlet of the reformer.
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