Journal ArticleDOI
A review of catalytic partial oxidation of methane to synthesis gas with emphasis on reaction mechanisms over transition metal catalysts
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In this article, an extensive table on contributions to catalytic partial oxidation of methane over transition metal catalysts in the literature is provided, and both theoretical and experimental evidence pointing to inherent differences in the reaction mechanism over transition metals.Abstract:
Catalytic partial oxidation of methane has been reviewed with an emphasis on the reaction mechanisms over transition metal catalysts. The thermodynamics and aspects related to heat and mass transport is also evaluated, and an extensive table on research contributions to methane partial oxidation over transition metal catalysts in the literature is provided. Presented are both theoretical and experimental evidence pointing to inherent differences in the reaction mechanism over transition metals. These differences are related to methane dissociation, binding site preferences, the stability of OH surface species, surface residence times of active species and contributions from lattice oxygen atoms and support species. Methane dissociation requires a reduced metal surface, but at elevated temperatures oxides of active species may be reduced by direct interaction with methane or from the reaction with H, H2, C or CO. The comparison of elementary reaction steps on Pt and Rh illustrates that a key factor to produce hydrogen as a primary product is a high activation energy barrier to the formation of OH. Another essential property for the formation of H2 and CO as primary products is a low surface coverage of intermediates, such that the probability of O–H, OH–H and CO–O interactions are reduced. The local concentrations of reactants and products change rapidly through the catalyst bed. This influences the reaction mechanisms, but the product composition is typically close to equilibrated at the bed exit temperature.read more
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Journal ArticleDOI
Thermal effects and bifurcations in gas phase catalytic partial oxidations
Vemuri Balakotaiah,David West +1 more
TL;DR: In this paper, an overview of the bifurcations and the impact of various design and operating conditions on the yield (selectivity) to desired products in both laboratory and commercial scale reactors in which partial oxidations are carried out.
Journal ArticleDOI
Mesoporous nanostructured Ni/MgAl2O4 catalysts: Highly active and stable catalysts for syngas production in combined dry reforming and partial oxidation
TL;DR: In this paper, the combination of dry reforming and partial oxidation of methane on nickel catalysts supported on mesoporous MgAl2O4 was investigated, where the support was prepared by a facile sol-gel route using propylene oxide as a gelation agent.
Journal ArticleDOI
Partial oxidation of methane over SiO2 supported Ni and NiCe catalysts
Atefeh Emamdoust,V. La Parola,Giuseppe Pantaleo,Maria Luisa Testa,S. Farjami Shayesteh,Anna Maria Venezia +5 more
TL;DR: Nickel and nickel-ceria catalysts supported on high surface area silica, with 6 ¾wt% Ni and 20 ¾% CeO2 were prepared by microwave assisted (co) precipitation method as discussed by the authors.
Journal ArticleDOI
Theoretical study of the crystal plane effect and ion-pair active center for C-H bond activation by Co3O4 nanocrystals
TL;DR: In this article, density functional theory (DFT) calculations were performed to study the activation of the C-H bond of methane on the (001) and (011) planes of Co3O4.
Journal ArticleDOI
Adsorption of Pd on the Cu(1 1 1) surface and its catalysis of methane partial oxidation: A density functional theory study
TL;DR: In this paper, a single atom alloy configuration of a Pd atom adsorbed on Cu (1.1) surface is proposed (A-Pd/Cu(1.5) ).
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Journal ArticleDOI
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Microscopic view of epitaxial metal growth: nucleation and aggregation
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