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
Citations
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PARTIAL OXIDATION OF METHANE TO SYNTHESIS GAS OVER Ni/ γ-Al2O2 CATALYSTS: THE EFFECT OF THE STRUCTURE AND THE PRE-TREATMENT OF THE SUPPORT ON THE CATALYSTS’ PERFORMANCE
TL;DR: In this article , the effect of the alumina support preparation and pretreatment, and selected metal dopants on the Ni-support interaction, coke formation, and catalytic activity was studied.
Journal ArticleDOI
Additive effect of Ce, Mo and K to nickel-cobalt aluminate supported solid oxide fuel cell for direct internal reforming of methane
TL;DR: The Ni-CoAl2O4 supported button cells showed little degradation with operating time, as a result of higher resistance against carbon deposition, whereas the Ni-YSZ supported cell deactivates quickly and suffers fracture in 50 h as discussed by the authors.
Journal Article
Computer-Aided Design of a Non-Isothermal Plug Flow Reactor for Non-Catalytic Partial Oxidation of Methane to Synthesis Gas
TL;DR: In this paper, a non-catalytic plug flow (NFP) non-isothermal plug flow nuclear reactor was designed for the NOP of methane to synthesis gas using MathLab and SimuLink 7.5 to determine optimum values/range of the functional parameters.
Book ChapterDOI
Partial oxidation process for syngas production
TL;DR: In this paper , the authors discuss the catalytic partial oxidation of various types of hydrocarbons focusing on methane and its reaction kinetics, and a brief review of two categories of catalysts, containing noble and non-noble catalysts is also presented.
References
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Journal ArticleDOI
CO2 Reforming of CH4
TL;DR: Although technological practice should minimize environmental impact, this is not always economically feasible as mentioned in this paper, and during the past decade, there has been increasing global concern over the environmental impact of technology.
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Kinetics and Selectivity of the Fischer–Tropsch Synthesis: A Literature Review
TL;DR: In this article, a critical review of the kinetics and selectivity of the Fischer-Tropsch synthesis (FTS) is given, focusing on reaction mechanisms and kinetics.
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Steam Reforming and Graphite Formation on Ni Catalysts
Hanne Skov Bengaard,Jens K. Nørskov,Jens Sehested,Clausen Bjerne Steffen,L.P. Nielsen,A.M. Molenbroek,Jens R. Rostrup-Nielsen +6 more
TL;DR: Based on density functional theory calculations, kinetic measurements, microkinetic and Monte Carlo simulations, thermogravimetric analysis (TGA) experiments, extended X-ray absorption spectroscopy (EXAFS) measurements, and experimental results from the literature, this paper presented a detailed and comprehensive mechanistic picture of the steam reforming process on a Ni catalyst.
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Production of Syngas by Direct Catalytic Oxidation of Methane
TL;DR: Rhodium was considerably superior to platinum in producing more H2 and less H2O, which can be explained by the known chemistry and kinetics of reactants, intermediates, and products on these surfaces.
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Microscopic view of epitaxial metal growth: nucleation and aggregation
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