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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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Ni-based bimetallic heterogeneous catalysts for energy and environmental applications
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Methane Activation by Heterogeneous Catalysis
Raimund Horn,Robert Schlögl +1 more
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Hydrogen: A brief overview on its sources, production and environmental impact
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O2 Activation by Metal Surfaces: Implications for Bonding and Reactivity on Heterogeneous Catalysts
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References
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Journal ArticleDOI
Highly stable Ni catalyst supported on Ce–ZrO2 for oxy-steam reforming of methane
TL;DR: In this paper, Ni/Ce-ZrO2 was used in the stoichiometric steam reforming of methane (H2O/CH4 = 1) and gave enhanced CH4 conversion (99.1%) at 750 °C and was maintained for 100 h.
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Highly active and coking resistant Ni/CeO2–ZrO2 catalyst for partial oxidation of methane
Shan Xu,Xiaolai Wang +1 more
TL;DR: In this article, Ni and CeO 2 -ZrO 2 solid solution were successfully prepared by the co-precipitation method for partial oxidation of methane by using N 2 adsorption/desorption, CO chemisorption and X-ray diffraction (XRD) techniques.
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Partial oxidation of methane to syngas at high space velocities over Rh-coated spheres
Keith L. Hohn,Lanny D. Schmidt +1 more
TL;DR: In this article, the effect of space velocity on the partial oxidation of methane using different support geometries has been studied and the differences between monoliths and spheres are discussed in order to understand why spheres give superior results.
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Specific performance of silica-coated Ni catalysts for the partial oxidation of methane to synthesis gas
TL;DR: In this paper, the Ni metal covered with silica (coat-Ni) showed excellent catalytic performance for the partial oxidation of methane into synthesis gas, whereas Ni metal catalyst supported on silica was rapidly deactivated for the reaction.
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Novel and ideal zirconium-based dense membrane reactors for partial oxidation of methane to syngas
TL;DR: In this article, a novel and ideal dense catalytic membrane reactor for the reaction of partial oxidation of methane to syngas (POM) was constructed from the stable mixed conducting perovskite material of BaCo0.4Fe 0.4Zr 0.2O3−δ and the catalyst of LiLaNiO/γ-Al 2O3.