Journal ArticleDOI
A review of catalytic partial oxidation of methane to synthesis gas with emphasis on reaction mechanisms over transition metal catalysts
Reads0
Chats0
TLDR
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
More filters
Journal ArticleDOI
Ni-based bimetallic heterogeneous catalysts for energy and environmental applications
TL;DR: A detailed overview of the development of nickel-based bimetallic catalysts for energy and environmental applications is provided in this article, where a detailed account is provided on the utilization of these systems in the catalytic reactions related to energy production and environmental remediation.
Journal ArticleDOI
Methane Activation by Heterogeneous Catalysis
Raimund Horn,Robert Schlögl +1 more
TL;DR: In this article, the authors present a review of recent results and developments in heterogeneous catalytic methane conversion to synthesis gas, hydrogen cyanide, ethylene, methanol, formaldehyde, methyl chloride, methyl bromide and aromatics.
Journal ArticleDOI
The Direct Catalytic Oxidation of Methane to Methanol-A Critical Assessment.
TL;DR: Mhanol protection is identified as being indispensable for future research on homogeneous and heterogeneous catalysis by establishing the severe limitations related to the direct catalytic synthesis of methanol from methane.
Journal ArticleDOI
Hydrogen: A brief overview on its sources, production and environmental impact
TL;DR: In this paper, a brief overview of availability of hydrogen, its properties and possible sources and its production methods, and its relationship with renewable energy utilisation, environment and climate is presented.
Journal ArticleDOI
O2 Activation by Metal Surfaces: Implications for Bonding and Reactivity on Heterogeneous Catalysts
TL;DR: Trends in the activation of O2 on transition metal surfaces are discussed, and various O2 adsorption states are described in terms of both electronic structure and geometry.
References
More filters
Book ChapterDOI
Partial Oxidation of Methane to Syngas over NiO/γ-Al2O3 Catalysts Prepared by the Sol-Gel Method
Journal ArticleDOI
Influence of the Sol-Gel Method on a NiO/Al2O3 Catalyst for CH4/O2 to Syngas Reaction
TL;DR: In this article, NiO/γ-Al2O3 catalysts were prepared by impregnation and the sol-gel method and the sintering and loss of nickel, carbon deposition and 80 h life-test for POM reaction over the catalyst were investigated.
Book ChapterDOI
Partial Oxidation of Methane at High Temperatures Over Platinum and Rhodium Monolith Catalysts.
TL;DR: In this paper, the influence of contact time, nature of the metal and of the support was investigated in the partial oxidation of methane at temperatures between 800 and 1100 °C.
Book ChapterDOI
Partial oxidation of methane to synthesis gas in a dual catalyst bed system combining irreducible oxide and metallic catalysts
TL;DR: In this article, the dual-bed concept combines these two catalysts and demonstrates that synthesis gas with an equilibrium composition can be produced at high GHSV, where the exposure of metal catalyst to O2 in the second catalyst bed is avoided because oxygen is converted completely in the first catalyst bed.
Journal ArticleDOI
Monolithic reactors for experimental studies of the catalytic partial oxidation of methane to synthesis gas
TL;DR: In this paper, two different impregnation methods for making Pt and Rh (and Ni) monoliths are described and discussed at conditions with incomplete conversion of O2 and with product distributions far from equilibrium.