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
Selective conversion of methane to synthesis gas: Catalysts based on electrochemically modified nickel foam
Alexey G. Dedov,A. S. Loktev,A. V. Shmigel,P. A. Tikhonov,A. E. Lapshin,M. Yu. Arsent’ev,I. E. Mukhin,Vladimir Ivanov,I. I. Moiseev +8 more
TL;DR: In this paper, high thermoconductive, active and selective catalysts based on commercial nickel foam for partial oxidation and dry reforming of methane have been designed, which have been synthesized by subjecting the nickel foam to electrochemical treatment providing the formation of nickel, molybdenum or cobalt oxide or hydroxide particles on the surface of the material.
Dissertation
Production of syngas via dry reforming of methane with carbon dioxide over dolomite supported cobalt-based catalyst
TL;DR: In this paper, a series of cobalt based catalysts were developed with dolomite as support by impregnation method with different types of non-noble metals such as Ce, Ni and La.
Dissertation
Experimental Studies and Modeling of Synthesis Gas Production and Fischer-Tropsch Synthesis
TL;DR: In this article, the influence of process conditions on the production of synthesis gas (H(2) and CO) from model biogas through partial oxidation over a granular Ni-based catalyst was investigated in a partially adiabatic plasma-assisted (nonthermal) Gliding Arc (GlidArc) reactor in a transitional flow regime at a fixed pressure (1 bar) and electric power (0.3 kW).
Journal ArticleDOI
Thermal Aging of Perovskite Based Natural Gas Vehicle Catalysts: Dependency of the Mode of Pd Incorporation
TL;DR: In this paper, the performance of fresh and aged impregnated Pd/LaFeO3 and sol gel LaFe1−xPdxO3 Natural Gas Vehicle Three-Way Catalysts, in powder form and wash-coated on ceramic monolith, have been investigated.
Journal ArticleDOI
Effects of Arc Discharge Mode on the Efficiency of Biogas Reforming in an AC-Pulsed Arc Plasma System
TL;DR: In this article, the effects of arc discharge mode on biogas reforming performance in an AC-pulsed arc plasma system were investigated for different pulse rising times, and the discharge mode changed from the re-strike arc mode to constant arc mode on increasing the pulse rising time from 2 to 5μs at a fixed discharge power.
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.
Journal ArticleDOI
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.
Journal ArticleDOI
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.
Journal ArticleDOI
Microscopic view of epitaxial metal growth: nucleation and aggregation
TL;DR: In this article, the authors reviewed the early stages of epitaxial growth and showed how the growth kinetics can be employed to create well-defined island morphologies and island arrays in a self-organization process.