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
Tailored Noble Metal Nanoparticles on γ‐Al2O3 for High Temperature CH4 Conversion to Syngas
Claudia Berger-Karin,Michael Sebek,Marga-Martina Pohl,Ursula Bentrup,Vita A. Kondratenko,Norbert Steinfeldt,Evgenii V. Kondratenko +6 more
TL;DR: In this article, a simple deposition of tailored Rh or Pt nanoparticles (NP) on γ-Al2O3 results in active, selective, and stable catalysts for partial oxidation of methane (POM) to syngas.
Journal ArticleDOI
Catalytic Partial Oxidation of Methane over Perovskite La4Sr8Ti12O38-δ Solid Oxide Fuel Cell (SOFC) Anode Material in an Oxygen-Permeable Membrane Reactor
TL;DR: In this paper, the partial oxidation of methane to syngas over perovskite La4Sr8Ti12O38-δ solid oxide fuel cell (SOFC) anode material was studied with a Ce0.8Sm0.2CrO3δ dual-phase composite membrane reactor.
Journal ArticleDOI
Methane Activation by Diatomic Molybdenum Carbide Cations
TL;DR: Insight is provided into the C-H bond activation and C-C coupling involved in methane transformation over molybdenum carbide-based catalysts, which leads to much lower energy barriers and more stable intermediates.
Journal ArticleDOI
Pt doping triggers growth of TiO2 nanorods: nanocomposite synthesis and gas-sensing properties
Mauro Epifani,Teresa Andreu,Reza R. Zamani,Jordi Arbiol,Jordi Arbiol,Elisabetta Comini,Pietro Siciliano,Guido Faglia,Joan Ramon Morante +8 more
TL;DR: In this article, a rod-shaped anatase nanocrystals were used for preparing ethanol-sensing devices, and the Pt addition remarkably improved the response with respect to pure TiO2 sensors and electrical characterization of the sensors helped in establishing that the effect of Pt was due to spillover rather than electronic sensitization.
Journal ArticleDOI
Methane partial oxidation over a LaCr0.85Ru0.15O3 catalyst: Characterization, activity tests and kinetic modeling
Tommaso Melchiori,L. Di Felice,N. Mota,Rufino M. Navarro,J.L.G. Fierro,van M Martin Sint Annaland,Fausto Gallucci +6 more
TL;DR: In this paper, a new LaCr 0.85 Ru 0.15 O 3 perovskite-type catalyst for CH 4 partial oxidation with a high activity and selectivity for syngas with good thermal stability and resistance against coking has been developed.
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Microscopic view of epitaxial metal growth: nucleation and aggregation
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