Hydrogen assisted catalytic combustion of methane on platinum

• Published in: Catalysis today Vol. 59; no. 1; pp. 141 - 150
• Main Authors: Deutschmann, O, Maier, L.I, Riedel, U, Stroemman, A.H, Dibble, R.W
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 10.06.2000; Elsevier Science
• Subjects: Catalysis; Catalytic combustion; Catalytic ignition; Catalytic reactions; Chemistry; Exact sciences and technology; General and physical chemistry; Numerical simulation; Reaction kinetics; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Catalytic ignition; Numerical simulation; Catalytic combustion; Reaction kinetics; Methane; Heterogeneous catalysis; Hydrocarbon; Honeycomb structure; Hydrogen; Platinum; Transition metal; Kinetics; Supported catalyst
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/S0920-5861(00)00279-0

The objective of this paper is to study hydrogen assisted catalytic combustion of methane on platinum experimentally and numerically. In the experiment, we measure the exit temperatures of methane/hydrogen/air mixtures flowing at atmospheric pressure through platinum coated honeycomb channels. A single channel of this monolith is investigated numerically by a two-dimensional Navier–Stokes simulation including an elementary-step surface reaction mechanism. Furthermore, a one-dimensional time-dependent simulation of a stagnation flow configuration is performed to elucidate the elementary processes occurring during catalytic ignition in the mixtures studied. The dependence of the hydrogen assisted light-off of methane on hydrogen and on methane concentrations is discussed. The light-off is primarily determined by the catalyst temperature that is a result of the heat release due to catalytic hydrogen oxidation. Increasing hydrogen addition ensures light-off, decreasing hydrogen addition requires an increasing methane feed for light-off.