Catalytic Ignition and Pressure Dependence of Methane/Air Combustion over Palladium Oxide
The catalytic ignition and kinetics of CH4/air oxidation over PdO were studied using wire microcalorimetry. Ignition temperatures and heat release rates were measured and global kinetic parameters were extracted. Key reactions rates were amended and a detailed surface reaction scheme for atmospheric pressure was proposed. In a subsequent step, the pressure dependence of CH4/air catalytic oxidation over PdO was investigated in the range 1-12 bar in a channel-flow catalytic reactor. In situ Raman measurements of major gas phase species concentrations assessed the heterogeneous reactivity, while planar laser induced fluorescence (LIF) of the OH radical monitored homogeneous combustion. Simulations were performed using a 2-D code with detailed hetero-/homogeneous reaction mechanisms. Comparisons between Raman measured and numerically predicted profiles of major species allowed for the construction of a global catalytic step valid for 1-12 bar. The CH4 catalytic reaction rate had an overall pressure dependence ∼p1-n where the exponent n was itself a monotonically increasing function of pressure. This resulted in non-monotonic pressure dependence, a behavior in stark contrast to other noble metals such at Pt and Rh.
R. Sui et al., "Catalytic Ignition and Pressure Dependence of Methane/Air Combustion over Palladium Oxide," Proceedings of the 2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute (2018, State College, PA), The Pennsylvania State University, Mar 2018.
2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018 (2018: Mar. 4-7, State College, PA)
Mechanical and Aerospace Engineering
Keywords and Phrases
Catalytic ignition; Methane total oxidation over PdO; Pressure dependence of catalytic reactivity
Article - Conference proceedings
© 2018 Eastern States Section of the Combustion Institute, All rights reserved.
01 Mar 2018