Abstract
Temporal Analysis of Products (TAP) investigation on Natural Gas-fueled Vehicle (NGV) catalysts provides information related to the nature of reaction steps involved over noble metals and at the metal-support interface. The determination of accurate kinetic parameters for methane adsorption from single pulse experiments and subsequent investigation of sequential surface reactions from alternative CH4/O2 pulse experiments is the first step toward the establishment of relevant structure/activity relationships which can highlight the importance of the metal/support interface on freshly-prepared and aged single palladium based catalysts.
Highlights
AND SCIENTIFIC BACKGROUNDTemporal Analysis of Products (TAP) reactors allow qualitative and quantitative characterization of the kinetics of elementary steps such as adsorption, surface reactions, and diffusion processes on a wide variety of catalysts
This paper offers a quantitative view of the real impact of the metal/support interface based on a precise determination of kinetic constants from modeling single pulse experiments (SP) experiments taking into account the peculiar porous properties of the materials
The initial fast process is not accompanied with a parallel CO formation that underlines the predominant CH4 decomposition to gaseous H2 and chemisorbed carbidic species (Cads) on Pd active centers described in Scheme 1
Summary
AND SCIENTIFIC BACKGROUNDTemporal Analysis of Products (TAP) reactors allow qualitative and quantitative characterization of the kinetics of elementary steps such as adsorption, surface reactions, and diffusion processes on a wide variety of catalysts. The determination of accurate kinetic parameters for methane adsorption from single pulse experiments and subsequent investigation of sequential surface reactions from alternative CH4/O2 pulse experiments is the first step toward the establishment of relevant structure/activity relationships which can highlight the importance of the metal/support interface on freshly-prepared and aged single palladium based catalysts.
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