Catalytic combustion of methane over Pd/Al2O3 in amonolithis reactor: kinetic study

LOPEZ, EDUARDO; GIGOLA, CARLOS; BORIO, DANIEL; BUCALA, VERONICA

STUDIES IN SURFACE SCIENCE AND CATALYSIS

ELSEVIER SCIENCE SA

Año: 2001 vol. 133 p. 625 - 630

0167-2991

This paper focuses on the kinetic study of the methane combustion over a Pd/~'-A1203 catalyst deposited on a cordierite monolithic structure. The experiments were performed in an integral reactor, and the operating conditions were chosen to adequately represent the operation of a domestic-scale catalytic heater, i.e. relatively high volumetric flowrates and high methane molar ~actions. The experimental data together with an appropriate model for the integral reactor were used to estimate the intrinsic kinetic parameters for a power law type reaction. For the laboratory catalyst, internal mass transfer limitations become appreciable for temperatures higher than 430~ A heterogeneous reactor model, which includes the evaluation of the methane concentration gradient inside the washcoat, allowed to reproduce with high accuracy the laboratory data.