Kinetics and reaction pathway of the CO2 Reforming of Methane on Rh supported on lanthanum based solid

JOHN F. MÚNERA, SILVIA IRUSTA, LAURA M. CORNAGLIA, EDUARDO A. LOMBARDO, DEBORAH VARGAS CESAR, MARTIN SCHMAL

JOURNAL OF CATALYSIS

Elsevier

Año: 2006 vol. 245 p. 25 - 34

0021-9517

Rh/La2O3 are very stable catalysts for the dry reforming of methane. To understand its catalytic behavior, this system was thoroughly characterized using a battery of instrumental techniques: XRD, LRS, DRIFTS and XPS. The data obtained with the fresh calcined and reduced solids during reaction and after use, both at the volumetric and surface level, led to a satisfactory description of the working catalyst that in turn suggested a possible reaction mechanism. It is proposed that the slow steps are both the decomposition of methane (C + 2H2) and the reaction of the carbon species left on the surface with the oxycarbonates that are present in the working catalyst. The kinetic data obtained varying the reactants partial pressures between 2.5 and 40 kPa in the temperature range of 823-903 K is well fitted by the kinetic equation derived from the proposed reaction mechanism.