Kinetic and Stability Studies of Ru/La2O3 Used in the Dry Reforming of Methane

C. CARRARA, J. MUNERA, E. A. LOMBARDO, L. M. CORNAGLIA

TOPICS IN CATALYSIS

Springerlink

Año: 2008 vol. 51 p. 98 - 106

1022-5528

The catalytic activity toward hydrogen productionthrough the dry reforming of methane wasdetermined for Ru supported on lanthanum oxide. Thecatalyst remained stable for more than 80 h in the 823–903 K temperature range and reactant partial pressure ratio(PCO2=PCH4 ) equal to unity. However, a significant deactivationwas observed during the kinetic measurements when the catalyst was exposed to PCO2/PCH4 >1 at 823 K. In order to establish why the catalyst deactivated, the Ru reactivity in reductive and CO2 rich atmospheres was studied by in situ LRS and XPS spectroscopies. The partial re-oxidation of metallic Ru could be one of the factors that produce the catalyst deactivation. To perform the kinetic measurements, the temperature range and the partial pressure ratios were selected within the window where the Ru catalyst was stable. The kinetic data and supporting spectroscopic evidence is consistent with a mechanism in whichthe metal and the oxide play key roles in decomposing the paraffin and activating the CO2, respectively.