High-pressure Catalytic Kinetics of CO Reforming of Methane Over Highly Stable NiCo/SBA-15 Catalyst

Abstract

Investigating the kinetic behaviors of catalysts in the reaction of CO2 reforming of CH4 (CRM) under industrially practical pressures is of great significance for designing stable catalysts for its industrialization. This study explores the kinetic behavior of 4.5Ni0.5Co/SBA-15-CD, a stable catalyst for pressurized CRM (2000 kPa), at a continuous flow-type fixed-bed quartz tube lining-Inconel tubular reactor under kinetically controlled conditions. The kinetic measurements suggested that the forward reaction rates were monotonically increasing with the partial pressures of CH4(200 - 400 kPa), and independent of the partial pressures of CO2 (100 - 300 kPa) over 4.5Ni0.5Co/SBA-15 at 2000 kPa total pressure and 620-660 °C. The trace Co enriched on the outmost surface of NiCo particles of 4.5Ni0.5Co/SBA-15 facilitated the adsorption of co-reactant, and the decomposition of methane was the sole kinetically relevant step. Apparent activation energy of CRM reaction at high pressure measured on 4.5Ni0.5Co/SBA-15 was 106.5 kJ mol-1 at total pressure of 2000 kPa.