High-pressure Catalytic Kinetics of CO2 Reforming of Methane Over Highly Stable NiCo/SBA-15 Catalyst

Hao Wu 1

Yajin Li 1

Huimin Liu 1,2, Email

Dehua He 1, Email

1 Innovative Catalysis Program, Key Laboratory of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China
2 School of Chemical and Biomolecular Engineering,The University of Sydney, NSW 2006, Australia

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 oC. 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.

High-pressure Catalytic Kinetics of CO2 Reforming of Methane Over Highly Stable NiCo/SBA-15 Catalyst