Hits:

Indexed by:期刊论文

Date of Publication:2013-04-01

Journal:REACTION KINETICS MECHANISMS AND CATALYSIS

Included Journals:SCIE、EI

Volume:108

Issue:2

Page Number:459-472

ISSN No.:1878-5190

Key Words:Nickel catalyst; Olivine; Tar; Biomass gasification; Steam reforming

Abstract:Ni catalysts supported on modified olivine (MO), which were prepared by moulding olivine powder with the addition of calcium aluminate cement and other agents, were investigated for their anti-coking ability in the steam reforming of benzene as biomass gasification tar model compound compared with traditional Ni-olivine catalyst. Coke deposition upon the catalysts was determined by thermogravimetry and their regeneration kinetics data were calculated according to coke combustion. It was found that the modified supports had higher specific surface area and more porous structure, resulting in better dispersion of Ni particles of about 24 nm diameter. As a result, the Ni-MO catalysts showed 30 % higher activity than Ni-olivine catalyst at the same reaction conditions. Furthermore, they were proved to inhibit coke deposition and be more easily regenerated according to the decarbonization kinetics analysis, especially for the catalyst supported on the MO with charcoal and MgO addition, whose coke-burning activation energy was 71.1 kJ/mol, much less than 180.2 kJ/mol for Ni-olivine.