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Steam reforming of the aqueous fraction of bio-oil over structured Ru/MgO/Al2O3 catalysts

Steam reforming of the aqueous fraction of bio-oil over structured Ru/MgO/Al2O3 catalysts

Authors :
Xenophon E. Verykios
Aristides C. Basagiannis
Source :
Catalysis Today. 127:256-264
Publication Year :
2007
Publisher :
Elsevier BV, 2007.

Abstract

A catalyst consisting of Ru (5%) dispersed on 15% MgO/Al2O3 carrier exhibits high activity and selectivity, as well as satisfactory stability with time on stream, under conditions of steam reforming of acetic acid, a model compound for pyrolysis oil. The presence of MgO in the catalyst formulation is shown to be related to oxygen and/or hydroxyl radical spillover from the carrier to the metal particles. A series of Ru/MgO/Al2O3 catalysts supported on cordierite monoliths, ceramic foams and γ-Al2O3 pellets were prepared and tested for the production of hydrogen by catalytic steam reforming of the aqueous fraction of bio-oil. All different structural forms of the catalyst exhibited satisfactory activity, converting completely the bio-oil, good selectivity toward hydrogen and satisfactory stability with time on stream. However, the catalyst supported on pellets exhibited the best catalytic performance, among all catalysts investigated. Reforming reactions, and thus hydrogen production, are favoured at high temperatures and low space velocities. Coking is one of the most significant problems encountered in these processes. It was found that only a small part of the incoming carbon is deposited on the catalyst surface, which is mainly present as CHx. However, coke deposition is more intense on the reactor wall above the catalytic bed, due to homogeneous polymerization of unstable ingredients of bio-oil.

Details

ISSN :
09205861
Volume :
127
Database :
OpenAIRE
Journal :
Catalysis Today
Accession number :
edsair.doi...........6f127ef2f50fca351898944594228e2f
Full Text :
https://doi.org/10.1016/j.cattod.2007.03.025