Influence of alkali metal modification and reaction conditions on the catalytic activity and stability of Ni containing smectite-type material for steam reforming of acetic acid

A Ni incorporated mesoporous smectite-like material, SM(Ni), was modified by various alkali metals, such as, Li, Na, K, Rb or Cs, and tested for the steam reforming of acetic acid as a model compound of aqueous phase of bio-oil derived from biomass pyrolysis. Initial conversion of acetic acid and co...

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Bibliographic Details
Published in:International journal of hydrogen energy 2011-05, Vol.36 (10), p.5904-5911
Main Authors: Iwasa, Nobuhiro, Yamane, Toshiyuki, Arai, Masahiko
Format: Article
Language:English
Subjects:
Acetic acid
Alkali metal
Alkali metals
Alternative fuels. Production and utilization
Applied sciences
Carbon
Catalysts
Deposition
Energy
Exact sciences and technology
Fuels
Hydrogen
Nickel
Reforming
Smectite
Smectites
Steam reforming
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Summary:A Ni incorporated mesoporous smectite-like material, SM(Ni), was modified by various alkali metals, such as, Li, Na, K, Rb or Cs, and tested for the steam reforming of acetic acid as a model compound of aqueous phase of bio-oil derived from biomass pyrolysis. Initial conversion of acetic acid and concentration of H 2 produced are drastically enhanced by the modification with these alkali metals. 1.0 wt% K-modified SM(Ni) catalyst exhibits the highest activity among the modified SM(Ni) materials tested. Addition of K promotes the reduction of Ni species incorporated in the smectite, yielding more metallic Ni species than in the original SM(Ni) sample. Therefore, the K-modified SM(Ni) catalyst gives higher initial activity compared with the original smectite catalyst. However, these modified materials lose their activities due to carbon deposition on their surface during the course of reaction, similar to the original SM(Ni). The influence of reaction conditions, such as O 2 or H 2 addition, steam to carbon ratio (S/C) and reaction temperature, was also investigated. Higher and more stable activity was obtained with unmodified SM(Ni) catalyst at a high reaction temperature of 973 K and at an S/C ratio of 3.3.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2011.01.155