Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 148, Issue -, Pages 269-280Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2013.11.012
Keywords
Hydrogen production; Steam reforming of LNG; Mesoporous phosphorus-modified alumina; Nickel catalyst; Epoxide-driven sol-gel method
Funding
- Global Frontier R&D Program on Center for Multiscale Energy System
- National Research Foundation under the Ministry of Science, ICT & Future Planning, Korea [2012M3A6A7054866]
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A series of nickel catalysts supported on mesoporous phosphorus-modified alumina xerogel (Ni/XPA, X=P/Al molar ratio) were prepared by an epoxide-driven sol gel method and a subsequent incipient impregnation method, and they were applied to the hydrogen production by steam reforming of simulated liquefied natural gas (LNG). All the calcined phosphorus-modified alumina xerogel supports (XPA, X=P/Al molar ratio) retained a mesoporous structure with amorphous crystalline phase. The amount of penta-coordinated aluminum species increased with increasing X (P/Al molar ratio) of XPA supports. Although the calcined Ni/XPA catalysts retained both nickel oxide phase and nickel aluminate phase, relative distribution of nickel species of the catalysts was different depending on X (P/Al molar ratio). Among the catalysts, Ni/0.05PA catalyst showed the highest binding energy of nickel species. Crystallite size of metallic nickel increased with increasing X (P/Al molar ratio) in the reduced Ni/XPA catalysts. However, Ni/0.05PA catalyst showed the largest amount of strong hydrogen-binding sites and exhibited the largest amount of adsorbed methane in the H2-TPD and CH4-TPD measurements, respectively. Catalytic performance in the steam reforming of LNG over Ni/XPA catalysts showed a volcano-shaped trend with respect to X (P/Al molar ratio). This result was well correlated with the amount of adsorbed methane calculated from CH4-TPD measurements. Among the catalysts tested, Ni/0.05PA catalyst with the highest affinity toward methane showed the best catalytic performance in hydrogen production by steam reforming of LNG. (C) 2013 Elsevier B.V. All rights reserved.
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