Journal
JOURNAL OF CATALYSIS
Volume 296, Issue -, Pages 24-30Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2012.08.019
Keywords
Strontium; Phosphate; Hydroxyapatite; Ethanol; 1-Butanol; Basic site density
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Funding
- Sangi Co. Ltd.
- Cooperative Research Program of the Catalysis Research Center, Hokkaido University [2010-B-2002]
- Grants-in-Aid for Scientific Research [23760735] Funding Source: KAKEN
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Strontium phosphate hydroxyapatites (Sr-HAP) with various Sr/P molar ratios were synthesized under hydrothermal conditions. X-ray photoelectron spectroscopy revealed a close correlation between the near-surface and bulk Sr/P molar ratios of catalyst samples. Sr-HAP catalysts show high 1-butanol selectivity in the gas-phase conversion of ethanol. Sr-HAP catalysts with higher Sr/P molar ratios showed higher catalytic activity and 1-butanol selectivity. The density of both relatively strong basic sites and acidic sites was seen to increase with increasing Sr/P molar ratios, though the basic site density was significantly higher than the acidic site density. The rate-determining step in ethanol conversion over Sr-HAP catalysts was considered to be the dimerization process, as aldol condensation is mainly accelerated by base catalysis, which would explain why the Sr-HAP catalysts with higher basic site density showed higher catalytic activity and 1-butanol selectivity. (C) 2012 Elsevier Inc. All rights reserved.
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