1-Butanol synthesis from ethanol over strontium phosphate hydroxyapatite catalysts with various Sr/P ratios

Shuhei Ogo, Ayumu Onda, Yukina Iwasa, Kenji Hara, Atsushi Fukuoka, Kazumichi Yanagisawa

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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.

Original languageEnglish
Pages (from-to)24-30
Number of pages7
JournalJournal of Catalysis
Publication statusPublished - 2012 Dec
Externally publishedYes



  • 1-Butanol
  • Basic site density
  • Ethanol
  • Hydroxyapatite
  • Phosphate
  • Strontium

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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