Title of article :
1-Butanol synthesis from ethanol over strontium phosphate hydroxyapatite catalysts with various Sr/P ratios
Author/Authors :
Shuhei Ogo، نويسنده , , Ayumu Onda ، نويسنده , , Yukina Iwasa، نويسنده , , Kenji Hara، نويسنده , , Atsushi Fukuoka، نويسنده , , Kazumichi Yanagisawa، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2012
Abstract :
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.
Keywords :
Al2O3 binder , Phenol hydrodeoxygenation , React IR , Dealumination
Journal title :
Journal of Catalysis
Journal title :
Journal of Catalysis