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.
| Original language | English |
|---|---|
| Pages (from-to) | 24-30 |
| Number of pages | 7 |
| Journal | Journal of Catalysis |
| Volume | 296 |
| DOIs | |
| Publication status | Published - 2012 Dec |
| Externally published | Yes |
Keywords
- 1-Butanol
- Basic site density
- Ethanol
- Hydroxyapatite
- Phosphate
- Strontium
ASJC Scopus subject areas
- Catalysis
- Physical and Theoretical Chemistry