US EPA

1134683 

Journal Article 

Reaction of ethanol over hydroxyapatite affected by Ca/P ratio of catalyst 

Tsuchida, T; Kubo, J; Yoshioka, T; Sakuma, S; Takeguchi, T; Ueda, W 

2008 

Yes 

Journal of Catalysis
ISSN: 0021-9517
EISSN: 1090-2694 

259 

2 

183-189 

10.1016/j.jcat.2008.08.005 

WOS:000260978000004 

http://linkinghub.elsevier.com/retrieve/pii/S0021951708003102
Exit
 

The mineral hydroxyapatite [HAP; Ca10(PO4)6(OH)2] is the chief component of animal bones and teeth. It also is known to function as a catalyst with both acid and base sites, depending on the manner in which it is synthesized. We closely studied the reaction of ethanol over HAP using catalysts of different Ca/P molar ratios. These were prepared by controlling the pH of the solution during precipitation synthesis. We found that the distribution of acid sites and basic sites on the catalyst surface varied with the Ca/P ratio of HAP. The yields of ethylene, 1-butanol, and 1,3-butadiene were correlated with the ratio of acid sites and basic sites. We further found that yields of higher alcohols, such as 1-butanol, that are known as Guerbet alcohols and are characteristic products of ethanol over HAP, are functions of the probability of ethanol activation (α) on the catalyst surface. 

Hydroxyapatite; Acid basic catalyst; Ca/P ratio; Ethanol; 1-Butanol; Guerbet alcohol; Guerbet reaction; Probability; Ethanol activation