CATALYTIC CONVERSION OF ALCOHOLS .13. ALKENE SELECTIVITY WITH TIO2 CATALYSTS

Anatase is a very selective dehydration catalyst and the alkenes formed from 2-ols resemble those formed with an alumina catalyst. Rutile is not a selective dehydration catalyst; the alkene selectivity depends on pretreatment and it is more selective for 1-alkene formation from 2-ols than anatase. With anatase the more rapid conversion of cis-2-methylcyclohexanol isomer and the different alkene composition from the two alcohol isomers are consistent with a contribution of an anti elimination mechanism. For the conversion of alcohols with group 4A metal oxide catalysts, anatase and hafnia resemble each other but differ markedly from zirconia and thoria. © 1979, American Chemical Society. All rights reserved.