Abstract
The conversion (dehydration/dehydrogenation) of alcohols in α-methylated series (methanol, ethanol, 2-propanol, and tert-butanol) on AlPO 4 catalysts differently prepared has been studied by microcatalytic pulse reactor technique at different temperatures and flow rates. The kinetic parameters have been obtained by analysis of the data through the Bassett-Habgood equation. Dehydration to ether and/or olefin is the major reaction process. Dehydrogenation product was only scarcely found in 2-propanol conversion. The influence of the reaction temperature upon the conversion of alcohols and the selectivities of the products was investigated. Activity increases as a function of surface acidity of the AlPO 4 catalyst as well as with the α-substitution in the alcohol. Moreover, selectivity studies indicated that ethanol and 2-propanol dehydration follows a combination pathway of parallel and consecutive reactions. A good correlation between the results of dehydration conversion and acid properties, gas-chromategraphically measured through the irreversible adsorption of pyridine (473 and 573 K) and 2,6-dimethylpyridine (573 K), is observed. Also, activity poisoning results indicated that Brønsted acid sites of AlPO 4 catalyst participated in dehydration processes, thus strengthening the carbenium ion reaction pathway in AlPO 4 catalysts.
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