Effect of H-ZSM-5/Al2O3 Catalyst Acidity on the Conversion of Methanol

The conversion of methanol on H-ZSM-5/Al2O3 catalyst with a 1/1 zeolite/alumina ratio by mass was studied. The presence of acid sites of different strength on the H-ZSM-5/Al2O3 catalyst was established by the NH3-TPD method. It was found that increasing the reaction temperature leads to increase of the degree of conversion of the methanol and the yield of the olefin, while the yield of dimethyl ether passes through a maximum. The obtained results are explained in terms of a proposed kinetic scheme of the process, according to which the dimethyl ether and hydrocarbons are formed on different types of acid sites.