STUDY ON THE ACTIVE-CENTER OF GA2O3/HZSM-5 CATALYST

The study of a physically mixed Ga2O3/HZSM-5 catalyst shows that propene aromatization on the catalyst may be improved by activating it in hydrogen at high temperature. The optimal pretreatment conditions are at 773 K in hydrogen for 2 h and about 1 wt.-% Ga content. Ga(III) in Ga2O3/HZSM-5 catalyst cannot be reduced by the high temperature pretreatment in hydrogen. The enhancement of propene aromatization on the catalyst may be due to the migration of gallium species, possibly into the channels of the zeolite, and the improvement of hydrogen transfer properties of the catalyst. The hydrogen adsorption-desorption process is completely reversible.