Lanthanum Oxides-Improved Catalytic Performance of ZSM-5 in Toluene Alkylation with Methanol

Lanthanum oxides were real time modified to ZSM-5 during the hydrothermal synthesis of the zeolite. The addition of lanthanum oxides does not change the basic structure of ZSM-5, but obviously decrease the crystallinity and BrOnsted acid amount. The catalysis tests show that modification of ZSM-5 with lanthanum oxides significantly suppresses the coke formation on the catalyst surface and improves the catalyst stability, which is likely associated with the decrease of BrOnsted acid amounts and a promotional function of lanthanum oxides for the reaction between coke and water.