Steam-assisted catalytic cracking of n-hexane over La-Modified MTT zeolite for selective propylene production

Steam-assisted catalytic cracking is an interesting process to produce petrochemicals. Herein, we report the incorporation of lanthanum (La) into MIT zeolite to improve its stability in the presence of steam. A series of La modified MIT zeolite was prepared in a microwave-assisted ion-exchange. The activity of parent and modified MU zeolites have been investigated in the steam catalytic cracking of n-hexane. Both parent and La modified zeolites showed excellent selectivity to olefins in the steam-assisted catalytic cracking of n-hexane. The incorporation of La into the cation exchange sites of MIT zeolite enhanced its selectivity to light olefins, especially propylene. La-modified MIT zeolites exhibited better resistance to steam. The modification of MIT with a rare earth metal is a promising approach to improve the stability of aluminosilicate in steam-assisted reactions. (C) 2015 Elsevier B.V. All rights reserved.