Formation of multi-branched-chain aliphatics in methanol conversion over modified mordenites Original Research Article

The influences of zeolite pore structure, dealumination and Na ion exchange on the product distribution were examined in order to explore the possibility of selective formation of multi-branched-chain aliphatics, such as iso-octane, in methanol conversion. On H-form mordenite, the selectivity of multi-branched-chain aliphatics was higher than those on other type zeolites such as ZSM-5 and Y zeolites. Modification of mordenite by using both Na ion exchange and dealumination promoted the formation of multi-branched-chain aliphatics. The effect of the modifications in the formation of multi-branched-chain aliphatics is discussed in reference to methylation of 1-hexene with methanol.