Isopropylation of naphthalene is a promising way to prepare 2,6-diisopropylnaphthalene(2,6-DIPN).Among all the catalysts the mordenite is of best selectivity for it,but coke deposition occurs at acid sites to deactivate the catalysis.In this study,2,6-DIPN was prepared by the shape-selective isopropylation of naphthalene with propylene in autoclave using steam dealuminated H-mordenite(SDHM) as the catalyst.The regularities of coking deactivation of mordenite on isopropylation of naphthalene were investigate...