Abstract:Mordenite with densely packed columnar crystal morphology was prepared by dynamic hydrothermal synthesis method using hexamethyleneimine as template. Cr2O3, MgO and ZnO modified mordenites were prepared by equal volume impregnation method, and catalytic performance on 1-methylnaphthalene isomerization-transalkylation coupling reaction was investigated. Structure and acid properties of samples were characterized by XRD, N2 adsorption-desorption, SEM and NH3-TPD. The results indicate that, compared with mordenite with particle morphology, mordenite columnar crystals have larger specific surface area, total pore volume and mesoporous pore volume. NH3-TPD profile indicates their acid strength is similar but acid density is reduced. In isomerization-transalkylation coupling reaction of 1-methylnaphthalene with mesitylene, both conversion of 1-methylnaphthalene, mesitylene and yield of dimethylnaphthalene are obviously improved with mordenite columnar crystals as catalyst. For metal oxide modified mordenite columnar crystals, specific surface area and amount of medium strong acid decrease. Selectivity to 2-MN increases, however selectivity to macromolecular by-products such as trimethylnaphthalene decreases. Selectivity of catalysts can be adjusted by metal oxide modification.