Tuning product selectivity in the MTO reaction over Zn-modified SSZ-13 catalysts
Abstract
In this work, Zn-modified SSZ-13 catalysts with different spatial distributions of zinc species were prepared by ion exchange (IE), wet impregnation (WI) and in situ synthesis (IS) methods employed for the methanol-to-olefin (MTO) reaction. The reaction results indicate that the initial selectivity towards light olefins significantly enhances from 33% over H-SSZ-13 to 43–70% over Zn-modified catalysts. As for Zn-modified Zn-SSZ-13-IE catalysts, the effect of the zinc content was also investigated and the optimum catalytic performance is obtained over the Zn(1.31)-SSZ-13-IE catalyst with initial and maximum olefin selectivities of 82% and 88% and initial and maximum selectivity ratios of ethylene-to-propylene of 2.21 and 2.14.
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