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Abstract: A series of boron isomorphously framework-substituted ZSM-5 (B x –Al–ZSM-5, Si/Al=200, B/Al=X) were synthesized and used to selectively transform methanol to propylene (MTP). The catalytic stability can be significantly influenced by B incorporation. In comparison with the conventional ZSM-5, the B1–Al–ZSM-5 catalyst afforded a 7-time-long catalytic life under a space velocity of WHSV 1.8h−1 (700h for B1–Al–ZSM-5 and 100h for ZSM-5, respectively). The enhancement of catalytic stability can be attributed to the increase of weak acid sites on the ZSM-5 catalysts. [Copyright &y& Elsevier]

Abstract: Modified high silica HZSM-5 catalysts have been used to selectively transform methanol to propylene (MTP). The HZSM-5 catalyst with a Si/Al ratio of 220 exhibited satisfying catalytic performance (space time yield of propylene is up to 18mmol/gh). The selectivity of propylene can be obviously affected by additives. P leads to a pronounced improvement of propylene selectivity up to 55.6% with complete conversion of methanol. The enhancement of propylene selectivity and catalytic life can be attributed to partial elimination of the strong acid sites on the HZSM-5 catalyst. [Copyright &y& Elsevier]