• catalytic dehydration of methanol to dimethyl ether over micro–mesoporous zsm-5/mcm-41 composite molecular sieves

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     a series of micro–mesoporous zsm-5/mcm-41 composite molecular sieves were prepared by combining a microporous zeolite silica source with nano self-assembly methods, and characterized by sem, tem, xrd, n2 adsorption and desorption, tpd of ammonia, and their catalytic performance for the dehydration of methanol to dimethyl ether (dme) in a fixed bed microreactor at atmospheric pressure. among these catalysts, the zsm-5/mcm-41 sample alkali-treated with 1.5 mol/l naoh solution, in which the relative crystallinity of zsm-5 and mcm-41 are 54.5% and 30.5%, respectively, gave the best activity (xmeoh > 80%) with 100% selectivity and a long lifetime in a wide range of temperature from 190 °c to 300 °c. from the characterization and activity data, the formation mechanism of the micro–mesoporous composite molecular sieves was proposed to be a liquid-crystal templating mechanism.

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