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کاتالیزور کاربردی a: عمومی 2012
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  • micro-mesoporous composite molecular sieves h-zsm-5/mcm-41 for methanol dehydration to dimethyl ether: effect of sio2/al2o3 ratio in h-zsm-5

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     micro-mesoporous composite molecular sieves h-zsm-5/mcm-41 were prepared by the hydrothermal technique with alkali-treated h-zsm-5 zeolite as source and characterized by scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy, x-ray diffraction, n2 adsorption and desorption measurement, and nh3 temperature-programmed desorption. the effect of sio2/al2o3 ratio in h-zsm-5 on the structure, surface acidity and catalytic performances of h-zsm-5/mcm-41 for methanol dehydration to dimethyl ether were investigated. h-zsm-5/mcm-41 prepared with h-zsm-5 of different sio2/al2o3 ratios as source in which h-zsm-5 nanoparticles were uniformly dispersed in mcm-41 matrix, had well-ordered micropores and mesopores. the acid amount and strength of moderate acid sites (tp1) of h-zsm-5/mcm-41 can be controlled by the sio2/al2o3 ratio in h-zsm-5 during the range from 25 to 50. among these catalysts, h-zsm-5/mcm-41 presented a comparable catalytic activity to the corresponding pure h-zsm-5 and 100% dimethyl ether selectivity in a wider temperature range than the corresponding pure h-zsm-5. the excellent catalytic performances were due to the highly active and uniform strong acid sites and the hierarchical porosity in the micro-mesoporous composite molecular sieves. the catalytic mechanism of h-zsm-5/mcm-41 for the methanol dehydration to dimethyl ether was also discussed.

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