• the crucial role of reaction pressure in the reaction paths for i-butane conversion over zn/hzsm-5

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 551
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     catalytic conversion of i-butane over zn-modified hzsm-5 catalyst was systematically investigated at different reaction pressures. a special fixed-bed reactor involving a vacuum unit which could modulate reaction pressure from subatmospheric to positive pressure was used. results show that reaction pressure can change the initial activation and subsequent reaction paths of i-butane over zn/hzsm-5 catalyst. at subatmospheric pressure, the decrease in reaction pressure favors the dehydrogenation of i-butane, meanwhile inhibits both the cracking of i-butane and the secondary reactions such as the oligomerization, cracking and aromatization. consequently, the selectivities to the undesired by-products (methane and ethane) are notably abated, and the selectivities to the desired products (ethylene, propylene and aromatics) significantly increase. although space velocity affects the reaction paths for i-butane conversion, the change in reaction pressure has a more profound effect on the reaction paths.

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