• study of hydrodesulfurization of 4,6-dm-dbt over pd supported on mesoporous usy zeolite

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     two ultra-stable y zeolites (usy550 and usy600) with mesoporous volumes of 0.15 and 0.25 cm3/g were prepared by steam dealumination at 550 and 600 °c, respectively. pd catalysts were supported on γ-al2o3, h-forms of zeolite y (hy), mesoporous usy for hydrodesulfurization (hds) of 4,6-dimethyldibenzothiophene (4,6-dm-dbt). the 4,6-dm-dbt conversions over pd/usy550 (85.7%) and pd/usy600 (76.9%) are higher than over pd/hy (43.7%) due to the facilitated mass transfer of 4,6-dm-dbt in the mesopores usy. the better hds performance of pd/usy than pd/γ-al2o3 is attributed to the stronger acidity of usy, as demonstrated by the stepwise temperature-programmed desorption of ammonia. thermogravimetric and x-ray photoelectron spectroscopic analysis of the used catalysts showed that the poison of pd particles over the supports by sulfur was responsible for the catalyst deactivation.

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