Study of hydrodesulfurization of 4,6-DM-DBT over Pd supported on mesoporous USY zeolite

Study of hydrodesulfurization of 4,6-DM-DBT over Pd supported on mesoporous USY zeolite
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介孔USY沸石负载Pd对4,6-DM-DBT加氢脱硫研究

DOI:
10.1016/j.apcata.2012.05.028
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发表时间:
2012-08
期刊:
Applied Catalysis A: General
影响因子:
--
通讯作者:
Tang, Tian-di
Tang, Tian-di
中科院分区:
其他
文献类型:
--
作者:
Zhang, Lei;Fu, Wenqian;Ke, Qingping;Zhang, Shuai;Jin, Huile;Hu, Jianbo;Wang, Shun;Tang, Tian-di

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采用水蒸气脱铝法,在550和600°C下制备了介孔体积分别为0.15和0.25cm ~ 3/g的超稳Y型分子筛(USY 550和USY 600)。以γ-Al 2 O3、H型Y(HY)和介孔USY为载体,负载Pd催化剂用于4,6-二甲基二苯并噻吩(4,6-DM-DBT)加氢脱硫反应。Pd/USY 550和Pd/USY 600上的4,6-DM-DBT转化率(85.7%和76.9%)高于Pd/HY(43.7%),这是由于4,6-DM-DBT在介孔USY中促进了传质。氨的分步程序升温脱附结果表明,Pd/USY比Pd/γ-Al 2 O3具有更好的HDS性能,这是由于USY具有更强的酸性。热重和X-射线光电子能谱分析表明,催化剂失活的原因是硫对载体上Pd颗粒的毒害。
Two ultra-stable Y zeolites (USY550 and USY600) with mesoporous volumes of 0.15 and 0.25cm3/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-Al2O3is 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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