Synthesis, characterization and hydrotreating performance of supported tungsten phosphide catalysts  

作　　者：Guida SUN Cuiqing LI Zhijun ZHOU Fengyan LI 

机构地区：[1]Green Chemistry and New Catalytic Material Laboratory,Beijing Institute of Petrochemical Technology,Beijing 102617,China

出　　处：《Frontiers of Chemical Science and Engineering》2008年第2期155-164,共10页化学科学与工程前沿（英文版）

基　　金：State Key Development Basic Research of China(Grant No.G2000048003);the National Natural Science Foundation of China(Grant No.200273011);China Petrochemical Corporation(X501022).

摘　　要：Supported tungsten phosphide catalysts were prepared by temperature-programmed reduction of their precursors(supported phospho-tungstate catalysts)in H2 and characterized by X-ray diffraction(XRD),BET,temperature-programmed desorption of ammonia(NH3-TPD)and X-ray photoelectron spectroscopy(XPS).The reduction-phosphiding processes of the precursors were investigated by thermogravimetry and differential thermal analysis(TG-DTA)and the suitable phosphiding temperatures were defined.The hydrodesulfurization(HDS)and hydrodenitrogenation(HDN)activities of the catalysts were tested by using thiophene,pyridine,dibenzothiophene,carbazole and diesel oil as the feedstock.The TiO2,c-Al_(2)O_(3) supports and the Ni,Co promoters could remarkably increase and stabilize active W species on the catalyst surface.A suitable amount of Ni(3%–5%),Co(5%–7%)and V(1%–3%)could increase dispersivity of the W species and the BET surface area of the WP/c-Al_(2)O_(3) catalyst.The WP/c-Al_(2)O_(3) catalyst possesses much higher thiophene HDS and carbazole HDN activities and the WP/TiO2 catalyst has much higher dibenzothiophene(DBT)HDS and pyridine HDN activities.The Ni,Co and V can obviously promote the HDS activity and inhibit the HDN activity of the WP/c-Al_(2)O_(3) catalyst.The G-Ni5 catalyst possesses a much higher diesel oil HDS activity than the sulphided industrial NiW/c-Al_(2)O_(3) catalyst.In general,a support or promoter in the WP/c-Al_(2)O_(3) catalyst which can increase the amount and dispersivity of the active W species can promote its HDS and HDN activities.

关 键 词：supported tungsten phosphide catalyst hydrodesulfurization(HDS) hydrodenitrogenation(HDN) DIBENZOTHIOPHENE carbazole 

分 类 号：O64[理学—物理化学]