Synthesis, characterization and hydrotreating performance of supported tungsten phosphide catalysts |
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Authors: | Guida Sun Cuiqing Li Zhijun Zhou and Fengyan Li |
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Affiliation: | (1) Green Chemistry and New Catalytic Material Laboratory, Beijing Institute of Petrochemical Technology, Beijing, 102617, China |
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Abstract: | 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, γ-Al2O3 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/γ-Al2O3 catalyst. The WP/γ-Al2O3 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/γ-Al2O3 catalyst. The G-Ni5 catalyst possesses a much higher diesel oil HDS activity than the sulphided industrial NiW/γ-Al2O3 catalyst. In general, a support or promoter in the WP/γ-Al2O3 catalyst which can increase the amount and dispersivity of the active W species can promote its HDS and HDN activities. |
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Keywords: | supported tungsten phosphide catalyst hydrodesulfurization (HDS) hydrodenitrogenation (HDN) dibenzothiophene carbazole |
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