TiO2柱撑海泡石负载Ni2P的噻吩加氢脱硫性能

doi:10.3866/PKU.WHXB201209281

Abstract

Abstract:

Samples containing a nickel phosphide precursor were synthesized by the impregnation method using TiO₂-pillared sepiolite (Ti-Sep) as a support, nickel hydroxide as a nickel source, and phosphorous acid as a phosphorus source. From these precursor samples, Ni₂P/Ti-Sep catalysts with Ni content ranging from 5%-25% (w, mass fraction) were prepared by temperature-programmed reduction. Thiophene hydrodesulfurization (HDS) was used to investigate the HDS activity of the catalysts. The catalysts were characterized by X-ray powder diffraction (XRD), N₂ adsorption-desorption, thermal gravity analysis (TGA), transmission electron microscope (TEM), and Fourier transform infrared spectroscopy (FTIR). The results demonstrated that the specific surface area and pore volume of Ti-Sep were enlarged and catalyst thermal stability was improved. In addition, the layer spacing of sepiolite was also increased. As a consequence, the active component, Ni₂P, can be well dispersed on the interlayer and outer surface of Ti-Sep. Moreover, the layered sepiolite structure remained intact in the Ni₂P/Ti-Sep catalysts. Consequently, thiophene conversion on Ni₂P/Ti-Sep is improved compared with Ni₂P/Na-Sep (NaCl-modified sepiolite) and Ni₂P/HCl-Sep (HCl-modified sepiolite), which were prepared on sepiolite without Ti-pillaring. Ni₂P/Ti-Sep with a Ni loading of 15% (w) shows the highest activity among all of the studied catalysts, on which the conversion of thiophene can reach 100% at 400℃.

Key words: Ni₂P, TiO₂, Pillared sepiolite, Thiophene, Hydrodesulfurization

MSC2000:

O643

LIAO Hui, XU Xiang-Lan, CHEN Wei-Qing, SHI Qiu-Jie, LIU Wen-Ming, WANG Xiang. Ni₂P Catalysts Supported on TiO₂-Pillared Sepiolite for Thiophene Hydrodesulfurization[J].Acta Phys. -Chim. Sin., 2012, 28(12): 2924-2930.

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Ni₂P Catalysts Supported on TiO₂-Pillared Sepiolite for Thiophene Hydrodesulfurization

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Ni2P Catalysts Supported on TiO2-Pillared Sepiolite for Thiophene Hydrodesulfurization

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Ni₂P Catalysts Supported on TiO₂-Pillared Sepiolite for Thiophene Hydrodesulfurization