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Indexed by:期刊论文

Date of Publication:2010-07-01

Journal:ENERGY & FUELS

Included Journals:SCIE、EI、Scopus

Volume:24

Issue:7

Page Number:3796-3803

ISSN No.:0887-0624

Abstract:Silica supported nickel phosphide catalysts with initial Ni/P molar ratios from 0.5 to 2.0 and the sum of NiO and P(2)O(5) loadings from 10 to 40 wt % in their precursors have been prepared by the temperature-programmed reduction method and characterized by means of X-ray diffraction, N(2) physisorption, CO chemisorption, and pyridine adsorption with in situ Fourier transform-infrared (FT-IR) spectroscopy. Naphthalene hydrogenation was carried out at 340 degrees C and 4.0 MPa over the as-prepared Ni(2)P/SiO(2) catalysts. Mutual influences of naphthalene hydrogenation and guillotine hydrodenitrogenation were investigated under similar conditions. The catalyst with Ni/P = 1.25 and 30 wt % loading showed the complete naphthalene conversion as well as 92.1% of selectivity to decalin. It was observed that cis-decalin converted partly into trans-decalin under the studied conditions. Addition of quinoline into naphthalene hydrogenation obviously decreased naphthalene conversion and selectivity to decalin over the Ni(2)P/SiO(2) catalysts due to the strong adsorption of guillotine on active sites. The similar effects of the guillotine hydrogenated compounds on naphthalene hydrogenation were also observed over the Ni(2)P/SiO(2) catalysts. The addition of naphthalene had no effect on guillotine hydrogenation to tetrahydroquinoline but inhibited tetrahydroquinoline hydrogenation to decahydroguinoline. Naphthalene conversion over the Ni(2)P/SiO(2) catalyst in the presence of quinoline and dibenzothiophene decreased with the increase of their contents. It is noteworthy that naphthalene conversion could be recovered after the removal of guillotine while the hydrogenation activity could not in the case of dibenzothiophene.