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Indexed by:期刊论文

Date of Publication:2013-08-01

Journal:CATALYSIS TODAY

Included Journals:SCIE、EI

Volume:211

Page Number:126-130

ISSN No.:0920-5861

Key Words:MCM-41; Ni2P; Hydrogen plasma reduction; Temperature-programmed reduction; XAS; Hydrodesulfurization

Abstract:Two Ni2P hydrodesulfurization (HDS) catalysts supported over siliceous MCM-41 were prepared by the conventional temperature-programmed reduction method (Ni2P-TPR) and a novel hydrogen plasma reduction method (Ni2P-PR). They were characterized by XRD and XAS. Their catalytic performances were evaluated by HDS of dibenzothiophene. The results indicated that a well dispersed Ni2P phase with crystal structure close to the standard was obtained by the hydrogen plasma reduction. For the catalyst prepared by the temperature-programmed reduction method, extra phosphorus was found in the lattice of Ni2P phase, leading to the lattice distortion, the increase in the Ni-P coordination number, and the decrease in the Ni-Ni coordination number with lengthening of its bond distance. Ni in Ni2P-TPR was more electron deficient than that in Ni2P-PR, probably due to the electronic interaction between Ni and the extra P present in Ni2P-TPR. Consequently, Ni2P-TPR showed higher hydrogenation selectivity than Ni2P-PR. (C) 2013 Elsevier B.V. All rights reserved.