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Indexed by:期刊论文

Date of Publication:2009-09-10

Journal:JOURNAL OF CATALYSIS

Included Journals:SCIE、EI、Scopus

Volume:266

Issue:2

Page Number:369-379

ISSN No.:0021-9517

Key Words:Molybdenum phosphide; Preparation; Sulfidation; Hydrodesulfurization; Dibenzothiophene; 4,6-Dimethyldibenzothiophene

Abstract:MoP/MCM-41 was prepared from its oxidic precursors by sulfidation at 400 degrees C for 3 h using 10% H(2)S/H(2), followed by temperature-programed reduction in H(2). The resulting catalyst, MoP/MCM-41(SR), showed considerably a higher catalytic activity in the hydrodesulfurization (HDS) of clibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT) than a catalyst prepared by temperature-programed reduction (MoP/MCM-41 (R)). 4,6-DMDBT exhibited much higher activity than DBT both in independent and in simultaneous HDS. Comparison of the HDS performance of MoP/MCM-41(SR) with mixtures of MoP/MCM-41(R) and MOS(2)/MCM-41 excluded the synergetic effect of separate MOS(2) and MoP phases in MoP/MCM-41(SR). XRD characterization indicated that smaller molybdenum phosphide crystals were generated in MoP/MCM-41(SR). A shift of the Mo 3d(5/2) binding energy from 228.6 to 229.1 eV was observed in the XPS spectra, which might be related with the incorporation of sulfur in the MoP structure. Moreover, the sulfidation step facilitated the formation of MoP crystals and lowered the threshold reduction temperature. (C) 2009 Elsevier Inc. All rights reserved.