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论文类型：期刊论文

发表时间：2009-09-10

发表刊物：JOURNAL OF CATALYSIS

收录刊物：SCIE、EI、Scopus

卷号：266

期号：2

页面范围：369-379

ISSN号：0021-9517

关键字：Molybdenum phosphide; Preparation; Sulfidation; Hydrodesulfurization; Dibenzothiophene; 4,6-Dimethyldibenzothiophene

摘要：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.