Hits:

Indexed by:期刊论文

Date of Publication:2009-01-25

Journal:JOURNAL OF CATALYSIS

Included Journals:SCIE、EI

Volume:261

Issue:2

Page Number:232-240

ISSN No.:0021-9517

Key Words:Hydrodesulfurization; Sulfur; H(2)S passivation; Hydrodenitrogenation; Hydrodeoxygenation; Nickel phosphide; MCM-41

Abstract:The effect of using a mixture of 10 mol% H(2)S and H(2) to passivate a Ni(2)P/MCM-41 catalyst was studied. It was found that H(2)S passivation was superior to conventional O(2) passivation because it gave a higher HDS activity and required no post re-reduction. Chemisorption of CO indicated that the passivation layer covered or replaced the surface active sites. Characterization of X-ray photoelectron spectroscopy revealed that the sulfur species on the surface of the H(2)S-passivated Ni(2)P/MCM-41 were polysulfide ligands rather than S(2-) or S(2-) and the sulfur species were partially oxidized. A treatment with NH(3) was also used, and it was found that N species were strongly bonded to the surface sites of Ni(2)P. Hydrodesulfurization and hydrodenitrogenation/hydrodeoxygenation were carried out in an alternating sequential manner to study the effect of surface sulfur on the catalytic activity of Ni(2)P/MCM-41. Sulfur analysis of the spent catalysts revealed that the HDS activity correlated with the sulfur content retained on Ni(2)P/MCM-41. indicating that sulfur is part of the active sites of the HDS reaction. (C) 2008 Elsevier Inc. All rights reserved.