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Iridium sulfide and Ir promoted Mo based catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
43924 45995 2007 10 PDF Available
Title
Iridium sulfide and Ir promoted Mo based catalysts
Abstract

Literature data covering the preparation and catalytic properties of Ir sulfide catalysts during the last two decades in relation to hydrotreating reactions, mainly hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) of model compounds, have been reviewed. It has been shown that Ir sulfide belongs to the most active members of the third row noble metal sulfides. The specific activity of a well dispersed Ir sulfide in reactions of model compounds (type of thiophene, indole, pyridine, quinoline) is substantially greater than that of conventional CoMo (NiMo) catalysts. Sulfided Ir in an amount of about 0.5 wt.% is an efficient promoter of the Mo/Al2O3 catalysts, yielding synergetic effects in HDS and HDN of about 3. However, this synergy diminishes at the higher Ir loadings because of the drop in Ir dispersion. Modification of the NiMo/Al2O3 catalysts by Ir usually led to the decrease of HDS activity and the increase of HDN activity.

Keywords
Iridium sulfide; IrMo catalyst; Hydrodesulfurization; Hydrodenitrogenation; Hydrotreatment
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 322, 16 April 2007, Pages 142–151
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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