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Hydrodesulfurization of 4,6-dimethyldibenzothiophene over high surface area metal phosphides

Paper ID Volume ID Publish Year Pages File Format Full-Text
42449 45926 2009 8 PDF Available
Title
Hydrodesulfurization of 4,6-dimethyldibenzothiophene over high surface area metal phosphides
Abstract

Unsupported monometallic phosphides (MoP and Ni2P), as well as a series of bimetallic nickel molybdenum phosphides (NixMoP), were synthesized with high surface area by adding citric acid (CA) to precursor metal salt solutions prior to drying, calcination and temperature-programmed reduction (TPR). The resulting MoP and Ni2P catalysts had surface areas of 139 and 216 m2/g, respectively. The surface areas of the NixMoP catalysts decreased with increased Ni content and ranged from 121 to 16 m2/g. In all cases, the catalyst surface area was greater than that obtained when a conventional preparation procedure was followed that did not use CA. The activity of the catalysts for the hydrodesulfurization (HDS) of a feed containing 3000 ppm 4,6-dimethyldibenzothiophene (4,6-DMDBT) in toluene was measured at 583 K and 3.0 MPa. The resulting catalysts were highly active and among the studied phosphides, Ni2P exhibited the highest HDS activity with a conversion of 87.7% at a WHSV of 26 h−1 and a H2/liquid feed ratio of 625 (v/v). The HDS TOF decreased in the order Ni2P > NixMoP > MoP and for the NixMoP catalyst, the observed TOF increased with Ni content.

Graphical abstractHigh surface area MoP (139 m2/g), Ni2P (216 m2/g) and a series of NixMoP (121–16 m2/g) catalysts were synthesized by adding citric acid (CA) to precursor salt solutions prior to drying, calcination and reduction. Their HDS TOFs decreased in the order Ni2P > NixMoP > MoP and for the NixMoP catalysts, the observed TOF increased with Ni content.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Catalyst; Hydrodesulfurization; Metal phosphide; Nickel phosphide; Molybdenum phosphide; 4,6-Dimethyldibenzothiophene; Citric acid
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 361, Issues 1–2, 20 June 2009, Pages 18–25
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us