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The effect of phosphorus on hydrotreating property of NiMo/γ-Al2O3 nitride catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
43681 45982 2008 7 PDF Available
Title
The effect of phosphorus on hydrotreating property of NiMo/γ-Al2O3 nitride catalyst
Abstract

γ-Al2O3 supported P-doped nickel molybdenum (NiMo) nitride hydrotreating catalysts with 12 wt.% of Mo, 3 wt.% Ni and 0–2.5 wt.% P were synthesized by means of temperature-programmed reaction, and characterized by BET surface area analysis, elemental analysis, CO uptake titration, DRIFT study of adsorbed CO, temperature-programmed oxidation (TPO), temperature-programmed reduction (TPR) and temperature-programmed desorption (TPD) of NH3. The activity of the nitride catalysts was studied in a trickle-bed reactor operated at 8.8 MPa and 385 °C in the hydrodenitrogenation (HDN) and hydrodesulfurization (HDS) of heavy gas oil (HGO) derived from Athabasca bitumen. The CO uptakes measurement showed that P addition to NiMo nitride improves the dispersion. DRIFT spectra of CO adsorption evidenced that the number of Mo2+ sites on the surface of NiMo nitride increases with increasing P concentration and reaches optimum with 2.0 wt.% of P. TPD of NH3 indicated an increase of strong acid sites and also strengthening of moderate acid sites in NiMo nitride on P doping. All the nitride catalysts have suffered partial sulfidation during initial period of hydrotreating of HGO. HDN activity of NiMo nitride was promoted greatly by the phosphorus content, reached a maximum with P content of 1.6 wt.%. An increased acidity of P-doped NiMo nitrides accelerated C–N bond breaking and thus enhanced the HDN activity. No significant change was observed in HDS of HGO over NiMo/Al2O3 nitride catalyst on P doping.

Graphical abstractThe synthesized P-doped γ-Al2O3 supported nickel molybdenum (NiMo) nitride catalysts were characterized, and tested for HDN and HDS of heavy gas oil (HGO) derived from Athabasca bitumen at industrial conditions.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
γ-Al2O3 support; NiMo nitride; Phosphorus doping; DRIFT of CO adsorption; Hydrodesulfurization; Hydrodenitrogenation; Heavy gas oil
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The effect of phosphorus on hydrotreating property of NiMo/γ-Al2O3 nitride catalyst
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 335, Issue 2, 8 February 2008, Pages 204–210
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