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HDN and HDS of different gas oils derived from Athabasca bitumen over phosphorus-doped NiMo/γ-Al2O3 carbides

Paper ID Volume ID Publish Year Pages File Format Full-Text
49086 46547 2006 11 PDF Available
Title
HDN and HDS of different gas oils derived from Athabasca bitumen over phosphorus-doped NiMo/γ-Al2O3 carbides
Abstract

A series of phosphorous-doped γ-Al2O3 supported Ni–Mo bimetallic carbide catalysts (PNiMo2C/Al2O3) with 0–4.5 wt.% Ni, 13 wt.% Mo and 2.5 wt.% P were synthesized and characterized by elemental analysis, pulsed CO chemisorption, surface area measurement, X-ray diffraction (XRD), near-edge X-ray absorption fine structure (NEXAFS), DRIFT spectroscopy of CO adsorption and H2 temperature programmed reduction. XRD indicated the formation of pure β-Mo2C phase in these catalysts, whereas the near edge X-ray absorption fine structure of C K-edge confirmed the formation of carbidic carbons. DRIFT spectra of adsorbed CO revealed that Ni or P addition to Mo2C/Al2O3 catalyst not only increases the number of surface Mo sites, but also promotes the reducibility of Mo. The partial sulfidation of Mo2C phase in the presence of H2S/H2 gas mixture at 370 °C was evidenced by DRIFTS of adsorbed CO. The HDN and HDS activities of these PNiMo2C/Al2O3 catalysts were performed in a trickle bed reactor using light gas oil (LGO) and heavy gas oil (HGO) derived from Athabasca bitumen at 8.8 MPa and compared with the unpromoted Mo carbide (Mo2C/Al2O3), P doped Mo carbide (PMo2C/Al2O3) and Ni promoted Mo carbide (NiMo2C/Al2O3). The P doped Ni–Mo bimetallic carbide catalysts showed enhanced HDN activity compared to the Mo2C/Al2O3, NiMo2C/Al2O3 and PMo2C/Al2O3 catalysts. The maximum N and S conversions, respectively, were obtained over PNiMo2C/Al2O3 and NiMo2C/Al2O3 catalysts containing 2.5 wt.% Ni.

Keywords
Mo2C/γ-Al2O3; P doped Ni–Mo carbide; DRIFTS of CO adsorption; C K-edge NEXAFS; Hydrodesulfurization; Hydrodenitrogenation; Gas oil
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HDN and HDS of different gas oils derived from Athabasca bitumen over phosphorus-doped NiMo/γ-Al2O3 carbides
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 68, Issues 1–2, 26 October 2006, Pages 38–48
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