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Catalytic performance of platinum doped tungsten carbide in simultaneous hydrodenitrogenation and hydrodesulphurization

Paper ID Volume ID Publish Year Pages File Format Full-Text
47612 46478 2010 9 PDF Available
Title
Catalytic performance of platinum doped tungsten carbide in simultaneous hydrodenitrogenation and hydrodesulphurization
Abstract

The simultaneous hydrodesulphurization (HDS) and hydrodenitrogenation (HDN) reactions of refractory model compounds were performed for the first time over tungsten carbide doped with platinum before and after preparation (0.3 wt%). It was then compared to that of a pure non-modified W2C. The model compounds were 4,6-dimethyldibenzothiophene (4,6-DMDBT) and carbazole. The catalysts were characterized by X-ray diffraction (XRD). The surface properties were determined by N2 BET specific surface area and chemisorption of CO. Addition of platinum before synthesis of carbide decreased the uptake of CO chemisorption, but did not change significantly the specific surface area and the crystallographic structure of tungsten carbide—β-W2C. Addition of platinum after preparation of carbide did not decreased significantly the specific surface area of W2C but extremely increased the uptake of chemisorption of CO. No influence of platinum on the HDS activity was observed for contact times between 0.08 and 0.31 s. At longer contact time (tc > 0.31 s) the highest activity was observed over W2C–Pt catalyst (platinum doped after preparation) for the HDS of 4,6-DMDBT. The main products were 3,3-DMBPh (along DDS route) and MCHT (along HYD route).A strong influence of platinum, added after preparation (W2C–Pt), was observed for the HDN of carbazole. Indeed, this catalyst was found to be more active in the whole range of applied contact times than W2C and Pt–W2C. It was also more active in the consecutive reaction of isomerization of the main product of the HDN reaction, i.e. bicyclohexyl (BCH) transformed into methylcyclopenthylcyclohexane (MCPCH). Furthermore the activity in HDN over the W2C–Pt catalyst was shown to be highly dependent on the amount of metallic sites introduced by platinum.

Keywords
Tungsten carbide (W2C); Platinum; Hydrodesulphurization (HDS); Hydrodenitrogenation (HDN); 4,6-Dimethyldibenzothiophene; Carbazole; Hydrogenation
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Catalytic performance of platinum doped tungsten carbide in simultaneous hydrodenitrogenation and hydrodesulphurization
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 93, Issues 3–4, 12 January 2010, Pages 241–249
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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
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Any Questions? feel free to contact us