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A new approach in the evaluation of the support effect for NiMo hydrodesulfurization catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
41289 45884 2011 11 PDF Available
Title
A new approach in the evaluation of the support effect for NiMo hydrodesulfurization catalysts
Abstract

To evaluate the intrinsic effect of some supports (γ-Al2O3, SiO2, TiO2, ZrO2) on the activity of hydrodesulfurization (HDS) catalysts, NiMo catalysts were prepared by adding nickel acetylacetonate (Ni(acac)2) to supported molybdenum sulfide. The catalysts were characterized by X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy and then tested in HDS of thiophene and 4,6-dimethyldibenzothiophene (4,6-DMDBT). This preparation method allowed obtaining well-promoted catalysts. A higher percentage (69–80%) of NiMoS phase was observed by XPS for these catalysts than for traditional co-impregnated catalysts (60%). In addition, the catalytic activity measured with those promoted systems was improved especially for TiO2 and ZrO2 supported NiMoS catalysts. By combining characterizations, geometrical model and catalytic activities, apparent HDS activities per NiMoS site were evaluated on each support. The high quality of NiMoS sites suggests that Type-II sites have been formed on silica.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (128 K)Download as PowerPoint slideHighlights► Comparison of MoS2 and NiMoS catalysts onto alumina, silice, titania and zirconia. ► Ni-promotion of MoS2-supported catalysts by using Ni(acac)2. ► XPS quantification of NiMoS phase onto different supports. ► Intrinsic catalytic HDS activities of NiMoS active sites.

Keywords
Preparation; NiMo supported catalysts; Hydrodesulfurization; Support effect; Ni(acac)2; XPS
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A new approach in the evaluation of the support effect for NiMo hydrodesulfurization catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 407, Issues 1–2, 4 November 2011, Pages 29–39
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
Online Support
Any Questions? feel free to contact us