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Unsupported trimetallic CoMoW sulfide HDS catalysts prepared by in situ decomposition of sulfur-containing precursors

Paper ID Volume ID Publish Year Pages File Format Full-Text
53914 46989 2015 10 PDF Available
Title
Unsupported trimetallic CoMoW sulfide HDS catalysts prepared by in situ decomposition of sulfur-containing precursors
Abstract

•Unsupported CoMoW sulfide HDS catalysts were prepared by in situ decomposition of sulfur-containing precursors.•The nature of alkyl group affects the specific surface area, structure and results in HDS activity.•The best catalyst was synthesized from ammonium thiosalts of Mo and W without alkyl chain.•The use of tetraalkylammonium thiomolybdotungstate precursors decreases the HDS activity.

Unsupported CoMoW sulfide hydrodesulfurization (HDS) catalysts were prepared by in situ decomposition of sulfur-containing precursors. The precursors were synthesized by reaction of the ammonium and tetraalkylammonium thiomolybdotungstates (R4N)4MoWS8 (where R = H, methyl, propyl) with an aqueous solution of CoCl2·6H2O in order to give molar ratios of Co/[Co + (Mo + W)] = 0.3. Co-promoted precursors were then in situ decomposed during the HDS of dibenzothiophene (DBT)-producing CoMoW sulfide catalysts. Solids were analyzed after the in situ activation by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction and for textural properties by using the BET and BJH methods. Catalysts with relatively high surface area and type IV N2 adsorption–desorption isotherms were obtained. The use of the Co-promoted ammonium thiomolybdotungstate as precursor was found to be beneficial in the catalytic activity. The positive role of carbon in monometallic HDS catalysts confirmed by Chianelli and Berhault was not evidenced here since the catalytic activity decreased with the introduction of an alkyl group in the precursor.

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Keywords
Unsupported; Co–Mo–W sulfide; In situ decomposition; Tetraalkylammonium thiomolybdotungstates
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Unsupported trimetallic CoMoW sulfide HDS catalysts prepared by in situ decomposition of sulfur-containing precursors
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 250, 15 July 2015, Pages 28–37
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
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