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Citric acid loading for MoS2-based catalysts supported on SBA-15. New catalytic materials with high hydrogenolysis ability in hydrodesulfurization

Paper ID Volume ID Publish Year Pages File Format Full-Text
45993 46428 2013 9 PDF Available
Title
Citric acid loading for MoS2-based catalysts supported on SBA-15. New catalytic materials with high hydrogenolysis ability in hydrodesulfurization
Abstract

The aim of this work is to get a deeper insight into the effect of citric acid (CA) loading in NiMo sulfided catalysts supported on SBA-15 on their behavior in hydrodesulfurization (HDS). Catalysts were prepared by simultaneous impregnation of Ni, Mo and CA species, varying the CA amount in aqueous solution. After the impregnation, NiMoCA catalysts were dried at 100 °C under air atmosphere without calcination. Catalysts were characterized by several techniques (TGA, N2 physisorption, small-angle and powder XRD, FT-IR, UV–vis DRS, TPR, elemental analysis and HRTEM) and tested in HDS of dibenzothiophene (DBT). N2 physisorption, small-angle XRD and FT-IR showed the adsorption of CA on the SBA-15 surface. XRD characterization demonstrated that Ni and Mo oxide species were well dispersed in all catalysts. UV–vis DRS revealed better dispersion of Mo species with the increase of CA loading. TPR experiments exhibited an important effect of CA under reducing atmosphere; it can be reduced to leave carbon on the catalytic materials. This observation was confirmed by carbon analysis which showed an increase in the amount of carbon in the same direction than the CA loading. HDS of DBT showed differences in activity and selectivity of the catalysts prepared with different CA loading. We observed outstanding promotion of direct desulfurization (DDS) route with increasing the CA amount. The preference of DBT to react over NiMoCA catalysts toward DDS route was an unexpected behavior.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlight► NiMo catalysts supported on SBA-15 were prepared with different citric acid (CA) loading. ► CA modifies the catalysts’ properties when its amount is increased. ► High hydrogenolysis ability of these catalysts in hydrodesulfurization of dibenzothiophene was observed due to CA amount.

Keywords
Hydrodesulfurization; SBA-15; Citric acid; Dibenzothiophene; Carbon
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Citric acid loading for MoS2-based catalysts supported on SBA-15. New catalytic materials with high hydrogenolysis ability in hydrodesulfurization
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 129, 17 January 2013, Pages 137–145
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