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Comparison and performance of different sulphided Ti-loaded mesostructured silica-supported CoMo catalysts in deep HDS

Paper ID Volume ID Publish Year Pages File Format Full-Text
42907 45946 2008 14 PDF Available
Title
Comparison and performance of different sulphided Ti-loaded mesostructured silica-supported CoMo catalysts in deep HDS
Abstract

Ti-loaded mesostructured silica materials (HMS, MCM-41 and SBA-15), with Si/Ti atomic ratio of 40, were used for the preparation of supported CoMo catalysts. The catalysts were tested in the reaction of HDS of 4,6-DMDBT carried out in a continuous-flow microreactor in the liquid-phase. The samples were characterized by DRS UV-Vis, XPS, Micro-Raman spectroscopy, SBET, XRD, TPR, FT-IR of adsorbed NO and pyridine. The type of mesostructured material has an important effect on the dispersion of both Mo and Co species. The highest catalytic performance in the HDS of 4,6-DMDBT was observed for the catalysts prepared on the Ti-HMS material. The superior performance of this sample was related to the following factors: (i) larger specific area value, (ii) higher acidity, (iii) higher dispersion of the Co and Mo species, and (iv) the lower reduction temperature of the supported species. Traditional reaction pathways for the HDS of 4,6-DMDBT were observed on the conventional CoMo/γ-Al2O3 and CoMo/Ti-SBA-15 samples, while the CoMo/Ti-MCM-41 and CoMo/Ti-HMS samples show some dealkylation of the alkyl groups in the 4,6-DMDBT molecule (producing DBT). Additionally, the CoMo/Ti-HMS sample recorded the isomerization of the one alkyl group in the 4,6-DMDBT molecule. The differences observed in the reaction pathways via the HDS of 4,6-DMDBT are related to the acidity of the samples.

Graphical abstractMesostructured Ti-containing mesoporous materials (HMS, MCM-41 and SBA-15), with Si/Ti atomic ratio of 40, were used for the preparation of supported CoMo catalysts. The catalysts were tested in the reaction of HDS of 4,6-DMDBT carried out in a continuous-flow microreactor in the liquid-phase. The type of mesostructured material has an important effect on the dispersion of both Mo and Co species. The highest catalytic performance in the HDS of 4,6-DMDBT was observed for the catalysts prepared on the Ti-HMS material. The superior performance of this sample was related to the following factors: (i) larger specific area value, (ii) higher acidity, (iii) higher dispersion of the Co and Mo species, and (iv) the lower reduction temperature of the supported species.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Hydrotreating catalysts; Mesoporous materials; CoMo catalysts; Hydrodesulphurization; MCM-41; SBA-15 and HMS materials; Ti effect
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Comparison and performance of different sulphided Ti-loaded mesostructured silica-supported CoMo catalysts in deep HDS
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 347, Issue 2, 15 September 2008, Pages 148–161
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