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Hydrodesulfurization of 4,6-DMDBT on a multi-metallic sulfide catalyst with layered structure

Paper ID Volume ID Publish Year Pages File Format Full-Text
41458 45890 2011 7 PDF Available
Title
Hydrodesulfurization of 4,6-DMDBT on a multi-metallic sulfide catalyst with layered structure
Abstract

A multi-metallic NiAlMoW catalyst with layered structure was prepared by surfactant-assisted co-precipitation method using NiAl-layered double hydroxide (NiAl-LDH) as the structure-directing template. By carefully tuning the composition of the layered structure and the synthesis conditions, we have prepared a series of NimAlnMoW catalysts. For the HDS of 4,6-DMDBT, NiAl3MoW-5 shows two times higher intrinsic catalytic activity (based on weight of active metals) compared to that of the commercial CoNiMoW/Al2O3 catalyst. The sulfur content in the model compound could be reduced from 500 ppm to less than 20 ppm using this catalyst under the operation conditions of 3.0 MPa, 300 °C, a WHSV (weight hourly space velocity) of 9 h−1, and H2/oil ratio of 800 Nm3/m3. The synthesized catalysts were characterized by SEM, TEM, XRD, TG/DSC, nitrogen adsorption/desorption isotherms and XRF. This NiAlMoW catalyst has retained the unique layered structure of NiAl-LDH, which can facilitate uniform dispersion of the active species on both the surface and the edge of the layer. It was found that the layered structure has a great impact on the catalytic activity of the HDS reactions.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (135 K)Download as PowerPoint slideResearch highlights▶ The novel multi-metallic NiAlMoW catalyst has a layered structure. ▶ NiAl-LDH acts as the structure-directing template in the preparation of catalyst. ▶ NiAl3MoW-5 shows two times higher intrinsic HDS activity than commercial catalyst. ▶ The active species are highly dispersed on the surfaces and the edges of the layers. ▶ The layered structure has a great impact on the HDS activity of the catalyst.

Keywords
Ultra-deep hydrodesulfurization; Multi-metallic sulfide catalyst; NiAl-LDH; 4,6-Dimethyldibenzothiophene (4,6-DMDBT); Layered structure
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 394, Issues 1–2, 28 February 2011, Pages 18–24
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