fulltext.study @t Gmail

Promotion of Re/Al2O3 and Re/C catalysts by Ni sulfide in the HDS and HDN of gas oil: Effects of Ni loading and support

Paper ID Volume ID Publish Year Pages File Format Full-Text
43992 45998 2007 12 PDF Available
Title
Promotion of Re/Al2O3 and Re/C catalysts by Ni sulfide in the HDS and HDN of gas oil: Effects of Ni loading and support
Abstract

Two series of NiRe catalysts supported on γ-Al2O3 and activated carbon having constant wt.% Re2O3 content (3.51 and 1.97, respectively) and various Ni/Re atomic ratios were prepared to investigate the promoting action of Ni on sulfided Re catalysts in the simultaneous hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) of gas oil. The catalysts were characterized using textural analysis, X-ray diffraction, diffuse reflectance spectroscopy, energy-dispersive X-ray analysis and X-ray photoelectron spectroscopy. On both Ni(x)Re/Al2O3 and Ni(x)Re/C catalysts, the dependence of HDS and HDN activities showed initially an increase and subsequent decrease with increasing Ni content, with optimum Ni/Re atomic ratios of ∼0.94 for Ni(x)Re/Al2O3 catalysts and ∼1.25 for Ni(x)Re/C catalysts. The decline in activity was attributed to a reduction in Re dispersion and a low Ni sulfidation for the alumina-supported catalysts, and to a separate location of Re and Ni on the support surface, as well as to an incomplete Ni sulfidation for the carbon-supported catalysts. The synergetic effect in activity observed between Ni and Re was slightly higher for HDS than for HDN, especially at low reaction temperature (325 °C) and on carbon-supported catalysts. On the basis of these promotional effects on catalytic activities and HDN/HDS selectivity, and the characterization results, the nature of the promotion observed on NiRe supported catalysts was discussed.

Graphical abstractTwo series of NiRe catalysts supported on γ-Al2O3 and activated carbon having constant renium content and various Ni/Re atomic ratios were prepared to investigate the promoting action of Ni on Re in the simultaneous hydrodesulfurization and hydrodenitrogenation of gas oil at 325, 350 and 375 °C. On both supports, the dependence of activities showed initially an increase and subsequent decrease with increasing Ni content, with optimum Ni/Re atomic ratios of ∼0.94 for Ni(x)Re/Al2O3 catalysts and ∼1.25 for Ni(x)Re/C catalysts. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Hydrodesulfurization (HDS); Hydrodenitrogenation (HDN); Re sulfide catalyst; Ni-Re catalyst
First Page Preview
Promotion of Re/Al2O3 and Re/C catalysts by Ni sulfide in the HDS and HDN of gas oil: Effects of Ni loading and support
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 319, 1 March 2007, Pages 218–229
Authors
, , , , , , ,
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