fulltext.study @t Gmail

Efficient hydrodesulfurization catalysts based on Keggin polyoxometalates

Paper ID Volume ID Publish Year Pages File Format Full-Text
39074 45805 2015 9 PDF Available
Title
Efficient hydrodesulfurization catalysts based on Keggin polyoxometalates
Abstract

•HDS pre-catalysts prepared via polyoxometalate (POM) route retain the POM structure and acidity.•The structure and acidity lost upon sulfidation to form HDS active phase(s).•HDS activity increases in the series of supports: SiO2 < TiO2 < γ-Al2O3.•POM-based CoMo catalyst more active and selective in thiophene HDS than industrial counterpart.

Bulk and supported hydrodesulfurization catalysts based on Mo and W and containing Co or Ni as promoters and phosphorus as a modifier are prepared through the polyoxometalate route using Keggin type phosphomolybdates and phosphotungstates and tested in the HDS of thiophene at 350–400 °C and 1 bar pressure. The corresponding oxidic pre-catalysts retain intact Keggin structure of the parent polyoxometalates and possess Brønsted and Lewis acidity. In the course of sulfidation, the oxidic pre-catalysts transform into an active sulfidic phase with the loss of Keggin structure and catalyst acidity. Catalyst activity increases in the order of supports: SiO2 < TiO2 < γ-Al2O3. CoMoP/γ-Al2O3 catalyst prepared through the polyoxometalate route shows higher HDS activity and butene selectivity than industrial catalyst of comparable composition. The results indicate that polyoxometalate catalyst preparation route can be considered a performance enhancement methodology for HDS catalysis.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (107 K)Download as PowerPoint slide

Keywords
Desulfurization; Thiophene; Heterogeneous catalysis; Polyoxometalate; Molybdenum; Cobalt
First Page Preview
Efficient hydrodesulfurization catalysts based on Keggin polyoxometalates
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 508, November 2015, Pages 16–24
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