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The effect of sulfur addition during the preparation of Co/Zn/TiO2 Fischer–Tropsch catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
43053 45953 2008 9 PDF Available
Title
The effect of sulfur addition during the preparation of Co/Zn/TiO2 Fischer–Tropsch catalysts
Abstract

The effect of sulfur on Co(10%)/Zn(x wt%)/TiO2 (x = 0 and 10) catalysts was investigated by TPR, XPS and Fischer–Tropsch (FT) reactor studies. The catalysts were prepared by impregnating different amounts of sulfur on Co(10%)/Zn(x wt%)/TiO2(x = 0 and 10) catalysts, using ammonium sulfide (20% in water) as a sulfur precursor. The effect of changing the order of impregnating cobalt, zinc and the sulfur precursor was also investigated. Based on the XPS results, impregnation of different amounts of sulfur on Co/Zn(x wt%)/TiO2(x = 0 and 10) catalysts indicated that sulfur preferentially reacts with cobalt and zinc instead of titania and blocked the active sites for FT reactions. These catalysts were inactive towards FT synthesis. Impregnating sulfur onto TiO2 prior to Co and Zn addition gave a Co/Zn/S/TiO2 catalyst that showed lower FT activity when compared to the unsulfided Co/Zn/TiO2 catalyst. XPS data revealed that sulfur reacted with titania and zinc as well as cobalt species prior to FT synthesis. A drastic increase in the C1–C11 selectivity and a decrease in the C12+ selectivities were observed for the sulfided catalysts (Co/Zn/S/TiO2 and Co/S/Zn/TiO2). The FT results correlated with the XPS and TPR results. The unsulfided catalysts with or without zinc produced higher molecular weight products (C12+) and less methane when compared to the sulfided catalysts. A model is proposed that explains the reactions of sulfur with Zn, Co and TiO2 and is consistent with the characterisation and activity results.

Graphical abstractThe effect of changing the order of impregnating cobalt, zinc and a sulfur precursor (ammonium sulfide) on Co(10%)/Zn(x wt%)/TiO2 (x = 0, 10) catalysts was investigated by TPR, XPS and Fischer–Tropsch reactor studies. A model is proposed that explains the reactions of sulfur with Zn, Co and TiO2 and is consistent with the characterisation and activity results.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Fischer–Tropsch catalysis; Cobalt; Zinc; Sulfur; Titania; XPS
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The effect of sulfur addition during the preparation of Co/Zn/TiO2 Fischer–Tropsch catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 340, Issue 1, 15 May 2008, Pages 7–15
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