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Characterization of cobalt Fischer–Tropsch catalysts: 2. Rare earth-promoted cobalt-silica gel catalysts prepared by wet impregnation

Paper ID Volume ID Publish Year Pages File Format Full-Text
42046 45908 2010 10 PDF Available
Title
Characterization of cobalt Fischer–Tropsch catalysts: 2. Rare earth-promoted cobalt-silica gel catalysts prepared by wet impregnation
Abstract

Rare earth (RE) promoted cobalt-silica gel catalysts for Fischer–Tropsch (F–T) synthesis were investigated systematically by various analytical techniques. The addition of small amounts of praseodymium to cobalt-silica gel catalysts greatly enhances their activity and selectivity in the F–T synthesis. The optimal atomic ratio of Pr/Co for 6% cobalt-silica gel catalysts was found to be between 0.26 and 0.35. Spectroscopic and other experimental results show that impregnated praseodymium readily substitutes the surface silicon atoms to form negatively charged centres on the surface of the support. Due to the presence of praseodymium, the deposited cobalt species can partially react with the support. Consequently, significant amounts of surface cobalt silicates or hydrosilicates can be formed. Most of these species undergo reduction during activation and can be converted to a metallic cobalt phase that remains incorporated at the silica surface.

Graphical abstractRare earth (RE) promoted cobalt-silica gel catalysts for Fischer–Tropsch (F–T) synthesis were prepared by wet impregnation and were investigated systematically. The addition of small amounts of praseodymium to cobalt-silica gel catalysts enhances their activity and selectivity in the F–T synthesis greatly. The optimal atomic ratio of Pr/Co for 6% cobalt-silica gel catalysts was found to be between 0.26 and 0.35.Figure optionsDownload full-size imageDownload high-quality image (104 K)Download as PowerPoint slide

Keywords
Catalyst characterization; Cobalt-silica gel catalyst; Rare earth; Promoter; Wet impregnation
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Characterization of cobalt Fischer–Tropsch catalysts: 2. Rare earth-promoted cobalt-silica gel catalysts prepared by wet impregnation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 381, Issues 1–2, 15 June 2010, Pages 216–225
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
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