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Evaluation of molybdenum-modified alumina support materials for Co-based Fischer-Tropsch catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
43807 45989 2008 8 PDF Available
Title
Evaluation of molybdenum-modified alumina support materials for Co-based Fischer-Tropsch catalysts
Abstract

The choice of a support or promoter may influence the activity and selectivity of a Fischer-Tropsch catalyst. In this study the effect of modification of an alumina support with molybdenum on the performance of Co/γ-Al2O3-catalysts is investigated. The addition of molybdenum leads to a strong decrease in the available metal surface area and a higher acidity in the reduced catalyst. Carbon monoxide can adsorb both on molybdenum sites within the catalysts and on metallic sites. The strength of adsorption of CO on metallic sites increases due to the presence of molybdenum in the catalyst.The initial activity in the Fischer-Tropsch synthesis per unit metal surface area does not change much, but molybdenum-modified catalysts deactivate faster. The selectivity of molybdenum-modified Co/γ-Al2O3 catalysts during the Fischer-Tropsch synthesis is strongly affected by the presence of the acid sites within the catalyst. The enhanced extent of double bond isomerisation on the acidic sites results in a decrease in the chain growth probability, and in an increase in the amount of branched compounds formed in the Fischer-Tropsch synthesis over metallic cobalt sites.

Graphical abstractThe selectivity of molybdenum-modified Co/γ-Al2O3 catalysts during the Fischer-Tropsch synthesis is strongly affected by the presence of the acid sites within the catalyst, whose presence results in enhanced extent of double bond isomerisation yielding a decrease in the chain growth probability, and an increase in the amount of branched compounds formed in the cobalt catalysed Fischer-Tropsch synthesis.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Fischer-Tropsch; Acidity; Cobalt; Molybdenum; Branched hydrocarbons
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Evaluation of molybdenum-modified alumina support materials for Co-based Fischer-Tropsch catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 335, Issue 1, 1 February 2008, Pages 56–63
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