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Fischer–Tropsch synthesis on sulphur poisoned Co/Al2O3 catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
43446 45970 2007 8 PDF Available
Title
Fischer–Tropsch synthesis on sulphur poisoned Co/Al2O3 catalyst
Abstract

The effect of sulphur poisoning (in the range 0–2000 ppm) on the characteristics and catalytic performances in the Fischer–Tropsch synthesis (FTS) of a bench-scale alumina supported cobalt catalyst is investigated in this study. It is found that sulphur did not lead to appreciable variations in the catalyst morphological characteristics; however, the catalyst reducibility/hydrogenating capability is significantly modified upon increasing the sulphur loading.The comparison between the catalytic performances of the sulphured samples pointed out that the presence of sulphur remarkably affected the productivity and the selectivity of the reaction. In particular for low S amounts (<100 ppm) the CO conversion is decreased whereas the product distribution is not significantly affected; at higher S loadings a significant decrease in the formation of heavier products is observed along with a decrease in CO conversion. This leads to significant changes in the selectivity of the reaction.These effects have been tentatively associated with different effects of sulphur on the catalyst active sites, i.e. on the sites (or site ensembles) responsible for CO hydrogenation and for the chain growth processes. Finally, the experimental data of CO conversion decay with S-loading were nicely described according to a simple deactivation model which implies a strong effect of sulphur on the catalyst active sites.

Graphical abstractSulphur ex-situ poisoning of a state-of-the-art cobalt based Fischer–Tropsch catalyst has been studied in the range 0–2000 ppm. The sulphur presence induces a decrease of the catalyst reducibility, hydrogenating ability, FT productivity and high molecular weight product selectivity. Four deactivation models, considering different dependences of the catalyst activity on the sulphur content, were used to fit experimental data.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Fischer–Tropsch synthesis; Catalyst deactivation; Sulphur poisoning; Cobalt
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 330, 10 October 2007, Pages 49–56
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
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