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Fischer–Tropsch synthesis on a Co/Al2O3 catalyst with CO2 containing syngas

Paper ID Volume ID Publish Year Pages File Format Full-Text
42714 45938 2009 8 PDF Available
Title
Fischer–Tropsch synthesis on a Co/Al2O3 catalyst with CO2 containing syngas
Abstract

Hydrogenation of CO, CO2 and their mixtures has been comparatively studied in this work on a representative cobalt-based catalyst under typical Fischer–Tropsch synthesis conditions (T = 220 °C, P = 20 bar, GHSV = 4800 cm3(STP)/h/gcat, H2/COx = 2.45–4.9 mol/mol). In addition, the interactions of the adopted catalyst with CO, CO2 and their mixtures have been studied by FT-IR spectroscopy. When used alone, both CO and CO2 are easily hydrogenated over the adopted catalyst, with CO2 showing a reactivity higher then CO. However the selectivity of the two processes is extremely different, with over 90% of the products represented by methane in the case of CO2 hydrogenation. No evidence has been found for the involvement of different surface species in CO and CO2 hydrogenation, suggesting that the observed reaction products originate from the same intermediate. It is speculated that the different reactivity of the mixtures CO/H2 and CO2/H2 is due to the different adsorption ability of CO and CO2, which strongly affects the H/C atomic ratio on the catalyst surface. The higher H/C ratio resulting upon CO2 hydrogenation inhibits the chain growth, hence favoring the methanation reaction. In the presence of CO, CO2 is hardly hydrogenated and behaves as an inert species: this has been ascribed to a competition between CO and CO2 for the adsorption on the catalyst active sites.

Graphical abstractHydrogenation of CO, CO2 and their mixtures has been comparatively studied in this work on a representative cobalt-based catalyst under typical Fischer–Tropsch synthesis conditions. In addition, the interactions of the adopted catalyst with CO, CO2 and their mixtures have been studied by FT-IR spectroscopy. When used alone, both CO and CO2 are easily hydrogenated over the adopted catalyst, but the selectivity of the two processes is extremely different. In the presence of CO, CO2 is hardly hydrogenated and behaves essentially as an inert species.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Fischer–Tropsch synthesis; CO2 effect; FT-IR characterization; Cobalt catalysts
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Fischer–Tropsch synthesis on a Co/Al2O3 catalyst with CO2 containing syngas
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 355, Issues 1–2, 28 February 2009, Pages 61–68
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
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