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Fischer–Tropsch synthesis on Co/ZnO catalyst—Effect of pretreatment procedure

Paper ID Volume ID Publish Year Pages File Format Full-Text
41384 45887 2011 7 PDF Available
Title
Fischer–Tropsch synthesis on Co/ZnO catalyst—Effect of pretreatment procedure
Abstract

The effect of catalyst pretreatment, using hydrogen or carbon monoxide, on the activity and selectivity of cobalt on ZnO catalyst (10 wt% Co/ZnO) during Fischer–Tropsch synthesis was studied in a fixed bed reactor. Catalyst reduced with hydrogen had higher activity and higher olefin content, and produced less methane than the CO activated catalyst. Catalysts were characterized by means of Brunauer–Emmett–Teller (BET), X-ray diffraction (XRD), temperature programmed reduction (TPR), and hydrogen chemisorption (H2-TPD) with pulse re-oxidation. Reduction of Co3O4 occurs in two stages during H2-TPR and CO-TPR. In the latter case CoO, metallic cobalt, cobalt carbides (CoxC; x = 2 or 3) and carbon (from CO disproportionation) are formed during the reduction process. The existence of Co0 along with CoO and CoxC, indicates a possibility of two reaction paths for formation of CoxC from CoO: the direct path (CoO → CoxC) and a series reaction via Co0 (i.e. CoO → Co0 → CoxC).

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (235 K)Download as PowerPoint slideHighlights► H2-activated Co/ZnO catalyst was more active than the CO-activated catalyst. ► H2-activated catalyst had higher olefin content and lower methane selectivity. ► Both cobalt carbide (CoxC; x = 2 or 3) and metallic cobalt were found after CO pretreatments.

Keywords
Fischer–Tropsch synthesis; Co/ZnO catalyst; Hydrogen and carbon monoxide activation; Catalyst characterization
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Fischer–Tropsch synthesis on Co/ZnO catalyst—Effect of pretreatment procedure
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 404, Issues 1–2, 19 September 2011, Pages 74–80
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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