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Carbon nanotube-supported Fe–Mn nanoparticles: A model catalyst for direct conversion of syngas to lower olefins

Paper ID Volume ID Publish Year Pages File Format Full-Text
54624 47017 2013 9 PDF Available
Title
Carbon nanotube-supported Fe–Mn nanoparticles: A model catalyst for direct conversion of syngas to lower olefins
Abstract

•Monodisperse Fe3−xMnxO4/CNT (x = 0–0.5) for FTS reaction is prepared.•Adding small amount of Mn to Fe/CNT does not affect FTS activity.•A small amount of Mn in Fe/CNT improves C2–C4 olefin and C5+ productions.•An excess of Mn in Fe/CNT can lead to a significant decrease in FTS activity.•Mn oxide in Fe/CNT retards the carburization of metallic Fe to iron carbides.

Carbon nanotube (CNT)-supported monodisperse Fe3−xMnxO4 (x = 0–0.5) nanoparticles in which Mn has an intimate contact with Fe were synthesized and used as a model catalyst for investigating the promotion effect of Mn oxide on the iron-based catalysts for Fischer–Tropsch synthesis (FTS) reaction. It was found that incorporation of Mn oxide (Mn/Fe = 0.024–0.2) into a Fe3O4/CNT catalyst promoted the reduction of Fe3O4 to FeO, but retarded the further reduction of FeO to metallic Fe. Incorporation of small amount of Mn (Mn/Fe ≤ 0.01) into the iron catalyst results in an increase in C5+ yield and C2–C4 olefin selectivity without any loss in FTS activity. However, the total selectivity of C2–C4 hydrocarbons is almost not affected by the addition of Mn oxide. An excess of Mn oxide in the catalysts (Mn/Fe > 0.024) can lead to a significant decrease in FTS activity with no further improvement in C2–C4 olefin selectivity. The results of temperature-dependent XRD study on the Fe3O4/CNT and Fe2.73Mn0.27O4/CNT catalysts under H2/CO = 1 mixture suggest that the decreasing in FTS activity on the Fe3−xMnxO4/CNT catalysts with an excess of Mn may have resulted from that the rate of carburization of metallic Fe is retarded by the Mn oxide species.

Graphical abstractSmall amount of Mn oxide closely associated with the iron nanoparticles improves C2–C4 olefin and C5+ productions of a CNT supported iorn catalyst. An excess of Mn significantly decreases the catalytic activity.Figure optionsDownload full-size imageDownload high-quality image (227 K)Download as PowerPoint slide

Keywords
Fischer–Tropsch synthesis; Monodisperse Fe–Mn nanoparticles; Carbon nanotube support; Lower olefins; Mn promotion; In situ XRD
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Carbon nanotube-supported Fe–Mn nanoparticles: A model catalyst for direct conversion of syngas to lower olefins
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 215, 15 October 2013, Pages 86–94
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