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Steam reforming of biomass tar model compound at relatively low steam-to-carbon condition over CaO-doped nickel–iron alloy supported over iron–alumina catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
39522 45826 2015 12 PDF Available
Title
Steam reforming of biomass tar model compound at relatively low steam-to-carbon condition over CaO-doped nickel–iron alloy supported over iron–alumina catalysts
Abstract

•SRT over CaO doped Ni–Fe alloy supported Al2O3–Fe2O3 catalysts at S/C = 2.•Ni/Ca(1.5)–Fe–Al catalyst gave >80% of toluene conversion for 22 h runtime.•Fe plays a co-catalyst role by forming Ni–Fe alloy particles.•Ni/Ca(1.5)–Fe–Al catalyst can be able to activate H2O at lower temperature than others.•Ni–Fe alloy was confirmed in Ni/Ca(1.5)–Fe–Al catalyst and stable even after 22 h.

CaO doped iron–alumina-supported nickel–iron alloy catalysts were tested in a fixed-bed reactor for steam reforming of toluene as a biomass tar model compound at a relatively low steam-to-carbon (S/C) ratio of 2. The influence of doping CaO to iron–alumina support was also explored for the steam reforming reaction. Ni supported on a CaO(1.5)–Fe2O3–Al2O3 support (Ni/Ca(1.5)–Fe–Al) gave superior catalytic performance in terms of activity and stability over other catalysts. Ni/Ca(1.5)–Fe–Al gave a toluene conversion of more than 80% for a period of 22 h testing at a S/C ratio of 2. XRD analysis showed that the Ni–Fe alloys formed were stable throughout the reforming reaction. It was observed from XPS results that the surface of the reduced Ni/Ca(1.5)–Fe–Al catalyst was enriched with Fe species compared to other catalysts. These enriched surface Fe species play the role of co-catalysts by increasing the coverage of oxygen species during the reforming reaction to enhance the reaction of toluene and to suppress coke formation. The temperature-programmed surface reaction (TPSR) with water reveals that the Ni/Ca(1.5)–Fe–Al catalyst can activate water molecule at relatively lower temperature over other CaO doped catalysts. TGA analysis on spent catalysts reveals that all CaO-containing catalysts generally result in lower carbon formation rates as compared to Ni/Fe–Al catalyst.

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Keywords
Hydrogen production; Nickel–iron alloy; Biomass; Toluene steam reforming; CaO promoted iron–alumina
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Steam reforming of biomass tar model compound at relatively low steam-to-carbon condition over CaO-doped nickel–iron alloy supported over iron–alumina catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 490, 25 January 2015, Pages 24–35
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