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Ceria-supported nickel borate as a sulfur-tolerant catalyst for autothermal reforming of a proxy jet fuel

Paper ID Volume ID Publish Year Pages File Format Full-Text
53402 46968 2016 9 PDF Available
Title
Ceria-supported nickel borate as a sulfur-tolerant catalyst for autothermal reforming of a proxy jet fuel
Abstract

•Ceria-supported nickel borate catalyzes autothermal reforming of a proxy fuel.•Nickel borate, as co-catalyst, enhances sulfur tolerance of the Ni catalytic site.•Doping composition of ceria significantly affects stability of nickel borate.

Catalytic reforming of liquid hydrocarbons to produce H2-enriched fuel in an auxiliary power unit is essential to the operation of fuel cell on board. This study explored ceria-supported nickel borate [Ni3(BO3)2] catalyst for conducting the above reaction under autothermal reforming (ATR) condition. In the present catalytic system operating at 750 °C and under purge stream of feed, nickel borate undergoes partial degradation whose degree depends on the type of support used to release catalytically reactive tiny Ni0 metal crystallite and B2O3. To achieve a high fuel conversion (>95%), it is crucial to maintain a dominant ratio of nickel borate versus Ni0 nanocrystallites as the reactive site. Typically, more than 90% nickel borate remains on the Y-doped ceria (CYO) while almost all nickel borate degrade to Ni0 and B2O3 on the Gd-doped ceria (CGO) after 24 h ATR of the proxy fuel comprising dodecane, naphthalene (10 wt%) and thiophene (containing 100 pm S). In consequence, the former catalyst shows a higher fuel conversion profile than the latter by 15–20%. It is proposed that nickel borate itself is a cocatalyst to induce cracking of fuel molecules, which provides smaller hydrocarbon species for the reforming on Ni0 crystallites, and promotes sulfur tolerance of Ni0 crystallites to a large extent on CYO according to the XPS and NMR characterizations.

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Keywords
Doped-ceria; Nickel borate; Autothermal reforming; Co-catalyst; Sulfur poisoning
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Ceria-supported nickel borate as a sulfur-tolerant catalyst for autothermal reforming of a proxy jet fuel
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 263, 1 April 2016, Pages 52–60
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