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Thermocatalytic decomposition of propane for pure hydrogen production and subsequent carbon gasification: Activity and long-term stability of Ni/Al2O3 based catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
53828 46986 2015 7 PDF Available
Title
Thermocatalytic decomposition of propane for pure hydrogen production and subsequent carbon gasification: Activity and long-term stability of Ni/Al2O3 based catalysts
Abstract

•Ni/Al2O3 catalysts were tested for the thermocatalytic decomposition of propane with subsequent carbon gasification.•A catalyst containing 40 wt.% Ni shows high H2 yields for 65 h.•Stability of catalysts depends on the nickel loading.•H2 yields depend on the nickel loadings at lower temperatures.•CO is the main product during catalyst regeneration as a reaction front is moving through the reactor and CO2 is converted into CO.

Ni/Al2O3 catalysts with nickel loadings from 10 to 40 wt.% prepared by wet impregnation have been tested for the thermocatalytic decomposition of propane in the temperature range from 700 to 1100 °C in a fixed bed reactor. Full conversion of propane was observed in all cases. The hydrogen yield was found to increase at higher reaction temperature, at lower temperatures significant quantities of CH4 were observed in the product gas. The Ni loading determined stability of the catalyst. After performing the catalytic decomposition reaction for a certain time, the carbon formed on the catalyst surface was removed by combustion with air. During this regeneration process carbon monoxide was always the main product. Repeated cycles of decomposition and regeneration were carried out. By using an automated control device, it was possible to ensure a continuous operation of the reactor for 65 h. For this period, stable H2 yield was observed with a catalyst containing 40 wt.% Ni supported by Al2O3. Fresh and spent catalysts were analyzed by BET, X-ray fluorescence (XRF), scanning electron microscopy (SEM) and X-ray diffraction (XRD). Carbon formed by the decomposition reaction was analyzed by thermogravimetric analysis (TGA) and SEM.

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Keywords
Propane; Thermocatalytic decomposition; Carbon gasification; Cyclic reaction; Nickel
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Thermocatalytic decomposition of propane for pure hydrogen production and subsequent carbon gasification: Activity and long-term stability of Ni/Al2O3 based catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 242, Part A, 15 March 2015, Pages 139–145
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