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Catalysts 2016, 6(2), 26; doi:10.3390/catal6020026

Steam Reforming of Bio-Ethanol to Produce Hydrogen over Co/CeO2 Catalysts Derived from Ce1−xCoxO2−y Precursors

Research Institute of Energy Frontier, National Institute of Advanced Industrial Science and Technology, AIST, Tsukuba West, Onogawa 16-1, Tsukuba, Ibaraki 305-8569, Japan
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Author to whom correspondence should be addressed.
Academic Editors: Rafael Luque, Sudipta De and Alina M. Balu
Received: 13 November 2015 / Revised: 22 January 2016 / Accepted: 27 January 2016 / Published: 5 February 2016
(This article belongs to the Special Issue Catalytic Conversion of Biomass)
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Abstract

A series of Ce1−xCoxO2−y precursors were prepared by homogeneous precipitation using urea as a precipitant. The Co/CeO2 catalysts obtained from the Ce1−xCoxO2−y precursors were used for the steam reforming of ethanol to produce hydrogen. Co ions could enter the CeO2 lattices to form Ce1−xCoxO2−y mixed oxides at x ≤ 0.2 using the homogeneous precipitation (hp) method. CeO2 was an excellent support for Co metal in the steam reforming of ethanol because a strong interaction between support and metal (SISM) exists in the Co/CeO2 catalysts. Because Co/CeO2 (hp) prepared by homogeneous precipitation possessed a high BET surface area and small Co metal particles, Co/CeO2 (hp) showed a higher ethanol conversion than the Co/CeO2 catalysts prepared using the co-precipitation (cp) method and the impregnation (im) method. The selectivity of CO2 over Co/CeO2 (hp) increased with increasing reaction temperature at from 573 to 673 K, and decreased with increasing reaction temperature above 673 K due to the increase of CO formation. The carbonaceous deposits formed on the catalyst surface during the reaction caused a slow deactivation in the steam reforming of ethanol over Co/CeO2 (hp). The catalytic activity of the used catalysts could be regenerated by an oxidation-reduction treatment, calcined in air at 723 K and then reduced by H2 at 673 K. View Full-Text
Keywords: bio-ethanol; steam reforming; hydrogen; urea hydrolysis; homogeneous precipitation; Co/CeO2 catalyst; Ce1−xCoxO2−y mixed oxide; solid-phase crystallization bio-ethanol; steam reforming; hydrogen; urea hydrolysis; homogeneous precipitation; Co/CeO2 catalyst; Ce1−xCoxO2−y mixed oxide; solid-phase crystallization
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Liu, Y.; Murata, K.; Inaba, M. Steam Reforming of Bio-Ethanol to Produce Hydrogen over Co/CeO2 Catalysts Derived from Ce1−xCoxO2−y Precursors. Catalysts 2016, 6, 26.

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