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

Catalysts

Megumu Inaba¹  Yanyong Liu¹  Kazuhisa Murata¹ 

[1] Research Institute of Energy Frontier, National Institute of Advanced Industrial Science and Technology, AIST, Tsukuba West, Onogawa 16-1, Tsukuba, Ibaraki 305-8569, Japan;

关键词: bio-ethanol;    steam reforming;    hydrogen;    urea hydrolysis;    homogeneous precipitation;    Co/CeO2 catalyst;    Ce1−xCoxO2−y mixed oxide;    solid-phase crystallization;   

DOI  :  10.3390/catal6020026

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown