In situ XANES study of Cobalt in Co-Ce-Al catalyst applied to Steam Reforming of Ethanol reaction

被引：20
作者：
Pastore de Lima, Arthur E. [1 ,2 ]
de Oliveira, Daniela C. [1 ]
机构：
[1] LNLS, Brazilian Synchrotron Light Lab, Caixa Postal 6192, BR-13083970 Campinas, SP, Brazil
[2] Univ Estadual Campinas, UNICAMP, Campinas, SP, Brazil
来源：
CATALYSIS TODAY | 2017年 / 283卷
基金：
巴西圣保罗研究基金会;
关键词：
Hydrogen; Ethanol; Ceria; Catalyst; Cobalt; XANES; HYDROTALCITE-LIKE PRECURSORS; WATER-GAS-SHIFT; HYDROGEN-PRODUCTION; BIO-ETHANOL; DEACTIVATION; MECHANISM; SUPPORT; SYSTEMS; H-2; RH;
D O I：
10.1016/j.cattod.2016.02.029
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The effect of ceria in cobalt-ceria-alumina catalyst was studied using in situ X-ray near edge spectroscopy (XANES) at Co K-edge and Ce L-III-edge. The introduction of ceria in this catalyst resulted in a significant removal of Co from CoAl2O4 spinel phase to Co and COO phases. The Co K-edge revealed the symmetry changes in Co according to the temperature and atmosphere in reduction process. We also showed the stability of Co sites as well the oxidation state of ceria in operando steam reforming of ethanol (SRE) reaction. After reduction of Ce4+ to Ce3+, no significant changes were observed by XANES. Gas Chromatography (GC) analysis showed a high ethanol conversion at 500 degrees C, high hydrogen yield and low formation of undesired products as methane and ethylene. The results showed a Co/Ce/Al2O3 catalyst as promising material to be applied in hydrogen production in SRE reaction. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：104 / 109
页数：6
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