Production of hydrogen by ethanol steam reforming using Ni-Co-ex-hydrotalcite catalysts stabilized with tungsten oxides

被引：18
作者：
Contreras, Jose L. [1 ]
Figueroa, Anabel [1 ]
Zeifert, Beatriz [2 ]
Salmones, Jose [2 ]
Fuentes, Gustavo A. [3 ]
Vazquez, Tamara [2 ]
Angeles, Deyanira [1 ]
Nuno, Leticia [1 ]
机构：
[1] Univ Autonoma Metropolitana Azcapotzalco, CBI Energia, Mexico City 02200, DF, Mexico
[2] Inst Politecn Nacl, ESIQIE, UPALM, Mexico City 07738, DF, Mexico
[3] Univ Autonoma Metropolitana Iztapalapa, CBI IPH, Mexico City 09340, DF, Mexico
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2021年 / 46卷 / 09期
关键词：
Hydrogen; Ni-Co-Hydrotalcite-WOx; Catalysts; Ethanol; Steam-reforming;
D O I：
10.1016/j.ijhydene.2020.11.143
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Ni-Co/ex-hydrotalcite catalysts stabilized with tungsten oxides (WOx) were investigated in the ethanol steam reforming (ESR) reaction to produce H2. The catalyst with a Ni/Co atomic ratio of 2.22 turned out to be the best in conversion and selectivity to H2. This Ni-Co catalyst showed the highest number of small particles (<50 nm) compared to the mono metal catalysts of Ni and Co. NiO was completely reduced to Ni metal and Co3O4 was partially reduced to CoO and Co. Ni metal and Co-oxide particles were supported on MgO, MgAl2O4, and Al(2)O3 stabilized with WOx. The addition of small amounts of W (0.5 wt%) thermally stabilized the ex-hydrotalcite oxides and Al2O3. A cooperative action between Ni and Co is observed where partially oxidized Co prevents carbon nucleation on Ni particles. The Ni-Co, Ni and Co catalysts proved to be stable in the ESR reaction with regeneration "in situ" in cyclical operation at 600 degrees C. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：6474 / 6493
页数：20
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