Effects of Support and Rh Additive on Co-Based Catalysts in the Ethanol Steam Reforming Reaction

被引:136
作者
Ferencz, Zs. [1 ]
Erdohelyi, A. [1 ]
Baan, K. [1 ]
Oszko, A. [1 ]
Ovari, L. [2 ]
Konya, Z. [2 ,3 ]
Papp, C. [4 ]
Steinrueck, H. -P. [4 ]
Kiss, J. [1 ,2 ]
机构
[1] Univ Szeged, Dept Phys Chem & Mat Sci, H-6720 Szeged, Hungary
[2] MTA SZTE React Kinet & Surface Chem Res Grp, H-6720 Szeged, Hungary
[3] Univ Szeged, Dept Appl & Environm Chem, H-6720 Szeged, Hungary
[4] Univ Erlangen Nurnberg, D-91058 Erlangen, Germany
来源
ACS CATALYSIS | 2014年 / 4卷 / 04期
关键词
ethanol steam reforming; hydrogen production; cobalt-ceria catalyst; rhodium promoter; ethoxide; DRIFTS; XPS; FISCHER-TROPSCH SYNTHESIS; TEMPERATURE-PROGRAMMED DESORPTION; COBALT-BASED CATALYSTS; NOBLE-METAL CATALYSTS; CARBON-CARBON BOND; SITU FT-IR; HYDROGEN-PRODUCTION; PARTICLE-SIZE; SPECTROSCOPIC CHARACTERIZATION; ACETALDEHYDE ADSORPTION;
D O I
10.1021/cs500045z
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
The effect of the nature of the support and the promotion achieved by a Rh additive on Co-based catalysts in the ethanol steam reforming reaction were studied. The catalysts with 2% Co loading were characterized by temperature-programmed reduction (TPR) and X-ray photoelectron spectroscopy (XPS). In situ diffuse reflectance Fourier-transform infrared spectroscopy (DRIFTS) identified the surface intermediates formed during the reaction, whereas gas phase products were detected by gas chromatography (GC). Upon heating in hydrogen to 773 K, cobalt could not be reduced to Co-0 on alumina, but on silica the reduction was almost complete. On ceria, half of the Co could be reduced to the metallic state. By the presence of a small amount (0.1%) of Rh promoter, the reduction of both cobalt and ceria was greatly enhanced. For Co on the acidic Al2O3 support, the dehydration mechanism was dominant, although on the basic CeO2 support, a significant amount of hydrogen was also formed. Addition of a small amount of Rh as promoter to the Co/CeO2 catalyst resulted in a significant further increase in the hydrogen selectivity.
引用
收藏
页码:1205 / 1218
页数:14
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