Manganese-promoted Rh/Al2O3 for C2-oxygenates synthesis from syngas -: Effect of manganese loading

被引：133
作者：
Ojeda, M
Granados, ML
Rojas, S
Terreros, P
García-García, FJ
Fierro, JLG
机构：
[1] CSIC, Inst Catalysis & Petrochem, E-28049 Madrid, Spain
[2] Stockholm Univ, Arrhenius Lab, S-10691 Stockholm, Sweden
来源：
APPLIED CATALYSIS A-GENERAL | 2004年 / 261卷 / 01期
关键词：
rhodium; manganese; CO hydrogenation; C-2; oxygenates; promoter loading effect; syngas;
D O I：
10.1016/j.apcata.2003.10.033
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 manganese promoter loading on the catalytic properties of Rh/Al2O3 catalysts (Mn/Rh = 0, 0.5, 1 and 2, atomic ratio) for the synthesis of oxygenated compounds from synthesis gas was investigated. Catalysts were characterized by means of TPR, XPS, H-2 chemisorption, FT-IR, and TPSR of chemisorbed CO. It is suggested that manganese oxide promotes CO conversion as a result of the change in the relative surface coverage of H* and C* (theta(H)/theta(C)). The manganese oxide promoter also affected the selectivity to oxygenated compounds, mainly to ethanol. The manganese promoter behaved as an electron-withdrawing, partially oxidizing the rhodium atoms at the Rh-MnO interface and thus creating new sites for CO insertion. The amount of promoter seemed to be an important parameter to achieve the highest yield of the desired reaction products. For oxygenates formation, the optimum Mn/Rh atomic ratio was found to be around 1. (C) 2003 Elsevier B.V. All rights reserved.
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页码：47 / 55
页数：9
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