Study of the performance of Rh/La2O3–SiO2 and Rh/CeO2 catalysts for SR of ethanol in a conventional fixed-bed reactor and a membrane reactor
Study of the performance of Rh/La2O3–SiO2 and Rh/CeO2 catalysts for SR of ethanol in a conventional fixed-bed reactor and a membrane reactor
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DOI：
10.1016/j.ijhydene.2015.01.106
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发表时间：
2015-03
影响因子：
7.2
通讯作者：
A. M. Silva;L. Mattos;J. Múnera;E. Lombardo;F. Noronha;L. Cornaglia
中科院分区：
文献类型：
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作者：
A. M. Silva;L. Mattos;J. Múnera;E. Lombardo;F. Noronha;L. Cornaglia
在传统固定床反应器和膜反应器中研究了 Rh/La2O3-SiO2 和 Rh/CeO2 催化剂用于乙醇蒸汽重整的性能。该反应器采用自支撑 Pd-Ag 膜构建，其性能与采用相同停留时间和温度的传统反应器进行了比较。研究了蒸汽与乙醇的摩尔比、乙醇浓度、温度和接触时间对氢气渗透和氢气回收的影响。在所有情况下，乙醇转化率均保持在 100%，并且形成的产物仅为 H2、CO2、CO 和 CH4。在膜反应器中，整个乙醇重整反应有利于没有碳沉积的形成。进料中乙醇含量低（高 H2O/乙醇比）时，获得最高的渗透和氢气回收率，并且不利于甲烷形成，这与氢气的高产量一致。与 Rh/La2O3-SiO2 催化剂相比，CeO2 负载的 Rh 催化剂在较高的吹扫气流速下观察到氢气渗透/进料乙醇比率略有差异。当水/乙醇摩尔比等于 10 且膜渗透面积最大时获得最佳结果。在此条件下，氢气回收率达到约70%，每摩尔乙醇产生的氢气最高值接近2.8。
The performance of Rh/La2O3–SiO2and Rh/CeO2catalysts for steam reforming of ethanol was investigated in a conventional fixed-bed reactor and a membrane reactor. This reactor was built with a self-supported Pd–Ag membrane, and its performance was compared to that the conventional reactor employing the same residence time and temperature. The effect of steam to ethanol molar ratio, ethanol concentration, temperature and contact time over hydrogen permeation and hydrogen recovery was investigated. In all cases, the ethanol conversion was kept at 100%, and the products formed were only H2, CO2, CO and CH4. In the membrane reactor, the overall ethanol reforming reaction was favored without the formation of carbon deposits. The highest permeated and H2recovery was obtained for low ethanol content in the feed (high H2O/Ethanol ratio) and the methane formation was unfavored, in agreement with the high production of hydrogen.A slight difference in the hydrogen permeated/feed ethanol ratio was observed at higher sweep gas flow rates being higher for Rh supported on CeO2in comparison with the Rh/La2O3–SiO2catalyst. The best results were obtained with a H2O/Ethanol molar ratio equal to 10 and the highest membrane permeation area. Under these conditions, the H2recovery reached values of about 70% and the hydrogen produced for each mole of ethanol exhibited the highest value close to 2.8.