Studies on water-gas-shift enhanced by adsorption and membrane permeation
Studies on water-gas-shift enhanced by adsorption and membrane permeation
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DOI：
10.1016/j.cattod.2014.02.050
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发表时间：
2014-11
期刊：
影响因子：
5.3
通讯作者：
F. García–García;M. León;S. Ordóñez;Kang Li
中科院分区：
文献类型：
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作者：
F. García–García;M. León;S. Ordóñez;Kang Li
提出了一种新型的吸附增强膜反应器（SEMR），该反应器由填充的吸附剂-催化剂床（10%CuO/CeO 2催化剂和水滑石衍生的Mg-Al混合氧化物）和管状Pd/Ag中空纤维膜组成，用于在水煤气变换反应中获得高纯H2和同时捕获CO2。为了比较的目的，在大气压和100 °C至550 °C的操作温度下在三种不同的催化反应器中进行催化活性测试：（1）固定床反应器（FBR），（2）吸附增强反应器（SER）和（2）新的SEMR。在所有情况下，进料混合物Ar/CO/H2O比为11/1/0.75，空速为22 L/g h。FBR的性能被用作参考，以比较从SER和SEMR获得的结果。在350 °C下，SER的H2产率为80%，比传统FBR的H2产率高33%，比相应的热力学平衡高18%。然而，由于高的CO/H2O比（R> 1），在高于400 °C的温度下，不期望的副反应如C沉积变得重要。使用SEMR观察到类似的行为，然而在这种情况下，获得了高纯度的无COx H2产物。这项初步研究显示了使用SER和新的SEMR获得的相关数据，这可以更好地理解和设计多功能催化反应器。
A new sorption enhanced membrane reactor (SEMR), consisting of a packed adsorbent-catalyst bed (10% CuO/CeO2catalyst and a hydrotalcite-derived Mg–Al mixed oxide) around a tubular Pd/Ag hollow fibre membrane, has been proposed to obtain high purity H2and simultaneous capture of CO2during the water gas shift reaction. For comparison purposes, catalytic activity tests were carried out at atmospheric pressure and operating temperatures between 100 °C and 550 °C in three different catalytic reactors: (1) a fixed-bed reactor (FBR), (2) a sorption enhanced reactor (SER) and (2) a new SEMR. In all cases, the feed mixture Ar/CO/H2O ratio was 11/1/0.75 with a space velocity of 22 L/g h. The performance of the FBR was used as a reference to compare with the results obtained from the SER and SEMR. The H2yield at 350 °C using the SER was 80%, which is 33% higher than that obtained in the traditional FBR and 18% higher than the corresponding thermodynamic equilibrium. However, due to the high CO/H2O ratio (R> 1), undesirable side-reactions such as C deposition become important at temperatures higher than 400 °C. A similar behaviour was observed using the SEMR, however in this case, a high purity COxfree H2production was obtained. This preliminary study shows relevant data obtained using a SER and the new SEMR, which allows for the better understanding and design of multifunctional catalytic reactors.