A catalytic hollow fibre membrane reactor for combined steam methane reforming and water gas shift reaction
A catalytic hollow fibre membrane reactor for combined steam methane reforming and water gas shift reaction
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DOI：
10.1016/j.ces.2015.06.051
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发表时间：
2015-12
影响因子：
4.7
通讯作者：
A. Gil;Zhentao Wu;D. Chadwick;Kang Li
中科院分区：
文献类型：
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作者：
A. Gil;Zhentao Wu;D. Chadwick;Kang Li
研究了一种用于蒸汽甲烷重整（SMR）和水煤气变换（WGS）联合反应的中空纤维膜催化反应器（CHFMR）。这是通过将Ni/SBA-15催化剂从al2o3中空纤维的内表面加入到多个开放入口的微通道中，然后使用化学镀方法在中空纤维的外表面涂上3.3 μ m的Pd膜来实现的。除了对Ni/SBA-15催化剂、微结构陶瓷中空纤维和Pd分离层等反应器各组分进行系统表征外，还评估了反应器的组装或制造方式对催化性能的影响。化学镀Pd膜会影响Ni/SBA-15催化剂的催化性能。反应区氢的过度脱氢被认为是镍基催化剂失活的主要原因。与使用“补偿”氢来减轻这种失活相比，在更高的温度下开始反应可以更有效地改善反应器的性能，因为在反应中产生的氢和从Pd膜中去除的氢之间更好地匹配。在560℃条件下，甲烷转化率约为53%，二氧化碳选择性为94%，h2回收率为43%。为了产生更显著的“转移”现象，推荐了制造反应器和更耐焦炭催化剂的替代方法。
A catalytic hollow fibre membrane reactor (CHFMR) was developed in this study for combined steam methane reforming (SMR) and water gas shift (WGS) reaction. This is achieved by incorporating a Ni/SBA-15 catalyst into a plurality of micro-channels with open entrance from inner surface of Al2O3hollow fibres, followed by coating of a 3.3 µm Pd membrane on the outer surface of the hollow fibre using an electroless plating method. In addition to systematic characterizations of each reactor component, i.e. Ni/SBA-15 catalyst, micro-structured ceramic hollow fibre and Pd separating layer, the effect of how the reactor was assembled or fabricated on the catalytic performance was evaluated. Electroless plating of the Pd membrane impaired the catalytic performance of the deposited Ni/SBA-15 catalyst. Also, the over-removal of hydrogen from the reaction zone was considered as the main reason for the deactivation of the Ni-based catalyst. Instead of mitigating such deactivation using “compensating” hydrogen, starting the reaction at higher temperatures was found more efficient in improving the reactor performance, due to a better match between hydrogen production (from the reaction) and hydrogen removal (from the Pd membrane). An effective methane conversion of approximately 53%, a CO2selectivity of 94% and a H2recovery of 43% can be achieved at 560 °C. In order for a more significant “shift” phenomenon, alternative methodology of fabricating the reactor and more coke resistant catalysts are recommended.