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A catalytic hollow fibre membrane reactor for combined steam methane reforming and water gas shift reaction

机译：一种催化中空纤维膜反应器，用于组合蒸汽甲烷重整和水煤气变换反应

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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 Al2O3 hollow 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 CO2 selectivity of 94% and a H2 recovery 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.
机译：在这项研究中开发了一种催化中空纤维膜反应器（CHFMR），用于蒸汽甲烷重整（SMR）和水煤气变换（WGS）反应的组合。这是通过将Ni / SBA-15催化剂掺入到多个微通道中而实现的，这些微通道从Al2O3中空纤维的内表面开放进入，然后使用化学方法在中空纤维的外表面涂覆3.3 µm Pd膜电镀方法。除了对每个反应器组件（即Ni / SBA-15催化剂，微结构陶瓷空心纤维和Pd隔离层）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。 Pd膜的化学镀会损害沉积的Ni / SBA-15催化剂的催化性能。同样，从反应区过量除去氢被认为是使镍基催化剂失活的主要原因。发现在较高温度下开始反应可以更有效地改善反应器性能，而不是使用“补偿”氢来减轻这种失活，这是因为氢产生（来自反应）和氢去除（来自Pd膜）之间的匹配更好。在560°C时，可获得约53％的有效甲烷转化率，94％的CO2选择性和43％的氢气回收率。为了产生更显着的“转移”现象，建议使用替代方法来制造反应器和更耐焦化的催化剂。

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