Hollow fibre based reactors for an enhanced H2 production by methanol steam reforming
Hollow fibre based reactors for an enhanced H2 production by methanol steam reforming
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DOI：
10.1016/j.memsci.2013.12.070
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发表时间：
2014-04
影响因子：
9.5
通讯作者：
F. García–García;S. Tsang;Kang Li
中科院分区：
文献类型：
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作者：
F. García–García;S. Tsang;Kang Li
在这项研究中，不对称的Al 2 O3中空纤维已被用来作为支撑的Cu/Zn/GaOx基催化剂或Pd/Ag膜的催化中空纤维微反应器（CHFMR）和中空纤维膜反应器（HFMR）的发展，分别。采用共沉淀法将Cu/Zn/GaOx基催化剂沉积在Al 2 O3中空纤维的指状区域内。通过X射线衍射（XRD），高分辨率光学显微镜，扫描电子显微镜（SEM）和能量分散X射线光谱（EDS），其特征在于浸渍的纤维。采用化学镀法在Al 2 O3中空纤维外表面制备了Pd/Ag膜，并通过SEM、Ar和H2渗透性对膜进行了表征。在甲醇水蒸气重整（MSR）反应过程中，将CHFMR和HFMR的性能与常规固定床反应器（FBR）的性能进行了比较。与传统的FBR相比，CHFMR提供了重要的优点，例如高催化活性沿着最大的选择性。已经观察到，在300 °C下，CHFMR中的CH 3OH转化率比常规FBR中获得的转化率大6倍，并且产生的CO比常规FBR中获得的CO小4倍。同样，在MSR期间使用HFMR获得的结果显示，在250 °C下，CH 3OH转化率为75%，这比在常规FBR中获得的高34%。此外，在250 °C和在HFMR中使用100 ml/min的吹扫气体时，Pd/Ag膜的H2回收指数为50%，这表明大量生产高纯度H2（5.5 ml/mg h）的可行性。Pd/Ag膜在反应条件下是稳定的，表现出高的H2渗透性（1.2×10− 3 mol m−2s− 1 Pa −1/2，300 °C）和渗透性（7.6×10− 9 mol m− 1 s − 1 Pa −1/2，300 °C）和对H2的无限选择性。
In this study, asymmetric Al2O3hollow fibres have been used as a support for either a Cu/Zn/GaOXbased catalyst or a Pd/Ag membrane in the development of a catalytic hollow fibre micro-reactor (CHFMR) and hollow fibre membrane reactor (HFMR), respectively. The Cu/Zn/GaOXbased catalyst was successfully deposited inside the finger-like region of the Al2O3hollow fibres by the co-precipitation technique. The impregnated fibres were characterised by X-ray diffraction (XRD), high resolution optical microscopy, scanning electron microscopy (SEM) and energy-disperse X-ray spectroscopy (EDS). The Pd/Ag membrane was deposited on the outer surface of the Al2O3hollow fibres by the electroless plating technique and was characterized by SEM, and Ar and H2permeability. The performance of both the CHFMR and HFMR was compared with that of a conventional fixed-bed reactor (FBR) during the methanol steam reforming (MSR) reaction. The CHFMR offers important advantages over conventional FBRs such as high catalytic activity along with a maximum selectivity. It has been observed that at 300 °C the CH3OH conversion in the CHFMR was 6 times larger and the CO produced 4 times smaller than that obtained in a conventional FBR. Likewise, the results obtained using the HFMR during the MSR showed that at 250 °C the CH3OH conversion was 75%, which is 34% higher than that obtained in the conventional FBR. Moreover, at 250 °C and using a sweep gas of 100 ml/min in the HFMR, the H2recovery index of the Pd/Ag membranes was 50%, which showed the feasibility of a large production of high purity H2(5.5 ml/mg h). The Pd/Ag membrane was stable under the reaction conditions, showing high H2permeance (1.2×10−3mol m−2s−1Pa−1/2at 300 °C) and permeability (7.6×10−9mol m−1s−1Pa−1/2at 300 °C) and infinite selectivity to H2.