二甲醚水蒸气重整制氢反应是燃料电池理想的供氢方式之一.探讨了二甲醚水蒸气重整过程中的反应与反应、反应与传热的耦合协同效应.采用二甲醚水解催化剂ZSM-5(硅铝比为25)和甲醇水蒸气重整催化剂(Cu-Zn系列及商用Cu-Zn-Al催化剂)混合制得二甲醚水蒸气重整的复合催化剂.在固定床反应装置中评价了催化剂活性并对催化剂进行了透射电镜、X射线衍射及N2吸附表征.结果表明,复合催化剂的活性除了受催化剂组成和铜含量的影响外,还与Al和Zr的量有关.在Cu:Zn摩尔比为60:30时,Al和Zr的同时加入使催化剂中Cu晶粒分散最好,催化剂具有较高的低温活性,二甲醚在空速为4 922 ml/(g·h)和260℃下的转化率达到72%.
Dimethyl ether (DME) steam reforming (SR) is one possible source of hydrogen for fuel cells. The synergistic effect of catalyst coupling for the DME SR process and the coupling of reaction-heat transfer was studied. A DME hydrolysis catalyst comprising ZSM-5 (Si/A; = 25) and a series of methanol steam reforming catalysts (a series of Cu-Zn-based catalysts and a commercial Cu-Zn-Al catalyst) were used for DME SR. The evaluation of catalytic activity was conducted in a fixed-bed reactor. The catalysts were characterized by scanning electron microscopy, X-ray diffraction, and N2 adsorption. The activity and selectivity were influenced by the catalyst composition and copper content, and also the content of Al and Zr. A Cu:Zn molar ratio of 60:30 together with Al and Zr gave the best dispersion of Cu crystals and the highest low-temperature catalytic activity, with a DME conversion of 72% at 260℃ and a space velocity of 4 922 ml/(g·h).
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