Cu/ZnO/Al_2O_3催化剂涂层工艺参数的优化

OPTIMIZATION OF Cu/ZnO/Al_2O_3 CATALYST COATINGS

针对甲醇水蒸汽重整制氢反应,研制了一种新型的适用于微槽道反应器的Cu/ZnO/Al2O3催化剂涂层。 通过对其关键制备参数的优化,筛选出COAT-14-6(CuO 14wt．％,ZnO 6 wt．％)为性能最佳的催化剂涂层。研究 发现Cu/ZnO/Al2O3涂层催化剂的活性与活性铜的表面积和催化剂的还原性密切相关。100h的连续性实验结果表 明,涂覆了COAT-14-6的微槽道反应器可以与10W的燃料电池配套。

Cu/ZnO/Al2O3 catalyst coatings have been prepared for a micro-channel reactor,which is more suitable for the on-board production of hydrogen concerning steam reforming of methanol （SRM） for fuel cells compared to conventional systems. Several parameters that control the structural characteristics of the Cu/ZnO/Al2/O3 catalyst coatings have been optimized in an annular micro-reactor that is similar to the micro-channel reactor in flow pattern, hut is much simpler to fabricate and can be used repeatedly. It is found that catalytic activity is directly related to the copper metal surface area. The COAT-14-6 （CuO14wt. % and ZnO 6 wt.%） catalyst with the highest copper area gave the best result for SRM. A micro-channel reactor was developed by diffusion bonding and wet chemical etching. The performance of the microchannel reactor with the optimum Cu/ZnO/Al2O3 catalyst coating has also been investigated in a continuous reaction for 100h. The results show the micro-channel reactor can generate enough hydrogen for power output of 10W.