甲醇水蒸气重整制氢Cu/ZnO/Al2O3催化剂的研究

燃料电池作为一种无污染、高效率的能源引起世界各大汽车公司的广泛关注1,2]。用于燃料电池的燃料目前研究较多的是氢气,用氢气作燃料存在储存、安全、运输等问题,寻求合适贮氢方法或替代燃料,实现车载制氢是解决问题的办法。甲醇作为液体燃料,因具有高能量密度,低碳含量,以及运输和贮存等优势成为车载制氢的理想燃料,甲醇水蒸气重整制氢反应也成为研究的热点3～10]。车载制氢对甲醇水蒸气重整制氢反应体系中的产氢速率,氢气和CO的含量都有一定的要求。尤其对CO含量要求更为苛刻,因CO易引起燃料电池阳极催化剂中毒11,12]。因此,开…

A STUDY ON Cu/ZnO/Al2O3 CATALYSTS FOR HYDROGEN PRODUCTION BY STEAM REFORMING OF METHANOL

Hydrogen production by catalytic steam reforming of methanol over a series of co precipitated Cu/ZnO/Al2O3 catalysts under atmospheric pressure in a microreactor has been studied. Effects of catalyst composition, reaction temperature and activation conditions on the catalytic activity have been investigated. Crystal phases of catalysts were analyzed by XRD. The results showed that Cu/ZnO/Al2O3 catalysts displayed high activity and selectivity for hydrogen and stability. The optimized molar ratio is Cu/Zn=1.0, a maximum methanol conversion of 99.4mol%, hydrogen selectivity of 99.9 mol% and CO molar fraction of 0.007% were obtained in the steam reforming reaction with the catalyst containing 45 mol% copper. XRD results showed that the diffraction peaks of CuO in the catalyst were clearly lower and broaden. It indicated that high dispersion of small copper crystallites on the catalyst surface was formed under the calcination conditions. It is suggested that the good performance of Cu/ZnO/Al2O3 catalysts partly resulted from well dispersed copper.