Hydrogen production by catalytic steam reforming of methanol over a series of coprecipitated Cu/ZnO/Al2O3 catalysts under atmospheric pressure in a microreactor has been studied Effects of catalyst composition...Hydrogen production by catalytic steam reforming of methanol over a series of coprecipitated 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=10, a maximum methanol conversion of 994?mol%, hydrogen selectivity of 999?mol% and CO molar fraction of 0007% 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展开更多
基金National Natural Science Foundation of China(21076206)Natural Basic Research Program of China(973 Program,2010CB732302)National High Technology Research and Development Program(863 Program,2011AA050706)
文摘Hydrogen production by catalytic steam reforming of methanol over a series of coprecipitated 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=10, a maximum methanol conversion of 994?mol%, hydrogen selectivity of 999?mol% and CO molar fraction of 0007% 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
