燃料化学学报2018，Vol.46Issue(2)：179-188,10.
稀土掺杂改性对Cu/ZnAl水滑石衍生催化剂甲醇水蒸气重整制氢性能的影响
Effect of rare-earth element modification on the performance of Cu/ZnAl catalysts derived from hydrotalcite precursor in methanol steam reforming
摘要
Abstract
Zn-Al layered double hydroxides (ZnAl-LDHs) were prepared on γ-Al2O3 by an in-situ synthesis method;with ZnAl-LDHs as the supports,a series of rare-earth element M (M =Y,La,Ce,Sm and Gd) doped M/Cu/ZnAl catalysts were then obtained through sequential wet impregnation method and used in the methanol steam reforming to produce hydrogen.The M/Cu/ZnAl catalysts were characterized by XRD,SEM-EDS,N2 sorption,H2-TPR,XPS and N2O titration and the effect of rare-earth metal doping on their catalytic performance in the methanol steam reforming was then investigated.The results showed that the activity of Cu/ZnAl catalyst is closely related to the copper surface area and the reducibility;larger copper surface area and lower reduction temperature lead to a higher catalytic activity in methanol steam reforming.The addition of rareearth elements including Ce,Sm and Gd can improve the copper dispersion,surface copper area and the catalyst reducibility,which is helpful to enhance the activity of M/Cu/ZnAl catalysts.Especially,the Ce/Cu/ZnAl catalyst exhibits the highest activity;over it,the methanol conversion is 100％ (about 40％ higher than that over the Cu/ZnAl catalyst) and the CO concentration in the product is only 0.39 ％,for the methanol steam reforming at 250 ℃.关键词
稀土/水滑石/Cu/ZnAl/甲醇水蒸气重整/氢气/一氧化碳Key words
rare-earth/hydrotalcite/Cu/ZnAl/methanol steam reforming/hydrogen/carbon monoxide分类
化学化工引用本文复制引用
杨淑倩,贺建平,张娜,隋晓伟,张磊,杨占旭..稀土掺杂改性对Cu/ZnAl水滑石衍生催化剂甲醇水蒸气重整制氢性能的影响[J].燃料化学学报,2018,46(2):179-188,10.基金项目
The project was supported by the National Natural Science Foundation of China (21671092,21376237)and the Doctoral Scientific Research Foundation of Liaoning Province(2016013022).国家自然科学基金(21671092,21376237)和辽宁省博士科研启动基金(2016013022)资助 （21671092,21376237）
