Citation: YANG Shu-qian, HE Jian-ping, ZHANG Na, SUI Xiao-wei, ZHANG Lei, YANG Zhan-xu. Effect of rare-earth element modification on the performance of Cu/ZnAl catalysts derived from hydrotalcite precursor in methanol steam reforming[J]. Journal of Fuel Chemistry and Technology, ;2018, 46(2): 179-188. shu

Effect of rare-earth element modification on the performance of Cu/ZnAl catalysts derived from hydrotalcite precursor in methanol steam reforming

1.
College of Chemistry, Chemical Engineering, and Environmental Engineering, Liaoning Shihua University, Fushun 113001, China
2.
Department of Chemical Engineering, Fushun Vocational Technology Institute, Fushun 113122, China

Corresponding author: ZHANG Lei, lnpuzhanglei@163.com YANG Zhan-xu, zhanxuy@126.com
Received Date: 9 August 2017
Revised Date: 13 December 2017

Fund Project: the Doctoral Scientific Research Foundation of Liaoning Province 2016013022the National Natural Science Foundation of China 21671092the National Natural Science Foundation of China 21376237The project was supported by the National Natural Science Foundation of China (21671092, 21376237) and the Doctoral Scientific Research Foundation of Liaoning Province (2016013022)

Figures(12)

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 rare-earth 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℃.
- rare-earth,
- hydrotalcite,
- Cu/ZnAl,
- methanol steam reforming,
- hydrogen,
- carbon monoxide
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