Influence of modifier (Mn, La, Ce, Zr and Y) on the performance of Cu/Zn/Al catalysts via hydrotalcite-like precursors for CO2 hydrogenation to methanol

Authors: Peng Gao, Feng Li, Ning Zhao, Fukui Xiao, Wei Wei, Liangshu Zhong, Yuhan Sun

Abstract:
A series of promoted Cu/Zn/Al catalysts derived from hydrotalcite-like precursors were synthesized by co-precipitation method and tested for the CO₂ hydrogenation to methanol. The influence of modifier (Mn, La, Ce, Zr and Y) on the physicochemical properties of Cu/Zn/Al catalysts was studied in detail. The results show that the BET specific surface area, Cu surface area and Cu dispersion increase in the order of Cu/Zn/Al < Cu/Zn/Al/Mn < Cu/Zn/Al/La < Cu/Zn/Al/Ce < Cu/Zn/Al/Zr < Cu/Zn/Al/Y. The similar trend can be observed for the total number of basic sites, while the Zr-modified Cu/Zn/Al catalyst exhibits the highest density and proportion of strongly basic sites. It is also found that the CO₂ conversion depends on the exposed Cu surface area and the CH₃OH selectivity increases linearly with the increase of proportion of strongly basic sites to the total basic sites. The introduction of Mn, La, Ce, Zr and Y favors the production of methanol and the Y- and Zr-modified Cu/Zn/Al catalysts exhibit the highest CO₂ conversion and CH₃OH selectivity, respectively.

Keywords:
Hydrotalcite-like structure
Influence of modifier
CO₂ hydrogenation
Methanol synthesis
Cu/Zn/Al catalyst

Published in: Applied catalysis A: General   (Volume 468, Pages 1-474, 5 November 2013)

Publisher: Elsevier  

ISSN Information: 0926-860X

Influence of modifier (Mn, La, Ce, Zr and Y) on the performance of Cu/Zn/Al catalysts via hydrotalcite-like precursors for CO2 hydrogenation to methanol

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