期刊
JOURNAL OF CO2 UTILIZATION
卷 11, 期 -, 页码 41-48出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2014.12.008
关键词
Cu/Zn/Al/Zr catalyst; Hydrotalcite-like compounds; Al content; CO2 hydrogenation; Methanol synthesis
资金
- National Key Technology Research and Development Program of the Ministry of Science and Technology of China [2013BAC11B02]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA02040602]
- Shanghai Municipal Science and Technology Commission, China [15ZR1444500]
Cu/Zn/Al/Zr catalysts with Cu2+:Zn2+:Al3+:Zr4+ = 2:1:x:0.1 (x= 0.6-1.5) were prepared from hydrotalcite-like precursors by co-precipitation method and tested for the CO2 hydrogenation to methanol. Both Cu/Zn/Al/Zr hydrotalcite-like and malachite phase were formed at low Al content. However, with the increase of Al content, the yield of hydrotalcite-like phase increased and phase-pure Cu/Zn/Al/Zr hydrotalcite-like compound was obtained for x >= 0.9. In addition, both the specific surface area and the dispersion of Cu increased gradually with the increase of Al, while the exposed Cu surface area first increased until Al content was 27.9 mol%, then decreased. The results of catalytic test for CO2 hydrogenation revealed that Cu/Zn/Al/Zr catalysts via phase-pure hydrotalcite-like compounds exhibited much better catalytic performance with higher CO2 conversion and CH3OH selectivity compared with the catalyst derived from mixed phase (hydrotalcite-like and malachite). The Cu/Zn/Al/Zr catalysts with Cu2+:Zn2+:Al3+:Zr4+ = 2:1:1.2:0.1 resulting from phase-pure hydrotalcite-like precursors afforded the substantial stability and the best catalytic performance. (C) 2015 Elsevier Ltd. All rights reserved.
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