期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 20, 期 27, 页码 18790-18799出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8cp02296h
关键词
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资金
- Key Program of the National Natural Science Foundation of China [21336006]
- National Key Technology RD Program [2013BAC14B04]
- National Natural Science Foundation of China [21176167]
The catalytic performances of different CuZnAl catalysts prepared using copper nitrate, copper acetate and copper citrate for CO hydrogenation to higher alcohols (C2+OH) were studied in a slurry bed reactor. Among these catalysts, the Cu-N catalyst prepared using copper nitrate showed a relatively higher C2+OH selectivity and no obvious deactivation occurred during the lifetime test for 120 h. The influence of copper precursors on the performance of the CuZnAl catalysts was investigated by XRD, Al-27-MAS-NMR, N-2 adsorption-desorption, H-2-TPR, NH3-TPD, FT-IR and XPS techniques. The results indicated that the size of Cu-0 particles, textural properties, the chemical state of Cu species, the amount of surface acid and chemical composition varied, which led to diverse catalytic activities toward C2+OH synthesis. It was concluded that Cu-0, Cu+ and AlOOH were all necessary in ethanol and C2+OH synthesis when using the CuZnAl catalysts without promoters and the synergism of these species was beneficial to the formation of C2+OH. This work further demonstrated that alkalis and Fischer-Tropsch elements were not indispensable for C2+OH synthesis from syngas.
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