Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2010, Vol. 31 ›› Issue (10): 1257-1262.DOI: 10.3724/SP.J.1088.2010.00325

• Research papers • Previous Articles     Next Articles

Influence of Precipitation Methods on Precursors and Properties of Cu-Based Catalyst for Methanol Synthesis

LIN Shengda, TANG Haodong, LÜ Zhaobo, LIU Cailai, CEN Yaqing, LIU Huazhang*   

  1. State Key Laboratory of Green Chemistry-Synthesis Technology, Institute of Industrial Catalysts, Zhejiang University of Technology, Hangzhou 310032, Zhejiang, China
  • Received:2010-10-25 Online:2010-10-25 Published:2014-03-04

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Abstract: Cu/ZnO/Al2O3 catalyst samples for methanol synthesis were prepared by co-precipitation (CP), two-stage precipitation (TP), and fractional precipitation (FP) methods, respectively. The evaluation results showed that the methanol yields over the catalyst prepared by FP is the best, which is 46.3% higher than that over the catalyst prepared by CP and 9.3% higher than that over the catalyst prepared by TP. The catalyst samples and their precursors were characterized by X-ray diffraction, thermogravimetry, infrared spectroscopy, N2 adsorption-desorption, temperature-programmed reduction, and N2O titration. The results revealed that the precursor prepared by FP has higher amounts of (Cu,Zn)2CO3(OH)2 and (Zn,Cu)5(CO3)2(OH)6 phases and a lower amount of the (Cu,Zn)6Al2(OH)16 CO3•4H2O phase. Therefore, after calcination the catalyst has a higher amount of CuO-ZnO solid solution and carbonate formed at high temperature.

Key words: methanol synthesis, precipitation method, copper, zinc oxide, alumina, fractional precipitation, precursor, carbonate