WANG Dunjun^1,2, TAO Furong^1,2, ZHAO Huahua^1,2, SONG Huanling¹, CHOU Lingjun^1*

(1 State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, P. R. China. 2 Graduate School of Chinese Academy of Sciences, Beijing 100049, P. R. China.)

Abstract: Cu/ZnO/Al₂O₃ catalyst was prepared by coprecipition-amonia evaporation (CAE) method using ammonium carbonate as precipitating agent. The reference catalysts were prepared by conventional coprecipitation using ammonium carbonate (CCA) and sodium carbonate (CCS) as precipitating agents. XRD, BET, TPR and N₂O titration technology were employed to investigate the structure and surface performance of the catalysts. The CAE-derived catalyst showed relatively smaller particle size and higher specific Cu (0) surface area. The CCA-derived catalyst displayed the highest total surface area, but the specific Cu (0) surface area was relatively lower. The residual Na⁺ was more difficult to be removed than NH⁴⁺, and facilely led to the agglomeration of Cu resulting in the lower specific Cu(0) surface area. The catalytic performance of CAE catalyst was better than others, resulting from the higher specific Cu(0) surface area.

Key words: Methanol synthesis; Hydrogen of carbon dioxide; Coprecipitation-ammonia evaporation; Cu/ZnO/Al₂O₃ catalyst

E-mail: ljchou@licp.cas.cn

Journal of Molecular Catalysis, Vol. 25, Issue 2, 2011, 124~129