催化学报

催化学报 ›› 2010, Vol. 31 ›› Issue (10): 1257-1262.DOI: 10.3724/SP.J.1088.2010.00325

• 研究论文 • 上一篇    下一篇

沉淀方法对铜基甲醇合成催化剂前驱体及其性能的影响

林胜达, 唐浩东, 吕兆坡, 刘采来, 岑亚青, 刘化章   

  1. 浙江工业大学工业催化研究所, 绿色化学合成技术国家重点实验室培育基地, 浙江杭州 310032
  • 收稿日期:2010-10-25 出版日期:2010-10-25 发布日期:2014-03-04

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

PDF

1286

被引次数

69

摘要： 分别采用共沉淀法 (CP)、两步沉淀法 (TP) 和分步沉淀法 (FP) 制备了 Cu/ZnO/Al2O3 甲醇合成催化剂. 结果发现, FP 催化剂上甲醇收率比 CP 催化剂上高 46.3%, 比 TP 催化剂上高 9.3%. 采用 X 射线衍射、微分热重分析、红外光谱、N2 吸附-脱附、程序升温还原及 N2O 滴定等方法表征了催化剂. 结果表明, FP 催化剂前驱体中 (Cu,Zn)2CO3(OH)2 和 (Zn,Cu)5(CO3)2(OH)6 两种高活性物相较多, 而 (Cu,Zn)6Al2(OH)16CO3•4H2O 物相较少, 焙烧后形成了较多的 CuO-ZnO 固溶体, 同时形成了较多的碳酸盐, 因而催化活性更高.

关键词: 甲醇合成, 沉淀方法, 铜, 氧化锌, 氧化铝, 分步沉淀, 前驱体, 碳酸盐

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