沉淀方法对铜基甲醇合成催化剂前驱体及其性能的影响  

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

作　　者：林胜达[1] 唐浩东[1] 吕兆坡[1] 刘采来[1] 岑亚青[1] 刘化章[1] 

机构地区：[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

出　　处：《催化学报》2010年第10期1257-1262,共6页

基　　金：浙江省科技厅重点项目(2006C21075)

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.Cu/ZnO/Al2O3 catalyst samples for methanol synthesis were prepared by coprecipitation （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.

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 

分 类 号：TQ223.121[化学工程—有机化工]