用沉积沉淀法制备负载型铜基合成低碳混合醇催化剂  

Preparation of Supported Cu Catalysts for the Synthesis of Lower Alcohols by Deposition-precipitation Method

作　　者：赵建义[1] 王大祥[1] 康慧敏[1] 李春虎[1] 赵九生[1] 

机构地区：[1]天津大学化学工程系

出　　处：《分子催化》1995年第5期347-352,共6页Journal of Molecular Catalysis(China)

基　　金：国家科委"八五"科技攻关项目;国家教委博士点基金

摘　　要：本文利用沉积沉淀法制备了几种负载型催化剂，利用ＢＥＴ比表面积测定、金属铜表面积测试、Ｘ光衍射分析、扫描电子显微镜分析和程序升温还原等实验技术进行了研究并与共沉淀法制备的催化剂进行了对比，结果表明，在同样的元素组成条件下，沉积沉淀法制备的催化剂的母体主要由Ｍ相［（Ｃｕ，Ｚｎ）２（ＯＨ）２ＣＯ３］组成，氧化态催化剂中铜和锌分布均匀，还原后催化剂中铜表面积大，将铜锌铝的盐溶液沉积沉淀到氢氧化铝载体表面上可以获得性能优良的合成低碳混合醇催化剂。在压力为５．０ＭＰａ，温度３００℃，空速３０００ｈ（－１）的反应条件下，反应产品液体醇收率达到０．３４ｇ／ｍｌ·ｈ．其中Ｃ２以上醇含量达到７９．５％。有很好的开发前景。Supported Cu-based catalysts(DP-type catalysts)for the synthesis of lower alcohols were prepared by deposition-precipitation methods. The resulted catalysts were characterized by BET surface measurement, Cu area measurement, X-ray diffraction, scanning electron microscope and temperature programmed reduction. A typical catalyst was also prepared by coprecipitation method for comparison.It was found that,with the same concentration of the components the DP-type catalysts are composed of mainly the so-called M-phase-[(Cu,Zn)2(OH)2CO3]. In these catalysts, Cu and Zn are highly dispersed. The reduced DP-type catalysts have large Cu areas. A catalyst with high activity and good thermal stability for the synthesis of lower alcohols is developed. Under the reaction conditions: p=5.0 MPa, T=300℃, and GHSV=3000 h(-1), the yield of alcohols and the selectivity to C2+ OH are 0.34 g/ml·h and 79.5%,respectively.

关 键 词：合成 低碳醇 负载型 铜基催化剂 沉积沉淀法 

分 类 号：TQ426.8[化学工程] TQ223.1