硫促进改性MgAl水滑石催化剂的制备及Aldol缩合反应性能  

Preparation of sulphur-modified Mg-Al hydrotalcite and catalytic performance to the Aldol condensation reaction

作　　者：胡曦 梁金花[1] 张锋[1] 王俊格[1] 任晓乾[1] 

机构地区：[1]南京工业大学化学化工学院,南京210009

出　　处：《中国科学：化学》2015年第2期194-201,共8页SCIENTIA SINICA Chimica

基　　金：国家重点基础研究发展计划(2009CB724701);江苏高校优势学科建设工程资助项目(PAPD)资助

摘　　要：利用镁铝水滑石的记忆效应,以过硫酸铵为改性剂,经过浸渍焙烧复原过程,制得一系列硫促改性镁铝水滑石催化剂.利用XRD,BET,SEM和FT-IR等手段对催化剂的物理化学性质进行了表征.结果显示,改性后催化剂仍保有原水滑石层状晶体结构,催化剂表面具有碱中心与酸中心.随着硫含量增加,催化剂碱中心逐渐减少,酸中心增加,酸性增强.以对硝基苯甲醛与丙酮的羟醛缩合为探针反应,考察了催化剂的催化性能.A series of sulphur-modified hydrotalcites catalysts was prepared by the way of calcination method, dipping method and reconstructed method. Catalysts were characterized by XRD, BET, SEM and IR technology. The results of characterization indicated that catalysts still remained layer structure. At the same time, acid sites and base sites were observed on it. The strength and content of acid sites of the catalyst increased, while the content of base sites decreased obviously with the increase of sulfur loading. The Aldol condensation of p-nitrobenzaldehyde and acetone was selected as probe reaction to investigate the catalytic performance of catalysts.

关 键 词：水滑石 过硫酸铵 酸碱双功能 ALDOL反应 

分 类 号：O643.36[理学—物理化学]