氧化物和沸石载体上负载KNO_3的分解  

THE DECOMPOSITION OF KNO\-3 OVER OXIDES AND ZEOLITES SUPPORTS

作　　者：沈彬[1] 淳远[1] 朱建华[1] 夏加荣[1] 王英[1] 须沁华[1] 

机构地区：[1]南京大学化学化工学院

出　　处：《无机化学学报》1999年第3期351-356,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家八六三计划新材料领域;国家自然科学基金;教育部留学人员基金

摘　　要：本文报道采用程序升温分解－比色（ＴＰＤＥ－ＣＭ）的新方法研究了ＫＮＯ３在Ａｌ２Ｏ３、ＴｉＯ２、ＳｉＯ２等氧化物和ＮａＹ、ＫＹ、Ｋβ等沸石及ＭＣＭ－４１中孔分子筛上的分解，首次发现负载的ＫＮＯ３由于受到载体表面的作用而能在４００～５００Ｋ开始分解；而分散在Ａｌ２Ｏ３上的ＫＮＯ３甚至于在室温下就可被部分分解。novel method, named as temperature prpgrammed decomposition colorimetric method (TPDECM), was employed to explore the special decomposition of KNO\-3 at low temperature on inorganic porous materials such as alumina, titania and silica along with NaY, KY, K\%\% zeolites as well as MCM41 mesoporous molecular sieve. Many factors such as surface acidity, octahedral vacant site in the structure of support, geometricchemical microenvironment provided by the inorganic porous materials, along with their influences on the decomposition of KNO\-3 at low temperature were examined. It was firstly revealed that KNO\-3 began to decompose in the range of 400￣500 K upon loaded on these inorganic supports resulting from a special interaction between KNO\-3 and the surface of porous materials. Moreover, some of the KNO\-3 loaded on alumina had been decomposed even at room temperature during the preparation process, which would be an important factor affecting the resulting strong basicity and/or superbasicity of KNO\-3/Al\-2O\-3 catalysts, although a further investigation is needed to explore the reason. Based on the results reported in this paper, TPDECM method is proven to be a powerful novel technique with a high sensitivity for the investigation on the new solid strong bases or superbases derived from KNO\-3 supported on porous materials.\;\;

关 键 词：硝酸钾 负载 固体超强碱 择形碱催化 择形催化剂 

分 类 号：O643.36[理学—物理化学]