KNO_3在γ-Al_2O_3上分解及表面碱位形成的研究  

Study on Decomposition of KNO_3 on γ-Al_2O_3 and the Formation of Surface Base Sites

作　　者：李大塘[1] 屠迈[2] 沈俭一[2] 

机构地区：[1]湘潭师范学院化学系,湘潭411100 [2]南京大学化学化工学院,南京210093

出　　处：《淮海工学院学报（自然科学版）》1997年第3期51-53,共3页Journal of Huaihai Institute of Technology:Natural Sciences Edition

基　　金：国家教委跨世纪优秀人才基金;国家自然科学基金!29673021

摘　　要：用浸渍法制备KNO3／Al2O3样品。热重-差热（TG-DTA）结果显示KNO3分解经两个过程，分别对应873K和973K的吸热峰。拉曼光谱显示973K抽空的样品KNO3已完全分解成K2O。微量吸附量热结果表明973K抽空的样品碱性比纯MgO的还强。这种强碱性应为KNO3完全分解成K2O物种所致，而γ-Al2O3载体的存在可增强KNO3的分解。The KNO_3/γ-Al2O3 sample (6. 3mmol·g-1) was prepared by incipient wetness im-pregnation. Results of TG-DTA showed that the KNO3 decomposed in two stages, corresponding to the main endothermic peaks at 873K and 973K. Raman spectroscopy studies of NOx- indicated that the potassium nitrate had been completely decomposed into potassium oxides when the samplewas evacuated at 973K. In microcalorimetric rneasurement, the sample evacuated at 973K showedthe very strong basicity (initial heat of 160 KJ·mol-1), which was stronger than that of the MgO. It should be attributed to potassium oxide species obtained from potassium nitrate upon de-composition at 973K, while the existence of γ-Al2O3 support apparently promoted the decompo-sition of potassium nitrate.

关 键 词：热分解 固体碱 硝酸钾 三氧化二铝 碱位 催化剂 

分 类 号：O614.113[理学—无机化学] O643.36[理学—化学]