纳米NdCoO_3催化高氯酸铵热分解的DSC/TG-MS研究  

Catalytic Effect of NdCoO_3 Nanoparticles on the Thermal Decomposition of Ammonium Perchlorate by DSC/TG-MS

作　　者：余宗学[1,2] 江晓红[2] 陆路德[2] 汪信[2] 

机构地区：[1]重庆三峡学院化工系,万州404000 [2]南京理工大学软化学与功能材料教育部重点实验室,南京210094

出　　处：《无机化学学报》2009年第10期1747-1752,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.50372028);国防科技重点实验室基金(No.51455030303BQ0204)项目资助

摘　　要：采用微乳液法制备了立方晶系的NdCoO3纳米晶。利用DSC/TG-MS研究了NdCoO3对AP热分解的催化作用。结果表明,在NdCoO3的催化作用下,AP的热分解反应峰值温度下降了113℃,表观分解反应热从655 J.g-1增加到1 363 J.g-1,分解的气相产物主要有NH3,H2O,O2,HCl,N2O,NO,NO2和Cl2。在金属氧化物表面吸附生成超氧化离子(O2-)和氧离子(O-,O2-),这是加速AP分解反应的主要原因。加入NdCoO3催化AP热分解,由于对氨的氧化深度不同而导致分解放热量的增加。Cubic structural perovskite NdCoO3 nanocrystals were prepared by microemulsion method. The catalytic effect of the NdCoO3 for thermal decomposition of ammonium perchlorate （AP） was investigated by DSC and TG-MS. The results revealed that the NdCoO3 nanoparticles had effective catalysis on the thermal decomposition of AP. Adding 2% of NdCoO3 nanoparticles to AP decreased the temperature of thermal decomposition by 113 ℃ and increased the heat of decomposition from 655 J· g^-1 to 1 363 J· g^-1. Gaseous products of thermal decomposition of AP were NH3, H2O,O2, HCl, N2O, NO, NO2 and Cl2. The mechanism of catalytic action was based on the presence of superoxide ion （O2^-） and oxygenic ion （O^-, O^2-） on the surface of NdCoO3, and the difference of thermal decomposition of AP with 2% of NdCoO3 and pure AP was mainly caused by the different extent of oxidation of ammonium.

关 键 词：NdCoO3 高氯酸铵 催化 热分解 TG-MS 

分 类 号：O614.335[理学—无机化学]