摘要
以共沉淀法制备的碳酸根型Cu-A l类水滑石为前体,经500℃焙烧得到Cu-A l复合氧化物。采用X射线衍射、傅里叶变换红外光谱等表征手段研究了Cu-A l复合氧化物氧化吸附NO2的规律和机理。实验结果表明,NO2、O2和水蒸气吸附到Cu-A l复合氧化物的表面上后反应生成HNO3,然后Cu-A l复合氧化物中的CuO与HNO3反应生成Cu(NO3)2。上述试样放置15 d后可以恢复成原来的层状结构,得到硝酸根型Cu-A l类水滑石。在无水蒸气存在的情况下,Cu-A l复合氧化物对NO2只发生物理吸附,没有其它新物质生成。
The oxidative adsorption of nitrogen dioxide on Cu - Al mixed oxides was studied. The mixed oxides were obtained by calcinations of Cu - Al hydrotalcite - like compounds （ CuAl - CO3 - LDHs） at about 500 ℃. The mechanism of NO2 oxidative adsorption was investigated by means of XRD and FTIR. NO2,O2 and water vapor were adsorbed on surface of Cu - Al mixed oxides, and reacted with each other to form HNO3, and HNO3 successively reacted with Cu -Al mixed oxides to form Cu（ NO3 ）2. After placing the obtained samples in dryer for 15 d, the layered structure was reconstructed due to“memory effect” of calcined hydrotalcites, and formed CuAl - NO3 - LDHs. However, in absence of water vapor in the experiment, NO2 could be only physically adsorbed on Cu - Al mixed oxides, and no new species produced.
出处
《石油化工》
EI
CAS
CSCD
北大核心
2005年第12期1203-1207,共5页
Petrochemical Technology
基金
哈尔滨工程大学基础研究基金项目(HEUF04065)
关键词
类水滑石
复合金属氧化物
氧化吸附
氮氧化物
hydrotalcite - like compounds
metal mixed oxides
oxidative adsorption
oxides of nitrogen
