A位缺陷对La-Sr-Co-O钙钛矿结构和催化氧化性能的影响

被引：0
|
作者：
高中楠 [1 ]
郭丽红 [2 ]
赵东越 [1 ]
李新刚 [1 ]
机构：
[1] 天津化学化工协同创新中心天津市应用催化科学与工程重点实验室天津大学化工学院
[2] 河南工业大学化学化工学院
来源：
高等学校化学学报 | 2021年 / 42卷 / 09期
关键词：
A位缺陷; 钙钛矿; 酸处理; 一氧化碳氧化; 一氧化氮氧化;
D O I：
暂无
中图分类号：
TQ426 [催化剂（触媒）]; X701 [废气的处理与利用];
学科分类号：
080502 ; 081705 ;
摘要：
采用柠檬酸络合法制备La-Sr-Co-O钙钛矿,通过酸处理溶解Sr离子,得到了相应的A位缺陷钙钛矿.采用X射线衍射（XRD）、X射线吸收精细结构（XAFS）、电感耦合等离子体原子发射光谱（ICP-OES）、X射线光电子能谱（XPS）和拉曼光谱（Raman）等表征技术考察了A位缺陷钙钛矿的晶体结构、配位环境及表面电子结构等性质,通过CO氧化和NO氧化活性测试评价了A位缺陷钙钛矿的催化性能.结果表明,简单酸处理有选择性地改造了Sr富集区,溶解了SrCO3以及大部分SrO.钙钛矿主体结构基本不变,局域结构中Sr（A位）的缺位造成Co离子以Co3O4形式溶出,并形成了更多的氧缺陷,有效地活化了晶格氧物种,因此其在CO氧化和NO氧化反应中均表现出更优异的低温活性.
引用
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页码：2869 / 2877
页数：9
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