Au/α-Fe2O3催化剂存贮失活环境因素及机理分析

催化学报 , 2010, 31(12): 1489-1495. doi: 10.3724/SP.J.1088.2010.00618

Au/α-Fe2O3催化剂存贮失活环境因素及机理分析

尉继英 ^1, , 范桂芳 ^2, , 江锋 ^3, , 张振中 ^4, , 张兰 ^5,

1.清华大学核能与新能源技术研究院,北京,100084

2.清华大学核能与新能源技术研究院,北京,100084

3.清华大学核能与新能源技术研究院,北京,100084

4.清华大学核能与新能源技术研究院,北京,100084

5.清华大学核能与新能源技术研究院,北京,100084

基金项目: 国家自然科学基金(21077064;20777046)

关键词：金 , 三氧化二铁 , 一氧化碳 , 氧化 , 室温大气气氛 , 存贮 , 失活 , 碳酸盐

Environmental Factors and Deactivation Mechanism of Au/α-Fe2O3 Catalyst during Storage in Ambient Air

采用沉积沉淀法制备了CO低温氧化催化剂Au/α-Fe2O3,通过X射线衍射、X射线光电子能谱、N2吸附-脱附、傅里叶变换红外光谱、H2程序升温还原和CO2程序升温脱附等手段对催化剂进行了表征,探讨了在室温人气气氛下光线照射以及表面吸附等环境因素所导致的催化剂存贮失活及其作用机理.结果表明,经110℃干燥的Au/α-Fe2Os催化剂表面同时存在Au3+和Auδ+(0≤δ≤1)物种,且前者催化CO氧化的活性更高;在窒温大气气氛下,紫外线照射会引起Au3+的还原和Au颗粒的生长,导致催化剂的不可逆失活.此外,空气中的H2O和CO2可同时吸附存α-Fe2O3的表面,形成表面碳酸盐物种,会引起催化剂的可逆失活.

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Au/α-Fe2O3催化剂存贮失活环境因素及机理分析

Environmental Factors and Deactivation Mechanism of Au/α-Fe2O3 Catalyst during Storage in Ambient Air

参考文献