| Ir/CeO2催化剂的表征和CO氧化性能 | |
| Ir/CeO2 Catalysts: Characterization and Performance for CO Oxidation | |
| 摘要: 采用浸渍法制备了Ir/CeO2催化剂，考察了催化剂的CO氧化活性。随着Ir负载量的增加，Ir/CeO2催化剂的CO氧化活性先上升后下降，当Ir的负载量为1%时，催化剂的活性最高。Ir/CeO2催化剂中Ir以IrO2的形式存在，当低负载量(≤1%)时以高分散形式存在；高负载量(＞1%)时以晶相IrO2的形式存在。随着Ir负载量增加，Ir粒子逐渐变大，反应比速率和反应转换频率(TOF)逐渐下降，表明小粒子上具有更高的CO反应活性。同时也发现金属态Ir催化剂的CO氧化活性高于氧化态IrOx催化剂。 | |
| 关键词: Ir/CeO2催化剂 CO氧化 转换频率(TOF) | |
| 基金项目: | |
| Abstract: A series of Ir/CeO2 catalysts were prepared by an impregnation method, and were tested for CO oxidation. It was found that the activity of Ir/CeO2 catalysts for CO catalytic oxidation rose first and then declined with Ir loading. The catalysts showed the highest activity when Ir content was 1%. Ir existed in the form of IrO2 in the Ir/CeO2 catalysts. IrO2 was highly dispersed with low Ir loading (≤1%), and existed as crystalline phase with high Ir loading (＞1%). Ir particle size increased gradually with Ir loading, but specific rate and turnover frequency (TOF) declined gradually. It indicated that the catalyst with small particle size had a higher CO reactivity. It was also found that for CO oxidation, the activity of Ir catalyst with metal state was higher than that with oxidation state. | |
| Keywords: Ir/CeO2 catalysts CO oxidation turnover frequency (TOF) | |
| 摘要点击次数: 1429 | |
| 全文下载次数: 1810 | |
| 胡盼静,伍燕妮,郑海影,孟 涟,金凌云,罗孟飞.Ir/CeO2催化剂的表征和CO氧化性能[J].无机化学学报,2011,27(12):2389-2394. | |
| 查看全文 查看/发表评论 下载PDF阅读器 | |
| Support information: | |
|
| |
|
| |
|
| |