| Ir/CeO2催化剂的表征和CO氧化性能 |
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| 引用本文： | 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 |
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| 作者姓名： | 胡盼静 伍燕妮 郑海影 孟 涟 金凌云 罗孟飞 |
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| 作者单位： | 浙江师范大学物理化学研究所,浙江省固体表面反应化学重点实验室,金华321004 |
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| 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。
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| 关 键 词： | Ir/CeO2催化剂 CO氧化 转换频率(TOF) |
Ir/CeO2 Catalysts: Characterization and Performance for CO Oxidation |
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| HU Pan-Jing,WU Yan-Ni,ZHENG Hai-Ying,MENG Lian,JIN Ling-Yun and LUO Meng-Fei. Ir/CeO2 Catalysts: Characterization and Performance for CO Oxidation[J]. Chinese Journal of Inorganic Chemistry, 2011, 27(12): 2389-2394 |
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| Authors: | HU Pan-Jing WU Yan-Ni ZHENG Hai-Ying MENG Lian JIN Ling-Yun LUO Meng-Fei |
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| Affiliation: | Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, Zhejiang, China,Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, Zhejiang, China,Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, Zhejiang, China,Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, Zhejiang, China,Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, Zhejiang, China and Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, Zhejiang, China |
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| 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. |
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| Keywords: | Ir/CeO2 catalysts CO oxidation turnover frequency (TOF) |
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