| Ag对Pd/Al2O3催化分解NO反应的促进作用 |
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| 引用本文： | 周丽萍. Ag对Pd/Al2O3催化分解NO反应的促进作用[J]. 工业催化, 2004, 12(8): 42-45 |
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| 作者姓名： | 周丽萍 |
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| 作者单位： | 大庆职业学院化工系，黑龙江 大庆 163311 |
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| 摘 要： | 研究了不同含量的银对Pd/Al2O3催化分解NO反应活性的影响。结果表明，低温下，Pd/Al2O3催化剂对NO的分解反应活性不高；反应温度达到720 ℃时，NO分解活性迅速上升。O2-TPD研究表明，Pd/Al2O3上氧的脱附速率也是在720 ℃左右达到最大值，因此，在温度低于720 ℃时，氧从催化剂表面的脱附是NO分解反应的速率控制步骤。Pd/Al2O3中添加适量的Ag对NO分解反应有促进作用。O2-TPD研究表明，这种促进作用与Pd表面氧物种的起始脱附温度向低温移动有关。
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| 关 键 词： | Pd-Ag/Al2O3催化剂 NO分解 程序升温脱附(TPD) |
| 文章编号： | 1008-1143(2004)08-0042-04 |
| 修稿时间： | 2004-03-03 |
Promotional effect of silver on NO decomposition over Pd/Al2O3 catalyst |
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| ZHOU Li-ping. Promotional effect of silver on NO decomposition over Pd/Al2O3 catalyst[J]. Industrial Catalysis, 2004, 12(8): 42-45 |
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| Authors: | ZHOU Li-ping |
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| Affiliation: | Daqing Vocational Institute, Heilongjiang Daqing 163311, China |
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| Abstract: | The promotional effect of silver on NO decomposition over Pd/Al2O3 catalyst was investigated. Pd/Al2O3 catalyst was inactive for the decomposition at low temperature, but the activity increased rapidly when reaction temperature rised to 720 ℃. O2-temperature-programmed desorption(TPD) studies showed that supported PdO decomposed to metallic palladium by desorbing oxygen around 720 ℃.Therefore, desorption of oxygen is regarded as the rate controlling step for the catalytic decomposition at temperature lower than 720 ℃. Addition of silver into Pd/Al2O3 increased its activity for the decomposition. O2-TPD studies indicated that the enhancement of activity of Pd-Ag/Al2O3 catalyst attributes to decrease in the temperature required for desorption of oxygen. |
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| Keywords: | Pd-Ag/Al_2O_3 catalyst NO decomposition O_2-temperature-programmed desorption(TPD) |
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