Ag对Pd/Al_2O_3催化分解NO反应的促进作用  

Promotional effect of silver on NO decomposition over Pd/Al_2O_3 catalyst

作　　者：周丽萍[1] 

机构地区：[1]大庆职业学院化工系,黑龙江大庆163311

出　　处：《工业催化》2004年第8期42-45,共4页Industrial Catalysis

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。The promotional effect of silver on NO decomposition over Pd/Al_2O_3 catalyst was investigated. Pd/Al_2O_3 catalyst was inactive for the decomposition at low temperature, but the activity increased rapidly when reaction temperature rised to 720 ℃. O_2-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/Al_2O_3 increased its activity for the decomposition. O_2-TPD studies indicated that the enhancement of activity of Pd-Ag/Al_2O_3 catalyst attributes to decrease in the temperature required for desorption of oxygen.

关 键 词：Pd-Ag/Al2O3催化剂 NO分解 程序升温脱附(TPD) 

分 类 号：TQ426.8[化学工程] X511[环境科学与工程—环境工程]