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Effect of Promoter on NO Selective Catalytic Reduction over Pd/γ-Al2O3 Catalysts
Tu Jing, Fu Yilu, Lin Peiyan
Department ofChemical Physics, University ofScience and Technology ofChina, Hefei 230026
Abstract:
The effect of alkaline metal, alkaline-earth metal or rare-earth oxides doping to Pd/γ-Al2O3on the properties of palladium supported catalysts was investigated. It is confirmed that CeO2 and Li2O promoterscan improvesignificantly the activitiesof palladiumsupported catalystsfortheselective reduction of NO with propene in oxidizing atmosphere, and increase the maximum conversions of NO by afactor of 2~4.5. From XRD analysis, Pd/CeO2-Al2O3and Pd/Li2O-Al2O3have the higher Pd dispersion than theothersamples. TPDforNOand O2simultaneousadsorptionon the catalystswere detected by a mass spectrometer, and the results indicate that there are the stronger dissociation adsorption of NO on Pd/CeO2-Al2O3and Pd/Li2O-Al2O3. It is also discussed that the formation of surface adsorption species such as NO, N2O, NO2-and NO3and their desorption properties influence the activities of catalysts for NO selective reduction.
Key words:  Pd/γ-Al2O3catalyst, Promoter, NO, Selective reduction
FundProject:国家自然科学基金资助项目(29973037).
助剂对Pd/γ-Al2 O3催化剂上NO选择催化还原的影响
屠兢, 伏义路, 林培琰
中国科学技术大学化学物理系,合肥,230026
摘要:
研究了含氧条件下钯催化剂上进行丙烯选择催化还原NO的反应,考察浸渍法制备的Pd/γ-Al2O3催化剂中加入碱(土)金属或稀土氧化物助剂对NO转化率的影响,并对催化剂进行了XRD表征及在氧化气氛中饱和吸附NO后的TPD研究.结果表明,助剂CeO2、 Li2O能较大幅度提高催化剂的低温活性,使NO的最高转化率增加1~3.5倍.Pd/CeO2-Al2O3、 Pd/Li2O-Al2O3催化剂有较高的Pd分散度及较强的NO解离吸附能力.并讨论了NO、 N2O、 NO2-和NO3-等吸附态物种在催化剂表面的形成及脱附
关键词:  Pd/γ-Al2O3催化剂  助剂  一氧化氮  选择还原
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