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陈超,王成雄,姚立鹏,郑婷婷,赵云昆.La助剂对Pd-AL2O3催化C3H8氧化性能的研究[J].稀有金属材料与工程(英文),2019,48(6):2027~2032.[chenchao,wangchengxiong,yaolipeng,zhengtingting and zhaoyunkun.Influence of La Promoter in Pd/AL2O3 Catalyst on C3H8 Oxidation[J].Rare Metal Materials and Engineering,2019,48(6):2027~2032.]
Influence of La Promoter in Pd/AL2O3 Catalyst on C3H8 Oxidation
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Received:December 21, 2017  Revised:January 08, 2018
Key words: La  Pd catalyst  metal-support interaction  C3H8 oxidation
Foundation item:国家自然科学基金(21463015); 云南省应用基础研究计划项目(2014FA045,2016FD123)
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chenchao,wangchengxiong,yaolipeng,zhengtingting and zhaoyunkun  
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      Different rare earth La precursors were used to modify Pd/γ-Al2O3 catalyst via incipient wetness impregnation method. C3H8 oxidation performance was studied using powder sample evaluation device and the structures of catalysts were characterized through H2-TPR, XRD, XPS, etc. The results showed that addition of lanthanum effectively promotes palladium dispersion, strengthens Pd-support interaction and stabilizes highly-active Pd2+ species, improving the catalytic activity for C3H8 oxidation. Addition of lanthanum nitrate showed the best promoted-effect in palladium dispersion and stabilization of highly-active Pd2+ species. Compared with Pd/Al2O3, La-modified catalysts showed lower Ts, T50 and T50 values for C3H8 and NO conversion. Lanthanum addition induced changes in metal-support interaction and disperse state of active species play a significant role in enhanced activity for C3H8 catalytic oxidation.