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Influence of La Promoter in Pd/AL2O3 Catalyst on C3H8 Oxidation
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Kunming institute of precious metals

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    Abstract:

    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.

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[chenchao, wangchengxiong, yaolipeng, zhengtingting, zhaoyunkun. Influence of La Promoter in Pd/AL2O3 Catalyst on C3H8 Oxidation[J]. Rare Metal Materials and Engineering,2019,48(6):2027~2032.]
DOI:10.12442/j. issn.1002-185X.20171181

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History
  • Received:December 21,2017
  • Revised:January 08,2018
  • Adopted:February 09,2018
  • Online: July 30,2019
  • Published: