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首页> 外文期刊>Fuel >An optimized highly active and thermo-stable oxidation catalyst Pd/Ce-Zr-Y/Al_2O_3 calcined at superhigh temperature and used for C_3H_8 total oxidation
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An optimized highly active and thermo-stable oxidation catalyst Pd/Ce-Zr-Y/Al_2O_3 calcined at superhigh temperature and used for C_3H_8 total oxidation

机译：一种优化的高活性，热稳定的氧化催化剂Pd / Ce-Zr-Y / Al_2O_3，在超高温下煅烧，用于C_3H_8的总氧化

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摘要

A series of supported catalysts Pd/Ce-Zr-Y/Al_2O_3 with different Y loadings (0%, 2%, 5%, 10% by weight) were prepared by ultrasonic-assisted impregnation, and employed for C_3H_8 total oxidation. It is found that these catalysts possess high catalytic activity and high thermal stability even after calcination at 1100 ℃, especially for the one promoted by 5% Y. In addition, this catalyst also exhibits best water-vapor resistance performance. The results of H_2-TPR and XPS show that the addition of proper amount of Y to Pd/Ce-Zr/Al_2O_3 can enhance the interaction between Pd species and the support, thus increasing the dispersion of Pd species. The TEM, TPHD and CO pulse chemisorption results conformably reveal that the catalyst Pd/Ce-Zr-Y/Al_2O_3 containing 5% Y possesses the highest Pd dispersion as compared with others. However, excessive amounts of Y lead to remarkable decrease of BET surface area, lowering the dispersion of Pd species and weakening the interaction between Pd species and support; as a result, the catalyst exhibits lower oxidation activity. Combined with all the results of catalytic oxidation performance, water-vapor resistance performance and multiple characterizations, it is concluded that the Pd/ Ce-Zr-Y/Al_2O_3 catalyst containing 5% Y possesses the greatest application potential for the catalytic removal of hydrocarbon pollutants released by engines during cold-start period.
机译：通过超声辅助浸渍制备了一系列Y负载量分别为0％，2％，5％，10％（重量）的负载型催化剂Pd / Ce-Zr-Y / Al_2O_3，并用于C_3H_8的全氧化。发现这些催化剂甚至在1100℃煅烧后也具有高催化活性和高热稳定性，特别是对于由5％Y促进的催化剂。此外，该催化剂还表现出最佳的耐水蒸气性能。 H_2-TPR和XPS的结果表明，向Pd / Ce-Zr / Al_2O_3中添加适量的Y可以增强Pd物种与载体之间的相互作用，从而增加Pd物种的分散性。 TEM，TPHD和CO脉冲化学吸附结果一致地表明，含5％Y的催化剂Pd / Ce-Zr-Y / Al_2O_3具有最高的Pd分散性。然而，过量的Y导致BET表面积的显着减小，降低了Pd物质的分散性并削弱了Pd物质与载体之间的相互作用。结果，该催化剂表现出较低的氧化活性。结合催化氧化性能，耐水蒸气性能和多种表征的所有结果，得出结论：含5％Y的Pd / Ce-Zr-Y / Al_2O_3催化剂具有最大的去除烃类污染物的应用潜力。在冷启动期间由发动机释放。

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  • 来源
    《Fuel》 |2013年第1期|799-804|共6页
  • 作者

    Gang Wang; Rui You; Ming Meng;

  • 作者单位

    Tianjin Key Laboratory of Applied Catalysis Science and Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China;

    Tianjin Key Laboratory of Applied Catalysis Science and Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China;

    Tianjin Key Laboratory of Applied Catalysis Science and Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Pd/Ce-Zr-Y/Al_2O_3; propane oxidation; thermal stability; Pd dispersion; water-vapor resistance;

    机译：Pd / Ce-Zr-Y / Al_2O_3;丙烷氧化热稳定性;钯分散耐水蒸气性;

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