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新鲜和老化Pd/Al2O3密偶催化剂上催化C3H8转化催化性能
作者:
作者单位:

四川大学化学工程学院,四川大学建筑与环境学院,四川大学化学学院,四川大学化学学院,四川大学催化材料研究所

中图分类号:

O643

基金项目:

国家自然科学基金 ( 21173153) ; 四川省科技支撑项目 (2014SZ0143).


Catalytic Activity of C3H8 over Fresh and Aged Pd/Al2O3 Close-Coupled Catalysts
Author:
Affiliation:

College of Chemical Engineering,Sichuan University,,,,

Fund Project:

National Natural Science Foundation of China (Grant: 21173153) and Sichuan Province Science and Technology Support Program (2014SZ0143).

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    摘要:

    采用等体积浸渍法制备了以改性氧化铝为载体材料的Pd/Al2O3 密偶催化剂, 并采用H2程序升温还原(H2-TPR), CO 化学吸附和X射线光电子能谱(XPS)对催化剂进行了表征. 在模拟尾气条件下对催化剂的总包反应及与C3H8相关的单反应活性进行了测试. 结果表明, 老化处理后活性PdOx 数量下降, 并伴随有金属态Pd0的产生. 老化后, 起燃温度(T50)和完全转化温度(T90) 分别提高了 76 oC和64 oC, 即催化剂低温活性比高温活性下降明显. 对比新鲜和老化催化剂上单反应活性, 结果表明, 老化后无水条件下有NO参与的反应的低温活性下降显著. 老化处理过程突出了NO对低温活性的抑制作用和H2O对高温活性的促进作用.

    Abstract:

    The Pd/Al2O3 close-coupled catalysts supported on modified alumina were prepared by the impregnation method, and characterized by means of H2-temperature programmed reduction (H2-TPR), CO chemisorption, and X-ray photoelectron spectroscopy (XPS). Both total catalytic activity and single reactions in related to C3H8 conversion were tested in simulated exhaust gas. The results show that the amount of active PdOx decreases and negative metallic Pd0 generates during aging treatment. The light-off temperature (T50) and complete conversion temperature (T90) increase by 76 oC and 64 oC after aging treatment, signifying that the low-temperature activity decreases more obviously than high temperature property. The results of comparison among single reactions indicate that the light-off activity of reactions which occur in atmosphere with the participation of NO but without H2O injection decrease dramatically after the aging treatment. The inhibitive effect of NO on light-off activity and the positive effect of H2O on high temperature property become obviously during the aging treatment.

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方瑞梅,崔亚娟,史忠华,龚茂初,陈耀强.新鲜和老化Pd/Al2O3密偶催化剂上催化C3H8转化催化性能[J].稀有金属材料与工程,2017,46(5):1231~1236.[FANG Rui-Mei, CUI Ya-Juan, SHI Zhong-Hua, GONG Mao-Chu, CHEN Yao-Qiang. Catalytic Activity of C3H8 over Fresh and Aged Pd/Al2O3 Close-Coupled Catalysts[J]. Rare Metal Materials and Engineering,2017,46(5):1231~1236.]
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  • 收稿日期:2015-02-05
  • 最后修改日期:2015-03-01
  • 录用日期:2015-06-11
  • 在线发布日期: 2017-09-27

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