2O3 密偶催化劑, 并采用H2程序升溫還原(H2-TPR), CO 化學吸附和X射線光電子能譜(XPS)對催化劑進行了表征. 在模擬尾氣條件下對催化劑的總包反應及與C3H8相關的單反應活性進行了測試. 結果表明, 老化處理后活性PdOx 數量下降, 并伴隨有金屬態(tài)Pd0的產生. 老化后, 起燃溫度(T50)和完全轉化溫度(T90) 分別提高了 76 oC和64 oC, 即催化劑低溫活性比高溫活性下降明顯. 對比新鮮和老化催化劑上單反應活性, 結果表明, 老化后無水條件下有NO參與的反應的低溫活性下降顯著. 老化處理過程突出了NO對低溫活性的抑制作用和H2O對高溫活性的促進作用."/>

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新鮮和老化Pd/Al2O3密偶催化劑上催化C3H8轉化催化性能
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四川大學化學工程學院,四川大學建筑與環(huán)境學院,四川大學化學學院,四川大學化學學院,四川大學催化材料研究所

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中圖分類號:

O643

基金項目:

國家自然科學基金 ( 21173153) ; 四川省科技支撐項目 (2014SZ0143).


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

    采用等體積浸漬法制備了以改性氧化鋁為載體材料的Pd/Al2O3 密偶催化劑, 并采用H2程序升溫還原(H2-TPR), CO 化學吸附和X射線光電子能譜(XPS)對催化劑進行了表征. 在模擬尾氣條件下對催化劑的總包反應及與C3H8相關的單反應活性進行了測試. 結果表明, 老化處理后活性PdOx 數量下降, 并伴隨有金屬態(tài)Pd0的產生. 老化后, 起燃溫度(T50)和完全轉化溫度(T90) 分別提高了 76 oC和64 oC, 即催化劑低溫活性比高溫活性下降明顯. 對比新鮮和老化催化劑上單反應活性, 結果表明, 老化后無水條件下有NO參與的反應的低溫活性下降顯著. 老化處理過程突出了NO對低溫活性的抑制作用和H2O對高溫活性的促進作用.

    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,崔亞娟,史忠華,龔茂初,陳耀強.新鮮和老化Pd/Al2O3密偶催化劑上催化C3H8轉化催化性能[J].稀有金屬材料與工程,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
  • 錄用日期:2015-06-11
  • 在線發(fā)布日期: 2017-09-27
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