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載體孔結(jié)構(gòu)與三效催化劑起燃特性實驗研究
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國家高技術(shù)研究發(fā)展規(guī)劃(“863”計劃)(2006AA03Z462; 2008AA11A114)


Study on Relationship between Substrate Pore Structure and Emission Light-off Characteristics of Three-Way Catalysts
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    摘要:

    采用不同孔密度載體分別負(fù)載不同貴金屬含量、不同涂層涂敷量制備系列三效催化劑，通過模擬計算和發(fā)動機臺架試驗研究了具有不同孔結(jié)構(gòu)載體的催化劑性能。結(jié)果表明，提高載體孔密度可明顯改善催化劑的起燃特性和空燃比特性、有效降低催化劑中貴金屬用量、提高HCs轉(zhuǎn)化效率。起燃溫度變化取決于孔密度和貴金屬含量間的協(xié)同作用；載體孔密度變化對催化劑空燃比特性產(chǎn)生的影響更強于貴金屬含量變化；經(jīng)高溫老化后，貴金屬量仍是保持催化劑轉(zhuǎn)化效率穩(wěn)定性的重要因素

    Abstract:

    A series of three-way catalysts was prepared by different cell density substrates with different precious metal contents and washcoat loading. Light-off characteristics of the catalysts were studied by analog computation and tested on engine bench. The results indicate that high cell density of the substrate can improve the catalyst light-off characteristics and air-fuel ratio characteristics markedly, decrease precious metals content in the catalyst and enhance the capability of purifying HCs. The light-off temperature is dependent on the synergic relationship between the substrate cell density and precious metals content. The influence of substrate cell density on air-fuel ratio characteristics is stronger than that of precious metals content. For the aged catalyst, the precious metals content is still an important factor for maintaining catalytic conversion

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賀小昆,欒 浩,劉沁曦,計永波,孫加林.載體孔結(jié)構(gòu)與三效催化劑起燃特性實驗研究[J].稀有金屬材料與工程,2011,40(7):1220~1224.[He Xiaokun, Luan Hao, Liu Qinxi, Ji Yongbo, Sun Jialin. Study on Relationship between Substrate Pore Structure and Emission Light-off Characteristics of Three-Way Catalysts[J]. Rare Metal Materials and Engineering,2011,40(7):1220~1224.]
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  • 收稿日期:2010-07-18
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