Ir/H-ZSM-5 Catalysts in the Selective Reduction of NO x with Hydrocarbons
摘要：
Three different Ir catalysts supported on H-ZSM-5 were prepared and tested for the selective catalytic reduction of NO under net oxidizing conditions using propene as reducing agent. The preparation of highly active Ir catalysts and the elaboration of a procedure for enhancing activity by on stream conditioning was targeted. Structural changes of the catalyst during conditioning were investigated by means of XRD, TEM and activity measurements. Under reaction conditions Ir was present as Ir0 and IrO2. The presence of Ir0 was essential for high DeNOx activity. The ratio of Ir0/Ir4+ was found to depend on the size of Ir-containing crystallites. Larger crystallites contained predominantly Ir0. Crystallite size and oxidation state of Ir have been identified to be crucial for the NO reduction behaviour of Ir/H-ZSM-5.
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关键词：
HC-SCR lean DeNOx NO x reduction selective catalytic reduction of NO Ir/H-ZSM-5 propene iridium IrO2
DOI：
10.1023/A:1016663721607
被引量：
年份：
2001
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