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Role of support in lean DeNO x catalysis

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Abstract

FTIR and pulse thermal analysis were applied to investigate catalysts containing Pt (1 wt%)/Ba (17 wt%) supported on γ−Al2O3, SiO2 and ZrO2. The aim was to learn how the support material affects the thermal stability of barium carbonate and its activity in the reaction to bulk Ba(NO3)2. The lower thermal stability of BaCO3 in alumina supported samples was found to influence the formation of barium nitrate during the NO x storage process. Quantification of Ba(NO3)2 formed during NO x storage indicated that for alumina supported catalysts only ca. 30% of barium present in the sample is involved in the storage process. The low thermal stability found for alumina supported barium nitrite excludes its role in the formation of barium nitrate during interaction of NO x with the catalyst at 300 °C. The studies indicate that γ-Al2O3 plays a major role in influencing the thermal stability of BaCO3 and Ba(NO3)2. This finding seems to be relevant for the higher activity of γ-Al2O3-supported catalysts in NO x storage reduction reactions.

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Authors and Affiliations

  1. Swiss Federal Institute of Technology, ETH-Hönggerberg, Institute for Chemical and Bioengineering, CH-8093, Zurich, Switzerland

    M. Piacentini, M. Maciejewski, T. Bürgi & A. Baiker

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  1. M. Piacentini
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  2. M. Maciejewski
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  3. T. Bürgi
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  4. A. Baiker
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Correspondence to A. Baiker.

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Piacentini, M., Maciejewski, M., Bürgi, T. et al. Role of support in lean DeNO x catalysis. Topics in Catalysis 30, 71–80 (2004). https://doi.org/10.1023/B:TOCA.0000029731.51530.f7

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  • DOI: https://doi.org/10.1023/B:TOCA.0000029731.51530.f7

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