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Preparation of ceria-zeolite catalysts by different techniques and its effect on selective catalytic reduction of NO with NH3 at high space velocities

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Abstract

Several zeolite-based catalysts containing Ce3+ and/or CeO2 were prepared by a variety of catalyst preparation techniques like ion exchange, solid-state ion exchange, impregnation and physical mixing and are characterised. Selective catalytic reduction was evaluated using simulated exhaust gas containing NO x , NH3, O2 and H2O at high space velocities (>180 000 h−1) in the temperature window 150–600 °C. The activity and selectivity in NO x reduction was found to strongly depend on the charge compensating ions, crystallite size of the zeolite and CeO2 content in the catalyst. CeO2 mixed with zeolite having H+ or Ce3+ cocations showed benificial effect and increased the NO x conversion and selectivity. Among the different zeolite materials studied, the structure and the strength and amount of Brønsted acidity did not influence the NO x conversion.

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Authors and Affiliations

  1. Reactor and Catalysis Engineering, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2628 BL, Delft, The Netherlands

    K. Krishna, G. B. F. Seijger, C. M. van den Bleek, M. Makkee & H. P. A. Calis

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  1. K. Krishna
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  2. G. B. F. Seijger
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  3. C. M. van den Bleek
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  4. M. Makkee
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  5. H. P. A. Calis
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Correspondence to K. Krishna.

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Krishna, K., Seijger, G.B.F., van den Bleek, C.M. et al. Preparation of ceria-zeolite catalysts by different techniques and its effect on selective catalytic reduction of NO with NH3 at high space velocities. Topics in Catalysis 30, 115–121 (2004). https://doi.org/10.1023/B:TOCA.0000029738.41434.db

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  • DOI: https://doi.org/10.1023/B:TOCA.0000029738.41434.db

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