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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Authors: | K Krishna GBF Seijger CM van den Bleek M Makkee and HPA Calis |
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Affiliation: | (1) Reactor and Catalysis Engineering, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands |
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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 (>180000 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+ co-cations 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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Keywords: | selective catalytic reduction SCR NO
x
NH3 CeO2 Ce3+ ZSM-5 FER BEA MOR ion exchange impregnation solid-state ion exchange physical mixing |
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