Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 25, Issue 2-3, Pages 191-203Publisher
ELSEVIER
DOI: 10.1016/S0926-3373(99)00131-9
Keywords
NOx; N2O; dual-bed system; Pt/activated carbon; calcined hydrotalcite; ex-Co-Rh; Al-HTlc; ex-Co; Pd-La; Al-HTlc; Fe-ZSM-5; Pd-ZSM-5; propene
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A dual-bed catalytic system has been developed by which NOx and N2O are successively removed from flue gases, simulating lean-burn engine conditions. NOx is removed in the first stage by selective catalytic reduction with propene over a Pt supported on activated carbon catalyst. The second bed decomposes the N2O formed in the first bed into N-2 and O-2 Catalysts tested in this second stage comprise ex-Go-Rh,Al-HTlc and ex-Co,Pd-La,Al-HTlc mixed oxides derived from hydrotalcite-like compounds and ion-exchanged Fe-ZSM-5 and Pd -ZSM-5 zeolites. Variables studied for the most promising deN(2)O catalysts are the effect of the pretreatment, the sodium content of the ex-HTlc-catalysts, the presence of inhibitors in the feed stream, the addition of hydrocarbons to enhance the N2O reduction in the second bed, and both time-on-stream and thermal stability of the catalytic system. Ex-Co-Rh,Al-HTlc proved to be the most active and stable catalyst, followed by Fe-ZSM-5, even when propene was added as reducing agent, which enhanced the conversion over the latter catalyst only. In an optimal configuration, at a temperature of 475 and 700 K in the first and second stage, respectively, molar conversions of 90 and 100% for NOx and N2O were achieved in a stable operation during 50 h. (C) 2000 Elsevier Science B.V. All rights reserved.
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