Electrochemical lean-deNOx catalyst using H-conducting solid polymer electrolyte |
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| Authors: | M. Machida E. Shono M. Kimura S. Yamauchi |
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| Affiliation: | a Department of Applied Chemistry and Biochemistry, Faculty of Engineering, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan;b Transportation System Center, Mitsubishi Electric Corporation, 8-1-1 Tsukaguchi-Honnmachi, Amagasaki, Hyogo 661-8661, Japan |
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| Abstract: | The reduction of NO to N2/N2O in the presence of excess O2 has been successfully achieved at 70 °C using an electrochemical cell of the type, 0.1% NO, 0–10% O2, Pt | NAFION | Pt, H2O. An H+-conducting solid polymer electrolyte (SPE) plays a key role in evolving hydrogen on the Pt cathode, where the catalytic NO–H2 takes place. It was revealed that the competitive H2–O2 reaction is suppressed because the Pt surface was covered with stable nitrate (NO3) species, which blocks oxygen adsorption hereon. The inhibition of H2–O2 reaction becomes most efficient at  100 °C in agreement with the optimal operation temperature range of SPE. The reduction efficiency of NO in an excess O2 could be improved by packing 1 wt% Pt/ZSM-5 catalyst in the cathode room. The combination between the SPE cell and Pt catalysts can broadly be applied to novel low-temperature deNOx processes in a strongly oxidizing atmosphere. |
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| Keywords: | Electrochemical cell Solid polymer electrolyte NO– H2– O2 reaction Pt catalyst |
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