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In a proof-of-concept study we demonstrate in situ reaction monitoring of DeNO(x)-SCR on proton-conducting zeolites serving as catalyst and gas sensor at the same time. By means of temperature-dependent impedance spectroscopy we found that the thermally induced NH(3) desorption in H-form and in Fe-loaded zeolite H-ZSM-5 follow the same process, while a remarkable difference under DeNO(x)-SCR reaction conditions was found. The Fe-loaded catalyst shows a significantly lower onset temperature, and time-dependent measurements suggest different SCR reaction mechanisms for the two catalysts tested. These results may help in the development of catalysts for the reduction of NO(x) emissions and ammonia consumption, and provide insight into the elementary catalytic process promoting a full description of the NH(3)-SCR reaction system.

Zeolites as nanoporous, gas-sensitive materials for in situ monitoring of DeNOx-SCR

Zeolites as nanoporous, gas-sensitive materials for in situ monitoring of DeNO_x-SCR