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Selective catalytic reduction of NOx by ammonia over Cu-ZSM-5 was monitored by operando QEXAFS during simulation of the New European Driving Cycle. The required fast temperature transients were realized using a novel silicon microreactor, enabling simultaneous spectroscopic and kinetic analysis by X-ray absorption spectroscopy (XAS) and mass spectrometry (MS). Periods of high temperature were correlated to an increase in both N2 production and change of coordination of Cu sites. This operando approach using Si microreactors can be applied to other heterogeneous catalytic systems involving fast temperature transients.

journal of physics. conference series

Lithographically fabricated silicon microreactor for<i>operando</i>QEXAFS studies in exhaust gas catalysis during simulation of a standard driving cycle

Lithographically fabricated silicon microreactor foroperandoQEXAFS studies in exhaust gas catalysis during simulation of a standard driving cycle