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

16th International Conference on X-ray Absorption Fine Structure

Doronkin, D.E.^1,2 ; Baier, S.^1 ; Sheppard, T.^1,2 ; Benzi, F.^1 ; Grunwaldt, J.-D.^1,2

Institute for Chemical Technology and Polymer Chemistry, KIT, Kaiserstr. 12, Karlsruhe

D-76131, Germany^1

Institute of Catalysis Research and Technology, KIT, Hermann-von-Helmholtz- Platz 1, Eggenstein-Leopoldshafen

D-76344, Germany^2

关键词: Heterogeneous catalytic systems;    High temperature;    Kinetic analysis;    New european driving cycles;    Operando approaches;    Selective catalytic reduction of NOx;    Silicon microreactors;    Temperature transients;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/712/1/012030/pdf
DOI  :  10.1088/1742-6596/712/1/012030

来源: IOP

【 摘 要 】

Selective catalytic reduction of NOxby 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 N2production 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.