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Tracking mobile active sites and intermediates in NH3-SCR over zeolite catalysts by impedance-based in situ spectroscopy

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Abstract

Integrated investigations combining experimental and theoretical methods have promoted significantly the fundamental understanding of zeolite-based ammonia selective catalytic reduction (NH3-SCR), a key technology for the abatement of automotive nitrogen oxide emissions. One representative finding is that site-isolated Cu ions within zeolite catalysts are solvated and mobilized in the NH3-SCR reaction at low temperatures. In this minireview, we highlight that impedance-based in situ spectroscopy (in situ IS), by monitoring the dielectric properties of zeolite catalysts, can be used to track directly the dynamic Cu ion motion under NH3-SCR reaction conditions. Further combining in situ IS with diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) allows us to monitor the dynamics of other mobile species involved in NH3-SCR catalysis, for example ammonium ion (NH4+) intermediates resulting from the redox of metal active sites.

Graphical abstract: Tracking mobile active sites and intermediates in NH3-SCR over zeolite catalysts by impedance-based in situ spectroscopy

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Publication details

The article was received on 01 Nov 2018, accepted on 18 Dec 2018 and first published on 18 Dec 2018


Article type: Minireview
DOI: 10.1039/C8RE00283E
Citation: React. Chem. Eng., 2019, Advance Article
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    Tracking mobile active sites and intermediates in NH3-SCR over zeolite catalysts by impedance-based in situ spectroscopy

    P. Chen, V. Rizzotto, K. Xie and U. Simon, React. Chem. Eng., 2019, Advance Article , DOI: 10.1039/C8RE00283E

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