In situ spectroscopic studies of the effect of water on the redox cycle of Cu ions in Cu-SSZ-13 during selective catalytic reduction of NOx

Hwangho Lee; Rob Jeremiah G Nuguid; Se Won Jeon; Hyun Sub Kim; Keon Ha Hwang; Oliver Kröcher; Davide Ferri; Do Heui Kim

doi:10.1039/d2cc01786e

In situ spectroscopic studies of the effect of water on the redox cycle of Cu ions in Cu-SSZ-13 during selective catalytic reduction of NO_x

Chem Commun (Camb). 2022 Jun 8;58(46):6610-6613. doi: 10.1039/d2cc01786e.

Authors

Hwangho Lee¹, Rob Jeremiah G Nuguid^{2

3}, Se Won Jeon¹, Hyun Sub Kim¹, Keon Ha Hwang¹, Oliver Kröcher^{2

3}, Davide Ferri², Do Heui Kim¹

Affiliations

¹ School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul 08826, Republic of Korea. [email protected].
² Paul Scherrer Institut, Villigen 5232, Switzerland.
³ Institute of Chemical Science and Engineering, École polytechnique fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland.

PMID: 35583379
DOI: 10.1039/d2cc01786e

Abstract

The effect of water on the NH₃-assisted selective catalytic reduction of NO_x (NH₃-SCR) has been largely neglected, despite the inevitable presence of water vapor in real emissions produced by fuel combustion. In this work, we investigated the role of water in the behavior of active Cu²⁺ ions in Cu-SSZ-13 in the NH₃-SCR reaction. The addition of water to the reactant feed leads to significantly increased NO_x reduction over the catalyst. By combining in situ DRIFTS and XANES analyses during the NH₃-SCR reaction, we found that the redox cycle of Cu ions is promoted by the presence of water.