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In relation to this article, we declare that there is no conflict of interest.
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Received July 1, 2017
Accepted September 25, 2017
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Effects of copper loading on NH3-SCR and NO oxidation over Cu impregnated CHA zeolite

1Materials Science and Chemical Engineering Department, Stony Brook University, Stony Brook, NY 11794, U.S.A., USA 2Geosciences Department, Stony Brook University, Brook, NY 11794, U.S.A., USA 3Center for Functional Laboratory, Brookhaven National Laboratory, Upton, NY 11973, U.S.A., USA
Korean Journal of Chemical Engineering, January 2018, 35(1), 89-98(10), 10.1007/s11814-017-0268-x
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Abstract

Cu/CHA catalysts with various Cu loadings (0.5 wt%-6.0 wt%) were synthesized via incipient wetness impregnation. The catalysts were applied to the selective catalytic reduction (SCR) of NO with NH3 and NO oxidation reaction. XRD and N2 adsorption-desorption data showed that CHA structure was maintained with the incorporation of Cu, while specific surface areas decreased with increasing Cu loading. At intermediate Cu loading, 4 wt%, the highest NH3-SCR activity was observed with ~98% N2 selectivity from 150 °C to 300 °C. Small amounts of water, 2%, slightly increased NO conversion in addition to the remarkable N2O and NO2 reduction at high temperature. Water effects are attributed to the improved Cu ion reducibility and mobility. NO oxidation results provided no relation between NO2 formation and SCR activity. Physicochemical properties, NO conversion, N2 selectivity, and activation energy data showed that impregnated samples’ molecular structure and catalytic activity are comparable to the conventional ion-exchanged (IE) samples’ ones.

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