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Catalysts 2018, 8(1), 3; https://doi.org/10.3390/catal8010003

Influence of the Sodium Impregnation Solvent on the Deactivation of Cu/FER-Exchanged Zeolites Dedicated to the SCR of NOx with NH3

1
CNRS, UMR 7285 Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), Université de Poitiers, 4 rue Michel Brunet—TSA 51106—86073 Poitiers CEDEX 9, France
2
Renault Trucks—Volvo Group Trucks Technology—Powertrain Engineering Lyon, 99 route de Lyon—69806 Saint-Priest CEDEX, France
*
Authors to whom correspondence should be addressed.
Received: 24 November 2017 / Revised: 18 December 2017 / Accepted: 19 December 2017 / Published: 23 December 2017
(This article belongs to the Special Issue Selective Catalytic Reduction of NOx)
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Abstract

The effect of the sodium addition mode was investigated on model Cu/FER selective catalytic reduction (SCR) catalysts with two copper loadings (2.8 wt. % and 6.1 wt. %) in order to compare samples with or without over-exchanged copper. Na was added by wet-impregnation using two solvents: water or ethanol. Catalysts were evaluated in Standard and Fast-SCR conditions, as well as in NO and NH3 oxidation. They were characterized by H2-TPR, NO and NH3 adsorption monitored by FT-IR. As expected, whatever the copper loading, ammonia adsorption capacity was decreased by Na additions. Interestingly, characterizations also showed that Na impregnation in water favors the migration of the Cu-exchanged species, leading to the formation of CuO extra-framework compounds. Consequently, for both copper loadings, Na impregnation in water led to a stronger catalyst deactivation than impregnation in ethanol. Finally, the NOx conversion at low temperature (250 °C) appeared mainly affected by the loss in NH3 adsorption capacity whereas the deNOx deactivation at high temperature (500 °C) was rather governed by the decrease in the exchanged copper ratio, which also induced a partial inhibition of NO and NH3 oxidation behaviors. View Full-Text
Keywords: NH3-SCR; sodium poisoning; copper exchanged zeolite; acidity NH3-SCR; sodium poisoning; copper exchanged zeolite; acidity
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Tarot, M.-L.; Barreau, M.; Duprez, D.; Lauga, V.; Iojoiu, E.E.; Courtois, X.; Can, F. Influence of the Sodium Impregnation Solvent on the Deactivation of Cu/FER-Exchanged Zeolites Dedicated to the SCR of NOx with NH3. Catalysts 2018, 8, 3.

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