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16 results on '"Iojoiu, Eduard Emil"'

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

Author

Tarot, Marie-Laure, Barreau, Mathias, Duprez, Daniel, Lauga, Vincent, Iojoiu, Eduard Emil, Courtois, Xavier, and Can, Fabien

Subjects
PHYSIOLOGICAL effects of solvents, SELECTIVE catalytic oxidation, CHEMICAL synthesis, ZEOLITES
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. [ABSTRACT FROM AUTHOR]

Published
2018
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14. High-throughput approach to the catalytic combustion of diesel soot II: Screening of oxide-based catalysts

Author

Bou-Orm, Nadine, Iorgu, Andreea, Daniele, Stéphane, Bassou, Badr, Guilhaume, N., Iojoiu, Eduard Emil, Farrusseng, David, Lombaert, Karine, Bianchi, Daniel, Mirodatos, Claude, Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), SURFACES, Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université Claude Bernard Lyon 1 (UCBL), INGENIERIE (INGENIERIE), and AIR:SURFACES+DBI

Subjects
Diesel exhaust, Catalyst support, Inorganic chemistry, Oxide, chemistry.chemical_element, Catalytic combustion, 02 engineering and technology, 010402 general chemistry, Heterogeneous catalysis, medicine.disease_cause, complex mixtures, 01 natural sciences, Oxygen, Catalysis, chemistry.chemical_compound, medicine, ComputingMilieux_MISCELLANEOUS, Chemistry, General Chemistry, [CHIM.CATA]Chemical Sciences/Catalysis, 021001 nanoscience & nanotechnology, [SDE.ES]Environmental Sciences/Environmental and Society, Soot, 0104 chemical sciences, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, 0210 nano-technology
Abstract

Following the development of a high-throughput (HT) methodology for the evaluation of diesel soot oxidation catalysts in a 16 parallel channels reactor, a library of over 60 catalysts was tested under optimized conditions. The catalyst compositions were chosen to include solids which specific properties like oxygen storage capacity, oxygen mobility and ionic conductivity. The key parameters for high activity appear related to the presence of active and mobile surface oxygen species, and to an appropriate catalyst particle size in order to favour the number of contacts with the soot. In contrast, high oxygen storage capacity and bulk oxygen ion mobility do not appear as relevant properties for high catalytic activity. Nine new formulations were found to perform better than the reference catalyst “high surface area (HSA) ceria” (Rhodia).

Published
2011

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

Author

Tarot, Marie-Laure, Barreau, Mathias, Duprez, Daniel, Lauga, Vincent, Iojoiu, Eduard Emil, Courtois, Xavier, and Can, Fabien

Subjects
*PHYSIOLOGICAL effects of solvents, *SELECTIVE catalytic oxidation, *CHEMICAL synthesis, *ZEOLITES
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. [ABSTRACT FROM AUTHOR]

Published
2018
Full Text
View/download PDF

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