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Catalysts 2018, 8(8), 339; https://doi.org/10.3390/catal8080339

Total Oxidation of Dichloromethane over Silica Modified Alumina Catalysts Washcoated on Ceramic Monoliths

1
Faculty of Technology, Environmental and Chemical Engineering, University of Oulu, P. O. Box 4300, FI-90014 Oulu, Finland
2
Thule Institute, P. O. Box 7300, FI-90014 Oulu, Finland
3
Institute of Chemistry of Poitiers, Materials and Natural Resources, CNRS-UMR 7285, University of Poitiers B27, Rue Michel Brunet, CEDEX 9, 86073 Poitiers, France
4
Laboratory of Catalysis and Corrosion of Materials (LCCM), Department of Chemistry, Faculty of Sciences, University of Chouaïb Doukkali El Jadida, BP 20, 24000 El Jadida, Morocco
*
Author to whom correspondence should be addressed.
Received: 8 July 2018 / Revised: 8 August 2018 / Accepted: 17 August 2018 / Published: 20 August 2018
(This article belongs to the Special Issue Catalysts for Oxidative Destruction of Volatile Organic Compounds)
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Abstract

Silica modified alumina was used in this study for coating of a cordierite monolith substrate with two different channel densities. The performance of the prepared monolith catalysts was evaluated in catalytic total oxidation of dichloromethane before and after Pt impregnation. The characteristics similar to the powder form catalysts were kept rather successfully after washcoating the monolith as evidenced by electron microscopy (FESEM) and N2 physisorption. A dichloromethane (DCM) conversion of higher than 80% at 500 °C was reached over all the catalysts with 200 cpsi. The maximum conversion was obtained with the catalyst containing 10 mol % of silica. The total amount of major byproducts (CO, CH3Cl and CH2O) were slightly decreased by increasing the silica loading, and remarkably after Pt impregnation. After impregnation of Pt, the HCl yields were increased for two samples with the higher loading of silica (10 and 15 mol %) and reached the maximum when silica loading was 10%. Even though Pt impregnation did not significantly affect the DCM conversion, it improved the selectivity. Comparison between the two substrates (200 and 600 cpsi) evidenced that the key parameters of the monolith influencing the DCM oxidation are low value of open fraction area, hydraulic diameter, thermal integrity factor and high value of mechanical integrity factor and geometric surface area. View Full-Text
Keywords: alumina-silica oxide; cordierite; CVOC abatement; dichloromethane; sol-gel method alumina-silica oxide; cordierite; CVOC abatement; dichloromethane; sol-gel method
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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El Assal, Z.; Ojala, S.; Drif, A.; Zbair, M.; Bensitel, M.; Pirault-Roy, L.; Nevanperä, T.; Pitkäaho, S.; L. Keiski, R.; Brahmi, R. Total Oxidation of Dichloromethane over Silica Modified Alumina Catalysts Washcoated on Ceramic Monoliths. Catalysts 2018, 8, 339.

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