University of Oulu

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

Total oxidation of dichloromethane over silica modified alumina catalysts washcoated on ceramic monoliths

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Author: El Assal, Zouhair1,2; Ojala, Satu1; Drif, Asmaa3;
Organizations: 1Faculty of Technology, Environmental and Chemical Engineering, University of Oulu, P. O. Box 4300, FI-90014 Oulu, Finland
2Thule Institute, P. O. Box 7300, FI-90014 Oulu, Finland
3Institute of Chemistry of Poitiers, Materials and Natural Resources, CNRS-UMR 7285, University of Poitiers B27, Rue Michel Brunet, CEDEX 9, 86073 Poitiers, France
4Laboratory 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
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 4.7 MB)
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Language: English
Published: Multidisciplinary Digital Publishing Institute, 2018
Publish Date: 2018-10-05


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.

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Series: Catalysts
ISSN: 2073-4344
ISSN-E: 2073-4344
ISSN-L: 2073-4344
Volume: 8
Issue: 8
Article number: 339
DOI: 10.3390/catal8080339
Type of Publication: A1 Journal article – refereed
Field of Science: 215 Chemical engineering
116 Chemical sciences
216 Materials engineering
Funding: The work was done with the financial support of PHC Volubilis (No. 24618ZJ), and Oulu University Scholarship Foundation (Yliopiston Apteekin rahasto).
Copyright information: © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (