University of Oulu

Zouhair El Assal, Satu Ojala, Mohamed Zbair, Hafid Echchtouki, Tuomas Nevanperä, Satu Pitkäaho, Laurence Pirault-Roy, Mohammed Bensitel, Rachid Brahmi, Riitta L. Keiski, Catalytic abatement of dichloromethane over transition metal oxide catalysts: Thermodynamic modelling and experimental studies, Journal of Cleaner Production, Volume 228, 2019, Pages 814-823, ISSN 0959-6526, https://doi.org/10.1016/j.jclepro.2019.04.073

Catalytic abatement of dichloromethane over transition metal oxide catalysts : thermodynamic modelling and experimental studies

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Author: El Assal, Zouhair1,2; Ojala, Satu1; Zbair, Mohamed1,3;
Organizations: 1University of Oulu, Faculty of Technology, Environmental and Chemical Engineering (ECE), P.O. Box 4300, FI-90014, University of Oulu, Finland
2Thule Institute P.O. Box 7300, FI-90014, University of Oulu, Finland
3University of Chouaïb Doukkali El Jadida, Faculty of Sciences, Laboratory of Catalysis and Corrosion of Materials (LCCM), Department of Chemistry, BP.20, 24000, El Jadida, Morocco
4Laboratory of Applied Chemistry and Environment, Faculty of Science and Technology Hassan 1st University, Settat, Morocco
5Institut de Chimie des milieux et des matériaux de Poitiers (IC2MP), Université de Poitiers, UMR 7285 CNRS, 4, Rue Michel Brunet, 86073, Poitiers Cedex 9, France
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2019080923824
Language: English
Published: Elsevier, 2019
Publish Date: 2021-04-19
Description:

Abstract

Dichloromethane (DCM) is a noxious chemical that is widely used in industry. The current work focuses on the catalytic abatement of DCM from industrial effluents to minimize its harmful effects to the environment and human wellbeing. Three transition metal oxide catalysts (V, Cu and Mn) supported on γ-Al₂O₃ were synthetized for total oxidation of DCM in presence of steam. Thermodynamic modelling was used to reveal information related to the stability of the used transition metal oxides in the abatement conditions. The results showed that with 10 wt-% CuO and 10 wt-% V₂O₅ containing catalysts 100% conversion of DCM together with 90% HCl yield and insignificant by-product formation can be achieved at temperature around 500 °C. According to modelling, V₂O₅ should be stable at the conditions of DCM oxidation, while CuO would be more stable at higher temperature level (decomposition of CuCl₂ starts at 300 °C). MnCl₂ remains stable until 800 °C, which leads to deactivation of MnO₂ catalyst. Presence of steam inhibits the poisoning of the materials by chlorine based on thermodynamic calculation. XRF analysis supports the results of thermodynamic modelling — used MnO₂ and CuO catalysts contain chlorine, which was not detected in case of V₂O₅/Al₂O₃. CuO/γ-Al₂O₃ seems to be a good alternative to noble metal catalysts for the total oxidation of dichloromethane when used in the presence of steam and the temperatures above 300 °C to minimize Cl-poisoning. The outcomes of this study showed that the prepared metal oxides are promising catalysts to minimize pollution caused by chlorinated volatile organic compounds.

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Series: Journal of cleaner production
ISSN: 0959-6526
ISSN-E: 1879-1786
ISSN-L: 0959-6526
Volume: 228
Pages: 814 - 823
DOI: 10.1016/j.jclepro.2019.04.073
OADOI: https://oadoi.org/10.1016/j.jclepro.2019.04.073
Type of Publication: A1 Journal article – refereed
Field of Science: 218 Environmental engineering
Subjects:
Funding: The work was done with the financial support of the Thule Institute, Oulu University Scholarship Foundation (Yliopiston apteekin rahasto) and Tauno Tönning Foundation.
Copyright information: © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
  https://creativecommons.org/licenses/by-nc-nd/4.0/