University of Oulu

Bouchra Darif, Satu Ojala, Marja Kärkkäinen, Stéphane Pronier, Teuvo Maunula, Rachid Brahmi, Riitta L. Keiski, Study on sulfur deactivation of catalysts for DMDS oxidation, Applied Catalysis B: Environmental, Volume 206, 2017, Pages 653-665, ISSN 0926-3373,

Study on sulfur deactivation of catalysts for DMDS oxidation

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Author: Darif, Bouchra1,2; Ojala, Satu1; Kärkkäinen, Marja1;
Organizations: 1Environmental and Chemical Engineering (ECE), Faculty of Technology, P.O. Box 4300, FI-90014 University of Oulu, Finland
2Laboratory of Catalysis and Corrosion of Materials (LCCM), Department of Chemistry, Faculty of Sciences of El Jadida, University of Chouaib Doukkali, BP. 20, 24000 El Jadida, Morocco
3Institute of Chemistry of Poitiers, Materials and natural resources (IC2MP), CNRS-UMR 7285, University of Poitiers B27, Rue Michel Brunet, 86073 Poitiers Cedex 9, France
4Innovations and R&D, Catalyst Development, Dinex Ecocat Oy, 41330 Vihtavuori, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1 MB)
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Language: English
Published: Elsevier, 2017
Publish Date: 2019-06-05


In the present research, an industrially aged Pt/Al₂O₃ catalyst was used as a basis for the study on the sulfur deactivation and the development of more resistant catalytic materials. The catalytic activities of both industrially and laboratory-aged materials in DMDS oxidation were studied in addition to characterization by XRD, XPS, FESEM, TEM and N₂ adsorption. The industrial ageing induced a phase change from γ-Al₂O₃ towards θ-Al₂O₃, formation of aluminum sulfates and an increase in Pt particle size as well as a change in the oxidation state of Pt to a higher state. These changes caused an increase of 30 °C in the light-off temperature for DMDS oxidation. Accelerated ageing in the presence of SO₂ and H₂O vapor at 400 °C for 5 h decreased the activity of the Pt/Al₂O₃ at the same level than for the industrially aged catalyst even though smaller sulfur content and no sintering of γ-Al₂O₃ were observed. Pt sintering (10–20 nm) in both cases was observed. The XPS results confirmed the formation of new sulfate phases and the interaction between sulfur and the active phase as well as the support of the catalyst undergone accelerated ageing. After the accelerated ageing of copper-based catalysts, the 0.3Pt10Cu/Al₂O₃ǀ0.8SiO₂ǀ0.2 catalyst showed an interesting resistance towards sulfur deactivation, as it was expected.

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Series: Applied catalysis. B, Environmental
ISSN: 0926-3373
ISSN-E: 1873-3883
ISSN-L: 0926-3373
Volume: 206
Pages: 653 - 665
DOI: 10.1016/j.apcatb.2017.01.053
Type of Publication: A1 Journal article – refereed
Field of Science: 218 Environmental engineering
Copyright information: © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license