Nevanperä, T.K.; Ojala, S.; Laitinen, T.; Pitkäaho, S.; Saukko, S.; Keiski, R.L. Catalytic Oxidation of Dimethyl Disulfide over Bimetallic Cu–Au and Pt–Au Catalysts Supported on γ-Al2O3, CeO2, and CeO2–Al2O3. Catalysts 2019, 9, 603. https://doi.org/10.3390/catal9070603
Catalytic oxidation of dimethyl disulfide over bimetallic Cu–Au and Pt–Au catalysts supported on γ-Al₂O₃, CeO₂, and CeO₂–Al₂O₃
|Author:||Nevanperä, Tuomas K.1; Ojala, Satu1; Laitinen, Tiina1;|
1Faculty of Technology, Environmental and Chemical Engineering, University of Oulu, P.O. Box 4300, FI-90014 Oulu, Finland
2Center of Microscopy and Nanotechnology, University of Oulu, P.O. Box 7150, FI-90014 Oulu, Finland
|Online Access:||PDF Full Text (PDF, 5.8 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2019071923146
Multidisciplinary Digital Publishing Institute,
|Publish Date:|| 2019-07-19
Dimethyl disulfide (DMDS, CH3SSCH3) is an odorous and harmful air pollutant (volatile organic compound (VOC)) causing nuisance in urban areas. The abatement of DMDS emissions from industrial sources can be realized through catalytic oxidation. However, the development of active and selective catalysts having good resistance toward sulfur poisoning is required. This paper describes an investigation related to improving the performance of Pt and Cu catalysts through the addition of Au to monometallic “parent” catalysts via surface redox reactions. The catalysts were characterized using ICP-OES, N2 physisorption, XRD, XPS, HR-TEM, H2-TPR, NH3-TPD, CO2-TPD, and temperature-programmed 18O2 isotopic exchange. The performance of the catalysts was evaluated in DMDS total oxidation. In addition, the stability of a Pt–Au/Ce–Al catalyst was investigated through 40 h time onstream. Cu–Au catalysts were observed to be more active than corresponding Pt–Au catalysts based on DMDS light-off experiments. However, the reaction led to a higher amount of oxygen-containing byproduct formation, and thus the Pt–Au catalysts were more selective. H2-TPR showed that the higher redox capacity of the Cu-containing catalysts may have been the reason for better DMDS conversion and lower selectivity. The lower amount of reactive oxygen on the surface of Pt-containing catalysts was beneficial for total oxidation. The improved selectivity of ceria-containing catalysts after the Au addition may have resulted from the lowered amount of reactive oxygen as well. The Au addition improved the activity of Al2O3-supported Cu and Pt. The Au addition also had a positive effect on SO2 production in a higher temperature region. A stability test of 40 h showed that the Pt–Au/Ce–Al catalyst, while otherwise promising, was not stable enough, and further development is still needed.
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
218 Environmental engineering
This research was funded by the Council of Oulu region from the European Regional Development Fund (A32164), the City of Oulu, and the Maj and Tor Nessling Foundation. The Finnish Foundation for Technology Promotion, Walter Ahlström Foundation, KAUTE Foundation, Tauno Tönning Foundation, and University of Oulu Graduate School are acknowledged for their financial support for the research reported in this paper. The work leading to these results also gained funding from the European Union Seventh Framework Programme [FP7/2007-2013] under the grant agreement n◦ [PIRSES-GA-2012-317714]. The financial support of the Jenny and Antti Wihuri Foundation is acknowledged.
© 2019 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 (http://creativecommons.org/licenses/by/4.0/).