Co-Mn mixed oxides prepared by magnetron sputtering on stainless steel meshes as catalysts for the oxidation of volatile organic compounds.

0547114 - ÚCHP 2022 IT eng A - Abstract
Topka, Pavel - Jirátová, Květa - Perekrestov, Roman - Dvořáková, M. - Balabánová, Jana - Koštejn, Martin - Pokorná, Dana - Čada, Martin - Hubička, Zdeněk - Kovanda, F.
Co-Mn mixed oxides prepared by magnetron sputtering on stainless steel meshes as catalysts for the oxidation of volatile organic compounds.
Onsite Conference olonne A + B. -: Science, Engineering, Technology Conferences Organisers, 2021. ISBN N.
[Edition Smart Materials and Surfaces /6./. 20.10.2021-22.10.2021, Milan]
R&D Projects: GA TA ČR(CZ) TN01000048
Institutional support: RVO:67985858 ; RVO:68378271
Keywords : cobalt–manganese mixed oxides * magnetron sputtering * stainless steel meshes
OECD category: Physical chemistry; Fluids and plasma physics (including surface physics) (FZU-D)
https://www.setcor.org/conferences/sms-2021/conference-program

Catalysts in the form of meshes possess a lot of advantages, especially low pressure drop and good heat transfer. Deposition of thin film of active phase on stainless steel meshes enables its high utilization in catalytic reaction due to low influence of internal diffusion of reactants and products. Oxides of Co and Mn show high catalytic activityh in various oxidation reactions. We have shown recently that the combination of magnetron sputtering and electrochemical deposition is a powerful tool to prepare highly active and stable catalyst for the oxidation of volatile organic compounds [1]. In the present study, we prepared Co-Mn mixed oxides supported on stainless steel meshes by magnetron sputtering of Mn or Co+Mn in the oxidation atmosphere, followed by calcination at 500 °C in air. The meshes were first pretreated by RF magnetron sputtering of Co to activate the metal surface. After that, a layer of Co3O4 (0.3 µm thick) was deposited electrochemically. The second layer was deposited by sputtering of Mn or Co+Mn in Ar+O2 to prepare either MnOx or mixed CoMnOx layers. Time of magnetron sputtering duration was changed to obtain different thicknesses of the MnOx or CoMnOx layers (0.1, 0.2 or 0.3 µm). In addition, pure MnOx and Co3O4 layers (thickness 2 µm) were prepared on meshes for comparison. In the total oxidation of ethanol, the activities of all sputtered catalysts were higher than that of the commercial pelletized Co-Mn-Al catalyst, although the content of the active components in the catalytic bed was more than 50 times lower. The highest catalytic activity exhibited the catalyst prepared by sputtering of MnOx layer over electrochemically deposited Co3O4. The pure MnOx catalyst supported on meshes showed the lowest temperature of 50 % ethanol conversion. However, two times higher amount of CO was formed over this catalyst in comparison with corresponding CoMnOx catalysts. Over the catalysts supported on meshes, the temperature required for 95 % conversion of ethanol to CO2 was by ~100 °C lower in comparison with commercial Co-Mn-Al pellets.
Permanent Link: http://hdl.handle.net/11104/0323446