MnOx catalysts supported on SBA-15 and MCM-41 silicas for a competitive VOCs mixture oxidation: In-situ DRIFTS investigations

• Published in: Applied catalysis. B, Environmental Environmental, 2024-05, Vol.344, p.123613, Article 123613
• Main Authors: Moreno-Román, E.J., Can, F., Meille, V., Guilhaume, N., González-Cobos, J., Gil, S.
• Format: Article
• Language: English
• Subjects: Catalysis; Chemical Sciences; Environment and Society; Environmental Sciences; In-situ DRIFTS; MCM-41; SBA-15; Supported MnOx catalysts; VOCs binary mixture
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2023.123613

The catalytic oxidation of different volatile organic compounds (VOCs) has been widely studied for several decades within the field of air depollution. However, there is still much to understand regarding the effects that these VOCs have on each other when they are blended together in the reaction mixture, as would be expected in many emissions. Herein, the catalytic oxidation of toluene and 2-propanol on supported manganese oxides under both single and binary VOCs oxidation conditions has been studied. We have found the catalyst activity for VOCs mineralization and its selectivity towards other by-products (i.e., acetone or propylene from 2-propanol) to be strongly dependent on the reaction conditions, the catalyst redox properties and support acidity. We have also assessed the promotion/inhibition effects derived from the VOCs mixture and proposed the reaction mechanism in each case by means of in-situ DRIFTS measurements. [Display omitted] •MnOx on MCM and SBA were tested for competitive VOC oxidation with in-situ DRIFTS.•MnOx/MCM has higher surface concentration of Mn3+, active O species and acidity.•MnOx/MCM is more active than MnOx/SBA for both toluene and isopropanol oxidation.•MnOx/MCM is selective to iPrOH dehydration and MnOx/SBA to iPrOH dehydrogenation.•Toluene-iPrOH mixture effect favored selective oxidation and hindered combustion.