Cordierite-Supported Transition-Metal-Oxide-Based Catalysts for Ozone Decomposition
Cordierite-based supported noble-metal-free catalysts for ozone decomposition are elaborated. The cordierite ceramic surface is pretreated with oxalic acid and NaOH, and Mn-Cu-Ni oxide catalysts are prepared by the impregnation method. The mass ratio of the supported oxides in the resulting catalyst...
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MDPI AG
2023-12-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/13/12/1674 |
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| author | Maria Chernykh Maria Grabchenko Alexey Knyazev Grigory Mamontov |
| author_facet | Maria Chernykh Maria Grabchenko Alexey Knyazev Grigory Mamontov |
| author_sort | Maria Chernykh |
| collection | DOAJ |
| description | Cordierite-based supported noble-metal-free catalysts for ozone decomposition are elaborated. The cordierite ceramic surface is pretreated with oxalic acid and NaOH, and Mn-Cu-Ni oxide catalysts are prepared by the impregnation method. The mass ratio of the supported oxides in the resulting catalysts is MnO<sub>2</sub>:CuO:NiO = 3:2:1, and their loadings are from 1.8 to 7.0 wt.%. The pretreated supports and catalysts are characterized by low-temperature N<sub>2</sub> adsorption, scanning electron microscopy (SEM), powder X-ray diffraction analysis (XRD), and temperature-programmed reduction with H<sub>2</sub> (TPR-H<sub>2</sub>). The catalysts are tested in ozone decomposition with high airflow rates (20 and 50 L/min) and with initial ozone concentrations of 1 and 2 ppm at temperatures in the range of 25–120 °C. It is shown that a combined treatment of cordierite with oxalic acid and NaOH leads to a developed porous structure and stabilization of supported Mn-Cu-Ni oxides in a highly dispersed state. The high activity of catalysts in ozone decomposition at room temperature and high airflow is demonstrated. The developed catalysts can be recommended for application in purification of air from the ozone because of their high catalytic activity, high mechanical stability, and relatively low weight and cost. |
| first_indexed | 2024-03-08T20:52:55Z |
| format | Article |
| id | doaj.art-985706e7b9e04626aaf51fbc64976ac7 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-08T20:52:55Z |
| publishDate | 2023-12-01 |
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| spelling | doaj.art-985706e7b9e04626aaf51fbc64976ac72023-12-22T14:01:57ZengMDPI AGCrystals2073-43522023-12-011312167410.3390/cryst13121674Cordierite-Supported Transition-Metal-Oxide-Based Catalysts for Ozone DecompositionMaria Chernykh0Maria Grabchenko1Alexey Knyazev2Grigory Mamontov3Chemical Faculty, Tomsk State University, 634050 Tomsk, RussiaChemical Faculty, Tomsk State University, 634050 Tomsk, RussiaChemical Faculty, Tomsk State University, 634050 Tomsk, RussiaChemical Faculty, Tomsk State University, 634050 Tomsk, RussiaCordierite-based supported noble-metal-free catalysts for ozone decomposition are elaborated. The cordierite ceramic surface is pretreated with oxalic acid and NaOH, and Mn-Cu-Ni oxide catalysts are prepared by the impregnation method. The mass ratio of the supported oxides in the resulting catalysts is MnO<sub>2</sub>:CuO:NiO = 3:2:1, and their loadings are from 1.8 to 7.0 wt.%. The pretreated supports and catalysts are characterized by low-temperature N<sub>2</sub> adsorption, scanning electron microscopy (SEM), powder X-ray diffraction analysis (XRD), and temperature-programmed reduction with H<sub>2</sub> (TPR-H<sub>2</sub>). The catalysts are tested in ozone decomposition with high airflow rates (20 and 50 L/min) and with initial ozone concentrations of 1 and 2 ppm at temperatures in the range of 25–120 °C. It is shown that a combined treatment of cordierite with oxalic acid and NaOH leads to a developed porous structure and stabilization of supported Mn-Cu-Ni oxides in a highly dispersed state. The high activity of catalysts in ozone decomposition at room temperature and high airflow is demonstrated. The developed catalysts can be recommended for application in purification of air from the ozone because of their high catalytic activity, high mechanical stability, and relatively low weight and cost.https://www.mdpi.com/2073-4352/13/12/1674ozone decompositioncordieritemanganese oxideshoneycomb catalystshierarchical porous structurenoble-metal-free catalyst |
| spellingShingle | Maria Chernykh Maria Grabchenko Alexey Knyazev Grigory Mamontov Cordierite-Supported Transition-Metal-Oxide-Based Catalysts for Ozone Decomposition Crystals ozone decomposition cordierite manganese oxides honeycomb catalysts hierarchical porous structure noble-metal-free catalyst |
| title | Cordierite-Supported Transition-Metal-Oxide-Based Catalysts for Ozone Decomposition |
| title_full | Cordierite-Supported Transition-Metal-Oxide-Based Catalysts for Ozone Decomposition |
| title_fullStr | Cordierite-Supported Transition-Metal-Oxide-Based Catalysts for Ozone Decomposition |
| title_full_unstemmed | Cordierite-Supported Transition-Metal-Oxide-Based Catalysts for Ozone Decomposition |
| title_short | Cordierite-Supported Transition-Metal-Oxide-Based Catalysts for Ozone Decomposition |
| title_sort | cordierite supported transition metal oxide based catalysts for ozone decomposition |
| topic | ozone decomposition cordierite manganese oxides honeycomb catalysts hierarchical porous structure noble-metal-free catalyst |
| url | https://www.mdpi.com/2073-4352/13/12/1674 |
| work_keys_str_mv | AT mariachernykh cordieritesupportedtransitionmetaloxidebasedcatalystsforozonedecomposition AT mariagrabchenko cordieritesupportedtransitionmetaloxidebasedcatalystsforozonedecomposition AT alexeyknyazev cordieritesupportedtransitionmetaloxidebasedcatalystsforozonedecomposition AT grigorymamontov cordieritesupportedtransitionmetaloxidebasedcatalystsforozonedecomposition |