Magnesium Effect in K/Co-Mg-Mn-Al Mixed Oxide Catalyst for Direct NO Decomposition
Emission of nitric oxide represents a serious environmental problem since it contributes to the formation of acid rain and photochemical smog. Potassium-modified Co-Mn-Al mixed oxide is an effective catalyst for NO decomposition. However, there are problems related to the thermal instability of pota...
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MDPI AG
2020-08-01
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| Series: | Catalysts |
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| Online Access: | https://www.mdpi.com/2073-4344/10/8/931 |
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| author | Kateřina Karásková Kateřina Pacultová Anna Klegova Dagmar Fridrichová Marta Valášková Květuše Jirátová Paweł Stelmachowski Andrzej Kotarba Lucie Obalová |
| author_facet | Kateřina Karásková Kateřina Pacultová Anna Klegova Dagmar Fridrichová Marta Valášková Květuše Jirátová Paweł Stelmachowski Andrzej Kotarba Lucie Obalová |
| author_sort | Kateřina Karásková |
| collection | DOAJ |
| description | Emission of nitric oxide represents a serious environmental problem since it contributes to the formation of acid rain and photochemical smog. Potassium-modified Co-Mn-Al mixed oxide is an effective catalyst for NO decomposition. However, there are problems related to the thermal instability of potassium species and a high content of toxic and expensive cobalt. The reported research aimed to determine whether these shortcomings can be overcome by replacing cobalt with magnesium. Therefore, a series of Co-Mg-Mn-Al mixed oxides with different Co/Mg molar ratio and promoted by various content of potassium was investigated. The catalysts were thoroughly characterized by atomic absorption spectroscopy (AAS), temperature-programmed reduction by hydrogen (TPR-H<sub>2</sub>), temperature-programmed desorption of CO<sub>2</sub> (TPD-CO<sub>2</sub>), X-ray powder diffraction (XRD), N<sub>2</sub> physisorption, species-resolved thermal alkali desorption (SR-TAD), and tested in direct NO decomposition with and without the addition of oxygen and water vapor. Partial substitution of magnesium for cobalt did not cause an activity decrease when the optimal molar ratio of K/Co on the normalized surface area was maintained; it means that the portion of expensive and toxic cobalt can be successfully replaced by magnesium without any decrease in catalytic activity. |
| first_indexed | 2024-03-10T17:28:30Z |
| format | Article |
| id | doaj.art-7ab85fdc5df246f181696d7496177c6e |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-10T17:28:30Z |
| publishDate | 2020-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Catalysts |
| spelling | doaj.art-7ab85fdc5df246f181696d7496177c6e2023-11-20T10:05:54ZengMDPI AGCatalysts2073-43442020-08-0110893110.3390/catal10080931Magnesium Effect in K/Co-Mg-Mn-Al Mixed Oxide Catalyst for Direct NO DecompositionKateřina Karásková0Kateřina Pacultová1Anna Klegova2Dagmar Fridrichová3Marta Valášková4Květuše Jirátová5Paweł Stelmachowski6Andrzej Kotarba7Lucie Obalová8Institute of Environmental Technology, VSB-Technical University of Ostrava, 17. listopadu 15/2172, 70800 Ostrava, Czech RepublicInstitute of Environmental Technology, VSB-Technical University of Ostrava, 17. listopadu 15/2172, 70800 Ostrava, Czech RepublicInstitute of Environmental Technology, VSB-Technical University of Ostrava, 17. listopadu 15/2172, 70800 Ostrava, Czech RepublicInstitute of Environmental Technology, VSB-Technical University of Ostrava, 17. listopadu 15/2172, 70800 Ostrava, Czech RepublicInstitute of Environmental Technology, VSB-Technical University of Ostrava, 17. listopadu 15/2172, 70800 Ostrava, Czech RepublicInstitute of Chemical Process Fundamentals, Czech Academy of Sciences, Rozvojová 2/135, 16502 Prague, Czech RepublicFaculty of Chemistry, Jagiellonian University in Krakow, Gronostajowa 2, PL-30387 Krakow, PolandFaculty of Chemistry, Jagiellonian University in Krakow, Gronostajowa 2, PL-30387 Krakow, PolandInstitute of Environmental Technology, VSB-Technical University of Ostrava, 17. listopadu 15/2172, 70800 Ostrava, Czech RepublicEmission of nitric oxide represents a serious environmental problem since it contributes to the formation of acid rain and photochemical smog. Potassium-modified Co-Mn-Al mixed oxide is an effective catalyst for NO decomposition. However, there are problems related to the thermal instability of potassium species and a high content of toxic and expensive cobalt. The reported research aimed to determine whether these shortcomings can be overcome by replacing cobalt with magnesium. Therefore, a series of Co-Mg-Mn-Al mixed oxides with different Co/Mg molar ratio and promoted by various content of potassium was investigated. The catalysts were thoroughly characterized by atomic absorption spectroscopy (AAS), temperature-programmed reduction by hydrogen (TPR-H<sub>2</sub>), temperature-programmed desorption of CO<sub>2</sub> (TPD-CO<sub>2</sub>), X-ray powder diffraction (XRD), N<sub>2</sub> physisorption, species-resolved thermal alkali desorption (SR-TAD), and tested in direct NO decomposition with and without the addition of oxygen and water vapor. Partial substitution of magnesium for cobalt did not cause an activity decrease when the optimal molar ratio of K/Co on the normalized surface area was maintained; it means that the portion of expensive and toxic cobalt can be successfully replaced by magnesium without any decrease in catalytic activity.https://www.mdpi.com/2073-4344/10/8/931cobalt mixed oxidealkali promoternitric oxidecatalytic decomposition |
| spellingShingle | Kateřina Karásková Kateřina Pacultová Anna Klegova Dagmar Fridrichová Marta Valášková Květuše Jirátová Paweł Stelmachowski Andrzej Kotarba Lucie Obalová Magnesium Effect in K/Co-Mg-Mn-Al Mixed Oxide Catalyst for Direct NO Decomposition Catalysts cobalt mixed oxide alkali promoter nitric oxide catalytic decomposition |
| title | Magnesium Effect in K/Co-Mg-Mn-Al Mixed Oxide Catalyst for Direct NO Decomposition |
| title_full | Magnesium Effect in K/Co-Mg-Mn-Al Mixed Oxide Catalyst for Direct NO Decomposition |
| title_fullStr | Magnesium Effect in K/Co-Mg-Mn-Al Mixed Oxide Catalyst for Direct NO Decomposition |
| title_full_unstemmed | Magnesium Effect in K/Co-Mg-Mn-Al Mixed Oxide Catalyst for Direct NO Decomposition |
| title_short | Magnesium Effect in K/Co-Mg-Mn-Al Mixed Oxide Catalyst for Direct NO Decomposition |
| title_sort | magnesium effect in k co mg mn al mixed oxide catalyst for direct no decomposition |
| topic | cobalt mixed oxide alkali promoter nitric oxide catalytic decomposition |
| url | https://www.mdpi.com/2073-4344/10/8/931 |
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