Effect of Zinc on the Structure and Activity of the Cobalt Oxide Catalysts for NO Decomposition
Co<sub>4−i</sub>Zn<sub>i</sub>MnAlO<sub>x</sub> mixed oxides (<i>i</i> = 0, 0.5 and 1) were prepared by coprecipitation, subsequently modified with potassium (2 or 4 wt.% K), and investigated for direct catalytic NO decomposition, one of the most attra...
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| Format: | Article |
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MDPI AG
2022-12-01
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| Online Access: | https://www.mdpi.com/2073-4344/13/1/18 |
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| author | Kateřina Karásková Kateřina Pacultová Tereza Bílková Dagmar Fridrichová Martin Koštejn Pavlína Peikertová Paweł Stelmachowski Pavel Kukula Lucie Obalová |
| author_facet | Kateřina Karásková Kateřina Pacultová Tereza Bílková Dagmar Fridrichová Martin Koštejn Pavlína Peikertová Paweł Stelmachowski Pavel Kukula Lucie Obalová |
| author_sort | Kateřina Karásková |
| collection | DOAJ |
| description | Co<sub>4−i</sub>Zn<sub>i</sub>MnAlO<sub>x</sub> mixed oxides (<i>i</i> = 0, 0.5 and 1) were prepared by coprecipitation, subsequently modified with potassium (2 or 4 wt.% K), and investigated for direct catalytic NO decomposition, one of the most attractive and challenging NO<sub>x</sub> abatement processes. The catalysts were characterised by atomic absorption spectroscopy, powder X-ray diffraction, Raman and infrared spectroscopy, temperature-programmed reduction by hydrogen, the temperature-programmed desorption of CO<sub>2</sub> and NO, X-ray photoelectron spectroscopy, scanning electron microscopy, the work function, and N<sub>2</sub> physisorption. The partial substitution of cobalt increased the specific surface area, decreased the pore sizes, influenced the surface composition, and obtained acid-base properties as a result of the higher availability of medium and strong basic sites. No visible changes in the morphology, crystallite size, and work function were observed upon the cobalt substitution. The conversion of NO increased after the Co substitution, however, the increase in the amount of zinc did not affect the catalytic activity, whereas a higher amount of potassium caused a decrease in the NO conversion. The results obtained, which were predominantly the acid-base characteristics of the catalyst, are in direct correlation with the proposed NO decomposition reaction mechanisms with NO<sub>x</sub><sup>−</sup> as the main reaction intermediates. |
| first_indexed | 2024-03-09T13:16:00Z |
| format | Article |
| id | doaj.art-f07975b8dbaf4f97b54e1edad889ea3b |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-09T13:16:00Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Catalysts |
| spelling | doaj.art-f07975b8dbaf4f97b54e1edad889ea3b2023-11-30T21:35:54ZengMDPI AGCatalysts2073-43442022-12-011311810.3390/catal13010018Effect of Zinc on the Structure and Activity of the Cobalt Oxide Catalysts for NO DecompositionKateřina Karásková0Kateřina Pacultová1Tereza Bílková2Dagmar Fridrichová3Martin Koštejn4Pavlína Peikertová5Paweł Stelmachowski6Pavel Kukula7Lucie Obalová8Institute of Environmental Technology, CEET, VSB-Technical University of Ostrava, 17. listopadu 15/2172, 708 00 Ostrava, Czech RepublicInstitute of Environmental Technology, CEET, VSB-Technical University of Ostrava, 17. listopadu 15/2172, 708 00 Ostrava, Czech RepublicInstitute of Environmental Technology, CEET, VSB-Technical University of Ostrava, 17. listopadu 15/2172, 708 00 Ostrava, Czech RepublicInstitute of Environmental Technology, CEET, VSB-Technical University of Ostrava, 17. listopadu 15/2172, 708 00 Ostrava, Czech RepublicInstitute of Chemical Process Fundamentals of the CAS, v. v. i., Rozvojová 2/135, 165 02 Prague, Czech RepublicNanotechnology Centre, CEET, VSB-Technical University of Ostrava, 17. listopadu 15/2172, 708 00 Ostrava, Czech RepublicFaculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Krakow, PolandRanido, s.r.o., Thákurova 531/4, 160 00 Prague, Czech RepublicInstitute of Environmental Technology, CEET, VSB-Technical University of Ostrava, 17. listopadu 15/2172, 708 00 Ostrava, Czech RepublicCo<sub>4−i</sub>Zn<sub>i</sub>MnAlO<sub>x</sub> mixed oxides (<i>i</i> = 0, 0.5 and 1) were prepared by coprecipitation, subsequently modified with potassium (2 or 4 wt.% K), and investigated for direct catalytic NO decomposition, one of the most attractive and challenging NO<sub>x</sub> abatement processes. The catalysts were characterised by atomic absorption spectroscopy, powder X-ray diffraction, Raman and infrared spectroscopy, temperature-programmed reduction by hydrogen, the temperature-programmed desorption of CO<sub>2</sub> and NO, X-ray photoelectron spectroscopy, scanning electron microscopy, the work function, and N<sub>2</sub> physisorption. The partial substitution of cobalt increased the specific surface area, decreased the pore sizes, influenced the surface composition, and obtained acid-base properties as a result of the higher availability of medium and strong basic sites. No visible changes in the morphology, crystallite size, and work function were observed upon the cobalt substitution. The conversion of NO increased after the Co substitution, however, the increase in the amount of zinc did not affect the catalytic activity, whereas a higher amount of potassium caused a decrease in the NO conversion. The results obtained, which were predominantly the acid-base characteristics of the catalyst, are in direct correlation with the proposed NO decomposition reaction mechanisms with NO<sub>x</sub><sup>−</sup> as the main reaction intermediates.https://www.mdpi.com/2073-4344/13/1/18nitric oxidecatalytic decompositionCo-spinelZn bulk promotion |
| spellingShingle | Kateřina Karásková Kateřina Pacultová Tereza Bílková Dagmar Fridrichová Martin Koštejn Pavlína Peikertová Paweł Stelmachowski Pavel Kukula Lucie Obalová Effect of Zinc on the Structure and Activity of the Cobalt Oxide Catalysts for NO Decomposition Catalysts nitric oxide catalytic decomposition Co-spinel Zn bulk promotion |
| title | Effect of Zinc on the Structure and Activity of the Cobalt Oxide Catalysts for NO Decomposition |
| title_full | Effect of Zinc on the Structure and Activity of the Cobalt Oxide Catalysts for NO Decomposition |
| title_fullStr | Effect of Zinc on the Structure and Activity of the Cobalt Oxide Catalysts for NO Decomposition |
| title_full_unstemmed | Effect of Zinc on the Structure and Activity of the Cobalt Oxide Catalysts for NO Decomposition |
| title_short | Effect of Zinc on the Structure and Activity of the Cobalt Oxide Catalysts for NO Decomposition |
| title_sort | effect of zinc on the structure and activity of the cobalt oxide catalysts for no decomposition |
| topic | nitric oxide catalytic decomposition Co-spinel Zn bulk promotion |
| url | https://www.mdpi.com/2073-4344/13/1/18 |
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