Spherical Al-MCM-41 Doped with Copper by Modified TIE Method as Effective Catalyst for Low-Temperature NH<sub>3</sub>-SCR
Aluminum containing silica spherical MCM-41 was synthesized and modified with copper by the template ion-exchange method (TIE) and its modified version, including treatment of the samples with ammonia solution directly after template ion-exchange (TIE-NH<sub>3</sub>). The obtained sample...
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MDPI AG
2021-03-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/26/6/1807 |
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| author | Aleksandra Jankowska Andrzej Kowalczyk Małgorzata Rutkowska Marek Michalik Lucjan Chmielarz |
| author_facet | Aleksandra Jankowska Andrzej Kowalczyk Małgorzata Rutkowska Marek Michalik Lucjan Chmielarz |
| author_sort | Aleksandra Jankowska |
| collection | DOAJ |
| description | Aluminum containing silica spherical MCM-41 was synthesized and modified with copper by the template ion-exchange method (TIE) and its modified version, including treatment of the samples with ammonia solution directly after template ion-exchange (TIE-NH<sub>3</sub>). The obtained samples were characterized with respect to their chemical composition (ICP-OES), structure (XRD), texture (low temperature N<sub>2</sub> sorption), morphology (SEM-EDS), form and aggregation of deposited copper species (UV-vis DRS), reducibility of copper species (H<sub>2</sub>-TPR), and surface acidity (NH<sub>3</sub>-TPD). The deposition of copper by the TIE-NH<sub>3</sub> method resulted in much better dispersion of this metal on the MCM-41 surface comparing to copper introduced by TIE method. It was shown that such highly dispersed copper species, mainly monomeric Cu<sup>2+</sup> cations, deposited on aluminum containing silica spheres of MCM-41, are significantly more catalytically effective in the NH<sub>3</sub>-SCR process than analogous catalysts containing aggregated copper oxide species. The catalysts obtained by the TIE-NH<sub>3</sub> method effectively operated in much broader temperature and were less active in the side process of direct ammonia oxidation by oxygen. |
| first_indexed | 2024-03-10T12:59:04Z |
| format | Article |
| id | doaj.art-7c927bf9c8f14f82a598e74fcff351f7 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-10T12:59:04Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-7c927bf9c8f14f82a598e74fcff351f72023-11-21T11:40:17ZengMDPI AGMolecules1420-30492021-03-01266180710.3390/molecules26061807Spherical Al-MCM-41 Doped with Copper by Modified TIE Method as Effective Catalyst for Low-Temperature NH<sub>3</sub>-SCRAleksandra Jankowska0Andrzej Kowalczyk1Małgorzata Rutkowska2Marek Michalik3Lucjan Chmielarz4Faculty of Chemistry, Jagiellonian University in Kraków, Gronostajowa 2, 30-387 Krakow, PolandFaculty of Chemistry, Jagiellonian University in Kraków, Gronostajowa 2, 30-387 Krakow, PolandFaculty of Chemistry, Jagiellonian University in Kraków, Gronostajowa 2, 30-387 Krakow, PolandInstitute of Geological Sciences, Jagiellonian University in Kraków, Gronostajowa 3a, 30-387 Krakow, PolandFaculty of Chemistry, Jagiellonian University in Kraków, Gronostajowa 2, 30-387 Krakow, PolandAluminum containing silica spherical MCM-41 was synthesized and modified with copper by the template ion-exchange method (TIE) and its modified version, including treatment of the samples with ammonia solution directly after template ion-exchange (TIE-NH<sub>3</sub>). The obtained samples were characterized with respect to their chemical composition (ICP-OES), structure (XRD), texture (low temperature N<sub>2</sub> sorption), morphology (SEM-EDS), form and aggregation of deposited copper species (UV-vis DRS), reducibility of copper species (H<sub>2</sub>-TPR), and surface acidity (NH<sub>3</sub>-TPD). The deposition of copper by the TIE-NH<sub>3</sub> method resulted in much better dispersion of this metal on the MCM-41 surface comparing to copper introduced by TIE method. It was shown that such highly dispersed copper species, mainly monomeric Cu<sup>2+</sup> cations, deposited on aluminum containing silica spheres of MCM-41, are significantly more catalytically effective in the NH<sub>3</sub>-SCR process than analogous catalysts containing aggregated copper oxide species. The catalysts obtained by the TIE-NH<sub>3</sub> method effectively operated in much broader temperature and were less active in the side process of direct ammonia oxidation by oxygen.https://www.mdpi.com/1420-3049/26/6/1807silica-alumina spherical MCM-41coppertemplate ion-exchange methodNH<sub>3</sub>-SCR |
| spellingShingle | Aleksandra Jankowska Andrzej Kowalczyk Małgorzata Rutkowska Marek Michalik Lucjan Chmielarz Spherical Al-MCM-41 Doped with Copper by Modified TIE Method as Effective Catalyst for Low-Temperature NH<sub>3</sub>-SCR Molecules silica-alumina spherical MCM-41 copper template ion-exchange method NH<sub>3</sub>-SCR |
| title | Spherical Al-MCM-41 Doped with Copper by Modified TIE Method as Effective Catalyst for Low-Temperature NH<sub>3</sub>-SCR |
| title_full | Spherical Al-MCM-41 Doped with Copper by Modified TIE Method as Effective Catalyst for Low-Temperature NH<sub>3</sub>-SCR |
| title_fullStr | Spherical Al-MCM-41 Doped with Copper by Modified TIE Method as Effective Catalyst for Low-Temperature NH<sub>3</sub>-SCR |
| title_full_unstemmed | Spherical Al-MCM-41 Doped with Copper by Modified TIE Method as Effective Catalyst for Low-Temperature NH<sub>3</sub>-SCR |
| title_short | Spherical Al-MCM-41 Doped with Copper by Modified TIE Method as Effective Catalyst for Low-Temperature NH<sub>3</sub>-SCR |
| title_sort | spherical al mcm 41 doped with copper by modified tie method as effective catalyst for low temperature nh sub 3 sub scr |
| topic | silica-alumina spherical MCM-41 copper template ion-exchange method NH<sub>3</sub>-SCR |
| url | https://www.mdpi.com/1420-3049/26/6/1807 |
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