Studies of New Iridium Catalysts Supported on Modified Silicalite-1—Their Structure and Hydrogenating Properties
This paper investigates the catalytic properties of the iridium catalysts supported on modified silicalite-1. Post-synthesis modification of silicalite-1, with solutions of ammonium compounds (NH<sub>4</sub>F and NH<sub>4</sub>OH), appeared to be an efficient method to genera...
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| Online Access: | https://www.mdpi.com/1996-1944/14/16/4465 |
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| author | Michał Zieliński Monika Kot Mariusz Pietrowski Robert Wojcieszak Jolanta Kowalska-Kuś Ewa Janiszewska |
| author_facet | Michał Zieliński Monika Kot Mariusz Pietrowski Robert Wojcieszak Jolanta Kowalska-Kuś Ewa Janiszewska |
| author_sort | Michał Zieliński |
| collection | DOAJ |
| description | This paper investigates the catalytic properties of the iridium catalysts supported on modified silicalite-1. Post-synthesis modification of silicalite-1, with solutions of ammonium compounds (NH<sub>4</sub>F and NH<sub>4</sub>OH), appeared to be an efficient method to generate the acidic sites in starting support. The modification of support led not only to changes in its acidity but also its porosity—formation of additional micro- and mesopores. The novel materials were used as supports for iridium. The iridium catalysts (1 wt.% Ir) were characterized by N<sub>2</sub> adsorption/desorption measurements, temperature-programmed reduction with hydrogen (TPR-H<sub>2</sub>), H<sub>2</sub> chemisorption, transmission electron microscopy (TEM), temperature-programmed desorption of ammonia (TPD-NH<sub>3</sub>), X-ray photoelectron spectroscopy (XPS) and tested in the hydrogenation of toluene reaction. The catalytic activity of iridium supported on silicalite-1 treated with NH<sub>4</sub>OH (higher porosity of support, better dispersion of active phase) was much higher than that of Ir supported on unmodified and modified with NH<sub>4</sub>F silicalite-1. |
| first_indexed | 2024-03-10T08:38:50Z |
| format | Article |
| id | doaj.art-28583a85dec245cd900dcdb807d95318 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T08:38:50Z |
| publishDate | 2021-08-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-28583a85dec245cd900dcdb807d953182023-11-22T08:27:54ZengMDPI AGMaterials1996-19442021-08-011416446510.3390/ma14164465Studies of New Iridium Catalysts Supported on Modified Silicalite-1—Their Structure and Hydrogenating PropertiesMichał Zieliński0Monika Kot1Mariusz Pietrowski2Robert Wojcieszak3Jolanta Kowalska-Kuś4Ewa Janiszewska5Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, PolandFaculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, PolandFaculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, PolandUniversité Lille, CNRS, Centrale Lille, Université Artois, UMR 8181-UCCS-Unité de Catalyse et Chimie du Solide, F-59000 Lille, FranceFaculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, PolandFaculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, PolandThis paper investigates the catalytic properties of the iridium catalysts supported on modified silicalite-1. Post-synthesis modification of silicalite-1, with solutions of ammonium compounds (NH<sub>4</sub>F and NH<sub>4</sub>OH), appeared to be an efficient method to generate the acidic sites in starting support. The modification of support led not only to changes in its acidity but also its porosity—formation of additional micro- and mesopores. The novel materials were used as supports for iridium. The iridium catalysts (1 wt.% Ir) were characterized by N<sub>2</sub> adsorption/desorption measurements, temperature-programmed reduction with hydrogen (TPR-H<sub>2</sub>), H<sub>2</sub> chemisorption, transmission electron microscopy (TEM), temperature-programmed desorption of ammonia (TPD-NH<sub>3</sub>), X-ray photoelectron spectroscopy (XPS) and tested in the hydrogenation of toluene reaction. The catalytic activity of iridium supported on silicalite-1 treated with NH<sub>4</sub>OH (higher porosity of support, better dispersion of active phase) was much higher than that of Ir supported on unmodified and modified with NH<sub>4</sub>F silicalite-1.https://www.mdpi.com/1996-1944/14/16/4465iridium catalystmodified silicalite-1surface aciditytoluene hydrogenation |
| spellingShingle | Michał Zieliński Monika Kot Mariusz Pietrowski Robert Wojcieszak Jolanta Kowalska-Kuś Ewa Janiszewska Studies of New Iridium Catalysts Supported on Modified Silicalite-1—Their Structure and Hydrogenating Properties Materials iridium catalyst modified silicalite-1 surface acidity toluene hydrogenation |
| title | Studies of New Iridium Catalysts Supported on Modified Silicalite-1—Their Structure and Hydrogenating Properties |
| title_full | Studies of New Iridium Catalysts Supported on Modified Silicalite-1—Their Structure and Hydrogenating Properties |
| title_fullStr | Studies of New Iridium Catalysts Supported on Modified Silicalite-1—Their Structure and Hydrogenating Properties |
| title_full_unstemmed | Studies of New Iridium Catalysts Supported on Modified Silicalite-1—Their Structure and Hydrogenating Properties |
| title_short | Studies of New Iridium Catalysts Supported on Modified Silicalite-1—Their Structure and Hydrogenating Properties |
| title_sort | studies of new iridium catalysts supported on modified silicalite 1 their structure and hydrogenating properties |
| topic | iridium catalyst modified silicalite-1 surface acidity toluene hydrogenation |
| url | https://www.mdpi.com/1996-1944/14/16/4465 |
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