Berniak, T.; Latka, P.; Drozdek, M.; Rokicinska, A.; Jaworski, A.; Leyva Perez, A.; Kustrowski, P. (2024). Covalent bonding of N-hydroxyphthalimide on mesoporous silica for catalytic aerobic oxidation of p-xylene at atmospheric pressure. ChemPlusChem. 89(6). https://doi.org/10.1002/cplu.202300631
Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10251/210274
[EN] The surface of SBA-15 mesoporous silica was modified by N-hydroxyphthalimide (NHPI) moieties acting as immobilized active species for aerobic oxidation of alkylaromatic hydrocarbons. The incorporation was carried out ...[+]
[EN] The surface of SBA-15 mesoporous silica was modified by N-hydroxyphthalimide (NHPI) moieties acting as immobilized active species for aerobic oxidation of alkylaromatic hydrocarbons. The incorporation was carried out by four original approaches: the grafting-from and grafting-onto techniques, using the presence of surface silanols enabling the formation of particularly stable O-Si-C bonds between the silica support and the organic modifier. The strategies involving the Heck coupling led to the formation of NHPI groups separated from the SiO2 surface by a vinyl linker, while one of the developed modification paths based on the grafting of an appropriate organosilane coupling agent resulted in the active phase devoid of this structural element. The successful course of the synthesis was verified by FTIR and H-1 NMR measurements. Furthermore, the formed materials were examined in terms of their chemical composition (elemental analysis, thermal analysis), structure of surface groups (C-13 NMR, XPS), porosity (low-temperature N-2 adsorption), and tested as catalysts in the aerobic oxidation of p-xylene at atmospheric pressure. The highest conversion and selectivity to p-toluic acid were achieved using the catalyst with enhanced availability of non-hydrolyzed NHPI groups in the pore system. The catalytic stability of the material was additionally confirmed in several subsequent reaction cycles.[-]
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-115100GB-I00/ES/CLUSTERES CATALITICOS MULTIMETALICOS Y DE ALTA ENTROPIA PARA SINTESIS ORGANICA/ info:eu-repo/grantAgreement/EC//POWR.03.02.00-00-I004%2F16/ info:eu-repo/grantAgreement/FEDER//POIG.02.01.00-12-023%2F08/ info:eu-repo/grantAgreement/MICINN//CEX2021-001230-S/
Thanks:
T.B. has been partly supported by the EU Project POWR.03.02.00-00-I004/16, and the projects PID2020-115100GB-I00 and Severo Ochoa CEX2021-001230-S (both funded by MCIINN, the former by MCIN/AEI/10.13039/501100011033MICIIN). ...[+]
T.B. has been partly supported by the EU Project POWR.03.02.00-00-I004/16, and the projects PID2020-115100GB-I00 and Severo Ochoa CEX2021-001230-S (both funded by MCIINN, the former by MCIN/AEI/10.13039/501100011033MICIIN). Some measurements were carried out with the equipment purchased thanks to the financial support of the European Regional Development Fund in the framework of the Polish Innovation Economy Operational Program (contract no. POIG.02.01.00-12-023/08). The financial support of the Strategic Programme Excellence Initiative at Jagiellonian University, used for servicing measurement systems, is also appreciated.[-]