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Surface chemistry and catalytic activity in H$_2$O$_2$ decomposition of pyrolytically fluoralkylated activated carbons

Mussabek, Gauhar; Baktygerey, Saule; Taurbayev, Yerzhan; Yermukhamed, Dana; Zhylkybayeva, Nazym; Zaderko, Alexander N.; Diyuk, Vitaliy E.; Afonin, Sergii 1; Yar-Mukhamedova, Gulmira; Mariychuk, Ruslan T.; Grishchenko, Liudmyla M.; Kaňuchová, Mária; Lisnyak, Vladyslav V.
1 Institut für Biologische Grenzflächen (IBG), Karlsruher Institut für Technologie (KIT)

Abstract:

According to the proposed pyrolytic method, granular activated carbon (AC) Norit 830 W was functionalized by thermal treatment of AC in hydrofluorocarbon (HFC) gases, pentafluoroethane and 1,1,1,2-tetrafluoroethane, at 400–800 °C. This method does not require activation by plasma and photons. Chemical and elemental analysis showed that the pyrolytic treatment provides a loading of 2.95 mmol (5.6 wt%) of fluorine per gram of AC. Nitrogen adsorption measurements indicated that the
microporous structure contracted when AC was treated with HFC at temperatures above 400 °C. Thermogravimetry, Fourier transform infrared spectroscopy (FTIR) with attenuated total reflectance (ATR), and X-ray photoelectron spectroscopy (XPS) demonstrated the evolution of oxygen-containing and fluorine-containing groups to more thermostable groups with treatment temperature. The fluorine-containing groups grafted at high temperature, above 600 °C exhibited the highest thermal
stability up to 1250 °C in dry argon. From the data of XPS and solid-state $^{19}$F nuclear magnetic resonance spectroscopy data, the grafted fluorine exists in several types of grafted F-containing groups, the HFC residues. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000174418
Veröffentlicht am 20.09.2024
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Biologische Grenzflächen (IBG)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2024
Sprache Englisch
Identifikator ISSN: 2046-2069
KITopen-ID: 1000174418
HGF-Programm 47.14.01 (POF IV, LK 01) Molekular Information Processing in Cellular Systems
Erschienen in RSC Advances
Verlag Royal Society of Chemistry (RSC)
Band 14
Heft 40
Seiten 29052–29071
Vorab online veröffentlicht am 12.09.2024
Nachgewiesen in Dimensions
Web of Science
Scopus
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