Synthesis and characterization of mesoporous carbons using zeolitic templates and formation of organoaluminum fluoride structures.
Sakintuna, Billur and Yürüm, Yuda (2006) Synthesis and characterization of mesoporous carbons using zeolitic templates and formation of organoaluminum fluoride structures. In: 4th Chemical Engineering Conference for Collaborative Research in Mediterranean Countries, Session 3, Advanced Materials and Nanotechnology, Dead Sea, Israel
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The template carbonization method has been proposed for the production of mesoporous carbons. templated from Turkish natural zeolite. The effects of different washing solutions for removing the template on the carbon structure were discussed. BET surface areas of natural zeolite templated carbons, washed with HF, were 397.2, 349.9, 404.7 and 367.1 m2/g at 700, 800, 900 and 1000°C, respectively. Fluorine contents were roughly 70 %, 54 %, 52 % and 62 % at 700, 800, 900 and 1000°C respectively. During removal of the zeolite template by washing with HF, organoaluminum fluoride constitutes were formed. In SEM image of natural zeolite templated carbon, carbonized at 700°C, some flower-like structures were observed, which consisted of mainly fluorine, carbons and aluminum. According to 19F MAS NMR spectra of this carbon, Al2F2, AlFC3, AlF2C2, and AlF3C groups were observed. In XRD pattern, peaks were belonging to aluminium hydroxide fluoride. The d002 value of this carbon was 0.358 nm, and the Lc value was 2.76 nm. Average numbers of graphene sheets per stack was calculated as 15, 13, 9, 8 and 7 when resultant carbons washed with HCl, NaOH, HCl-NaOH, HF and HF-NaOH respectively.
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