Comparative study of hydrofullerides C60Hx synthesized by direct and catalytic hydrogenation
- Conference date: 8-15 March 2003
- Location: Kirchberg, Tirol (AUSTRIA)
Hydrofullerides with hydrogen content up to 5 Wt.% were obtained by direct and catalytic reaction with H2 gas. Hydrogen content was monitored in situ using gravimetric system and verified by chemical analysis ex situ. It was found that pure C60 reacts rapidly when exposed to H2 gas at 673 K and 50–100 Bar. Gravimetric study of this reaction showed that hydrogenation is saturated at about 5 at.% of hydrogen. Mass of the sample goes through a maximum and with a longer reaction time its weight start to decrease. This proves that hydrofullerides with high hydrogen content are not stable and strong hydrogenation results in collapse of C60 molecules. XRD study showed that samples prepared by direct hydrogenation without catalyst retain an original FCC structure with increase of cell parameter up to a=15.1Å. Catalytic hydrogenation of C60 with H2 gas results in decrease of the reaction temperature and formation of hydrofullerides with new crystal structure (suggestively sc).
- Hydrogen reactions
- Crystal structure
- Chemical analysis
- X-ray diffraction
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