II International Symposium on Carbon for Catalysis ABSTRACTS

PP-I-19
Electron-microscopic studies testify that the filaments of different morphological types
were formed from Py/H 2 and Py/Ar mixtures [2]. The filaments have a diameter from 30 to
180 nm (Fig. 1). Intertwining in chaotic way, the thinner filaments form fascicles of thicker
fibers. In the samples prepared from Py/H 2 the diameter of such fibers reaches 0,5 μm.
Fig.1. REM-pictures of the samples prepared from Py/Ar (A) and Py/H 2 (B) mixtures at
750 o C.
One should note, oligomers were formed as products of uncatalyzed reactions at hightemperature
decomposition of pyridine in the presence of Н 2 (Table). Their pyrolysis leads to
formation of disordered carbon. This material accumulates in the structure of the growing
A BET
, m 2 g -1
350
300
250
200
150
100
50
0
2
1
550 600 650 700 750 800
Temperature, o C
Fig.2. Specific surface area of N-CFC versus the
temperature of Py/H 2 decomposition. Time
of decomposition: 2,25 h (curve 1), 4,50 h
(curve 2).
fibers and decreases the values both
V Σ and А BET and influences the
surface N/C atomic ratio. Also it can
block the active centers of catalyst,
leading to its deactivation.
We have selected the
temperature interval of Py
decomposition predominantly via the
catalytic route. The close values of
А BET , about 300+/-50 m 2 /g (Fig. 2),
and TEM data show that mainly
CFC is formed at 550-700 о С.
References
[1] Ilinich G. N., Likholobov V. A. Rus. Pat. 2147925 (2000).
[2] Ilinich G. N., Romanenko A.V., Kvon R.I., Fenelonov V.B., Zaikovsky V.I.,
Ishchenko A.V.// Kinet. and Catal. (Russian) in press.
157