II International Symposium on Carbon for Catalysis ABSTRACTS

PP-I-19
SOME REGULARITIES OF THE PREPARATION OF N-CONTAINING
CATALYTIC FILAMENTOUS CARBON BY PYRIDINE DECOMPOSITION
Ilinich G.N., Romanenko A.V., Salanov A.N., Titkov A.I., Likholobov V.A. 1
Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia
1 Institute of Hydrocarbons Processing SB RAS, Omsk, Russia
e-mail: ig@catalysis.nsk.su
Nitrogen containing catalytic filamentous carbons (N-CFCs) is a new type of carbon
materials. N-CFCs have great importance, primarily, as promising catalyst supports. The
synthesis of these carbons with the predetermined properties is complex process because of
variety of reactions occurring in the gas phase, on the catalyst surface and on the newborn
N-CFC filament itself. In this work we revealed some factors defining the yield, texture and
chemical composition of the N-CFCs prepared by deposition of gaseous mixtures of pyridine
(C 5 H 5 N, Py) with H 2 or Ar over NiCu/Al 2 O 3 catalyst (Ni - 64 wt %, Cu – 4 wt %) at
550-800 o C [1, 2].
Table data show the Py decomposition in the presence of H 2 at 750 o C provides the
maximum N-CFC yield (sample № 4). In case of Py/Ar the yield of carbon decreases more
than by an order (sample № 6).
Reaction conditions 1)
N-CFC
№ Т, о С
mixture 2)
yield,
Time, h
composition 3) Oligomers
g/g (Ni+Cu)
1 550 Ру/Н 2 4,50 33 NC 104 H 13 -
2 650 4,50 42 NC 56 H 6 -
3 700 4,50 50 NC 46 H 5 -
4 750 4,50 73 NC (32-38) H 3 +
5 800 2,25 26 NC 33 H 0,7 ++
6 750 Py/Ar 4,50 5 NC 18 H 1,4 -
1) 0.05 g of the catalyst, atmospheric pressure and flow rate of mixture ~ 6 l/h; 2) [Py] = 10 %, mol; 3) elemental
analysis data.
We have concluded that the stage of Py hydrodenitrification (HDN) catalyzed by Ni
precedes the N-CFC formation in Ру/H 2 mixture. The carbon fragments are formed by
decomposition of HDN products, supposedly of C 5 -hydrocarbons. As a consequence, such
carbons have a lower content of nitrogen in comparison with N-CFC, prepared of Py/Ar
mixtures. High catalyst activity in N-CFC formation is explained by lower binding energies in
the molecules of C 5 -hydrocarbons in comparison with the ones in molecule of pyridine itself.
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