II International Symposium on Carbon for Catalysis ABSTRACTS

PP-I-20
time on stream increased from 1 to 20 h and graphitic nitrogen became the main state in
N-CNF produced after 20 h.
Prepared N-containing CNF are the graphitic mesoporous materials as confirmed by
XRD, XPS, TEM and N 2 adsorption methods. The surface area varies within the interval of
30 – 350 m 2 /g, while the pore size between 5 – 19 nm, depending on the synthesis conditions
(Fig. 1). Correlation between the values of surface area and interlayer distance d 002 in the
course of reaction time was observed: maximum BET area of N-CNF with minimum d 002
were attained at 1 – 2 h. TEM studies showed that formation of helical nanofibers with
diameter ranges between 60 and 100 nm takes place during the decomposition of C 2 H 4 /NH 3
mixtures over Ni-Cu-Al 2 O 3 catalyst (Fig. 2). Nanofibers have a ‘herringbone’ structure with
graphite layers arranged at an angle of 45 – 75° to fiber axis.
Surface area (BET), m 2 /g
280
240
200
160
120
80
40
550 о С
600 о С
625 о С
650 о С
0
0 2 4 6 8 10 12 14 16 18 20
Reaction time, h
Fig. 1. Dependence of surface area of N-CNF
on time on stream for the decomposition of
75%C 2 H 4 /25%NH 3 mixture on Ni-Cu-Al 2 O 3
catalyst at different temperatures.
Fig. 2. TEM image of N-CNF grown after
1 h decomposition of 75%C 2 H 4 /25%NH 3
mixture on Ni-Cu-Al 2 O 3 catalyst.
Thus, method of synthesis of nitrogen-containing carbon nanofibers by decomposition of
C 2 H 4 /NH 3 gas mixture on metal catalysts was developed. Influence of the reaction conditions
on the nitrogen content and properties of N-CNF were studied. Carbon nanofibers with
nitrogen content up to 8 wt. % were prepared. In more detail the experimental results and
discussion will be presented in full paper.
Acknowledgements
This work has been carried out in the framework of NEDO Project “Development of
high-performance N-doped carbon materials for non-platinum PEFC electrocatalysts”.
References
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