II International Symposium on Carbon for Catalysis ABSTRACTS

PP-I-36
MODIFICATION OF THE SURFACE OF CARBON MATERIALS BY
OZONIZATION
Semenova S.A., Patrakov Yu.F.
Institute of Coal and Coal Chemistry, Siberian Branch of RAS, Kemerovo, Russia
e-mail: chem@kemnet.ru
One of effective methods of oxidizing modification of carbon materials (СM) is
ozonization. This method essentially changes a reactionary surface of CM due to formation of
oxygen-containing functional groups (OFG). Advantage of gas-phase of ozonization against
other strong oxidizers is absence of expensive catalysts and harmful fluid wastes.
The purpose of the work is the research of the effect of ozonization on change of function
composition and sorption properties of CM of the various natures.
Treatment of CM is carried out in current ozone-oxygen mixtures (1-1,5 % of ozone) in a
rotating reactor at 25 o С. Objects of research are two CM of a natural origin - anthracite (A)
and fusains coal of mark D (FD) Kuznetsk coal basin and active carbon (AC) marks
AG-OV-1 (Ltd “Sorbent", Perm).
The characteristic of samples:
Element composition, Function composition, Adsorpti
Ash, % on daf
mg- eq/g
on on S BET *,
Sample
A d , %
iodine, m 2 /g
C H O+N+S -COOH -OH >CO
%
AС 33,6 95,2 0,5 4,3 - 0,28 2,29 63,2 690
FD 9,8 91,4 3,0 5,6 - 0,89 0,62 11,5 120
A 4,6 95,0 3,9 3,9 - 0,15 0,12 4,1 2
* The literary data
Ozonization of CM is accompanied by increase of the contents of oxygen and reduction
of carbon. Amount of carboxylic and phenolic groups increases in all samples. The contents
of carbonyl groups (fig. 1) changes through maximum, that is possible as a result of their
secondary oxidation. Ozonization has the greatest influence on СМ with the advanced
specific surface - AC and FD. It can be connected with both the facilitated diffusion of ozone
in volume of particles and catalytic action of mineral ingredients of CM.
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