ISSN 1070-4272, Russian Journal of Applied Chemistry, 2008, Vol. 81, No. 10, pp. 1764–1767. © Pleiades Publishing, Ltd., 2008.
Original Russian Text © S.G. Khaminets, L.L. Potapova, V.Z. Radkevich, Yu.G. Egiazarov, 2008, published in Zhurnal Prikladnoi Khimii, 2008, Vol. 81,
No. 10, pp. 1639–1642.
Supported Metal Catalysts Based on Fibrous Carbon Material
for Low-Temperature CO Oxidation
S. G. Khaminets, L. L. Potapova, V. Z. Radkevich, and Yu. G. Egiazarov
Institute of Physicoorganic Chemistry, National Academy of Sciences of Belarus, Minsk, Belarus
Received January 22, 2008
Abstract—A number of supported-metal (Pt, Pd) catalysts based on Karbopon nonwoven carbon fibers were
prepared by deposition from hydrosols and by ion exchange. The catalytic activity of the catalysts in low-
temperature oxidation of carbon monoxide by atmospheric oxygen was determined. Catalyst samples were
studied by transmission electron microscopy.
Purification of air to remove carbon monoxide is
an important ecological problem. The only efficient
way to remove carbon monoxide from air is catalytic
oxidation, and, therefore, extensive studies aimed to
develop active catalysts for CO oxidation have been
carried out in recent years.
The first practically used low-temperature catalyst
for CO oxidation is hopcalite (mixture of copper and
manganese oxides). Until recently, catalytic systems of
this kind, based on transition metal oxides, have been
studied and patented [1–3]. These catalysts are inex-
pensive and readily available, but rapidly loose activity
in the presence of moisture.
Noble metals supported by thermally stable and
chemically inert oxides (Al
) catalyze CO oxi-
dation only at temperatures above 150°C, because,
being firmly sorbed on the metal surface at low tem-
peratures, CO hinders adsorption of oxygen [4, 5].
Catalytic systems in the form of a noble metal
supported by a reducible oxide (SnO
can work at low temperatures [6–10] and are more
stable in a humid atmosphere than hopcalite. It is
believed  that a noble metal makes lower the strength
of the M–O bond in the oxide substrate, i.e., it cata-
lyzes the reduction and reoxidation of the oxide. This
generates active oxygen for the reaction of CO oxida-
Because the efficiency of supported-metal cata-
lysts is largely determined by the physicochemical
properties of a support, the increasing interest in new
types of supports is justified. In particular, a consider-
able attention has been given recently to carbon mate-
rials with fibrous structure. Owing to the electrical
conductivity of the carbon support, the supported metal
is not electron-deficient, in contrast to the case of sup-
ports of acid nature.
Previously, a number of mono- and bimetallic
supported-metal catalysts based on Karbopon non-
woven carbon fibers have been synthesized and stud-
ied in the reaction of CO oxidation . The catalysts
were prepared by impregnation with aqueous solutions
of metal salts, followed by heating and reduction. A
conclusion was made that platinum-containing cata-
lysts are the most promising for CO oxidation.
Supported-metal catalysts fabricated by the con-
ventional impregnation method have an insufficiently
high activity in CO oxidation. Therefore, it was neces-
sary to find a way to obtain a more active catalyst.
The aim of our study was to develop a method for
fabrication of an efficient catalyst for low-temperature
oxidation of carbon monoxide in the form of a noble
metal supported by carbon fibers.
OF SYSTEMS AND PROCESSES
We prepared the catalyst from Karbopon carbon
fibrous material manufactured by Khimvolokno Pro-
duction Association (Svetlogorsk, Belarus). The mate-