ISSN 1070-4272, Russian Journal of Applied Chemistry, 2017, Vol. 90, No. 2, pp. 225−235. © Pleiades Publishing, Ltd., 2017.
Original Russian Text © V.Z. Radkevich, S.G. Khaminets, O.A. Samoilenko, I.G. Paplevko, I.P. Prosvirin, A.A. Dubkov, L.N. Grishchenko,
2017, published in
Zhurnal Prikladnoi Khimii, 2017, Vol. 90, No. 2, pp. 203−214.
OF SYSTEMS AND PROCESSES
Inﬂ uence of the Surface Functionalization Conditions
on the Properties of Carbon Fibers and Supp orted Palladium
V. Z. Radkevich
*, S. G. Khaminets
, O. A. Samoilenko
, I. G. Paplevko
, I. P. Prosvirin
A. A. Dubkov
, and L. N. Grishchenko
Institute of Physical Organic Chemistry, National Academy of Sciences of Belarus, ul. Surganova 13, Minsk, 220072 Belarus
Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences,
pr. Akademika Lavrentʼeva 5, Novosibirsk, 630090 Russia
Taras Shevchenko National University, vul. Volodimirska 60, Kyiv, 01033 Ukraine
Received December 16, 2016
Abstract—The inﬂ uence exerted by the conditions of oxidation and calcination in an inert medium on the proper-
ties of Karbopon and Busoﬁ t activated carbon ﬁ bers were studied using a set of physicochemical methods. The
maximal concentration of thermally stable phenol groups in Busoﬁ t is reached by its oxidation with a 20% aque-
solution, followed by calcination in an inert medium at 500°С for 1.5 h. Experiments with catalysts
supported on Busoﬁ t samples functionalized with 20% HNO
have shown that palladium supported on Busoﬁ t
that was calcined at 500°C after oxidative treatment is characterized by monodisperse nanocluster distribution.
The prepared catalysts containing 1 wt % Pd exhibit higher activity in oxidation of carbon monoxide than their
presently known analogs do.
Depending on the nature of the starting material and
on the synthesis conditions, carbon materials exhibit
diverse surface chemistry. Their surface can have both
hydrophilic and hydrophobic sites and can bear various
acidic and neutral oxygen-containing functional groups:
carboxy, phenol, carbonyl, quinone, lactone, ether, and
ester groups, as well as basic groups such as pyrone
rings and sites with increased π-electron density, capable
of protonation under the action of strong acids . The
functional composition can be relatively readily varied
by appropriate redox treatments.
Surface modiﬁ cation of carbon materials by
introducing an additional amount of acidic oxygen-
containing groups opens broad possibilities for designing
composite materials with unique physicochemical
properties. Carbon ﬁ bers are of much interest as an
object for these purposes.
Fibrous carbon materials have a number of
advantages over traditional granulated inorganic and
carbon supports. Because of small ﬁ ber diameter (5–
10 μm, which is smaller by approximately 2 orders of
magnitude than the granule diameter), ﬁ brous materials
are characterized by higher adsorption–desorption rate
and, as a consequence, by higher rate of attainment of
thermodynamic equilibrium in reactions involving them.
Fibrous structure of carbon materials allows preparation
of adsorbents with a wide range of physical forms
(tangled threads, nonwoven items, felt, fabric, and other
materials), ensuring diversity of implementations of the
corresponding gas treatment processes.
The reported procedures for preparing Pd-containing
catalysts based on carbon materials include, as a rule,
oxidative pretreatment of the support with such reagents
, air, etc. [2–5].
The oxidative treatment as a step in preparation of
metal-containing catalysts is aimed at forming acidic
ion-exchange groups ﬁ xing the metal component on
the carbon surface and preventing its migration over