ISSN 1070-4272, Russian Journal of Applied Chemistry, 2007, Vol. 80, No. 8, pp. 1353!1359. + Pleiades Publishing, Ltd., 2007.
Original Russian Text + S.N. Tkachenko, E.Z. Golozman, V.V. Lunin, I.V. Kozlova, G.V. Egorova, E.A. Boevskaya, I.S. Tkachenko, A.I. Nechugovskii,
M.P. Yaroshenko, 2007, published in Zhurnal Prikladnoi Khimii, 2007, Vol. 80, No. 8, pp. 1314 !1320.
A Study of a Catalyst Based on Oxides of Base
Transition Metals for Decomposition of Ozone
and Oxidation of Toxic Organic Compounds
S. N. Tkachenko, E. Z. Golozman, V. V. Lunin, I. V. Kozlova, G. V. Egorova,
E. A. Boevskaya, I. S. Tkachenko, A. I. Nechugovskii, and M. P. Yaroshenko
Lomonosov State University, Moscow, Russia
Novomoskovsk Institute of Nitrogen Industry, Open Joint-Stock Company, Novomoskovsk,
Tula oblast, Russia
TIMIS Research-and-Promotion Firm, Limited Liability Company, Moscow, Russia
Received August 29, 2006; in final form, March 2007
Abstract-Cement-containing GTT catalysts based on manganese, copper, and nickel oxides were developed
and introduced into practice in processes employing ozone technologies and in oxidation of toxic organic
compounds. Physicochemical methods were used to study the process of catalyst formation and the influence
exerted by various brands of manganese salts and by preparation conditions and, in particular, calcination
temperatures and grain molding technique on the characteristics of the catalytic systems obtained. Several
commercial batches of GTT catalysts were manufactured.
At present, one of the most efficient and ecolog-
ically safe ways to purify drinking water, wastewater,
and water in swimming pools is ozonation. The use of
ozone is due to its oxidizing and bactericidal prop-
erties; however, the acrid smell and toxicity of ozone
(MPC = 3.3 mgm
) makes topical the problem of
destruction of residual ozone . Photochemical, ther-
mal, and catalytic methods of ozone decomposition
are possible. The optimal in economical efficiency
and simplicity of technological apparatus is the cat-
alytic decomposition of ozone .
The industrially employed catalyst for ozone de-
composition, hopcalite, is composed of 60% manga-
nese oxide, 25% copper oxide, and 15% binder (ben-
tonite clay). It has an important disadvantage, poor
mechanical strength, to the point of grain disintegra-
tion under the action of moisture drops . The known
catalysts , distinguished by stability and operation
N.I. Murashov, Zh.V. Myasnikova, S.G. Dormidontova, and
L.D. Kvasova took part in catalyst preparation on laboratory,
pilot, and industrial installations, and also in catalytic activity
tests and determination of other characteristics of catalysts.
efficiency under humid conditions, contain noble me-
tals and, in particular, silver and are rather expensive.
Catalysts composed of oxides of nonprecious tran-
sition metals and exhibiting stable operation under
various conditions have been created by developing
cement-containing catalysts of GTT and GT brands,
based on manganese, copper, and nickel oxides .
The activity of these catalysts in a dry flow is close
to that of hopcalite and exceeds it by a factor of 1.532
in operation in a humid flow. These catalytic systems
have high mechanical strength and water resistance,
and their grains preserve shape when brought in con-
tact with water. In a dry gas flow, the catalysts work
at room temperature. In a humid flow, the working
temperature range is 203120oC. In case of a decrease
in activity in a corrosive humid medium, the catalysts
can be regenerated at 2503300oCin233h.
Tests demonstrated that GTT is efficient not only
in ozone decomposition, but also in oxidation of
carbon monoxide, methane, benzene, styrene, iso-
propylbenzene, butyl acetate, and other compounds.
The GTT catalyst possesses the necessary developed
surface, thermal stability, and resistance to coking in