ISSN 0036-0244, Russian Journal of Physical Chemistry A, 2017, Vol. 91, No. 1, pp. 26–29. © Pleiades Publishing, Ltd., 2017.
Original Russian Text © Yu.P. Semushina, S.I. Pechenyuk, L.F. Kuzmich, A.I. Knyazeva, 2017, published in Zhurnal Fizicheskoi Khimii, 2017, Vol. 91, No. 1, pp. 30–33.
CHEMICAL KINETICS
AND CATALYSIS
Relationship between the Catalytic Properties of the Products
of the Oxidative Thermolysis of Certain Complexes
and the Porous Structures of Samples in the Oxidation Reactions
of Volatile Organic Compounds
Yu. P. Semushina, S. I. Pechenyuk*, L. F. Kuzmich, and A. I. Knyazeva
Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials,
Russian Academy of Sciences, Kola Science Center, Apatity, 184209 Russia
*e-mail: pechenyuk@chemy.kolasc.net.ru
Received December 22, 2015
Abstracts—The rate of the gas-phase oxidation of ethanol, 2-propanol, acetone, ethyl acetate, dioxane, and
benzene with atmospheric oxygen is studied on surfaces of bimetallic oxide catalysts Co–Fe, Cu–Fe, Cr–
Co, and Ni–Fe, prepared via thermal decomposition of double complex compounds in air. It is found that
the rate of oxidation of volatile compounds depends on the volume of the transient pores in the catalyst sam-
ple. The rate of oxidation on the same catalyst at 350°C depends on the nature of the substance in the order:
acetone > ethyl acetate > ethanol > propanol > dioxane, benzene.
Keywords: volatile organic substances, thermolysis product of binary complex compounds, rate constant of
catalytic oxidation, transient pore volume
DOI: 10.1134/S003602441701023X
INTRODUCTION
tion rate constants of ethanol at 350°C. It was found
that the magnitude of the rate constants lay in the
range of (1–6.5) × 10−5 s−1, depending on the nature
of the catalyst and the gas flow rate. The results
obtained in [7] also forced us to give special attention
to the porous structure of catalyst samples.
Protecting the planet’s atmosphere from pollution
is a major problem that has long attracted the attention
of the scientific community [1]. Volatile organic com-
pounds (VOCs) from different industrial and domestic
sources occupy an important place among environ-
mental pollutants. The gas-phase catalytic oxidation
of VOCs has been recognized as one of the most effec-
tive ways of combating these pollutants [1–4]. The
catalysts used in these processes are noble metals
(NMs) supported on carriers and the oxides of such
transition metal as chromium, manganese, and cop-
per. Due to the high cost of NMs, the cheaper transi-
tion metals are receiving increased attention. It is
known that bimetallic catalysts based on the latter
exhibit better catalytic properties than monometallic
catalysts, and even than ones based on NMs [5, 6].
Being a simple molecule, ethanol is well suited for
model experiments to study surfaces and thus catalytic
oxidation reactions [2]. In [7], the catalytic properties
of the products of the thermolysis of double complex
compounds (DCCs) of metals of the first transition
series in air were studied in the reaction of ethanol oxi-
dation with atmospheric oxygen in a gas stream. The
product samples were classified according to compo-
sition, specific surface area, pH point of zero charge,
In this work, we continue our study to find a cor-
relation between the rate of oxidation of VOCs and the
porous structure of bimetallic oxides obtained via the
oxidative thermolysis of DCC. Five of the 13 samples
studied in [7], three of which displayed maximum
activity and two, minimum activity, in the oxidation of
ethanol at 350°C, were selected for more detailed
study. In addition, the dependence of the rate of etha-
nol oxidation on temperature was studied for three
samples. For all of the samples, the number of VOCs
was expanded to include isopropanol, acetone, ethyl
acetate, benzene, and dioxane. Here we studied one
possible reactions: the oxidation of VOCs to carbon
dioxide. In [4], it was shown that in the presence of
manganese oxides, ethyl acetate is completely oxi-
dized to CO2. Since dioxane is an isomer of ethyl ace-
tate С4Н8О2, it is interesting to compare the rate of
concentration of surface OH groups, and the oxida- oxidation of both isomers.
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