ISSN 1070-4272, Russian Journal of Applied Chemistry, 2016, Vol. 89, No. 11, pp. 1786−1790. © Pleiades Publishing, Ltd., 2016.
Original Russian Text © V.M. Bondareva, A.N. Chernov, E.V. Ishchenko, V.I. Sobolev,
2016, published in Zhurnal Prikladnoi Khimii, 2016, Vol. 89, No. 11,
Effect of Pressure on the Oxidative Conversion
of Ethane on VMoTeNbO Catalyst
V. M. Bondareva
*, A. N. Chernov
, E. V. Ishchenko
, and V. I. Sobolev
Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences,
pr. Akademika Lavrent’eva 5, Novosibirsk, 630090 Russia
Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090 Russia
Received November 3, 2016
Abstract—Study of the catalytic properties of the VMoTeNbO catalyst in the oxidative conversion of ethane to
ethylene at pressures of 0.1 to 2.1 MPa demonstrated that the pressure positively affects the conversion of ethane
and favors formation of oxygen -containing products of deep and partial oxidation: carbon oxides and acetic
acid, respectively. With increasing pressure, the yield of the product of oxidative dehydrogenation of ethane, i.e.,
Together with temperature, pressure is an important
factors that affect the rate of gas-phase chemical reactions.
This is primarily due to the fact that an increase in
pressure affects the concentration of gaseous reagents
and, consequently, their interaction rate become higher.
For irreversible reactions and reactions occurring far
from equilibrium, the rate is proportional to pressure
in a power equal to the reaction order. Therefore,
pressure most strongly intensiﬁ es high-order reactions.
In reversible processes, pressure can, in addition to
affecting the concentration, shift the chemical equilibrium
in accordance with the Le Chatelier principle. If several
products are formed in the course of a reaction, pressure
can strongly accelerate consecutive or parallel reactions
that are exceedingly slow at low pressures. As a result,
the products may include substances in concentrations
substantially exceeding those formed by the same
reactions at low pressures.
It was noted in communications [1, 2] summarizing the
published data on the homogeneous partial oxidation of
methane and its C
homologs that pressure is the main
factor affecting the formation, composition, and content
of liquid reaction products, alcohols, aldehydes, and acids.
It was found  in a study of the process of oxidation
(combustion) of C
alkane isomers as components
of various kinds of fuels that raising the total pressure of
the reaction mixture not only makes shorter the ignition
delay, i.e., raises the reaction rate, but also affects the
relative contents of reaction products. Another example
of how pressure affects the composition of products is
presented by the processes of cracking and reforming of
hydrocarbon raw material .
In addition, pressure can exert influence on the
physicochemical characteristics of components of a
reaction mixture and, for reactions occurring in the
presence of a catalyst, also on adsorption–desorption
processes. For example, the diffusion coefficient is
inversely proportional to pressure at pressures of up
to 2 MPa . It has been found that the acceleration
of the reaction of low-temperature oxidation of ethane
with hydrogen peroxide in the presence of Fe- and Cu-
containing ZSM-5 zeolites, observed as the pressure of
a gas mixture containing 10% ethane in argon is raised,
is due to the increase in the ethane/H2O ratio as a result
of the increase in the solubility of ethane.
The heterogeneous catalytic oxidative conversion of
ethane is a complex process where various reactions may
occur simultaneously: oxidative dehydrogenation (ODE)
to give ethylene, partial and deep oxidation yielding
oxygen-containing products, acetaldehyde and(or) acetic
acid and carbon oxides, respectively. In this case, pressure
will affect the selectivity by determining the rate of partial
reactions and, in the end, the yield of separate products.
Kinetic studies of the oxidative conversion of ethane into