Russian Journal of Applied Chemistry, 2010, Vol. 83, No. 6, pp. 1154−1158.
Pleiades Publishing, Ltd., 2010.
Original Russian Text
T.P. Gaidei, N. Pillet, V.N. Sadov, M.E. Strukova, S.M. Filatov, E.S. Khaustova, N.T. Yaroshenko, 2010, published in Khimicheskaya
Promyshlennost’, 2010, Vol. 87, No. 2, pp. 104−108.
TECHNOLOGY OF ORGANIC
AND INORGANIC CHEMISTRY
The Activity of Cobalt Aluminum Catalyst
in Reaction of Nitrous Oxide Decomposition
T. P. Gaidei
, N. Pillet
, V. N. Sadov
, M. E. Strukova
, S. M. Filatov
E. S. Khaustova
, and N. T. Yaroshenko
Russian Scientiﬁ c Center “Applied chemistry”, St. Petersburg, Russia
National Center of Space Investigations (CNES), Toulouse, France
Received January 13, 2010
Abstract—Data of activity of cobalt aluminum catalysts with various content of active component in reaction of
nitrous oxide decomposition obtained both on laboratory equipment and model catalytic reactor are presented.
It was shown before that rhodium is one of the
most active components in reaction of decomposition
of nitrous oxide [1–3]. In connection with the fact
that rhodium is extremely rare and expensive metal,
the search for catalysts on the basis of more frequent
active components becomes an urgent task. One of
these promising single component catalysts in reaction
of decomposition of nitrous oxide is cobalt aluminum
catalyst [1–4]. In this work results are presented of the
investigation of its activity depending on concentration
and testing conditions including catalytic reactor,
modeling the work of the catalyst in possible real
conditions of application.
Preparation of samples. Investigations were
carried out on granular cobalt catalysts of applied type.
Catalysts were prepared by the method of repeated
saturation of aluminum oxide carrier brand SND which
was used before for the preparation of other catalysts for
this process [1, 2].
The solution of Co(NO
was used as initial salt of
active component (AC). The content of AC in catalysts was
varied from 5 to 30%. The thermal treatment of carriers
after saturation (introduction of salt of active component)
was implemented at 300–350°C. Characteristics of
prepared catalysts are given in Table 1.
To estimate the efﬁ ciency of catalysts two
preassembled samples of catalyst with composition of
26 and 30% of Со/(γ + θ + α)-Al
were prepared in
All samples were subjected to the thermal treatment
with air at 600 °C over 3 hours before they were tested.
X-ray phase analysis showed (Table 2) that all initial
catalysts contain cobalt oxide Со
and insigniﬁ cant
amount (traces) of aluminum spinel CoAl
carrier (γ + θ + α)-Al
Evaluation of activity in laboratory conditions.
The activity of catalysts was determined on apparatus
of ﬂ ow type. of catalyst granules of size 0.8–1.25
mm (30 cm
) were loaded into reactor. The activity
of catalysts was estimated according to temperature of
the beginning of decomposition (T
), when the degree
of decomposition was 2–5%, to temperature of 100%
decomposition, and by the value of the rate constant.
On the basis of obtained data the degree of
decomposition of N
O was calculated depending
on temperature ﬁ tting the ﬁ rst order equation;
kinetic characteristics were estimated till degree of
decomposition of N
O of 0.3: activation energy (E),
exponential factor (K
), and the rate constant (K)
corresponding to the temperature 420°C. The detailed
procedure of the investigation was described in [1–2].
Estimation of efﬁ ciency of catalysts in model
reactor . Tests were carried out in catalytic reactor