Russian Journal of Applied Chemistry, 2012, Vol. 85, No. 6, pp. 856−861.
Pleiades Publishing, Ltd., 2012.
Original Russian Text © A.I. Rat’ko, A.I. Ivanets, E.A. Voronets, 2012, published in Zhurnal Prikladnoi Khimii, 2012, Vol. 85, No. 6, pp. 863−869.
AND INDUSTRIAL INORGANIC CHEMISTRY
Copper-Magnesium Oxide Catalyst
Based on Modiﬁ ed Dolomite
A. I. Rat’ko, A. I. Ivanets, and E. A. Voronets
The Institute of General and Inorganic Chemistry, National Academy of Sciences of Belarus, Minsk, Belarus
Received August 19, 2011
Abstract—Novel highly active copper-magnesium oxide catalysts based on modiﬁ ed dolomite were synthesized.
They are of superior performance in comparison with catalyst materials (MTM, Birm, Pyrolox, MZHF) which are
widely used currently in puriﬁ cation of water from iron. The inﬂ uence of the nature of the copper precursor and
concentration of impregnation solutions on the activity and phase composition of catalysts was found.
The problem of puriﬁ cation of drinking water from
iron and manganese compounds is most effectively solved
at the present time using a variety of catalytically active
materials: MTM, Birm, Pyrolox, MZHF etc. High activ-
ity of these materials is ensured by a fact that in their
composition there are manganese oxides(III, IV) as a
catalytically active phases. Despite a signiﬁ cant number
of positive properties known catalytic systems have dis-
advantages. Mainly that is a relatively low range of their
effective catalytic action to ensure the oxidation of ferrous
iron to ferric up to value of MPC (0.3 mg L
) when the
content of ferrous iron in the source water is no more than
15–20 mg L
[1, 2]. For increasing the operational range
of catalysts in the region of high concentrations of ferrous
iron it should be developed new catalytic systems with
very high activity and structure, which will provide the
desired frequency and efﬁ ciency of collisions of particles
in catalysis, as well as removal of reaction products.
An analysis of published data and results of prelimi-
nary studies have shown that copper-magnesium oxide
systems met these requirements relative to the catalytic
activity [3–5]. Preliminary tests have shown a fairly high
efﬁ ciency of industrial co-deposited copper-magnesium
oxide catalyst in the catalytic puriﬁ cation of water from
ferrous iron. However, the low hydrolytic stability under
conditions of removal of iron compounds from the water
makes it impossible to use in practice.
In view of composition and structure of thermally
activated dolomite, which is granules of the chemical
, we suggested that based on
it the copper-magnesium catalyst can be synthesized,
which possesses the high catalytic activity due to the
modiﬁ ed dolomite basis and the necessary performance
characteristics: hydrolytic stability, mechanical strength,
low friction, etc.
The goal of the work is developing new catalytic
systems of oxidation of ferrous iron in water which en-
sure stable operation of catalysts at high concentrations
of ferrous iron (50 mg L
and above). Therefore, a new
method of the synthesis of highly active copper-magnetic
catalyst should be found based on the modiﬁ ed dolomite
as well as studied the effect of copper-containing precur-
sors on the chemical and phase composition and catalytic
activity of the catalyst, carried out comparative tests of
the catalysts obtained with both materials most widely
used at present for the catalytic puriﬁ cation of water from
the iron and industrial co-deposited copper-magnesium
Deposited copper-magnesium oxide catalysts (frac-
tion of 0.63–1.5mm) were obtained by soaking the
pre-thermally activated dolomite (deposits “Ruba,” the