ISSN 1070-4272, Russian Journal of Applied Chemistry, 2016, Vol. 89, No. 3, pp. 354−359. © Pleiades Publishing, Ltd., 2016.
Original Russian Text © A.F. Dresvyannikov, M.E. Kolpakov, E.A. Ermolaeva,
2016, published in Zhurnal Prikladnoi Khimii, 2016, Vol. 89, No. 3, pp. 300−305.
INORGANIC SYNTHESIS AND INDUSTRIAL
Improvement of Synthesis Conditions of Dispersed Polymetallic
Fe–Al–Mo Systems in Aqueous Solutions
A. F. Dresvyannikov*, M. E. Kolpakov, and E. A. Ermolaeva
Kazan National Research Technological University, ul. Karla Marksa 68, Kazan, Tatarstan, 420015 Russia
Received March 9, 2016
Abstract—Kinetic dependences describing the processes occurring on aluminum microparticles in aqueous so-
lutions containing iron and molybdenum ions were determined. It was shown that the samples obtained contain
iron, molybdenum, and aluminum in the elementary state in the absence of an oxide phase.
Systems containing molybdenum and iron-group
metals attract researchers’ attention due to the high
catalytic activity of these systems in the hydrogen-
evolution reaction ; they are used as catalyst promoters
for several types of reactions in organic chemistry  and
possess increased wear  and corrosion resistance .
The evaporation-condensation and nanodispersion
of bulk materials are the most popular among physical
methods for obtaining metallic systems, and thermal and
ultrasonic decomposition of metal-containing organic
and inorganic compounds and reduction with gases,
among chemical methods . These methods require
intricate special-purpose equipment, and the product
obtained is inhomogeneous in composition and contains
in some cases a substantial amount of by-products and,
in particular, oxides and hydroxides .
More promising are chemical methods for synthesis
of polymetallic systems with high dispersity by joint
reduction of metal ions in solution. This makes it possible
to obtain structures of the type of substitution solid
solutions directly in the course of synthesis and to control
the shape of particles within the required range of sizes
by varying the synthesis conditions .
From the theoretical standpoint, the chemical synthesis
of systems containing iron and molybdenum is of interest
as an example of the so-called induced coprecipitation
. According to [7, 8], metallic molybdenum cannot be
electrochemically recovered in the individual state from
aqueous solutions, but it can be coprecipitated with metals
of the iron family to give an alloy .
Thus, experimental studies of the synthesis of dis-
persed systems based on iron and molybdenum and
analyses of their properties are topical for a number of
reasons. It should be noted that aluminum in the dispersed
state, the content of which in the precipitate can be eas-
ily varied by chemical methods , is one of effective
The goal of our study was to examine the conditions of
synthesis of Fe–Al–Mo polymetallic systems in aqueous
solutions with the use of dispersed aluminum.
The synthesis of the Fe–Al–Mo polymetallic system is
based on the process in which Fe(III) and Mo(IV) ions are
reduced on an aluminum substrate suspended in solution.
The study was carried out with solutions of reagents
of no less than analytically pure grade: FeCl
O, and C
, prepared with
twice-distilled water. Dispersed aluminum of ASD-0
brand (71-100 μm fraction) was taken as shipped. The
Al : (Fe + Mo) molar ratio in the reaction mixture was
1.5 : 1. The precipitate formed was separated by the
magnetic method from the mother liquor, washed with
twice-distilled water to neutral medium and with ethanol,
and dried in a vacuum at 60°C. The process kinetics
was examined by sampling the reaction mixture in