Structural, Chemical, and Dynamic Characteristics
of Ceramic Membranes Modified
with Self-organized Supramolecular Silicon Oxide Systems
A. V. Kuzema, A. A. Malygin, M. M. Ermilova,
N. V. Orekhova, N. L. Basov, and G. F. Tereshchenko
St. Petersburg State Technological University, St. Petersburg, Russia
Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Moscow, Russia
Received January 14, 2009
Abstract―The changes in structural characteristics, chemical composition, and gas permeability of the
modified ceramic asymmetric tubular membranes were studied. The membranes were tested in permeability
and selectivity of two gaseous mixtures (H/He and H/Ar). The structure of the modified coating was examined
by X-ray powder diffraction and by transmission and scanning electron microscopies.
OF SYSTEMS AND PROCESSES
ISSN 1070-4272, Russian Journal of Applied Chemistry, 2009, Vol. 82, No. 3, pp. 378–386. © Pleiades Publishing, Ltd., 2009.
Original Russian Text © A.V. Kuzema, A.A. Malygin, M.M. Ermilova, N.V. Orekhova, N.L. Basov, G.F. Tereshchenko, 2009, published in Zhurnal Prikladnoi
Khimii, 2009, Vol. 82, No. 3, pp. 386–394.
Ceramic membranes (CMs) have found growing
application in a variety of processes such as catalysis,
sorption, separation, and filtration [1–7]. The
important advantage of CMs is their thermal and
chemical stability at relatively low cost, simplicity of
recovery at enhanced temperatures, and high
At the same time, owing to the specific features of
the synthesis, CMs have low specific surface area (in
comparison, for example, with microporous zeolite
membranes) and are characterized by the nonuniform
size distribution of transporting pores.
The various modification methods of pore filling
(sol-gel procedure, chemical vapor deposition, and
molecular layering [2, 6, 8, 10]) are used to optimize
the CM structure.
Another method of the modification of wide pore
ceramic membranes is synthesis on their surface or
inside their pore volume of zeolite films [1,2].
However, such structures are brittle and labor-con-
suming in preparation.
Coating of CM surface with mesoporous thin silica
films is also the promising modification method. The
film synthesis is based on the procedures of structural
self-organization (SSO), which is a spontaneous
organization of materials via non-covalent interactions
(hydrogen bonds, van der Waals and electrostatic
forces, etc. ) occurring without application of
external forces. In this case, it is possible to realize the
narrow pore-size distribution and control it by varying
the synthesis conditions.
Silicon-containing structures have high chemical
and thermal stability, can be easily formed by the
above method, and their films have high adhesion to
the surface of oxide ceramics. Therefore, the goal of
this study was to synthesize the silica films with
desired properties on the surface of alumina-based CM
and to study the effect exerted by them on the structure
and permeability of the porous support.
Planar mesoporous thin films were deposited onto
the standard 50×25-mm slides of 2-mm thickness. As
initial CMs were used asymmetric porous ceramic
tubes made of α-Al
(outer diameter from 5.5 to
7.3 mm, wall thickness 1.1–1.3 mm) with a sol-gel
layer (thickness about 100 μm, mean pore diameter
50 nm) on their outer surface.