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Document Details
Document Type
Document Title
: Article In Conference
: Synthesis and morphology of ZnO/MgO
catalysts prepared by deposition of preformed
colloidal ZnO nanoparticles
Synthesis and morphology of ZnO/MgO
catalysts prepared by deposition of preformed
colloidal ZnO nanoparticles
Subject
Document
Language
Abstract
: ‫ءك يم يا‬
: English
: Nanometer sized ZnO particles are attracting
the much interest not only in fundamental
researches but also in practical application.
ZnO has important application potential owing
to its diverse superior properties. For example,
ZnO nanoparticles with controllable dimension
and morphology may be perspective for the
fabrication of supported catalysts either as
support, active component, promoter or as
structural and textural modifier etc. There are
many various methods of chemical synthesis
for preparation of the ZnO containing
nanostructures. But the most of them are
laborious and expensive. We proposed a
relatively simple method for preparation of
ZnO/MgO catalyst with constant chemical
composition (ca. 1 wt. % ZnO) and controlled
size of active component. The developed
approach is based on deposition of previously
formed zinc oxide nanoparticles from colloidal
solution without surfactant on magnesia. The
ZnO nanoparticles colloid was obtained by
mixing of 2-propanol solutions of zinc acetate
and sodium hydroxide. The synthesis of
ZnO/MgO solid was carried out by mixing of
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ZnO colloidal solution with magnesia
suspension in 2-propanol followed by filtration,
washing, drying and calcination. The size of
ZnO nanoparticles is controlled by conditions
of their growth in colloidal solution:
concentration of initial reagents, pH value,
temperature and time of aging. The
morphology of obtained products was
characterized by transmission electron
microscopy (TEM). The size distribution of
ZnO nanoparticles in colloidal solutions and
ZnO/MgO solids were determined from data of
TEM and UV-Vis absorption and diffuse
reflectance spectroscopy. A good agreement
between the average radius and the particle size
distribution of the ZnO nanoparticles obtained
by both methods has been found. The
ZnO/MgO solids with different size of ZnO
nanoparticles (3-7 nm in diameter) were
synthesized by varying the conditions of ZnO
nanoparticles growth in colloidal suspension.
The catalytic properties of prepared ZnO/MgO
solids were tested in the CO oxidation reaction
by a flow method (2 % CO, 20 % O2, 78 % He,
flow rate 100 cm3/min). It was found that the
increasing of ZnO nanoparticles size leads to
nonmonotonic change of their catalytic activity.
The ZnO/MgO solid containing ZnO particles
with average radius about 2.20 nm has
maximum activity in CO oxidation reaction.
: Tenth International Symposium on
Heterogeneous Catalysis
: From : 22/8/1429 AH - To : 26/8/1429 AH
From : 23/8/2008 AD - To : 27/8/2008 AD
: 1429 AH
2008 AD
: Article
: Wednesday, February 11, 2009
Researchers
Researcher Name Researcher Name Researcher
Dr
Email
(Arabic)
(English)
Type
Grade
Peter E. Strizhak
Peter E. Strizhak Researcher Doctorate
Olga Z. Didenko
Olga Z. Didenko Researcher Doctorate
Gulnara R.
Gulnara R.
Researcher Doctorate
Kosmambetova
Kosmambetova
Files
File Name
18237.pdf
Type
pdf
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