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King Abdulaziz University
Document Details
Document Type
Document Title
: Article In Conference
: The catalytic characterization of ZrO2-La2O3
mixed oxide
The catalytic characterization of ZrO2-La2O3
mixed oxide
Subject
Document
Language
Abstract
: ‫ءك يم يا‬
: English
: Physicochemical properties of ZrO2-La2O3
mixed oxides, prepared by two methods i.e.
precipitation and impregnation at different
La3+/Zr4+ molar ratios, were investigated. The
La3+/Zr4+ molar ratios of the precipitating
preparation were varied at 25:75, 50:50 and
75:25 namely as PxLa-ZrO2 of which x is
number of La3+ percentage. In case of
impregnation, only two different La3+/Zr4+
molar ratios were chosen at 25:75 and 50:50
because of a limitation of as-synthesized
zirconium hydroxide pore volume and the
synthesized oxide was named as IxLa-ZrO2.
The mixed oxide was characterized by means
of X-ray diffraction, Brunauer-Emmett-Teller,
NH3 temperature programmed desorption, CO2
temperature programmed desorption and
Differential Scanning Calorimeter (DSC) in
comparison with results of pure ZrO2 and pure
La2O3. The results indicated that amount of
La3+ and the preparation methods have an
effect on specific surface areas, phases, phase
transformation and the number of acid and base
sites and their strengths. P25La-ZrO2 and pure
ZrO2 contained mixed phases of monoclinic
and tetragonal. Amorphous mixed oxides were
obtained with additional La3+ content higher
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than 25% and I25La-ZrO2 exhibited only
tetragonal phase. Surface areas of precipitated
oxide distinctly decreased ~60-90% compared
to the pure oxide. Acid and base properties of
the mixed oxide were measured by means of
NH3 and CO2 TPD, respectively. The mixed
oxide possessed the number of acid and base
sites higher than those of pure ZrO2 at ~2070%. Their acidic and basic desorption
temperatures were increased to 380-450 ºC and
400-500ºC, respectively. It may conclude that
acid and base strengths of the mixed oxide were
in range of pure ZrO2 and pure La2O3
strengths
: 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
: Tuesday, February 17, 2009
Researchers
Researcher Name Researcher Name Researcher
Dr
Email
(Arabic)
(English)
Type
Grade
S. Soisuwan
S. Soisuwan
Researcher Doctorate
K. Jiradechkhajorn K. Jiradechkhajorn Researcher Doctorate
S. Prawong
S. Prawong
Researcher Doctorate
Piyasan
Piyasan
Researcher Doctorate
Praserthdam
Praserthdam
Files
File Name
18430.pdf
Type
pdf
Description
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