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King Abdulaziz University
Document Details
Document Type
Document Title
: Article In Conference
: Catalytic oxidation of propane on
nanostructure MoVTeNbO catalyst: influence
of the phase structure
Catalytic oxidation of propane on
nanostructure MoVTeNbO catalyst: influence
of the phase structure
Subject
Document
Language
Abstract
: ‫ءك يم يا‬
: English
: The one-step oxidation of propane into acrylic
acid over MoVTeNbO mixed oxide is one of
the recent challenges in selective oxidation
field and has attracted many research interests.
It has been claimed that two phases, called M1
and M2, having orthorhombic and pseudohexagonal structures, respectively, are
necessary for obtaining high catalytic
performance. However, due to the difference in
the preparation methods, significant
divergences are found in the literature when
comparing samples of the nominally identical
MoVTeNbO catalyst obtained by different
routes. For this reason, both the multi-phase
catalyst and the M1 phase-pure catalyst,
owning the same precursor, were successfully
prepared. In particular, M1 phase-pure catalyst
was obtained, for the fist time, by especial
reaction treatment (C3H8+air+stream) of the
multi-phase catalyst. In addition, aiming the
better understanding of the phase
transformation in the multi-phase MoVTeNbO
catalyst, M2 phase-pure catalyst was also
successfully prepared and treated under the
same conditions as the multi-phase
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MoVTeNbO catalyst. According to the XRD
pattern of the multi-phase MoVTeNbO catalyst,
it was found that two active phases, including
M1 and M2, and other minor impurity phases
were observed. Upon treated by reaction
mixture gas, however, it was observed that
reflections from M2 phase and other impurity
phases disappeared completely and M1 phasepure catalyst was obtained, indicating that M2
phase had lower reaction stability than M1
phase under the rigorous reaction atmosphere.
The XRD pattern of the pure M2 catalyst
further confirmed this assumption, in which it
could be found that M2 phase-pure catalyst was
metastable and easier to be transformed into
other phases after an especial reaction
treatment. The data from catalytic reactions
showed that the catalytic performance was
strongly dependent on the phase structure of the
catalyst. For the multi-phase MoVTeNbO
catalyst with active M1 and M2 phase, the
highest conversion of propane was achieved,
suggesting that the synergetic effect between
M1 and M2 phase was favorable to the
activation of the propane. On the other hand,
M1 phase-pure catalyst exhibited higher
selectivity to acrylic acid than the multi-phase
MoVTeNbO catalyst itself, especially, in which
the suppression of COx formation was
obviously observed. This means the formation
of acrylic acid is more favored on the pure M1
phase catalyst than on the multi-phase catalyst.
Considering that the highest yield of acrylic
acid close to 42% was achieved over M1 phasepure catalyst, it could be concluded that the
reaction-treatment of multi-phase MoVTeNbO
catalyst was an effective, successful method for
preparing M1 phase-pure catalyst, for which
more excellent catalytic performance was
obtained.
: 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
Publishing Year
Article Type
Added Date
: 1429 AH
2008 AD
: Article
: Tuesday, February 17, 2009
Researchers
Researcher Name Researcher Name Researcher
Dr
Email
(Arabic)
(English)
Type
Grade
Hongxin Wang
Hongxin Wang
Researcher Doctorate
Wenling Chu
Wenling Chu
Researcher Doctorate
Weishen Yang
Weishen Yang
Researcher Doctorate
Files
File Name
18432.pdf
Type
pdf
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