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Document Details
Document Type
Document Title
: Article In Conference
: Hierarchically mesoporous-macroporous
titanium oxide supported nanosized ruthenium
oxide particles for styrene epoxidation with
H2O2
Hierarchically mesoporous-macroporous
titanium oxide supported nanosized ruthenium
oxide particles for styrene epoxidation with
H2O2
Subject
Document
Language
Abstract
: ‫ءك يم يا‬
: English
: After mesoporous TiO2 was first synthesized
by a sol-gel process with phosphorous
surfactants as templates by Antonelli and Ying
[1], various methods of surfactant templating
have been developed for the preparation of
mesoporous structures of TiO2 [2-4]. Since
mesoporous materials normally possess large
surface area and narrow pore size distribution,
which makes them a versatile candidate in the
catalysis field. It is generally anticipated that
the use of a high surface area mesoporous oxide
support rather than a commercial support for
transition metals has some beneficial effects on
the catalytic performance. The mesoporous
support would give rise to well dispersed and
stable metal particle on the surface upon
calcination and reduction and as a consequence
would show an improved catalytic performance
[5]. In this presentation, we use a relatively
easy way to synthesize mesomacroporous TiO2
at low-temperature without using any
templates, and then to prepare meso-macropous
TiO2 supported PVP-protected ruthenium
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oxide nanoparticle catalysts. The prepared
catalysts were characterized by the techniques
of SEM, TEM, XRD and XPS. It is revealed
from the XRD patterns that the materials
exhibited the pure anatase crystal structure, and
the diffraction peaks corresponding to RuO2
could not be observed, probably due to the
smaller content on the relative mass basis and
high dispersion degree. The N2 sorption
experiments confirmed that the materials
present well-defined mesoporous structure with
high surface area and narrow mesopore size
distributions. The SEM images show obviously
the macropores of 300 – 800 nm in size
arranged parallel to each other in the particles,
and the TEM images show that the
macroporous walls are nanostructured and
composed of the wormholelike mesopores that
resulted from the nanoparticle assembly. The
observed particle size of the RuO2 crystallites
was approximately 2-3nm with some
aggregations. Epoxidation of styrene was
studied with meso-macroporous TiO2
supported RuO2 with different Ru loading
amount. The results show that supported
1.0Ru% mesomacroporous TiO2 has a better
catalytic activity on styrene epoxodation with
H2O2 than pure meso-macroporous TiO2.
RuO2 loading amount was increased from
1w.t% to 2 w.t%, aiming to acquire the
catalytic improvement. Unfortunately, the
increment in the amount of RuO2 loaded
beyond 1w.t% not only result in lower styrene
conversion but also lower styrene oxide
selectivity. This may be attributed to the
decrease of BET surface area and pore volume
of TiO2 with the RuO2 loading amount
increment.
: 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
Added Date
: Sunday, February 22, 2009
Researchers
Researcher Name Researcher Name Researcher
Dr
Email
(Arabic)
(English)
Type
Grade
Jian-Feng Gu
Jian-Feng Gu
Researcher Doctorate
Gao-Song Shao
Gao-Song Shao
Researcher Doctorate
Zhong-Yong Yuan Zhong-Yong Yuan Researcher Doctorate
Files
File Name
18549.pdf
Type
pdf
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