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Development Of Sol-gel Catalysts By Use Of Fast Combinatorial Synthesis And High Throughput Testing Techniques For Catalytic Oxidation Of Propylene To Propylene Oxide

Middle East Technical University Library E-Thesis Archive

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Title Development Of Sol-gel Catalysts
By Use Of Fast Combinatorial Synthesis And High
Throughput Testing Techniques For Catalytic Oxidation
Of Propylene To Propylene Oxide
 
Creator Duzenli, Derya
 
Subject TP Chemical Engineering 155-156
Propylene, Epoxidation, Sol-Gel, High-Throughput Testing
 
Description Propylene oxide (PO) is an important raw material for the chemical industry,
which is produced commercially by the chlorohydrin process and
hydroperoxide process. However the deficiencies in these processes have
given rise to considerable interest in the development of a direct route to PO
that does not produce by-products or coproducts.
The development of novel, active and selective catalysts for gas phase
oxidation of propylene using molecular oxygen were studied via testing a
large number of catalysts by high-throughput screening method over
combinatorially prepared different catalytic system in this study.
v
The promoted and un-promoted silver (Ag), copper (Cu), manganese (Mn)
mono and bimetallic catalytic system over high and low surface area silica,
alumina, titanium oxide and titanium-silicate supports were prepared by
single step sol-gel method and by incipient wetness method. The study to
determine the most effective catalyst and promoter in the epoxidation
reaction with different reaction conditions, showed that potassium (K)-
promoted Cu metal supported over high surface area silica favored the PO
production at a high reaction temperature (350 °
C) and oxygen rich
atmosphere (C3H6/O2=1.0).
The catalyst showed high and low propylene oxide productivity was
investigated by some of the characterization techniques. The highlydispersed
copper particle over silica support was determined by XRD, TEM
and XPS techniques. The only change between promoted and un-promoted
catalyst was found out in the temperature dependence of propylene
consumption and PO production rate. It was inferred that potassium (K) only
neutralizes the acid sites of silica.
 
Publisher METU
 
Contributor Onal, Isik
 
Date 2003-08-01
 
Type Ph.D. Thesis
 
Format text/pdf
 
Identifier http://etd.lib.metu.edu.tr/upload/12612675/index.pdf
 
Language Eng
 
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