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.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12612675/index.pdf |
| Date | 01 August 2003 |
| Creators | Duzenli, Derya |
| Contributors | Onal, Isik |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | Ph.D. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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