Siloxene-supported catalysts for ethylene polymerization
- Phillips Petroleum Company, Bartlesville, OK (United States)
A new type of Ziegler ethylene polymerization catalyst has been formed using as a support, siloxene, a layer compound with an empirical formula of Si[sub 2]H[sub 2]O. Siloxene is a reducing compound, and it reacts with excess TiCl[sub 4], giving an inactive brown solid with 5.2% Ti and 8.0% Cl. However, when additional TiCl[sub 4] is reduced by a metal alkyl and precipitated onto the brown solid, a catalyst with moderate activity is formed. Maximum activity for ethylene polymerization was obtained when the catalyst was pretreated with n-butylmagnesium, contained 0.06 g CaCl[sub 2]/g siloxene, and was run at 80[degrees]C with 40-50 ppm of TEA cocatalyst. These catalysts are very active in the initial portion of the reaction, but the activity decreases rapidly over the first 30 min. Their hydrogen response and hexene incorporation is similar to that observed with other Ziegler catalysts. 17 refs., 7 figs., 2 tabs.
- OSTI ID:
- 6215993
- Journal Information:
- Journal of Catalysis; (United States), Vol. 141:2; ISSN 0021-9517
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
02 PETROLEUM
ETHYLENE
POLYMERIZATION
SILICON COMPOUNDS
CATALYTIC EFFECTS
TITANIUM CHLORIDES
CATALYST SUPPORTS
CATALYSTS
CHEMICAL PREPARATION
HETEROGENEOUS CATALYSIS
HYDRATES
ZIEGLER CATALYST
ALKENES
CATALYSIS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HYDROCARBONS
ORGANIC COMPOUNDS
SYNTHESIS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
400201* - Chemical & Physicochemical Properties
020400 - Petroleum- Processing