Polymerization of ethylene in the presence of hydrogen over supported vanadium-magnesium catalysts

• Autorzy: Mikenas T. B. , Zakharov V. A. , Echevskaya L. G. , Matsko M. A.

Warianty tytułu

PL

Polimeryzacja etylenu w obecności wodoru na katalizatorach wanadowo-magnezowych na nośnikach

• Konferencja: VII International Seminar on Organometallic Complexes as Catalyst of Vinyl Compounds Polymerization (Turawa k/Opola; 1999)
• Języki publikacji: EN

Abstrakty

EN

Catalyst activity was studied in a slurry polymerization of ethylene carried out over supported VCl4/MgCl2 and VOCl3/MgCl2 cata-lysts in relation to hydrogen concentration (0–40 mmols/L, i.e., 0–2 bar) and to Al(i-Bu)3 and Al(i-Bu)2H, each used as cocatalyst. Hydrogen was found to reduce the activity of the catalyst by 2 to 6 times. The deactivation occurring in the presence of hydrogen was directly related to hydrogen pressure and found to be due to the hydride species of organoaluminum com-pounds forming in the side reaction of AlR3 with the V-H bonds accompanied by adsorption of alkylaluminum hydride on active sites. A sequence of reactions is suggested (eqns. 2-5) to explain the deactivation and reactivation of the catalyst.

Słowa kluczowe

EN

polymerization of ethylene over vanadium-magnesium catalysts; deactivation of catalyst in the presence hydrogen; organoaluminium hydrides as deactivators

PL

polimeryzacja etylenu; katalizatory wanadowo-magnezowe; obecność wodoru; katalizatory alkiloglinowe

• Wydawca: Sieć Badawcza Łukasiewicz – Instytut Chemii Przemysłowej
• Czasopismo: Polimery
• Rocznik: 2000
• Tom: T. 45, nr 5
• Strony: 349--352

Twórcy

autor

Mikenas T. B.

autor

Zakharov V. A.

autor

Echevskaya L. G.

autor

Matsko M. A.

• Boreskov Institute of Catalysis, 630090 Novosibirsk, Russia