Collection of Czechoslovak Chemical Communications - digital archive 

Abstract

Differences in the behaviour of the non-stabilized form and of stabilized forms of the Y-type zeolite with Cr³⁺ in the interaction with ethylene were investigated. While with the stabilized forms the polymerization of ethylene takes place with initial rates r₀ = 9-12 . 10^-2 g(C₂H₄)g^-1 (zeolite) min^-1, the initial rate of polymerization with the non-stabilized zeolite containing Cr³⁺ is by two orders of magnitude lower. In the infrared spectra of OH stretching vibrations of the zeolites with Cr³⁺ cations two new bands were found at 3 660 and 3 550 cm^-1, in comparison with the initial samples. These bands were ascribed to hydroxocomplexes of chromium.