Adsorption and polymerization of acetylene on oxide surfaces. A Raman study

Abstract

Laser Raman spectra have been recorded of adsorbed poly(acetylene) formed by the polymerization of acetylene on γ-alumina and zeolite KX. Spectral evidence indicates that on both γ-alumina and zeolite KX monomeric acetylene is physisorbed via its π electron system in a “side-on” orientation. The chain length of the polyene chains formed on γ-alumina appear to increase with increasing activation temperature. The line intensities in the Raman spectra of the coloured polyenes are significantly enhanced by resonance effects.