Thermo-catalytic degradation of low density polyethylene over clinoptilolite
– the effect of carbon residue deposition (in English)
Polimery 2010, No 3, 222
Thermo-catalytic degradation of low density polyethylene (PE-LD) was studied in the presence of the natural zeolite - clinoptilolite. The effect of carbon deposition on the catalyst activity was also investigated. It was observed that the PE-LD degradation process over clinoptilolite proceeded at shorter time and lower temperature. The catalyst activity tests were carried out in argon in a stainless steel batch reactor at temperature, up to 410°C at ambient pressure. The decomposition products were classified into three groups: gases, liquids and solid-like residues. The liquid products were analysed by gas chromatography coupled with mass spectrometry GC/MS method. A shift towards lower molecular mass products was observed in reactions with fresh clinoptilolite. The application of this catalyst in thermal degradation of PE-LD leads to lower alkane to alkene ratios and inhibits the formation of cyclohydrocarbons. The presence of carbon deposit on the surface of re-used clinoptilolite leads to higher ratio of saturated to unsaturated hydrocarbons, but neither did it significantly change reaction temperature nor the phase composition of the reaction products.
Key words: clinoptilolite, thermal degradation, catalytic degradation, low density polyethylene, carbon deposit
Thermo-catalytic degradation of low density polyethylene over clinoptilolite - the effect of carbon residue deposition (in English)