Catalytic Degradation of Polyethylene over Mesoporous Molecular Sieve MCM–41 Modified with Heteropoly Compounds
P. Gaca, M. Drzewiecka, W. Kaleta, H. Kozubek, K. Nowińska
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Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-680 Poznań, Poland
Pol. J. Environ. Stud. 2008;17(1):25–31
Degradation of polyethylene was performed over MCM-41 molecular sieves modified with heteropoly acid H3PW12O40 (HPW) and its caesium salt CsHPW12O40 (CsHPW). High silica zeolite ZSM-5 has also been used as degradation catalyst. The applied catalysts (HPW/MCM-41, CsHPW/MCM-41 and ZSM-5 zeolite) resulted in lowering of temperature of HDPE degradation when compared to the thermal pyrolysis as well as influenced the distribution of the products formed as a result of the cracking process. HPW/MCM-41 use resulted in low amount of gas products and almost 80 wt.% of liquids while cracking over H-ZSM-5 produced gas hydrocarbons with selectivity about 50 wt.%. Liquid product obtained in the presence of HPW/MCM-41 comprised aliphatic hydrocarbons (olefins and paraffins) while cracking carried out over ZSM-5 zeolite resulted mainly in the formation of aromatic compounds.