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The STUDIA UNIVERSITATIS BABEŞ-BOLYAI issue article summary
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Abstract: In this paper, gas chromatography mass spectrometry (GC-MS) and Fourier-transform infrared spectrometry (FTIR) were used to study the liquid products obtained from the thermal and catalytic degradation of polystyrene waste (PS) in order to establish the conditions for the best conversion degree of polystyrene waste into styrene monomer. The polystyrene waste was submitted to a thermal degradation process at 380C and 430C respectively, in absence and in presence of different types of metallic oxides as catalysts in a ratio of 1/10 in mass, catalyst/PS. The used catalysts were: amphoteric solids, two types of alumina; acidic solid, silica gel and basic solids, calcium oxide and copper oxide 13% deposited on alumina. Gas and liquid products and a residue were obtained by the degradation process of polystyrene waste. The yields for all obtained liquid products at both temperatures were between 83 and 89%. The GC-MS results showed that the liquid fractions contain mainly toluene, ethylbenzene, styrene monomer, (1-methylethyl) benzene and -methylstyrene. The FTIR spectra of liquid products indicated the specific vibration bands of the functional groups of these compounds. The obtained results showed that the most efficient catalyst used in the thermal degradation of polystyrene waste was silica gel, for which it was obtained the largest amounts of styrene monomer at both temperatures (68.76% at 380C and 73.16% at 430C).
Keywords: polystyrene waste, thermal and catalytic degradation, GC-MS, FTIR, styrene monomer |
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