Abstract
Catalytic degradation of polystyrene (PS) at ambient pressure was investigated in this study. Samples of PS and catalyst were mixed in a semi-batch reactor. Experiments were carried out in a Pyrex reactor in different conditions, taking temperature and catalyst/PS mass ratio as variables to determine the kinetic parameters. The results indicated that increasing the temperature causes conversion increase. The products of the degradation mostly consist of liquid, gas, and solid residue. The pyrolysis of PS was examined as an effective way to recycle this polymer and recover its styrene monomer. Based on the weight loss of polymer sample, the reaction kinetic parameters are calculated and discussed in the paper. In addition, the effects of temperature and catalyst/polymer ratio were examined, comparing its result to the gaseous and liquid pyrolysis products. Since the oil product contained a high percentage of styrene monomer (>80 %), it is possible to use it directly for the reproduction of the polymer. The experiments indicated a unique catalytic performance for degradation of PS with selectivity to aromatics more than 99 %. The products contained styrene, as the major product, and ethyl benzene, indene, and propyl benzene to some amounts in the liquid. Order of reaction, pre-exponential factor and activation energies were determined using the nth order model technique method. According to the results E (activation energy) and A 0 (Pre-exponential factor) are as the following 1.1326, 194 (kJ mol−1) and 3.2668 × 1014 min−1, respectively.
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Achilias DS, Kanellopoulou I, Megalokonomos P, Antonakou E, Lappas AA (2007) Chemical recycling of polystyrene by pyrolysis: potential use of the liquid product for the reproduction of polymer. Macromol Mater Eng 292(8):923–934
Anders G, Burkhardt I, Illgen U, Schulz IW, Scheve J (1990) The influence of HZSM-5 zeolite on the product composition after cracking of high boiling hydrocarbon fractions. Appl Catal 62(1):271–280
Anderson D, Freeman ES (1961) The kinetics of the thermal degradation of polystyrene and polyethylene. J Polym Sci 54(159):253–260
Armaroli T, Trombetta M, Alejandre AG, Solisb JR, Busca G (2000) FTIR study of the interaction of some branched aliphatic molecules with the external and internal sites of H-ZSM5 zeolite. Chem Phys Lett Chem Phys 2:3341
Audisio G, Bertini F, Beltrame PL, Carniti P (1990) Catalytic degradation of polymers: Part III—degradation of polystyrene. Polym Degrad Stab 29(2):191–200
Bagri R, Williams PT (2004) Hydrocarbon gases and oils from the recycling of polystyrene waste by catalytic pyrolysis. Energy 28:31–44
Bazargan A, McKay G (2012) A review—synthesis of carbon nanotubes from plastic wastes. Chem Eng 196:377–391
Bockhorn H, Hornung A, Hornung U (1998a) Gasification of polystyrene as initial step in incineration, fires, or smoldering of plastics. Symposium (international) on Combustion, pp 1343–1349
Bockhorn H, Hornung A, Hornung U (1998b) Stepwise pyrolysis for raw material recovery from plastic waste. J Anal Appl Pyrol 46(1):1–13
Bockhorn H, Hentschel J, Hornung A, Hornung U (1999) Environmental engineering: stepwise pyrolysis of plastic waste. Chem Eng Sci 54(15):3043–3051
Bouster C, Vermande P, Veron J (1980) Study of the pyrolysis of polystyrenes: I. Kinetics of thermal decomposition. J Anal Appl Pyrol 1(4):297–313
Carniti P, Beltrame PL, Massimo A, Gervasini A, Audisio G (1991) PolyStyrene thermodegradation kinetics of formation of volatile products. Ind Eng Chem Res 30:1624–1629
De la Puente G, Sedran U (1998) Recycling polystyrene into fuels by means of FCC: performance of various acidic catalysts. Appl Catal B 19(3):305–311
Domingo V, Javier F (2008) Analytical strategies for the quality assessment of recycled high-impact polystyrene (HIPS)
Hirose T, Nishio S, Morioka Y, Azuma N, Ueno A, Ohkita H, Zhang MO (1995) Chemical recycling of waste polystyrene into styrene over solid acids and bases. Ind Eng Chem Res 34:4514–4519
Horvat N (1999) Tertiary polymer recycling: study of polyethylene thermolysis as a first step to synthetic diesel fuel. Fuel 78:459–470
Kaminsky W (1991) Recycling of polymeric materials by pyrolysis. In: Makromolekulare Chemie. Macromolecular Symposia, vol. 48, No. 1, Hüthig & Wepf Verlag¸ pp 381–393
Kaminsky W, Predel M, Sadiki A (2004) Feedstock recycling of polymers by pyrolysis in a fluidised bed. Polym Degrad Stab 85(3):1045–1050
Karaduman A (2002) Pyrolysis of polystyrene plastic wastes with some organic compounds for enhancing styrene yield. Energy Sources 24(7):667–674
Kim JS, Lee WY, Lee SB, Kim SB, Choi MJ (2003) Degradation of polystyrene waste over base promoted Fe catalysts. Catal Tod 87:59–68
Kiran N, Ekinci E, Snape CE (2000) Recyling of plastic wastes via pyrolysis. Resour Conserv Recycl 29(4):273–283
Kraines S, Shigeoka H, Komiyama H (2003) A system tradeoff model for processing options for household plastic waste. Clean Technol Environ Policy 4(4):204–216
Lee SY, Yoon JH, Kim JR, Park DW (2002) Degradation of polystyrene using clinoptilolite catalysts. J Anal Appl Pyrol 64(1):71–83
Liu Y, Qian J, Wang J (2000) Pyrolysis of polystyrene waste in a fluidized-bed reactor to obtain styrene monomer and gasoline fraction. Fuel Process Technol 63(1):45–55
Miskolczi N, Nagy R (2012) Hydrocarbons obtained by waste plastic pyrolysis: comparative analysis of decomposition described by different kinetic models. Fuel Process Technol 104:96–104
Ohkita H, Nishiyama R, Tochihara Y, Mizushima T, Kakuta N, Morioka Y, Ueno A, Namiki Y, Tanifuji S (1993) Acid properties of silica-alumina catalysts and catalytic degradation of polyethylene. Ind Eng Chem Res 32:3112–3116
Paradela F, Pinto F, Gulyurtlu I, Cabrita I, Lapa N (2009) Study of the co-pyrolysis of biomass and plastic wastes. Clean Technol Environ Policy 11(1):115–122
Roozbehani B, Anvaripour B, Esfahan ZM, Mirdrikvand M, Moqadam SI (2014) Effect of temperature and catalyst loading on product yield in catalytic cracking of high density polyethylene (HDPE). Chem Technol Fuels Oils 49(6):508–516
Sakaki SA, Roozbehani B, Shishesaz M, Abdollahkhani N (2014) Catalytic degradation of the mixed polyethylene and polypropylene into middle distillate products. Clean Technol Environ Policy 16(5):901–910
Sakata Y, Uddin MA, Muto A (1999) Degradation of polyethylene and polypropylene into fuel oil by using solid acid and non-acid catalysts. Anal Appl Pyrol 51:135–155
Serrano DP, Aguado J, Escola JM (2000) Catalytic conversion of polystyrene over HMCM-41, HZSM-5 and amorphous SiO2–Al2O3: comparison with thermal cracking. Appl Catal B 25(2):181–189
Simard YDM, Kamal MR, Cooper DG (1995) Thermolysis of polystyrene. J Appl Polym Sci 58(5):843–851
Ukei H, Hirose T, Horikawa S, Takai Y, Taka M, Azuma N, Ueno A (2000) Catalytic degradation of polystyrene into styrene and a design of recyclable polystyrene with dispersed catalysts. Catal Tod 62:67–75
Venuto P, Landis P (1968) Zeolite catalysis in synthetic organic chemistry. Adv Catal 18:259
Westerhout RWJ, Waanders J, Kuipers JAM, Van Swaaij WPM (1997) Kinetics of the low-temperature pyrolysis of polyethene, polypropene, and polystyrene modeling, experimental determination, and comparison with literature models and data. Ind Eng Chem Res 36(6):1955–1964
Williams PT, Williams EA (1999) Interaction of plastics in mixed-plastics pyrolysis. Energy Fuels 13(1):188–196
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Imani Moqadam, S., Mirdrikvand, M., Roozbehani, B. et al. Polystyrene pyrolysis using silica-alumina catalyst in fluidized bed reactor. Clean Techn Environ Policy 17, 1847–1860 (2015). https://doi.org/10.1007/s10098-015-0899-8
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DOI: https://doi.org/10.1007/s10098-015-0899-8