Main Article Content
The pyrolysis reaction of poly(ethylene terephthalate) or PET bottle waste was conducted comparatively in two cases: without catalyst and with MgO-ZSM-23 zeolite catalyst. The pyrolysis of PET was successfully decomposed to the product of liquid/wax, char, and gas (major product). Applying MgO-ZSM-23 catalyst, the product shows pronounced higher yield of gas (72.5 vs. 58.7 wt.%) and less yield of char solid (8 vs. 17.6 wt.%). The gas product shows less yield of CO2 (75 vs. 98 wt.%) but gives higher hydrocarbon gas fractions of C1–C5 (25 vs. 2.1 wt.%). In liquid/wax products, the catalytic pyrolysis shifted the product spectrum from higher molecular weight, e.g., biphenyl, terphenyl to benzene derivatives, predominantly in “benzoic acid”.
 I. Ahmad, M. I. Khan, H. Khan, M. Ishag, R. Tariq, K. Gul, and W. Ahmad, “Pyrolysis study of polypropylene and polyethylene into premium oil products,” International Journal of Green Energy, vol. 12, no. 7, pp. 663–671, 2015.
 S. H. Ng, H. Hesham, M. Stanciulescu, and Y. Sugimoto, “Conversion of polyethylene to transportation fuels through pyrolysis and catalytic cracking,” Energy Fuels, vol. 9, pp. 735–742, 1995.
 A. Karaduman, “Pyrolysis of polystyrene plastic wastes with some organic compounds for enhancing styrene yield,” Energy Resources, vol. 24, no. 7, pp. 667–674, 2002.
 T. Masuda, Y. Miwa, A. Tamagawa, S. R. Mukai, K. Hashimoto, and Y. Ikeda, “Degradation of waste poly(ethylene terephthalate) in a steam atmosphere to recover terephthalic acid and to minimize carbonaceous residue,” Polymer Degradation and Stability, vol. 58, pp. 315–320, Jun. 1997.
 T. Yoshioka, G. Grause, C. Eger, W. Kaminsky, and A. Okuwaki, “Pyrolysis of poly(ethylene terephthalate) in a fluidized bed plant,” Polymer Degradation and Stability, vol. 86, pp. 499–504, Jun. 2004.
 C. J. Plank, E. J. Rosinski, and M. K. Rubin, “Crystalline zeolite ZSM-23 and synthesis,” U.S. Patent 4 076 842, Feb 28, 1978.
 S. Ernst, G. T. Kokotailo, R. Kumar, and J. Weitkamp, “Shape selective catalysis in zeolites ZSM-22 and ZSM-23 influence of pore shapes on reaction selectivities,” in Proceedings 9th International Congress on Catalysis, 1988, pp. 388–395.
 D. N. Gerasimov, V. V. Fadeev, A. N. Loginova, and S. V. Lysenko, “Catalysts based on zeolite ZSM-23 for isodewaxing of a lubricant stock,” Catalysis in Industry, vol. 5, pp. 123–132, Apr. 2013.
 B. Wang, Q. Gao, J. Gao, D. Ji, X. Wang, and J. Suo, “Synthesis, characterization and catalytic C4 alkene cracking properties of zeolite ZSM-23,” Applied Catalysis, vol. 274, pp. 167–172, 2004.
 J. Fermoso, H. Hernando, P. Jana, I. Moreno, J. Prech, C. Ochoa-Hernandez, P. Pizarro, J.M. Coronado, J. Cejka, and D. P. Serrano, “Lamellar and pillared ZSM-5 zeolites modified with MgO and ZnO for catalytic fast-pyrolysis of eucalyptus woodchips,” Catalysis Today, vol. 277, part 1, pp. 171–181, Nov. 2016.
 R. Yeetsorn, S. Tungkamani, and S. Yoshikazu, “Potential activity evaluation of CoMo/Al2O3-TiO2 catalysts for hydrodesulfurization of coprocessing bio-oil,” KMUTNB Int J Appl Sci Technol, vol. 7, no. 4, pp. 35–45, Sep. 2014.
 M. M. J. Treacy and J. B. Higgins, Collection of Simulated XRD Powder Patterns for Zeolites, Amsterdam, Netherlands: Elsevier, 2007, pp. 298–299.
 M. Thommes, K. Kaneko, A. V. Neimark, J. P. Olivier, F. Rodriguez.-Reinoso, J. Rouquerol, and K. S. W. Sing, “Physisorption of gases with special reference to the evaluation of surface area and pore size distribution,” Pure and Applied Chemistry, vol. 89, no. 9–10, pp. 1051–1069, 2015.
 F. Welle, “Twenty years of PET bottle to bottle recycling-an overview,” Resources Conservation and Recycling, vol. 55, pp. 865–875, 2011.
 T. Maki and K. Takeda, “Benzoic acid and derivatives,” in Ullmann’s Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH Verlag GmbH & Co. KGaA, 2000.
 A. Renzetti, H. Nakazawa, and C.-J. Li, “Rhodiumcatalysed tandem dehydrogenative coupling-Michael addition: direct synthesis of phthalides from benzoic acids and alkenes,” RSC Advances, vol. 6, pp. 40626–40630, 2016.