Catalytic pyrolysis of polypropylene over Ga loaded HZSM-5

Sumin Pyo; Young-Min Kim; Youna Park; Seul Bee Lee; Kyung-Seun Yoo; Moonis Ali Khan; Byong-Hun Jeon; Yong Jun Choi; Gwang Hoon Rhee; Young-Kwon Park

Journal of Industrial and Engineering Chemistry, Vol.103, 136-141, November, 2021

DOI10.1016/j.jiec.2021.07.027 Export Citation

Catalytic pyrolysis of polypropylene over Ga loaded HZSM-5

Sumin Pyo, Young-Min Kim¹, Youna Park, Seul Bee Lee, Kyung-Seun Yoo², Moonis Ali Khan³, Byong-Hun Jeon⁴, Yong Jun Choi, Gwang Hoon Rhee⁵, and Young-Kwon Park^†

School of Environmental Engineering, University of Seoul, Seoul 02504, Republic of Korea
¹Department of Environmental Engineering, Daegu University, Gyeongsan 38453, Republic of Korea
²Department of Environmental Engineering, Kwangwoon University, Seoul 01897, Republic of Korea
³Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
⁴Department of Earth Resources and Environmental Engineering, Hanyang University, Seoul 04763, Republic of Korea
⁵Department of Mechanical and Information Engineering, University of Seoul, Seoul 02504, Republic of Korea

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The effect of catalyst structure, acidity, and Ga addition of zeolites on the pyrolysis of polypropylene (PP) was investigated by comparing PP cracking efficiency and product distribution properties in this study. Thermogravimetric analysis result indicated that HY(SiO2/Al2O3; 30) is the most effective catalyst lowering PP decomposition temperature, followed by Ga/HZSM-5(30), HZSM-5(30), HZSM-5(80), and HZSM-5 (280). Meanwhile, Ga/HZSM-5(30) revealed the lowest apparent activation energy (Ea), 110 kJ/mol, than HY(30) (159 kJ/mol), and other HZSM-5 catalysts (122 ~ 172 kJ/mol), suggesting its high efficiency lowering Ea on PP pyrolysis. Py-GC/MS results also suggested that Ga/HZSM-5 produces the largest amount of aromatic hydrocarbons, followed by HZSM-5(30), HZSM-5(80), HY(30), and HZSM-5(280). The increase of Ga/HZSM-5(30) amount on PP pyrolysis led the further decrease of Ea value and increase of aromatics production efficiency.

Keywords:Catalytic pyrolysis;Polypropylene;Ga/HZSM-5;Kinetic analysis;Pyrolyzer-gas chromatography/mass;spectrometry

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