Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 244, Issue -, Pages 1-6Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2017.02.049
Keywords
HZSM-12 zeolite; Acid sites; High-density polyethylene; Activation energy
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Funding
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior
- Fundo Setorial para Ciencia e Tecnologia em Petroleo (FINEP/CTPE-TRO) [01.10.0644.00]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico [311136/2014-1]
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The catalytic degradation of high density polyethylene (HDPE) was studied in the presence of HZSM-12 zeolites with different Si/AI ratio, by thermogravimetry and pyrolysis coupled to gas chromatography and mass spectrometry. The NaZSM-12 zeolite was synthesized by the hydrothermal method using methyltriethylammonium chloride as template. The HZSM-5 was obtained by ion exchange of NaZSM-12 with ammonium chloride, drying and subsequent calcination. The materials characterization were carried out by chemical analysis, X-ray diffraction, scanning electron microscopy, BET measurements and acidity by n-butylamine adsorption. The obtained HZSM-12 zeolites were physically mixed with HDPE in the proportion of 50%wt and submitted to thermogravimetric analyses at heating rates of 2.5; 5; 10 and 20 degrees C min(-1). The addition of HZSM-12 to HDPE produced a decreasing in the temperature of polymer degradation, which was proportional to the zeolite acidity. The activation energy (Ea) for the process was determined from the non-isothermal model-free kinetic model proposed by Vyazovkin. The Ea decreases linearly with the concentration of acid sites on the HZSM-12 materials. From the pyrolysis data, the obtained products were typically light gases (C-2-C-3); liquid petroleum gases (C-4-C-5); and gasoline (C-6-C-10). This results suggest that acid zeolites are exce(l)lent materials for obtaining alternative fuels from catalytic recycling of plastics. (C) 2017 Elsevier Inc. All rights reserved.
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