LIGHT OLEFIN PRODUCTION USING THE MIXTURE OF HZSM-5/MCM-41 AND -Al2O3 AS CATALYSTS FOR CATALYTIC PYROLYSIS OF WASTE TIRES

Authors

  • RURU FU School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, PR China
  • ZHUANGZHANG HE School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, PR China
  • SHIKAI QIN School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, PR China
  • QINGZE JIAO School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, PR China and School of Materials and Environment, Beijing Institute of Technology, Zhuhai, Guangdong, PR China
  • CAIHONG FENG School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, PR China
  • HANSHENG LI School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, PR China
  • YUN ZHAO School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, PR China

DOI:

https://doi.org/10.2298/CICEQ200302025F

Keywords:

catalytic pyrolysis, HZSM-5, light olefins, MCM-41, MCM-41, waste tires, γ-Al2O3

Abstract

In this paper, micro-mesoporous HZSM-5/MCM-41 zeolites were prepared by a two-step hydrothermal method using commercial HZSM-5 with two different silica/alumina ratios (38 and 50) as starting materials. The structures, morpho­logies and acidity of as-prepared zeolites were analyzed using XRD, FT-IR, SEM, N2-adsorption/desorption and NH3-TPD. The HZSM-5/MCM-41 zeolites combined the acidity of microporous HZSM-5 with the pore advantages of mesoporous MCM-41. Mesopores and microspores of 3.34 and 0.95 nm in diameter were found to be present in HZSM-5/MCM-41 zeolites. When they were used to catalyze the pyrolysis of waste tires, the selectivity of light olefins for HZSM-5/MCM-41 prepared using HZSM-5 with the silica/alumina ratio of 50 as starting materials was 21.42%, higher than 18.43% of HZSM-5/MCM-41 syn­the­sized using HZSM-5 with the silica/alumina ratio of 38. In order to further overcome the pore size constraints and mass transfer limitations of HZSM-5/MCM-41 zeolites for catalyzing pyrolysis of waste tires, macroporous
γ-Al2O3 were mixed with HZSM-5/MCM-41 and used as catalysts. The select­ivity to light olefins for the mixture of γ-Al2O3 and HZSM-5/MCM-41 prepared using HZSM-5 with the silica/alumina ratio of 50 as starting materials was 33.65%, which was obviously enhanced by the introduction of γ-Al2O3.

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Published

25.04.2021

Issue

Vol. 27 No. 1 (2021)

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How to Cite

LIGHT OLEFIN PRODUCTION USING THE MIXTURE OF HZSM-5/MCM-41 AND -Al2O3 AS CATALYSTS FOR CATALYTIC PYROLYSIS OF WASTE TIRES. (2021). Chemical Industry & Chemical Engineering Quarterly, 27(1), 69-78. https://doi.org/10.2298/CICEQ200302025F

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