TY - JOUR
T1 - Catalytic pyrolysis of low density polyethylene over H-β, H-Y, H-Mordenite, and H-Ferrierite zeolite catalysts
T2 - Influence of acidity and structures
AU - Agullo, J.
AU - Kumar, N.
AU - Berenguer, D.
AU - Kubicka, D.
AU - Marcilla, A.
AU - Gómez, A.
AU - Salmi, T.
AU - Murzin, D. Yu.
N1 - Funding Information:
ACKNOWLEDGMENTS This study was conducted as part of the activities of the Åbo Akademi Process Chemistry Centre within the Finnish Centre of Excellence Program (2000–2005) by the Academy of Finland. An International Marie-Curie Fellowship by the European Commission to Javier Agullo Pastor is gratefully acknowledged.
Copyright:
Copyright 2007 Elsevier B.V., All rights reserved.
PY - 2007/7
Y1 - 2007/7
N2 - Low-density polyethylene (LDPE) catalytic pyrolysis was investigated over H-β-25, H-β-150, H-β-300, H-Y-12, H-Mordenite-20, and H-Ferrierite-20 zeolite catalysts. The numbers denote the SiO 2/Al2O3 molar ratios. The influence of the zeolite's acidity on the transformation of LDPE was studied by varying the SiO2/Al2O3 molar ratios of the β zeolite. The influence of the zeolite structure was investigated by using the proton forms of Y, β, Mordenite, and Ferrierite zeolites. The catalysts were characterized using X-ray powder diffraction patterns, nitrogen adsorption, and FTIR spectroscopy with pyridine as the probe molecule. The large pore and least acidic H-β-300 catalyst showed the lowest activity in the catalytic pyrolysis of LDPE. The H-β-25 catalyst, with higher acidity than H-β-300, showed higher activity for LDPE pyrolysis than H-β-300, indicating the importance of strong acid sites for this reaction. The H-Ferrierite and H-Mordenite catalysts, with small pores, showed the lowest effect on LDPE pyrolysis, although the catalysts were more acidic than H-β-25 and H-β-150, indicating that not only acidity but also the structure and pore size of zeolites are important for pyrolysis of LDPE. However, the H-Y zeolite catalyst with large pores and cavities is not suitable for this reaction because of rapid deactivation due to coke formation.
AB - Low-density polyethylene (LDPE) catalytic pyrolysis was investigated over H-β-25, H-β-150, H-β-300, H-Y-12, H-Mordenite-20, and H-Ferrierite-20 zeolite catalysts. The numbers denote the SiO 2/Al2O3 molar ratios. The influence of the zeolite's acidity on the transformation of LDPE was studied by varying the SiO2/Al2O3 molar ratios of the β zeolite. The influence of the zeolite structure was investigated by using the proton forms of Y, β, Mordenite, and Ferrierite zeolites. The catalysts were characterized using X-ray powder diffraction patterns, nitrogen adsorption, and FTIR spectroscopy with pyridine as the probe molecule. The large pore and least acidic H-β-300 catalyst showed the lowest activity in the catalytic pyrolysis of LDPE. The H-β-25 catalyst, with higher acidity than H-β-300, showed higher activity for LDPE pyrolysis than H-β-300, indicating the importance of strong acid sites for this reaction. The H-Ferrierite and H-Mordenite catalysts, with small pores, showed the lowest effect on LDPE pyrolysis, although the catalysts were more acidic than H-β-25 and H-β-150, indicating that not only acidity but also the structure and pore size of zeolites are important for pyrolysis of LDPE. However, the H-Y zeolite catalyst with large pores and cavities is not suitable for this reaction because of rapid deactivation due to coke formation.
UR - http://www.scopus.com/inward/record.url?scp=34548024173&partnerID=8YFLogxK
U2 - 10.1134/S002315840704009X
DO - 10.1134/S002315840704009X
M3 - Article
AN - SCOPUS:34548024173
SN - 0023-1584
VL - 48
SP - 535
EP - 540
JO - Kinetics and Catalysis
JF - Kinetics and Catalysis
IS - 4
ER -