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Title: Catalytic cracking of a polyolefin mixture over different acid solid catalysts

Abstract

Catalytic cracking of a polyolefin mixture consisting of polypropylene and both low- and high-density polyethylene has been studied at 400 C over a variety of acid solids as catalysts. The highest activities were obtained over HMCM-41, n-HZSM-5 zeolite, with nanometer crystal size, and HBeta zeolite. The high surface area and large pores present in HMCM-41 are responsible for the high conversions obtained with this catalyst. Likewise, in the case of n-HZSM-5, the presence of a high external surface area enhances its cracking activity, because the zeolite external acid sites are not sterically hindered for the conversion of the bulky polyolefin molecules. Significant differences are observed in the product distribution: n-HZSM-5 shows the highest selectivity toward C{sub 1}--C{sub 4} gaseous hydrocarbons (50 wt %), HBeta leads mainly to liquid hydrocarbons in the range C{sub 5}--C{sub 12} (60 wt %), whereas HMCM-41 yields both C{sub 5}--C{sub 12} (54 wt %) and C{sub 13}--C{sub 30} (32 wt %) fractions. A certain loss of activity of these catalysts has been observed after one cycle of regeneration. For HMCM-41, this phenomenon is caused by both dealumination and particle aggregation that take place during the regeneration treatment.

Authors:
; ;
Publication Date:
Research Org.:
Complutense Univ. of Madrid (ES)
OSTI Identifier:
20076068
Resource Type:
Journal Article
Journal Name:
Industrial and Engineering Chemistry Research
Additional Journal Information:
Journal Volume: 39; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0888-5885
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; POLYPROPYLENE; CATALYTIC CRACKING; CATALYSTS; PERFORMANCE TESTING; ZEOLITES; MOLECULAR SIEVES; CHEMICAL REACTION YIELD; MUNICIPAL WASTES; INDUSTRIAL WASTES; RECYCLING

Citation Formats

Serrano, D.P., Aguado, J., and Escola, J.M. Catalytic cracking of a polyolefin mixture over different acid solid catalysts. United States: N. p., 2000. Web. doi:10.1021/ie9906363.
Serrano, D.P., Aguado, J., & Escola, J.M. Catalytic cracking of a polyolefin mixture over different acid solid catalysts. United States. doi:10.1021/ie9906363.
Serrano, D.P., Aguado, J., and Escola, J.M. Mon . "Catalytic cracking of a polyolefin mixture over different acid solid catalysts". United States. doi:10.1021/ie9906363.
@article{osti_20076068,
title = {Catalytic cracking of a polyolefin mixture over different acid solid catalysts},
author = {Serrano, D.P. and Aguado, J. and Escola, J.M.},
abstractNote = {Catalytic cracking of a polyolefin mixture consisting of polypropylene and both low- and high-density polyethylene has been studied at 400 C over a variety of acid solids as catalysts. The highest activities were obtained over HMCM-41, n-HZSM-5 zeolite, with nanometer crystal size, and HBeta zeolite. The high surface area and large pores present in HMCM-41 are responsible for the high conversions obtained with this catalyst. Likewise, in the case of n-HZSM-5, the presence of a high external surface area enhances its cracking activity, because the zeolite external acid sites are not sterically hindered for the conversion of the bulky polyolefin molecules. Significant differences are observed in the product distribution: n-HZSM-5 shows the highest selectivity toward C{sub 1}--C{sub 4} gaseous hydrocarbons (50 wt %), HBeta leads mainly to liquid hydrocarbons in the range C{sub 5}--C{sub 12} (60 wt %), whereas HMCM-41 yields both C{sub 5}--C{sub 12} (54 wt %) and C{sub 13}--C{sub 30} (32 wt %) fractions. A certain loss of activity of these catalysts has been observed after one cycle of regeneration. For HMCM-41, this phenomenon is caused by both dealumination and particle aggregation that take place during the regeneration treatment.},
doi = {10.1021/ie9906363},
journal = {Industrial and Engineering Chemistry Research},
issn = {0888-5885},
number = 5,
volume = 39,
place = {United States},
year = {2000},
month = {5}
}