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Study of the deactivation process of HZSM5 zeolite during polyethylene pyrolysis

Paper ID Volume ID Publish Year Pages File Format Full-Text
43363 45966 2007 10 PDF Available
Title
Study of the deactivation process of HZSM5 zeolite during polyethylene pyrolysis
Abstract

The deactivation process of HZSM5 zeolite during the catalytic degradation of LDPE and HDPE has been studied by repeated batch operation using the same sample of catalyst in consecutive cycles until almost a total loss in the activity of the catalyst was observed. The gaseous and condensed products generated in each cycle were analysed as well as the coked catalyst obtained. They were characterized by nitrogen adsorption–desorption isotherms at 77 K, temperature programmed desorption of ammonia and thermogravimetric analysis.The deactivation process of HZSM5 depends on the type of polyethylene used. With LDPE the zeolite showed a slow deactivation. In the first four consecutive cycles the coke deposit increased, significantly changing the properties of the catalyst although the yield of gaseous and condensed products remained nearly constant throughout. From the fifth cycle on no more coke was deposited on the catalyst but the composition of products changed progressively, tending to that obtained in a thermal process. This behaviour could be related to the change in coke composition because of the effect of the temperature and the time. On the other hand, with HDPE, a clear relationship of the coke content, acidity, activity and textural properties of the catalyst with the products generated was observed.

Graphical abstractThe deactivation process of HZSM5 zeolite during the catalytic cracking of LDPE and HDPE has been studied by repeated batch operation using the same sample of catalyst in consecutive cycles until almost a total loss in the activity of the catalyst was observed. The gaseous and condensed products generated in each cycle were analysed as well as the coked catalyst obtained. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Catalytic pyrolysis; Catalyst activity; Catalyst deactivation; HZSM5; LDPE; HDPE
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Study of the deactivation process of HZSM5 zeolite during polyethylene pyrolysis
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 333, Issue 1, 3 December 2007, Pages 57–66
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
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Price after discount Only $4.95
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Full-text PDF Download
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Any Questions? feel free to contact us