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Liquid-phase degradation of polyethylene (PE) over MFI zeolites with mesopores: Effects of the structure of PE and the characteristics of mesopores

Paper ID Volume ID Publish Year Pages File Format Full-Text
46768 46448 2011 11 PDF Available
Title
Liquid-phase degradation of polyethylene (PE) over MFI zeolites with mesopores: Effects of the structure of PE and the characteristics of mesopores
Abstract

Four kinds of MFI-meso zeolites with both micro- and mesopores were prepared, characterized, and their catalytic activities were evaluated in the liquid-phase degradation of high-density, low-density, and linear low-density polyethylene (HDPE, LDPE, and LLDPE) in order to discuss their catalytic performance in relation to their porous characteristics and acidity. MFI-syn that was synthesized from partially dissolved MFI zeolite and MFI-sda that was prepared by using a special structure directing agent exhibited highly ordered mesopores with strong acidity and achieved high conversions, about 95%, even with small catalyst loadings (HDPE/catalyst = 20 g/0.05 g) at 380 °C. However, MFI-oxy prepared from an oxyacid-added mixture exhibited a poor catalytic activity because of its low acidity and small pore volume. MFI-alk prepared by an alkali treatment exhibited irregular mesopores and medium conversions. MFI-meso zeolites were especially suitable for the degradation of HDPE and LLDPE, which required a high external surface for the initial degradation of polyethylene and a rapid mass transfer, resulting in a higher catalytic activity. The enhancement of catalytic activity in the degradation of LDPE by the introduction of mesopores was relatively small because of its rapid initial degradation.

Graphical abstractMFI-sda with mesopores in a MFI framework exhibited enhanced catalytic activity in the degradation of LLDPE even with a low level of catalyst loading (0.05 g/10 g LLDPE) at 380 °C because of its wide external surface and large amount of strong acid sites.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Four kinds of MFI-meso zeolites with different porous and acidic properties were prepared and characterized. ► The constitution of mesopores with MFI topology was confirmed by the processing of TEM images. ► The introduction of mesopores into MFI zeolite enhanced its catalytic activity in the degradation of HDPE and LLDPE.

Keywords
Degradation; Polyethylene; MFI zeolite; Mesopore; Acidity
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Liquid-phase degradation of polyethylene (PE) over MFI zeolites with mesopores: Effects of the structure of PE and the characteristics of mesopores
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 108–109, 11 October 2011, Pages 61–71
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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