fulltext.study @t Gmail

Catalytic degradation of polyethylene using nanosized ZSM-2 zeolite

Paper ID Volume ID Publish Year Pages File Format Full-Text
41952 45905 2010 6 PDF Available
Title
Catalytic degradation of polyethylene using nanosized ZSM-2 zeolite
Abstract

Nanosized ZSM-2 zeolite with crystal size of ∼100 nm was synthesized and ion exchanged in order to characterize its behaviour in the catalytic degradation of polyethylene (PE) in a semi-batch reactor. The starting ZSM-2 allowed a reduction in the PE degradation temperature of more than 80 °C as quantified by dynamic thermogravimetric analysis (TGA). By either proton or Lanthanum exchanges, the nanozeolite increased the acidity improving even more these degradation processes. The starting nanometric catalyst was dramatically more active than a micrometric Y-zeolite displaying lower onset temperatures of PE degradation due to its higher external surface area. These differences nevertheless were reduced by ion-exchanging the Y-catalysts. Our results confirm the relevance of both the zeolite acidity and other parameters, such as crystal size and crystallinity of the zeolite framework, on the catalytic efficiency. Regarding the degradation products during the catalytic process, both zeolites increased the production of low boiling compounds being more efficient the ZSM-2 based catalysts reaching a yield about 90%. Higher amount of accessible sites active for cracking on the external surface of the nanosized crystals would be responsible of this high gas yield. Furthermore, ZSM-2-based zeolites were highly selective to propylene and C4 compounds compared with Y-based zeolites. These results open up the use of nanosized ZSM-2 zeolites in the catalytic degradation of PE with relevant energetic applications.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (127 K)Download as PowerPoint slideResearch highlights▶ Nanosized zeolites are highly efficient in the catalytic degradation of polyethylene. ▶ The catalytic degradation activity depends on the acidity and structure of the crystal structure. ▶ Polyethylene can be efficiently recycled by means of nanosized zeolite of high acidities.

Keywords
Catalytic degradation; ZSM-2 zeolite; Nanozeolites; Polyethylene
First Page Preview
Catalytic degradation of polyethylene using nanosized ZSM-2 zeolite
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
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 384, Issues 1–2, 20 August 2010, Pages 186–191
Authors
, , ,
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
Online Support
Any Questions? feel free to contact us