Catalytic degradation of high density polyethylene over nanocrystalline HZSM-5 zeolite
| Autor: | C. Berrueco, J.F. Mastral, J. Ceamanos, M. Gea |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Olefin fiber
Wax Materials science Polymers and Plastics Concentration effect Condensed Matter Physics Catalysis Linear low-density polyethylene Low-density polyethylene Chemical engineering Mechanics of Materials visual_art Polymer chemistry Materials Chemistry visual_art.visual_art_medium High-density polyethylene Zeolite |
| Zdroj: | Polymer Degradation and Stability. 91:3330-3338 |
| ISSN: | 0141-3910 |
| DOI: | 10.1016/j.polymdegradstab.2006.06.009 |
| Popis: | High density polyethylene (HDPE) was catalytically degraded using a laboratory fluidised bed reactor in order to obtain high yield of gas fractions at mild temperatures, between 350 and 550 °C. The catalyst used was nanocrystalline HZSM-5 zeolite. High yields of butenes (25%) were found in the gas fractions, which were composed mainly of olefins. Waxes were wholly composed of linear and branched paraffins, with components between C 10 and C 20 . The effects of both temperature and polymer to catalyst ratio on the product yield were studied. Gas conversion was dramatically decreased when the operation temperature was low (below 450 °C) or when the polymer to catalyst ratio was greatly increased (9.2). Gas and wax compositions significantly altered over 500 °C, showing that a part of the HDPE was degraded thermally, increasing the olefin concentration in the waxes. The same variation was observed in the experiments carried out at high polymer to catalyst ratios, obtaining a 50% olefinic concentration in the waxes. The differences observed in product distributions can be attributed to both thermal and catalytic degradations. |
| Databáze: | OpenAIRE |
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