Product Distribution in Degradation of Polypropylene over Silica-Alumina and CaX Zeolite Catalysts
Authors:
- 1 September 1983
- journal article
- Published by Oxford University Press (OUP) in Bulletin of the Chemical Society of Japan
- Vol. 56 (9) , 2768-2773
Abstract
The composition of degradation products of polypropylene, especially liquid fraction, formed over silica-alumina and CaX zeolite catalysts was investigated extensively. The catalysts gave almost the same product distribution as a function of carbon number at the initial stages of the reaction. The liquid fractions were rich in the same isoalkanes and aromatics as those contained in the gasoline fraction. Most of the isoalkanes were methyl-branched, while the aromatics consisted mainly of those with one or more methyl groups. The catalytic degradations involved extensive aromatization, isomerization and hydrogen transfer as secondary reactions. The difference in catalytic behaviors between silica-alumina and CaX was most remarkable in coke deposition on the catalysts and more deposition on CaX led to greater saturation of the products. The H/C ratio of the products was regarded as a good measure for the degree of coke formation on the catalyst surfaces.Keywords
This publication has 12 references indexed in Scilit:
- Gas chromatographic determination of the products of degradation of polyethylene over a silica—alumina catalystJournal of Chromatography A, 1983
- Microstructural Characterization of Polypropylenes by High-Resolution Pyrolysis-Hydrogenation Glass Capillary Gas ChromatographyMacromolecules, 1980
- Pyrolysis-molecular weight chromatography: A new on-line system for analysis of polymers. II. Thermal decomposition of polyolefins: Polyethylene, polypropylene, polyisobutyleneJournal of Applied Polymer Science, 1976
- Thermische spaltungsmechanismen in homo‐ und copolymeren aus α‐olefinen, 2.Polypropylene mit bekannter taktizität, polyisobutylen und poly(1‐buten)Die Makromolekulare Chemie, 1975
- Gas Chromatographic Analysis of Catalytic Cracked GasolineJournal of The Japan Petroleum Institute, 1973
- Thermodynamic Equilibria among Benzene and the Methylbenzenes from Spectroscopic Data.Journal of Chemical & Engineering Data, 1961
- Catalytic Cracking of Pure HydrocarbonsIndustrial & Engineering Chemistry, 1946
- Heats, equilibrium constants, and free energies of formation of the monoolefin hydrocarbonsJournal of Research of the National Bureau of Standards, 1946
- Carbon Formation in Catalytic CrackingIndustrial & Engineering Chemistry, 1945
- Free energies and equilibria of isomerization of the butanes, pentanes, hexanes, and heptanesJournal of Research of the National Bureau of Standards, 1941