Mecanismos de degradación térmica y catalítica de poliestireno bajo condiciones de hidrocraqueo.
- Fuentes Ordoñez, Edwin Gustavo
- González Marcos, María Pilar
- López Fonseca, Rubén
- Gutierrez Ortiz, José Ignacio
- González-Velasco, J. R.
ISSN: 0718-8706
Year of publication: 2012
Volume: 3
Issue: 3
Pages: 69-81
Type: Article
More publications in: Avances en Ciencias e Ingeniería
Abstract
In this study, differences between reaction mechanisms involved in thermal and catalytic processes of polystyrene degradation, 30% wt. in decalin, over Pt/Al2O3 bifunctional catalyst, are presented. Oligomers and aromatic derivates, mainly styrene, are mainly produced through the thermal process, whereas, with Pt/Al2O3, both depolymerisation and hydrogenation reactions have occured. Oligomers, in a lower concentration than in the thermal process, and aromatics, mainly ethyl benzene, are obtained through depolymerisation with catalyst. Aromatic compounds produced by polymer degradation are partially hydrogenated. These facts suggest the possibility to obtain good quality products through hydrocracking, which could be directly used as fuels without an ulterior hydrotreatment. However, bifunctional catalysts, with both metallic and Lewis acidic sites, are not ideal for this process, because they promote radical hydrogenation reactions, that terminate the polystyrene degradation process, and, additionally, Pt/Al2O3 does promote neither aromatic ring opening nor cracking reactions.