H-beta zeolite proved to be an active and selective catalyst for alkylation of benzene withpropene. In situ spectroscopic methods were applied to follow the formation and the evolution of surface intermediates and products. It was found that when benzene is take alone on the zeolite surface, its adsorption is reversible up to 473 K. On the contrary propene propene undergoes to several transformations even at 295 K. Isopropylbenzenes behaves as propene, giving the same intermediates and products by decomposition at higher temperatures. Isopropyl cations formed upon chemisorption of propene on Broensted acid sites are the key intermediates for the alkylation reaction and are responsible for the faster deactivation via unsatured carbenium ion formation.
ASJC Scopus subject areas
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry