The high-temperature ring-opening reactions of methyloxirane were investigated with or without added hydrogen over silicasupported Pd and Rh catalysts. Without added hydrogen, mainly isomerization occurred, giving acetone through the rupture of the sterically less hindered C-O bond (route b). With added hydrogen, hydrogenative ring opening also took place and the sterically more hindered C-O bond was broken as well (route a). At 473 K allyl alcohol was formed too: a product not found at lower temperatures. Since route a was predominant over both catalysts, a bifunctional mechanism had to be considered. It is known that methyloxirane adsorbs irreversibly, therefore the shape of product formation rate vs. hydrogen pressure curves could be used for mechanistic considerations.
- High temperature effects
- Pressure dependence
- Ring-opening reactions
- Supported catalysts
ASJC Scopus subject areas
- Process Chemistry and Technology
- Physical and Theoretical Chemistry