Catalysis by lanthanide phosphates (LnPs) were studied. Only LaPO4 and CePO4 are effective catalysts in various LnPs for oxidative dehydrogenation of iso-butane. Using a iso-butane rich reactant gas mixture, the selectivity of iso-butene showed 79-86% at 450-550°C. LnPs have no adsorbed oxygen species and the surface lattice oxygen reacted with hydrogen at >200°C. The activity of the lattice oxygen not affected the catalytic activity. A linear relationship has observed between the acid amount and the catalytic activity of the catalysts. This suggests that acidic sites of intermediate strength play a key role in the oxidative dehydrogenation of iso-butane.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry