Improved catalyic performances of MoO3 in the O2 assisted dehydration of 2-butanol thank α=Sb2O4 and spillover oxygen

摘要

We clarify mechanism of the cooperation betweenMoO3 andα=Sb2O4in the O2 –assisted dehydration of 2-butanol(220°C). When used alone, MoO3 loses activity by over-reducing to MoO2 . On the contrary, MoO3 exhibits improvedconversion of 2-butanol and yield to butene when it is used inphysical mixture with α=Sb2O4. The origin of the synergy is 2-fold:thanks to α=Sb2O4,⑴the reduction of MoO3 to lessactive MoO2 is inhibited and ⑵ the surface of f MoO3 isdynamically stabilized to a more active and selective suboxidicstate. These effects are interpreted as due to a remote controlmechanism thanks to spillover oxygen formed on α=Sb2O4.