Catalytic selective oxidation of isobutane to methacrylic acid on supported (NH4)3HPMo11VO40 catalysts.

Highlights: [•] 40wt.% loading of (NH4)3HPMo11VO40 on Cs3PMo12O40 leads to the better thermal stability. [•] Cross-transfer of V and Cs species was found to be responsible for the partial deactivation of the catalysts. [•] Selectivity in methacrylic acid and methacrolein increased with the amount of strong and very strong acidic sites. [•] Relationship between surface acid density and the catalytic activity was established. [ABSTRACT FROM AUTHOR]