Facet-dependent acidic and catalytic properties of sulfated titania solid superacids†
Abstract
Sulfated titania solid superacids with dominant {001}, {001}/{101}, and {101} facets were prepared by the hydrothermal method and subsequent sulfation. Their facet-dependent acidic properties were investigated by the solid-state 31P NMR technique and Pechmann condensation of 5,7-dihydroxy-4-methyl coumarin.