Texture, surface acidic and catalytic properties of niobium phosphate

Abstract

The texture and surface acidic properties on niobium phosphate and its catalytic activities for isomerization of 1-butene, dehydration of 2-butanol and polymerization of propylene were studied as a function of pretreatment temperature. The surface of niobium phosphate showed strong acid sites of H o - 8.2, for temperatures between 100 and 500°C; the acid sites were ascribed as Lewis and Bronsted sites on the basis of IR spectra of adsorbed pyridine. The activity for dehydration of 2-butanol was higher for samples pretreated at 150°C and activities for isomerization of 1-butene and polymerization of propylene were higher for samples pretreated at 250 and 300°C repectively.