The invention relates to a preparation method and application of a
vanadium phosphorus oxide catalyst for regulating and controlling a
crystal face. The preparation method comprises the following steps: preparing a
supergravity circulating device; adding a mixed
solvent of
isobutanol and
benzyl alcohol into a feed
liquid storage area, adding V2O5, heating, preserving heat, starting a motor, an ultrasonic probe and a submerged pump, spraying reaction liquid onto a filler through the submerged pump, returning the reaction liquid to the feed
liquid storage area after the reaction liquid passes through the filler, and carrying out reduction reaction for 1-3 hours; cooling to 85-95 DEG C in the
supergravity circulating device, adding concentrated
phosphoric acid, and heating to 110-115 DEG C; reacting for 3-5 hours to obtain a
vanadium-
phosphorus-
oxygen catalyst precursor; and
drying the
vanadium-
phosphorus-
oxygen catalyst precursor in a
drying oven at the temperature of 110-130 DEG C for 8-15 hours, and then activating at the temperature of 350-450 DEG C. According to the invention, the
crystal face orientation of the prepared catalyst is changed, and a dominant
crystal face is converted into a 001 crystal face from an existing 130 crystal face for preparing a vanadium-phosphorus-
oxygen catalyst (VO(HPO4).0.5H2O).