High-purity ultrafine tungsten trioxide refers to the tungsten trioxide powder with purity of greater than or equal to 99.99%, apparent density of 0.28~0.3g/cm3. High-purity ultrafine WO3 has good catalytic performance for many reactions such as hydrodeoxygenation (HDO), oxidation, hydrocarbon isomerization and alkylation, etc. It is an important catalyst in petrochemical industry and has a very broad application prospect in the field of catalysis. 
WO3 also has good photochromic property and gas sensitivity. With the further development of material science, other properties of tungsten trioxide will also be widely used in the field of materials.
It has been found that pure tungsten trioxide has almost no catalytic activity due to the lack of metal properties. And it is difficult to obtain good catalytic stability. Therefore, pure tungsten trioxide is partially reduced or doped into active component or modified to improve its catalytic activity.
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