2results about How to "Increase defect concentration" patented technology

The invention provides a preparation method of black titanium dioxide and black titanium dioxide, and relates to the technical field of photocatalytic materials.The preparation method comprises the steps that white titanium dioxide and vanadium pentoxide are evenly mixed to obtain a mixed raw material; uniformly mixing melamine and the mixed raw material according to a mass ratio to obtain intermediate powder; and placing the intermediate powder in a furnace, and calcining in an inert atmosphere to generate black titanium dioxide. The preparation efficiency and safety of the black titanium dioxide can be improved.

The application discloses a ruthenium-based ammonia synthesis catalyst, a preparation method thereof and application of the catalyst in catalytic synthesis of ammonia. The ruthenium-based ammonia synthesis catalyst comprises a high-entropy oxide carrier and a ruthenium active component supported on the carrier; the high-entropy oxide is a single solid solution phase formed by oxides of at least three of Mg, Ca, Sr and Ba and at least two of La, Ce, Pr, Nd and Sm. The preparation method comprises the following steps: mixing soluble salts corresponding to each metal constituting the high-entropy oxide with an organic foaming agent in water, evaporating and concentrating to form a gel, heat-treating the gel at 110-150 DEG C to make the gel foam, and obtaining a porous and fluffy solid precursor; grinding the solid precursor and performing joule heating treatment in a non-oxidizing atmosphere, instantaneously heating the solid precursor to 600-1200 DEG C within 10 seconds, keeping the temperature for 1-10 seconds, and then cooling to obtain the high-entropy oxide carrier; and supporting the ruthenium active component on the high-entropy oxide carrier to obtain the ruthenium-based ammonia synthesis catalyst.