4results about How to "Controllable ratio" patented technology

The application relates to the technical field of electrochemical reduction, and discloses a preparation method and application of a catalyst for electro-reduction of nitro nitrogen into ammonia in high-salt wastewater, which comprises the following steps: (1) stirring and dissolving metal salts, a carbon source and a nitrogen source in an alcohol-water mixed solvent to obtain a precursor solution; wherein the metal salts are cobalt salts and copper salts, the Co:Cu molar ratio is 1-5:1, and the nitrogen source is a cyanamide-containing compound; (2) evaporating and crystallizing the precursor solution to obtain an organic metal salt; and (3) adding the organic metal salt into a dimethylimidazole-ethanol solution, performing ball milling treatment, and pyrolyzing in an inert atmosphere to obtain a nitrogen-doped carbon-based cobalt-copper bimetallic catalyst. The organic nitrogen and metal coordination are doped twice and anchored on the carbon matrix, the catalyst active sites and stability are effectively improved, the corrosion failure of the catalyst under the condition of high-salt wastewater is avoided, and efficient and stable reduction conversion of nitrate in high-salt wastewater is realized.

The application discloses a kind of preparation and application of g-C3N4 / VPO photothermal catalytic material, its characteristics are that g-C3N4 nanosheet is assembled with VPO nanosheet using electrostatic assembly strategy, and photothermal catalytic material of general formula g-C3N4 / VPO is obtained.Under photothermal condition, g-C3N4 / VPO is used as photothermal catalyst, and high-efficiency selective oxidation of n-butane is carried out to prepare maleic anhydride at low temperature.Compared with prior art, the application has the advantages of low reaction temperature, high selectivity, mild preparation conditions, large-scale preparation, green reaction, and wide application prospect.

The application provides a preparation method and application of a Pd-Ni composite metal oxide methane dry reforming catalyst. The application uses a palladium-nickel-based composite metal oxide catalyst with distributed active metals (Ni, Mg, Pd). The application applies the catalyst to a methane dry reforming reaction to prepare synthesis gas. The preparation method is simple. The proportion of each metal in the catalyst is adjustable and controllable, and the active metal nickel is uniformly distributed. Through relevant data processing and catalyst evaluation, it is confirmed that the catalyst has high catalytic activity, and has remarkable anti-coking and anti-sintering abilities. After 600 hours of stability test, the methane and carbon dioxide conversion rates are high and stable, and the H2 / CO ratio of the obtained synthesis gas is close to 1.

The utility model relates to a compressed gas foam generating device belongs to coal mine fire prevention technical field. The utility model discloses water inlet unit, jet mixing unit, static mixing unit, foaming unit and foam output unit are sequentially communicated along the medium flow direction. The utility model adopts three -level net -like foaming structure, and the gas -liquid contact and bubble dispersion effect are strengthened gradually, and the foam expansion multiple and stability have been improved significantly, the water pressure is changed through the adjustment water inlet valve, thereby the negative pressure intensity that jet nozzle produces is adjusted, realizes the quantitative inhalation of foaming agent, makes the ratio of water and foaming agent can be accurately controlled under different working conditions, through the liquid suction of jet nozzle negative pressure and the multiple disturbance effect of static helical spoiler, make water and foaming agent fully homogeneous mixture. The foam bubble particle size distribution of the utility model finally output is even, and the structure is compact, has higher expansion degree and covering performance, can be applied to mine fire prevention and disaster emergency disposal efficiently.