7results about How to "Improve catalytic reaction efficiency" patented technology

The application relates to the field of wastewater treatment catalysis, and discloses a Fe-Cu-Mn ternary hydrotalcite-like catalyst and a preparation method thereof, which comprises iron, copper and manganese; the iron, copper and manganese are distributed in the layer plate metal central site in an atomic dispersion mode; the layer plate oxygen octahedron is in a non-symmetrical stretching distortion state; a 3.2-4.8 degree deviation is generated in the manganese oxygen copper bond angle in the layer plate; the lattice parameter a of the layer plate 110 crystal face direction is 0.305-0.312 nm; the molar ratio of copper to manganese is 1:2-1:5; and the molar sum of copper and manganese to the molar ratio of iron is 2:1-4:1. According to the application, the lattice non-symmetrical distortion induces the space overlap of the auxiliary metal and the iron active center orbit, an electron transfer path is constructed, the shielding effect of the hydroxyl ion on the iron active site under the alkaline environment is eliminated, the catalytic site activity is maintained, and stable and efficient catalytic treatment under wide pH working conditions is realized.

The application discloses a fibrous nitrogen-doped carbon metal mesh composite membrane for water treatment, which utilizes a metal mesh as a base film and a metal source, uses amino acids as a nitrogen source and a carbon source, and forms a stable nitrogen-doped carbon layer through a calcination process and uniformly distributes the nitrogen-doped carbon layer on the surface of the metal mesh. The application utilizes abundant amino and carboxyl functional groups in amino acid molecules, forms a stable chemical chelate structure with metal ions of the metal mesh base through coordination bonding, and effectively enhances the interfacial bonding strength between the nitrogen-doped carbon and the metal mesh base film in the carbonization process through the bonding mechanism at the molecular level.

The invention provides a platinum-bismuth alloy catalyst, a preparation method thereof and a direct methanol fuel cell, and belongs to the technical field of electrochemical catalysts. The method comprises the following steps: mixing carbon black with an acidic aqueous solution, and sequentially carrying out acidizing treatment and roasting treatment to obtain pretreated carbon black; mixing the pretreated carbon black, Bi2O2CO3, a platinum source, a precipitant, a pH regulator, a first dispersing agent and first water, and performing replacement reaction to obtain a suspension; mixing a reducing agent, a second dispersing agent and second water to obtain a mixed solution; dropwise adding the suspension into the mixed solution for reduction reaction to obtain a catalyst precursor; and calcining the catalyst precursor under first protective gas to obtain the platinum-bismuth alloy catalyst. The prepared platinum-bismuth alloy catalyst has excellent electro-catalytic performance, shows relatively high catalytic activity and cycling stability, and can be applied to oxygen reduction reaction of a cathode of a direct methanol fuel cell.

The present application relates to the technical field of petroleum chemical industry, in particular to a kind of heterogeneous synthesis device and method of cyclohexanone oxime.The synthesis device of the present application includes vortex reactor, rotating rod and stirrer;By inserting rotating rod in vortex reactor, annular reaction zone with gap size of 0.5mm-5mm is formed, under the dual action of microscale effect and rotating field, mass transfer resistance is reduced, reaction liquid and catalyst particles are fully contacted, and reaction liquid can be broken into smaller droplets under the shear force provided by rotating field, so that the contact area of oil-water two phases is increased, fully emulsified, uniformly mixed, and the flow distribution of catalyst particles is more uniform, the efficiency of catalytic reaction is improved;At the same time, the concentration distribution of hydrogen peroxide in annular reaction zone is controlled by cooperating with multi-stage feeding mode of hydrogen peroxide, so that the concentration of hydrogen peroxide is matched with the rate of catalytic reaction, thereby improving the utilization rate of hydrogen peroxide, and realizing the efficient synthesis of cyclohexanone oxime.

This invention discloses a catalytic synthesis method for 1-arylmethyl-4-arylmethyl-3-hydroxypyrrole-2-( 5H A method for reacting 1-arylmethyl-4-arylmethylenepyrrole-2,3-dione compounds and diethyl phosphonate in an organic solvent under the presence of a base catalyst undergoes a Michael addition and a 1,4-P-Brook rearrangement tandem reaction. Sodium ethoxide is then added for hydrolysis to yield 1-arylmethyl-4-arylmethyl-3-hydroxypyrrole-2,3-dione compounds and their derivatives. 5H )-ketone. This invention achieves 3-hydroxypyrrole-2-( )-ketone in one step through a series of reactions in a one-pot reaction mode. 5H Alkylation of ketones at the C(4) position: The catalyst used is mild and readily available, enabling highly efficient catalytic reactions with good yields of the target product. It is both economical and environmentally friendly, making it suitable for large-scale applications.

The present application relates to the technical field of electrode material, in particular to Co3S4 / MnCo-LDH / MnCo2S4 nanocomposite material and its preparation method and application. The present application takes soluble manganese salt and soluble cobalt salt as raw materials, takes foam nickel as carrier, carries out hydrothermal reaction under alkaline environment to obtain MnCo-LDH / NF, then immerses MnCo-LDH / NF in a precursor solution composed of soluble cobalt salt and 2-methyl imidazole, and carries out coordination reaction to obtain MnCo-LDH@ZIF-67 / NF, finally adopts thioacetamide to incompletely sulfide MnCo-LDH@ZIF-67 / NF to obtain Co3S4 / MnCo-LDH / MnCo2S4 nanocomposite material. Through Co3S4 and MnCo-LDH, the technical defects existing in MnCo2S4 are overcome.

The application relates to the technical field of photocatalysts, in particular to a TiO2-MOFs photocatalyst and a preparation method and application thereof, and comprises the following steps: adding TiO2 nanoparticles into deionized water to obtain a solution A through dispersion, adding modified MIL-88A / GO into the solution A to obtain a mixed solution, stirring the mixed solution, washing the mixed solution through centrifugal separation of ethanol and deionized water alternately, and freeze-drying to obtain a modified TiO2-MOFs photocatalyst. Through the compounding of the TiO2 nanoparticles and the modified MIL-88A / GO, the adsorption-catalysis synergistic effect is realized, the modified MIL-88A / GO material has the characteristics of high specific surface area, porosity and controllable pore size, can efficiently adsorb pollutants in organic wastewater, provides a high-concentration reaction environment for the photocatalytic reaction of the TiO2 nanoparticles, and the electron-hole pairs generated under the excitation of photons of the TiO2 nanoparticles as the efficient photocatalyst can quickly oxidize and degrade the adsorbed pollutants.