12results 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 present invention relates to the field of catalysts, and discloses a multi-stage hydroisomerization catalyst combination method and a multi-stage hydroisomerization method. The combination method comprises a first hydroisomerization catalyst and a second hydroisomerization catalyst sequentially loaded along a logistics direction, wherein the first hydroisomerization catalyst is loaded in a first hydrogenation reactor, and the second hydroisomerization catalyst is loaded in a second hydrogenation reactor, wherein the first hydroisomerization catalyst and / or the second hydroisomerization catalyst independently comprise a ZSM-48 molecular sieve, wherein the molar ratio of silicon oxide to aluminum oxide in the ZSM-48 molecular sieve is not less than 40, and the specific surface area of ​​the ZSM-48 molecular sieve is not less than 200 m 2 / g, the crystals of the ZSM-48 molecular sieve are ellipsoidal, the major diameter does not exceed 700 nm and the ratio of major diameter to minor diameter is 1-3: 1. The multi-stage hydroisomerization catalyst combination method provided by the present invention helps to improve the efficiency of the catalytic reaction. When the method of the present invention is used to process oil products, the product pour point is lower and the product yield is higher.

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 invention discloses a carbon monoxide removal device and method, relates to the field of carbon oxide separation, and solves the problems that when an existing carbon monoxide removal device is used, the catalytic efficiency of a catalyst is relatively low, and the catalyst is difficult to be subjected to reduction treatment synchronously at the high temperature of a reaction. Comprising a tank body, a removal mechanism, a reduction mechanism, a switching mechanism, a gas inlet pipe and a gas outlet pipe, the removal mechanism comprises a switching column and a storage tank, and the reduction mechanism comprises a spiral pipe. The high temperature generated in the catalytic reaction is used for heating the reducing gas in the spiral pipe, then the high-temperature reducing gas is output into the corresponding storage tank for reduction treatment, and the switching mechanism is used for stirring the catalyst in the storage tank, so that the efficiency of the catalytic reaction and the reduction process is improved; and meanwhile, the position of the storage tank in the switching column can be switched.

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 invention discloses a self-supporting CoNiC / CoNibc catalyst, a preparation method of the self-supporting CoNiC / CoNibc catalyst and application of the self-supporting CoNiC / CoNibc catalyst in the aspects of efficient electro-catalytic hydrolysis and rechargeable zinc-air batteries. The material is prepared by combining a hydrothermal method and a calcination method, CoNibc loaded on a self-supporting substrate is generated by the hydrothermal method, the CoNibc on the surface is decomposed and synthesized again during calcination, and finally in-situ synthesis of CoNiC / CoNibc is realized; the synthesis mode not only overcomes the defects that the load on the surface of the non-self-supporting material is easy to fall off and the stability is poor, but also ensures the overall stability of the composite material. In addition, the appearance of the synthesized CoNiC ultrathin nanosheet greatly increases the exposure of active sites, and the overall catalytic activity of the composite material is improved. Meanwhile, the introduction of the alkali-resistant and heat-resistant cheap stainless steel mesh self-supporting substrate not only improves the conductivity of the composite material, but also ensures the stable operation of the zinc-air battery in a high-concentration electrolyte environment. The catalyst has efficient catalytic hydrolysis activity and long-time charge-discharge cycle performance.

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.

The invention discloses a solid acid catalyst for a micropacked bed reactor and a preparation method of the solid acid catalyst, and relates to the field of catalysts. The preparation method of the solid acid catalyst comprises the following steps: (1) providing a porous carrier, and modifying the porous carrier by adopting an acid solution so as to load hydroxyl on the surface of the porous carrier to obtain a modified carrier; (2) mixing the modified carrier with a solution containing silane, and reacting at 50-200 DEG C for 0.5-36 hours to obtain a first basic catalyst; wherein the silane has a carbon chain length greater than or equal to 3; (3) mixing the first base catalyst with an oxidizing solution, and reacting at 30-100 DEG C for 0.5-36 hours to obtain a second base catalyst; and (4) mixing the second basic catalyst with a solution containing a sulfonic acid group, and reacting at 30-100 DEG C for 0.5-36 hours to obtain a reinforced solid acid catalyst finished product.

The invention discloses a hierarchical pore Zr-Beta molecular sieve as well as a preparation method and application thereof, and relates to the technical field of preparation and application of molecular sieves. The preparation method of the hierarchical pore Zr-Beta molecular sieve comprises the following steps: preparing the hierarchical pore Zr-Beta molecular sieve by a hydrothermal synthesis-etching-recrystallization method; the hierarchical pore Zr-Beta molecular sieve comprises a Beta molecular sieve and Zr loaded on the surface and in a skeleton of the Beta molecular sieve, the average particle size is 100-500 nm, and micropores, mesopores and / or macropores exist in the molecular sieve; the 2, 4-dimethoxyacetophenone is prepared by adopting a hierarchical pore Zr-Beta molecular sieve to catalyze Friedel-Crafts acylation reaction (m-dimethoxybenzene and acetic anhydride) under a solvent-free condition. The hierarchical pore Zr-Beta molecular sieve has a hierarchical pore structure and an acidic molecular sieve catalytic active site, and has a synergistic catalysis effect, and the method for preparing 2, 4-dimethoxyacetophenone is green, environmentally friendly, simple and convenient to operate and high in catalytic efficiency.