480results about How to "Improve catalytic stability" patented technology

The invention discloses a low-trigger-potential electrochemical luminescence enzyme biosensor for detecting glucose and a construction method and application thereof, the sensor comprises a three-electrode system formed by a working electrode, a reference electrode and a counter electrode, and a liquid to be detected contains luminol; the working electrode is a VMSF modified electrode of confined gold-palladium nanoparticles and is obtained by covalently immobilizing glucose oxidase. Luminol and glucose oxidase are respectively used as an electrochemical luminescence signal molecule and a specific recognition element; by combining the efficient and specific catalytic activity of natural enzyme, the efficient catalytic activity of gold-palladium nanoparticles on luminol electrochemical luminescence and the anti-pollution capacity of a vertical ordered mesoporous silica film, the low-trigger-potential electrochemical luminescence enzyme biosensor without an exogenous co-reactant is constructed; the method has the characteristics of high sensitivity, wide detection linear range and low detection limit, and has great application potential in constructing a portable glucose sensor for diagnosing and monitoring diabetes mellitus.

The invention discloses a preparation method and application of a zinc-manganese bimetal organic framework derived composite nano-enzyme, and belongs to the technical field of nano-materials. Zinc-manganese bimetal organic framework nanoparticles prepared by reacting ZIF-8 with manganese (III) acetylacetonate are used as a template, and are calcined at different temperatures in a tubular furnace to obtain zinc-manganese bimetal organic framework derivative composite nano-enzymes with different morphologies. The nano enzyme has peroxidase-like activity, glutathione peroxidase-like activity and catalase-like activity, and has a wide application prospect in anti-tumor treatment.

The invention belongs to the technical field of water electrolysis hydrogen production, and discloses a three-dimensional structure self-supporting electrode and a preparation method and application thereof. The cobalt-molybdenum boride electrode with the three-dimensional structure is prepared by taking foamy copper as a substrate through a cyclic voltammetry / hydrothermal / roasting three-step method. The electrode prepared by the method is applied to alkaline water electrolysis reaction. Wherein the cobalt molybdenum boride electrode is of an urchin-shaped nanosphere structure composed of nanowires, the diameter of nanospheres ranges from 5 microns to 15 mm, and the diameter of the nanowires ranges from 20 nm to 100 nm. The electrode prepared by the method does not need additional binders such as a current collector, Nafion and sugar alcohol, so that the utilization rate of a catalyst on the surface of the electrode is greatly improved; due to the three-dimensional structure of the electrode, sufficient wetting of electrolyte can be guaranteed, and transmission of reactants and products is facilitated; the synergistic effect among the components and the three-dimensional layered porous nano-structure of the electrode can accelerate the decomposition of water. The electrode can be used for preparing a water electrolysis double-effect electrode, a seawater electrolysis double-effect electrode and a carbon dioxide electroreduction reaction anode electrode.

The invention provides a supported IrOx catalyst as well as a preparation method and application thereof. The supported IrOx catalyst comprises an oxide carrier and an active component supported on the carrier, the active component comprises an Ir elementary substance and amorphous IrOx coated on the surface of the Ir elementary substance; and the crystal structure of the IrOx is long-range disordered and short-range ordered. The preparation method of the supported IrOx catalyst is convenient to implement, high in reproducibility and beneficial to industrial preparation and production, gram-level batch preparation can be achieved under the laboratory condition, and possibility is provided for large-scale preparation of the low-cost, high-activity and high-stability proton exchange membrane water electrolysis hydrogen production anode catalyst.

The invention belongs to the field of material preparation and chemical engineering, and particularly relates to an N-doped modified MOFs (Metal-Organic Frameworks) derived core-shell nanoreactor as well as a preparation method and application thereof. The preparation method comprises the following steps: taking cobalt as a node metal, synthesizing an N-doped modified MOFs material with an organic ligand and a nitrogen source through a hydrothermal reaction, then coating the surface of the material with porous silicon dioxide, and preparing the N-doped modified MOFs derived core-shell nanoreactor through a two-step calcination method. The MOFs derived core-shell nanoreactor prepared by the invention has a large specific surface area, a rich pore structure and excellent catalytic activity and stability, and is high in catalytic activity, good in recycling stability and suitable for large-scale popularization and application when being used as a catalyst for alpha, beta-unsaturated aldehyde transfer hydrogenation.

The invention relates to synthesis of a heterogeneous Fenton catalyst and application of the heterogeneous Fenton catalyst to degradation of PFAS, and belongs to the technical field of environmental engineering water treatment. The preparation method comprises the following steps: roasting an MOF material in a non-oxidizing atmosphere to obtain a carbonized MOF material, taking the carbonized MOF material as a template, synthesizing FeS2 by taking FeSO4, Na2S2O3 and elemental sulfur as raw materials through a hydrothermal method, and preparing to obtain the heterogeneous Fenton catalyst. Then, a three-electrode system is constructed, FeS2-MOF (at) C is used as a catalyst for efficiently degrading PFAS, and the heterogeneous Fenton catalyst has the advantages of being stable in crystal structure, high in electron transfer efficiency, excellent in catalytic performance and the like and is suitable for being used for removing various organic pollutants difficult to degrade.

The invention provides a preparation method of immobilized D-psicose-3-epimerase, which comprises the following steps: firstly aminating inorganic silicon nanoflowers, then activating by using a cross-linking agent glutaraldehyde, finally adding enzyme liquid, reacting in a shaking table for a period of time, and centrifuging and washing the reactant to obtain the product, namely the immobilized D-psicose-3-epimerase. The enzymatic activity and the stability of the immobilized enzyme are obviously improved, the specific enzyme activity of the immobilized enzyme is 446.44-1033.09 U / g protein, the activity of the immobilized enzyme is 163.09% and 181.53% of that of free enzyme after the immobilized enzyme is incubated for 6 h under the condition that the temperature is 30 DEG C or the pH value is 5, 63.18-70.78% of the initial activity is still reserved after the immobilized enzyme is repeatedly used for 10 times, and 46.27-54.38% of the initial activity is still reserved after the immobilized enzyme is stored for 15 days. The immobilized enzyme can catalyze fructose to generate psicose, and a green and efficient preparation technology is provided for production of psicose.

The invention provides a method for synthesizing cyclic carbonate by catalyzing conversion of carbon dioxide with a ZIF-8-coated In2O3 composite material, and belongs to the field of catalytic chemistry. According to the method, carbon dioxide and an epoxy compound are used as raw materials, a ZIF-8-coated In2O3 composite material is used as a catalyst, tetrabutylammonium bromide is used as a cocatalyst, cycloaddition of the epoxy compound and normal-pressure carbon dioxide is performed to synthesize cyclic carbonate, and the ZIF-8-coated In2O3 composite material is prepared by in-situ compounding of ZIF-8 and In2O3 of a hollow prism structure. The ZIF-8-coated In2O3 nano-composite catalyst provided by the invention is simple to prepare, the raw materials are cheap and easy to obtain, the catalytic performance is excellent, and high-selectivity synthesis of cyclic carbonate under mild conditions can be realized. In addition, the catalyst is stable in structure, easy to separate from a product and good in recycling performance, and belongs to an environment-friendly catalyst.

The invention provides a copper-nickel alloy catalytic electrode and a preparation method and application thereof. The copper-nickel alloy catalytic electrode comprises a foamed nickel substrate and a copper-nickel alloy vertically loaded on the surface of the foamed nickel substrate, the molecular formula of the copper-nickel alloy is Cu < 0.81 > Ni < 0.19 >, and the copper-nickel alloy is of a dendritic nanostructure. The preparation method comprises the following steps: adding copper sulfate, nickel sulfate and ammonium sulfate into water, and uniformly stirring to obtain an electrolyte; taking a foamed nickel substrate as a working electrode, taking a saturated silver-silver chloride electrode as a reference electrode, taking a platinum sheet or a graphite rod electrode as a counter electrode, and applying constant current density to the working electrode to obtain a preset electrode; and alternately cleaning the preset electrode by using ethanol and distilled water, and carrying out vacuum drying to obtain the copper-nickel alloy catalytic electrode. According to the prepared copper-nickel alloy catalytic electrode, the copper-nickel alloy is in a dendritic morphology, has abundant active sites and a high specific surface area, and has excellent catalytic activity and stability in hydrogen preparation by coupling hydrogen evolution reaction for synthesizing adipic acid through electro-catalysis of cyclohexanone.

The invention belongs to the field of OER catalysis, and particularly discloses a preparation method of a perovskite-based composite catalyst for surface in-situ desolvation of cobalt-iron-nickel ternary alloy nanoparticles, a perovskite precursor material with the expression formula of A-site defects being A1-xBO3-delta is obtained, and then the perovskite precursor material is roasted in a hydrogen-containing atmosphere at the temperature of 340-410 DEG C to obtain the perovskite-based composite catalyst for surface in-situ desolvation of cobalt-iron-nickel ternary alloy nanoparticles, in the A1-xBO3-delta, A is alkaline earth or a rare earth metal element, B comprises Co, Fe and Ni, and x is more than or equal to 0.85 and less than 1. The invention also comprises the catalyst prepared by the preparation method and the OER catalytic application of the catalyst. The preparation method provided by the invention can be used for preparing materials with special physicochemical and structure and excellent OER catalytic activity.

The invention discloses a flexible self-supporting porous pole piece for an ion battery, a membrane module and a preparation method, the porous pole piece is a porous positive pole piece or a porous negative pole piece, the overall thickness is 9-150 microns, the porous pole piece comprises a supporting framework, an active material and a conductive agent, the supporting framework is a porous fiber membrane made of ultra-high molecular weight polyethylene, and the active material is a porous fiber membrane made of ultra-high molecular weight polyethylene. Active materials and conductive agents are distributed on the surface of the supporting framework. The membrane assembly comprises a porous pole piece and a diaphragm layer which are connected and form an integrated structure, and the number of the diaphragm layer is one, and the number of the porous pole piece is one or two. The preparation method comprises the following steps: preparing a porous pole piece in an extrusion-stretching manner, or preparing a membrane assembly in a co-extrusion-stretching manner, and performing high-temperature annealing after extraction to obtain the high-performance porous pole piece or membrane assembly. The porous pole piece and the membrane assembly have good flexibility, the performance of the porous pole piece and the membrane assembly is not changed after the porous pole piece and the membrane assembly are folded for multiple times, meanwhile, the expansion problem of the porous pole piece and the membrane assembly in the charge-discharge process is effectively avoided, and the thermal stability is high.

The invention is suitable for the technical field of chemical industry, and provides a method for preparing polycarbonate diol by using a titanate catalyst, which comprises the following steps: step 1, transesterification: mixing dimethyl carbonate and 1, 6-hexanediol according to a molar ratio of 1.1-1.5: 1, adding isopropyl titanate which accounts for 0.01-2% of the total raw material amount as a catalyst, and reacting at the temperature of 50-60 DEG C for 1-3 hours; carrying out transesterification on the mixture; step 2, carrying out condensation polymerization to obtain a polycarbonate diol crude product; and step 3, carrying out reduced pressure purification, and removing the small molecular polymer and the residual titanium isopropoxide catalyst to obtain the high-purity polycarbonate diol. According to the present invention, the efficient titanium isopropoxide catalyst is used under the normal pressure, such that the preparation of the high-purity and narrow-molecular-weight-distribution polycarbonate diol is achieved, the operation condition is mild, the production efficiency is high, the cost is low, and the catalyst has characteristics of low boiling point, easy removal and environmental protection.

The invention discloses a multi-metal heterostructure electrocatalyst, a preparation method and application of the multi-metal heterostructure electrocatalyst in plastic recovery, and belongs to the field of electrochemical catalyst.The catalyst comprises hydroxide and a metal heterostructure which grow on a foam metal matrix, and according to the method, soluble metal salt is used as a raw material; the multi-metal heterostructure electrocatalyst is prepared by adopting a two-step electrodeposition method. The catalyst can be applied to the process of recycling PET-derived EG in an alkaline solution through electro-catalysis upgrading, has extremely low overpotential and relatively high Faraday efficiency when being used for electro-oxidation of PET hydrolysate, and has very good catalytic stability. The multi-metal heterostructure electrocatalyst prepared by the method can also be applied to upgrading and recycling of other plastic derivatives, and has a good application prospect in the field of upgrading and recycling of the plastic derivatives.

The invention belongs to the technical field of environmental rock soil, and particularly relates to a preparation method of zeolite-magnetic iron oxide and application of the zeolite-magnetic iron oxide in catalyzing sodium percarbonate to repair petroleum hydrocarbon polluted soil. The specific method comprises the following steps: carrying out alkali treatment on zeolite, and then carrying out heat treatment to obtain alkali-heat combined modified zeolite; extracting an iron element in the iron-containing by-product with acid and preparing ferric hydroxide colloid; and uniformly mixing the alkali-heat combined modified zeolite with the ferric hydroxide colloid, carrying out solid-liquid separation, and then carrying out heat treatment and hydrogen reduction treatment to obtain the zeolite-magnetic iron oxide, the application specifically comprises the following steps: uniformly mixing sodium percarbonate, tween-80, silica sol and water to prepare a turbid solution A; uniformly mixing zeolite-magnetic iron oxide, organic acid, silica sol and water to prepare a turbid solution B; and uniformly mixing the turbid liquid B with the petroleum hydrocarbon polluted soil, then adding the turbid liquid A, uniformly mixing, and maintaining for 12-15 days to finish the remediation.

The invention discloses a preparation method and application of a catalyst for preparing synthesis gas through methane dry reforming, and belongs to the technical field of preparation and application of a catalyst for methane dry reforming. The catalyst is composed of carriers (SiO2, Al2O3, MgO and the like), active metals (Ni, Co and the like), oxide assistants (CeO2, La2O3, ZrO2, MgO, CaO and the like) and alkali metal assistants (Na, K and the like). The oxide auxiliary agent is uniformly dispersed on the surface of the carrier in a nano island structure; the active metal component falls on the surface of the carrier modified by the oxide nano island in a nano particle form. The preparation method of the catalyst is simple, high conversion rates of methane and carbon dioxide, high hydrogen-carbon ratio (H2 / CO) and good catalytic stability can be achieved, in a 2000-hour long-period dry reforming reaction at 800 DEG C, the conversion rates of the carbon dioxide and the methane are up to about 96% and 92%, the hydrogen-carbon ratio is about 0.96, and obvious inactivation does not occur.

The invention provides a self-supporting carbon-based material loaded with iron nanoparticles as well as a preparation method and application of the self-supporting carbon-based material, and belongs to the technical field of preparation and application of an electrocatalyst for removing nitrate in sewage. The preparation method of the self-supporting carbon-based material loaded with the iron nanoparticles comprises the following steps: providing a carbon felt subjected to acid pickling and water bath heating; the method comprises the following steps: mixing an iron precursor and urea in a solvent to obtain a mixed solution containing iron salt; and mixing the carbon felt with the mixed solution containing the iron salt, and carrying out a hydrothermal reaction to obtain the self-supporting carbon-based material loaded with the iron nanoparticles. When the iron nanoparticle-loaded self-supporting carbon-based material provided by the invention is used as a cathode for electro-catalysis of nitrate-containing wastewater, a good removal rate and ammonia nitrogen selectivity are achieved, and the catalyst can keep relatively high nitrate nitrogen removal and ammonia nitrogen production effects under the conditions of acidity, neutrality, alkalinity and different initial nitrate concentrations; the method has the advantages of high removal efficiency, good ammonia nitrogen selectivity, strong stability and the like.

The invention relates to a preparation method and application of a hollow nanorod array oxygen evolution electrode, and belongs to the field of hydrogen production by alkaline electrolysis of water. The self-supporting nickel-iron double-metal hydroxide nanosheet coated cobalt hydroxide hollow nanorod array oxygen evolution electrode is obtained through a continuous electro-deposition method; foamed nickel is used as a substrate, and catalytic active components loaded on the substrate are cobalt hydroxide and ferro-nickel double-metal hydroxide; a hollow nanorod structure vertically grows on the surface of the foamed nickel substrate, and the hollow nanorod structure comprises a hollow nanorod-shaped cobalt hydroxide layer located in the hollow nanorod structure and a plurality of layers of nickel-iron double-metal hydroxide nanosheets wrapping the surface of the hollow nanorod-shaped cobalt hydroxide layer; the diameter of the hollow nanorod is 0.2-1 micron, and the length of the hollow nanorod is 2-3 The electrode provided by the invention has unique morphology and good oxygen evolution catalytic activity.

The invention discloses an IrRu / TiOxNy nanobelt composite catalyst and a preparation method thereof, and the preparation method comprises the following steps: loading an IrRu alloy on a titanium-containing nanobelt carrier by using an ethylene glycol reduction method, placing the titanium-containing nanobelt carrier in the middle of a tubular furnace, vacuumizing, introducing NH3, heating to 500-600 DEG C under flowing NH3, preserving heat for 1-5 hours, and cooling to room temperature to prepare the IrRu / TiOxNy nanobelt composite catalyst, wherein the loading capacity of the IrRu alloy is 10 to 30 weight percent. The IrRu / TiOxNy nanobelt composite catalyst disclosed by the invention not only can realize low-loading-capacity IrRu alloy (the loading capacity is only 10-30wt%), but also still has excellent catalytic activity and stability, and the nitridation temperature of the carrier can be remarkably reduced.

The invention provides a silicon oxide loaded platinum-based high-entropy intermetallic compound catalyst for a propane catalytic dehydrogenation reaction. The catalyst is composed of a silicon oxide carrier and active metal nanoparticles loaded on silicon oxide. The preparation method of the catalyst comprises the following steps: fully drying a silicon oxide material to obtain a catalyst carrier; then, soluble metal salt is used as a precursor, and the heterogeneous catalyst is obtained through equivalent-volume impregnation, drying and reduction. A PtSn intermetallic compound is used as a substrate, the high-entropy intermetallic compound catalyst is prepared through a multi-metal doping strategy, the stability of the catalyst is greatly improved through a high-entropy structure, the electronic state of Pt can be adjusted through introduction of rare earth metal, desorption of propylene is promoted, the particle size of active components is reduced, and the catalytic activity of the catalyst is improved. The conversion rate and the stability of the catalyst are obviously improved. The catalyst shows good catalytic activity and selectivity at high temperature, shows excellent stability, and provides a novel high-activity and high-stability catalytic system for propylene preparation through propane dehydrogenation.

The invention discloses a preparation method of a porous metastable state iridium oxide composite catalyst, which comprises the following steps: uniformly mixing iridium salt, inorganic salt, metal salt, a dispersant and pre-ground sodium nitrate in a solvent, and adjusting the pH value of the solution to 1-3 to obtain a uniformly mixed solution; removing the solvent from the mixed solution to obtain a uniform powder mixture; uniformly grinding the powder mixture, and performing high-temperature roasting in a muffle furnace to obtain a composite metal oxide; and fully washing and drying the composite metal oxide to obtain the porous metastable iridium oxide composite catalyst. The iridium oxide is doped and compositely modified by adopting the inorganic salt, the metal salt and the pore-forming agent, the internal lattice structure, the electronic state and the void structure of the iridium oxide are adjusted, the catalytic activity and the stability are improved, and the method is simple, easy to implement, high in yield, capable of achieving large-scale mass production and beneficial to industrial application.

The invention relates to the technical field of all-vanadium redox flow battery electrodes, and discloses a preparation method of an iron-tungsten loaded graphite felt for a vanadium redox flow battery, which comprises the following steps: dissolving a tungstic acid compound, ferrite and a surfactant in water to prepare an electrodeposition solution; the preparation method comprises the following steps: immersing a graphite felt in an electro-deposition liquid, carrying out vacuum standing, taking out the graphite felt as a working electrode, carrying out electrochemical deposition, cleaning and drying, immersing the obtained metal-loaded graphite felt in an aqueous solution containing benzene peroxide series and phenylenediamine substances, carrying out hydrothermal treatment, cleaning and drying, and carrying out high-temperature treatment on the obtained precursor graphite felt to obtain the metal-loaded graphite composite material. And obtaining the iron-tungsten loaded graphite felt for the vanadium battery. By loading iron and tungsten on the graphite felt, the catalytic activity site and conductivity of the graphite felt can be effectively improved, the benzene peroxide series can partially oxidize tungsten, generated carboxylic acid and phenylenediamine substances form a condensate, and the catalytic activity and stability of the graphite felt fiber are further improved.

The invention discloses a preparation method and application of a nickel-titanium composite catalyst, and the preparation method of the nickel-titanium composite catalyst comprises the following steps: (1) roasting TiO2 in the presence of a reducing gas to obtain an intermediate; and (2) mixing and heating the intermediate obtained in the step (1) and a Ni precursor solution, and roasting in the presence of reducing gas to prepare the nickel-titanium composite catalyst. The preparation method of the catalyst provided by the invention has the advantages of easily available raw materials, simple process and easiness in industrialization. By changing the particle size of the TiO2 carrier, the interaction between metal Ni / TiO2 can be effectively adjusted, then the Ni / TiO2 photo-generated charge separation efficiency is adjusted, and finally the selectivity of a carbon dioxide hydrogenation reaction product is adjusted. The catalyst provided by the invention can realize photothermal conversion without an external heating device, and the nickel-titanium composite catalyst can realize strong light absorption under a full spectrum.

The invention discloses a Cu-doped Bi2O2CO3 nanosheet catalyst as well as a preparation method and application thereof, and belongs to the technical field of electrocatalytic carbon dioxide reduction. The preparation method comprises the following steps: 1) uniformly stirring and mixing water, acetic acid and ammonia water in a reaction container to form a mixed solution I, weighing copper nitrate and bismuth nitrate, adding the weighed copper nitrate and bismuth nitrate into the mixed solution I, and stirring to form a mixed solution II; and 2) transferring the mixed solution II into a reaction kettle, putting the reaction kettle into a drying oven for hydrothermal reaction, and after the hydrothermal reaction, naturally cooling, centrifuging, washing, drying and grinding to obtain Cu-doped Bi2O2CO3 nanosheet catalyst powder. The catalyst is obtained through a one-step hydrothermal method and has excellent selectivity and good stability on reduction of carbon dioxide into formic acid through electro-catalysis, the performance is excellent, the preparation method is simple, the cost of raw materials is low, the yield is high, and large-scale production is easy.

The present invention relates to a method for preparing a porous graphitized carbon carrier loaded with a platinum-based catalyst, and belongs to the technical field of fuel cell catalysts. In the currently disclosed technology, the selected carbon carrier is a traditional carbon black material, which limits the formation of the pore structure of the carbon carrier. Therefore, the present invention proposes a method of using a green and environmentally friendly soluble polymer material as a carbon carrier precursor. Through gelation treatment, heat treatment, acid washing and other process designs, platinum-based catalyst particles will grow in situ and disperse in the porous carbon carrier. The porous graphitized carbon carrier designed and prepared by the present invention can have the advantages of high graphitization degree, rich pore structure, strong hydrophilicity, etc.; the platinum-based catalyst loaded on the porous graphitized carbon carrier prepared by the present invention can effectively improve the catalytic activity and stability of the catalyst material.

The invention discloses an Au (at) Pt core-shell structure supported catalyst which comprises a carrier and Au (at) Pt nanoparticles supported on the carrier, the Au (at) Pt nanoparticles are of a core-shell structure, a core layer is Au, a shell layer is Pt, the particle size of the Au (at) Pt nanoparticles is 2-10 nm, the diameter of the core layer is 1-3 nm, and the thickness of the shell layer is 1-7 nm. The invention also discloses a preparation method of the Au (at) Pt core-shell structure supported catalyst and an application of the Au (at) Pt core-shell structure supported catalyst in an alcohol oxidation process. According to the method, the alcohol oxidation catalyst can be prepared only through room-temperature liquid-phase reduction, the process is simple and convenient, the prepared catalyst has a unique core-shell structure and is excellent in catalytic activity and stability, and corresponding carboxylic acid can be obtained through alcohol high-conversion-rate oxidation of a reaction system under the condition that no additional alkali is added.

The invention belongs to the field of catalysts for oxygen production through seawater electrolysis, and particularly discloses a chromium-doped ferronickel sulfide nanorod array material, a preparation method thereof and application of the chromium-doped ferronickel sulfide nanorod array material to oxygen evolution through seawater electrolysis. The material is a chromium-doped ferronickel sulfide grown in situ on a foamed ferronickel substrate, has components of NiFe, Ni3S2 and (Fe, Ni) 3S4, and is of a nanorod array structure. The preparation method comprises the following steps: putting the cleaned foam ferronickel into a solution containing a sulfur source and chromate, and obtaining the chromium-doped ferronickel sulfide nanorod array material by utilizing a hydrothermal method. As an alkaline water and seawater oxidation electrode, the composite material shows extremely excellent catalytic activity and stability, and has potential application value in the aspect of developing a transition metal OER catalyst for electrolyzing seawater to evolve oxygen.

The invention discloses platinum nanoparticles doped with non-noble metals, a preparation method and application thereof, and aims to realize large-scale production and application of platinum-based nanoparticles with high efficiency, low cost and high catalytic activity. In the early-stage preparation process, it is ensured that inert bubbles of the nanoscale are always filled with reaction liquid. According to the invention, sodium bicarbonate is used as a gas generating agent or other ceramic and thin film structures with micro-nano apertures are used as a micro-nano bubble generator, inert gas is subjected to nano bubbling, and nano-scale bubbles generated by circulation not only can enable reactants to be in uniform contact, but also provide a template effect in a nano-particle forming stage; the active surface area of the catalyst is obviously increased. According to the method, the size of the platinum nanoparticles doped with the non-noble metal can be accurately adjusted by strictly controlling the size of the nano bubbles and the reaction conditions. The process provides an important means for optimizing the performance of the catalyst and powerfully supports the macro preparation of the low-cost and high-efficiency catalyst.

The invention provides a pyrite-coated WS2 heterogeneous Fenton composite catalyst as well as a preparation method and application thereof, and belongs to the technical field of organic dye sewage treatment. The method comprises the following steps: carrying out mechanochemical ball milling on nano WS2 and pretreated pyrite to prepare pyrite coated WS2; wherein the mechanochemical ball milling technology can improve the industrial wastewater treatment efficiency and reduce secondary pollution. By controlling the contrast, pollutant concentration and pH value of the catalyst, the prepared composite catalyst shows excellent catalytic activity and stability. The invention provides an effective strategy for solving the self-repairing and recycling problems of the traditional Fenton catalyst in practical application, is expected to be widely applied to the field of industrial wastewater treatment, and promotes the development of an environment treatment technology.

The invention belongs to the technical field of synthesis of organic chemical products through olefin carbonylation, and particularly relates to a catalyst system for ethylene carbonylation reaction. The catalyst system includes a palladium salt, one or more phosphine ligands, and one or more phosphorus (P)-containing compounds as stabilizers; the molar ratio of the palladium to the phosphine ligand to the stabilizer is 1: (1-6): (60-1000). According to the method, the phosphorus (P)-containing compound serving as the stabilizer is introduced to replace the sulfonic acid, direct use and supplement of the sulfonic acid are avoided, the catalytic activity and stability of a catalyst system can be improved, the equipment and process requirements can be reduced, and the method has a good application prospect.

The invention relates to an organic pollutant wastewater treatment technology, in particular to a preparation method and application of a high-entropy ferrite Fenton-like catalyst. The nano high-entropy ferrite is prepared through one-step growth by adopting a low-temperature solvothermal method in a strong alkaline environment, the chemical composition of the nano high-entropy ferrite is (MxCoxNi0. 2Cu0. 2Zn0. 2) Fe2O4, M is Mg and / or Mn, 0 lt, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, and x is less than or equal to 0.2. According to the invention, the catalytic activity and selectivity design of the Fenton-like catalyst is realized by regulating and controlling the chemical composition of the high-entropy ferrite, and the prepared flaky or regular octahedral high-entropy ferrite has higher catalytic activity than a single phase. The synthesis method of the high-entropy ferrite catalyst provided by the invention has the advantages of low preparation temperature, high universality, simplicity and feasibility, simple equipment and the like, and provides a new way and a new idea for application of the high-entropy ferrite material in the fields of catalysis, energy conversion and the like.