272 results about "Reaction intermediate" patented technology

The invention discloses a compound containing a urea structure as well as a preparation method and application of the compound in a color developing agent, and relates to the technical field of color developing agents. The compound containing the urea structure is a # imgabs0 # structure as shown in a formula 1. The compound containing the urea structure is synthesized through multiple steps of Suzuki reaction, bromination reaction and substitution reaction. The compound is used as an electron donor to be applied to a thermosensitive color development system and forms a color development composition with a phenolic compound and an acidic material, and the activation temperature is as low as 60-120 DEG C. The ureido structure stabilizes a reaction intermediate through a hydrogen bond network, enhances the electron transfer efficiency, and significantly improves the color developing sensitivity; the aryl / heteroaryl substituent optimizes the color contrast through the conjugation effect, and meanwhile, the synergistic effect of the hot-melt filler ensures the stability of the system. Compared with a traditional color developing agent, the color developing agent has the advantages of low-temperature activation, high color developing intensity and excellent weather resistance, is suitable for the fields of thermal printing, anti-counterfeiting materials and the like, and overcomes the defects of high reaction temperature and insufficient stability in the prior art.

The invention discloses a Pt-loaded hierarchical pore HY molecular sieve double-effect catalyst and a preparation method and application thereof.The preparation method comprises the steps that firstly, an acid solution and an HY molecular sieve are mixed, heated and stirred, and the hierarchical pore HY molecular sieve is obtained; then, Pt salt is loaded on the hierarchical pore HY molecular sieve through an impregnation method, and the hierarchical pore HY molecular sieve is dried, calcined and then reduced. The concentration of the acid solution is not higher than 0.1 mol / L; the catalyst is used for hydrocracking of polyethylene or polypropylene. According to the Pt-loaded hierarchical pore HY molecular sieve double-effect catalyst disclosed by the invention, Pt atoms have excellent C-H bond activation capability, meanwhile, the hierarchical pore HY molecular sieve carrier has an open connection mesoporous structure and an acid site, and the mesoporous structure constructed by acid pickling and dealumination is beneficial to diffusion of a reaction intermediate and improvement of the yield of a liquid product; more orifice acid can be exposed by surface erosion, so that the initial cracking of reaction raw materials is facilitated, and the catalytic performance is improved.

The invention discloses a polyarylamine hole transport material, a synthesis method thereof and a perovskite solar cell, and belongs to the field of chemical and energy materials. The synthesis method comprises the following steps: mixing arylamine, aryl halide, a palladium catalyst, a phosphine ligand and organic alkali, carrying out a reflux reaction, and then adding an end-capping reagent to terminate the reaction; and settling the product in methanol, carrying out suction filtration to obtain a solid, and then carrying out Soxhlet extraction. By adjusting the activity of the reaction intermediate, two continuous C-N cross-coupling catalytic cycles are achieved, in the first catalytic cycle, high-reaction-activity arylamine and aromatic halide are coupled to generate a low-activity bifunctional secondary arylamine intermediate, the intermediate is kept in a dormant state in the first catalytic cycle, and after primary arylamine is completely consumed, the intermediate is separated from the primary arylamine, and the secondary arylamine is separated from the primary arylamine. And the secondary arylamine intermediate and the aromatic halide are subjected to coupling polymerization, so that accurate synthesis of a series of polyarylamine with narrow molecular weight distribution is realized. The polyarylamine can be used as a hole transport material to construct a perovskite solar cell, adjust interface hole extraction and promote perovskite growth.

The invention discloses a liquid titanium catalyst as well as a preparation method and application thereof. The liquid titanium catalyst is prepared by reacting tetraisopropyl titanate, organic estersil, hydroxy carboxylic acid, an anti-hydrolysis agent, an antioxidant, phosphate and metal acetate in an alcohol solvent system. The catalyst is prepared by taking a titanium element as a main catalyst to react with hydroxy carboxylic acid in an alcohol solvent, adding organic estersil to introduce a silicon element at the same time, adding an antioxidant, phosphate and another metal acetate into the obtained reaction intermediate to further react, and heating to remove small molecules. The catalyst can be added into a raw material for synthesizing biodegradable polyester directly or after being diluted and dissolved in BDO to be used as a biodegradable polyester catalyst, and a biodegradable polyester product with various excellent performances can be prepared.

The invention relates to a CuKMoS2 / SiO2 catalyst for synergistically preparing methyl mercaptan from carbon dioxide and hydrogen sulfide. By introducing a small amount of copper (Cu) into a KMoS2 / SiO2 catalyst system, the selectivity of the catalyst to a reaction intermediate product methanol (CH3OH) is remarkably improved, so that the generation selectivity to a target product methyl mercaptan (CH3SH) is improved. The introduction of Cu promotes the electron transfer of active sites on the surface of the MoS2 catalyst, and optimizes the reaction path. The invention provides a preparation method of a catalyst with high efficiency, good selectivity and strong stability and a new process applied to methyl mercaptan production.

The invention discloses a p-region metal introduced palladium-based intermetallic compound catalyst and a preparation method and application thereof in the field of electrocatalysts, and the preparation method comprises the following steps: introducing a p-region metal element into metal palladium through a colloid synthesis method to prepare a palladium-based intermetallic compound precursor; and calcining the precursor in a reducing atmosphere to obtain the p-region metal-introduced palladium-based intermetallic compound, which shows significantly improved alkaline HOR performance. The introduction of the p-region metal in the catalyst promotes d-p orbital hybridization and electron interaction, and the catalyst can be used as an electrocatalyst in alkaline hydroxide reaction, and is beneficial to optimization of binding energy of catalytic surface reaction intermediates, so that the alkaline HOR activity is improved, the cost is reduced, and the catalyst variety is widened.

The invention provides a synthesis method of (3-hydroxyadamantane-1-methoxycarbonyl) difluoromethanesulfonate photoacid generator anions, and relates to a photoacid generator anion synthesis method of (3-hydroxyadamantane-1-methoxycarbonyl) difluoromethanesulfonate photoacid generator anions. The preparation method comprises the following steps: S1, uniformly mixing a solvent and difluorobromoacetic acid, then adding CDI, fully stirring, then adding 3-hydroxy-1-adamantane methanol, fully reacting, then adding bicarbonate, carrying out liquid separation to obtain an organic phase A, washing the organic phase A, and carrying out drying and spin-drying; s2, fully mixing the spin-dried substance with NaHCO3, Na2S2O4, acetonitrile and ultrapure water, then carrying out liquid separation to obtain an organic phase B, and carrying out drying and spin-drying on the organic phase B; and S3, dissolving the spin-dried substance in water, then adding an H2O2 solution, carrying out a full reaction, and then carrying out cooling and post-treatment so as to obtain the photoacid generator anions. According to the method, 3-hydroxy-1-adamantane methanol and difluorobromoacetic acid are used as reaction raw materials, esterification reaction is performed under the condition of adding CDI to obtain a first-step reaction intermediate, then acylation sulfonation and oxidation reaction are performed to obtain the target product photoacid generator anion, the reaction process is mild in condition, and the product purity is high.

The invention belongs to the technical field of production, separation and purification of hydroxyl carbazole, and provides a continuous flow production process of hydroxyl carbazole, which specifically comprises the following steps: (1) mixing raw materials of o-halogenated aniline, benzenediol, an organic solvent and an acid catalyst, and pumping into a first reactor for reaction; (2) sequentially performing extraction, reduced pressure distillation, recrystallization and drying treatment on the reaction liquid at the outlet of the first-stage reactor to obtain a reaction product photoreaction intermediate; (3) continuously pumping a mixed solution of the photoreaction intermediate prepared in the step (2), a photoreaction catalyst and a second solvent into a second-stage photoreactor, and carrying out photochemical reaction under the irradiation of a UV-LED light source; and (4) sequentially carrying out neutralization, reduced pressure distillation and recrystallization on the reaction liquid at the outlet of the second-stage photoreactor to obtain a hydroxyl carbazole product. By adopting the technical scheme provided by the invention, various hydroxycarbazole with high yield and high purity can be prepared, and the production period is shortened.

The invention provides a hydrogen fuel cell catalyst as well as a preparation method and application thereof, and relates to the technical field of catalysts, the catalyst comprises an N atom modified carbon carrier and platinum alloy nanoparticles loaded on the surface of the carbon carrier, the platinum alloy nanoparticles are binary or multicomponent alloys formed by Pt and metal M, the molar ratio of platinum to the metal M is (0-10): 1, and the molar ratio of platinum to metal M is (0-10): 1. The weight ratio of the N atom modified carbon carrier to the platinum alloy nanoparticles is (25-80): (75-20). According to the preparation method of the hydrogen fuel cell catalyst, the N-modified carbon-supported PtFe alloy is prepared by a two-step pyrolysis method, so that the use amount of Pt is effectively reduced, the cost is controlled, and the utilization rate of Pt is increased; through the strong coordination capability of the 1, 10-phenanthroline, the formed Fe-N-C layer can restrain the growth and agglomeration of the PtFe alloy nanoparticles, the adsorption to a reaction intermediate is weakened, and the oxygen reduction activity and stability of the alloy catalyst are improved.

The present application provides a kind of for the preparation of C 3+ The application discloses a catalyst for olefin, a preparation method and application, the catalyst is supported by a molecular sieve, and the molecular sieve is MFI molecular sieve or SBA-16 molecular sieve, and the catalyst is loaded with multi-metal, and the multi-metal includes metal tungsten, transition metal and alkali metal. The catalyst is used for providing Lewis acid sites by introducing metal tungsten into MFI molecular sieve or SBA-16 molecular sieve by one-step process, and further selectively introducing transition metal and alkali metal. By selectively coupling hydrogenation-dehydrogenation sites, C-C coupling sites and alkali metal sites in the same multifunctional catalyst, the synergies between the molecular sieve carrier and the multi-metal are realized. The catalyst realizes high-efficiency ethanol-to-C 3+ Olefins conversion in ethanol, with acetaldehyde as the reaction intermediate, and has the advantages of high C 5+ Olefins selectivity.

The invention relates to the technical field of intermetallic compound catalysts, and particularly discloses a preparation method of a hexagonal layered Pt-Bi intermetallic compound nanocrystalline catalyst, which comprises the following steps: weighing octadecene and oleylamine, and mixing to obtain a solution A; platinum acetylacetonate, bismuth acetate, ascorbic acid and hexadecyl trimethyl ammonium bromide are weighed and sequentially poured into the solution A, and a solution B is obtained through mixing and ultrasonic treatment; heating and preserving heat of the solution B, and naturally cooling to room temperature to obtain a turbid liquid C; and measuring cyclohexane and ethanol, sequentially pouring into the turbid liquid C, carrying out ultrasonic treatment at room temperature for 3 minutes, then pouring out supernate, repeating for 2-3 times, collecting a product, and drying to obtain the nanocrystalline catalyst. According to the invention, the electron interaction between bimetallic components is utilized, the electron structure of a catalytic active center is optimized, the interaction between the active structure and reaction active species is enhanced, the evolution kinetics of a plurality of reaction intermediates such as * O and * OOH in the electrocatalytic oxygen reduction reaction can be obviously accelerated, and the kinetics rate of the four-electron oxygen reduction reaction is improved.

The invention discloses a liquid metal-based catalyst with flowable amorphous cobalt active sites as well as a preparation method and application of the liquid metal-based catalyst. The spherical gallium-based liquid metal loaded amorphous cobalt nanosheet material is synthesized by using a sodium borohydride ice bath method. Due to the optimization of the synthesis process, the amorphous cobalt nanosheets are uniformly distributed on the surfaces of the liquid gallium balls, are small in size, are high in utilization rate and are not easy to agglomerate; the intrinsic flow characteristic of the liquid metal gallium realizes the efficient reverse hydrogen overflow effect, optimizes the formation process of a catalytic reaction intermediate, and accelerates the formation of the intermediate. The composite material has the advantages of low overpotential, high Faraday efficiency, high ammonia production rate, good stability and the like during nitrate electrocatalytic reduction reaction, meets the requirements of production and use, and is low in preparation cost.

The invention belongs to the technical field of catalysts, and particularly relates to application of a non-noble metal supported catalyst in catalytic hydrogenation reaction and a method for catalyzing 5-methyl-3-hexene-2-ketone hydrogenation by using the non-noble metal supported catalyst to obtain methyl isopentanone. The invention provides application of a non-noble metal supported catalyst in catalytic hydrogenation reaction. The non-noble metal supported catalyst comprises a composite carrier and an active component supported in the composite carrier, the composite carrier is aluminum oxide and lanthanum oxide, and the active component comprises iron, cobalt, copper or nickel. The non-noble metal supported catalyst provided by the invention can provide catalytic active site density and electron transfer efficiency which are equivalent to or even better than those of a noble metal catalyst under interaction of an active center structure, electronic characteristics and a carrier; meanwhile, the unique d electron orbital characteristic is beneficial to stabilization of a reaction intermediate and reduction of transition state activation energy, so that the catalyst cost is remarkably reduced while the selectivity of catalytic hydrogenation is remarkably improved.

The invention relates to the technical field of electrocatalysts, in particular to a preparation method and application of a cupric borate electrocatalyst.The preparation method comprises the steps that a sodium tetraborate solution is dissolved in water to form a single uniform solution, and a solution A is prepared; copper salt is weighed and dissolved in deionized water to form a single uniform solution, and a solution B is prepared; slowly dropwise adding the solution B into the solution A to form a blue solution C; the solution C is heated and subjected to heat preservation, a reactant is obtained after the reaction is finished and cooled, the reactant is washed and dried, and the copper borate electrocatalyst is obtained; reducing CO2 with different concentrations by using a copper borate electrocatalyst; according to the method, different copper sources are adopted to react with sodium tetraborate, the synthesis temperature and time of the reaction are controlled to obtain copper borate, and borate promotes adsorption of reaction intermediates by adjusting transfer of electrons, so that the capability of electrocatalyzing reduction of CO2 with different concentrations is improved.

According to the catalyst for generating ethylene through electrocatalytic reduction of carbon dioxide, a CuO / SrCO3 heterojunction is synthesized through high-temperature liquid-phase pyrolysis and carbonization, an energy barrier of a reaction intermediate can be optimized through the electron effect of a heterojunction interface carried by the catalyst, efficient adsorption of OCHCHgroups of the reaction intermediate is achieved, and the catalytic activity of ethylene is improved. Further proton coupling of the intermediate is promoted, and finally, a target reduction product C2H4 is efficiently generated; meanwhile, the stability of the structure is guaranteed by a stable heterojunction surface of the heterojunction, so that the heterojunction has excellent durability.

The invention discloses a nitrogen-doped carbon-coated ternary nanoneedle array material, a preparation method thereof and application of the nitrogen-doped carbon-coated ternary nanoneedle array material in electrolysis of hydrazine hydrate, and belongs to the technical field of energy catalysis. The material comprises a substrate, a ternary nanoneedle array growing on the surface of the substrate and a nitrogen-doped carbon material loaded on the surfaces of the ternary nanoneedle array and the substrate, the ternary nanoneedle is composed of any three of iron, cobalt, copper, nickel and manganese. According to the NC-loaded ternary nanoneedle array provided by the invention, enrichment of active sites and enhancement of intrinsic activity are realized through cooperation of NC and the ternary nanoneedle array, and the conductivity of the ternary nanoneedle array can be effectively improved. For a hydrogen evolution reaction and an oxygen evolution reaction, electrons can be quickly transferred between the surface of the catalyst and a reaction intermediate, so that the reaction rate is accelerated. Meanwhile, the coating structure enables water molecules to be adsorbed and activated on the surface of the catalyst more easily by adjusting adsorption energy, so that the HzOR catalytic activity is promoted.

The invention discloses a method for promoting degradation of penicillin antibiotics in a water body. The method comprises the following steps: S1, detecting water quality; s2, medium adjustment; s3, carrying out catalytic degradation; s4, precipitation reaction; medium adjustment is performed on the water body to be treated by using calcium ions and organic matters, so that an example state in the water body to be treated is good, the calcium ions can be coordinated with carbonyl and carboxyl in penicillin molecules, a hydrolyzed reaction intermediate is stabilized, the hydrolysis rate of penicillin antibiotics is increased, and the yield of penicillin antibiotics is increased. The characteristic functional groups such as amino and sulfydryl in the biological metabolism organic matter can also serve as strong nucleophilic reagents to promote rapid hydrolysis of penicillin antibiotics, and meanwhile, through specific setting of the method, it can be avoided that calcium ions and biological organic metabolism media cause secondary pollution to the to-be-treated water body before degradation.

The invention provides a crystallinity-adjustable bismuth-based electro-catalytic nano material and a preparation method and application thereof, and belongs to the technical field of new energy nano materials, the nano material is formed by integrating an amorphous structure and a crystalline structure on bismuth nano particles at the same time, and the expression is a / c-Bi NPs. According to the bismuth nano-particles, oxygen activation is effectively promoted, and the adsorption energy of a key reaction intermediate on the surface of an a / c-Bi NPs catalyst is regulated and controlled, so that the selectivity and the conversion rate of an electrocatalytic reduction oxygen reaction on hydrogen peroxide are improved, and an effective thought is provided for design and application of bismuth-based electrocatalysis with adjustable crystallinity.

The invention provides a Ce / CuO nanoflower-nanowire heterogeneous electrocatalyst as well as a preparation method and application thereof, and belongs to the technical field of preparation of electrocatalytic materials. According to the preparation method disclosed by the invention, Ce modification is carried out on the CuO nanowires, so that the Ce / CuO nanoflower-nanowire heterogeneous electrocatalyst with a large number of oxygen vacancies is obtained; by doping Ce, more oxygen vacancies appear in the catalyst, and an electronic structure is optimized, so that adsorption of an intermediate is promoted; the catalyst is beneficial to activation and dissociation of interface water, can promote generation of active hydrogen and hydrogenation of reaction intermediates, has good application in the field of electro-catalysis nitrate reduction, and has good practicability.

The invention relates to the technical field of preparation of electro-catalysis electrode materials, in particular to a preparation method and application of a SeO2 doped RuO2 electrolyzed water catalyst.The preparation method comprises the steps that S1, ruthenium acetate and selenium dioxide are dissolved in deionized water together and continuously stirred to obtain a mixed solution A, then sodium citrate is dissolved in deionized water, and the PH value is adjusted to be 9 with ammonia water to obtain a solution B; s2, mixing the solution A and the solution B, reacting at 80 DEG C for 12 hours, naturally cooling, ultrasonically washing with deionized water and ethanol in sequence, centrifuging, and drying in a drying oven to obtain a catalyst precursor; and S3, carrying out two-step pyrolysis on the precursor, namely heating to 250 DEG C, annealing for 4 hours, heating to 400 DEG C, annealing and heating for 2 hours, so as to obtain the SeO2-doped RuO2 nanosheet. By introducing a proper amount of SeO2 for doping, the electronic structure of RuO2 is optimized, the adsorption and desorption balance effect of the catalyst on a reaction intermediate is adjusted, the Ru site catalytic performance is improved, and the obtained SeO2-doped RuO2 nanosheet has efficient acidic OER catalytic performance.

The invention discloses a dynamic behavior analysis method and system for kiln high-temperature synthesis, and relates to the technical field of high-temperature material synthesis monitoring, and the method comprises the steps: obtaining time sequence data through a high-frequency temperature sensor, a reaction intermediate detector and a flue gas component monitor, and carrying out the feature extraction; the micro-scale adopts molecular dynamics simulation to obtain local reaction dynamic behaviors, and the macro-scale simulates kiln temperature distribution based on a finite element method; fusing the feedback relationship between the local reaction rate and the temperature distribution by using multi-scale coupling; dividing the high-temperature synthesis process of the kiln into a plurality of continuous recognizable states, judging whether a state jump condition is met or not, and performing multi-objective optimization iteration to obtain a dynamic behavior analysis result and phase change stage judgment. According to the method, dynamic feedback of the reaction rate and the temperature field is realized, key inflection points and phase change characteristics can be accurately captured, the fitting precision of kinetic parameters is remarkably improved, and the robustness and the adaptive capacity of the model are enhanced.

The invention discloses a copper-cobalt alloy / lanthanum hydroxide heterojunction catalyst and a preparation method and application thereof.The preparation method includes the steps that lanthanum-based perovskite oxide LaCu (1-x) CoxO3 is prepared through a sol-gel method, and x is equal to 0.1-0.5; laCu1-xCoxO3 is placed in hydrogen and argon mixed gas for reduction treatment, and the copper-cobalt alloy / lanthanum hydroxide heterojunction catalyst is obtained and used for preparing ammonia through electro-catalysis nitrate radical reduction. According to the preparation method, an in-situ dissolution strategy is adopted, a copper-cobalt alloy / lanthanum hydroxide strong interface coupled heterostructure is constructed, CuCo alloy nanoparticles provide high conductivity and rich active sites and form a heterostructure with La (OH) 3, the d-band center of the active sites is optimized through interaction of strong electrons, NO3 <-> adsorption and reaction intermediate stability are promoted, and the stability of the reaction intermediate is improved. The excellent electro-catalytic performance is realized.

The invention discloses a La and Ca double-doped Co3O4 electrocatalyst and a preparation method and application thereof, and relates to the technical field of electrolyzed water catalysts.The preparation method comprises the steps that a Pt coating titanium mesh (PTL) serves as a substrate and a working electrode, and a Co-LaCa film is deposited on the surface of the substrate and the working electrode by using a self-made target material through a magnetron sputtering method; and washing, drying and calcining the obtained PTL sheet to obtain the catalyst. According to the invention, Ca and La are doped on the surface of Co3O4 to construct a hydrophilic-hydrophobic coupling structure, so that the acidic OER stability is remarkably improved. Ca is introduced to generate high-activity unsaturated Co sites, so that activity and stability are balanced, interface water interaction is promoted, formation and conversion of reaction intermediates are accelerated, the water / catalyst interface microenvironment is optimized at the atomic level, and a new way is provided for improving catalytic stability.

This invention discloses a supported zirconium-based catalyst, its preparation method, and its application. It includes a zirconium-based support and a noble metal supported on the zirconium-based support. The zirconium-based support includes one or more of a zirconium-based composite oxide support and a zirconium-based metal-organic framework material. The zirconium-based composite oxide support includes a composite of zirconium oxide and other oxides, and the other oxides include oxides of one or more elements selected from Si, P, Ce, and Mg. The above-mentioned supported zirconium-based catalyst increases the interaction between the supported noble metal and the support by introducing Si, P, Ce, or Mg into the zirconium-based support to adjust the electron cloud density or oxygen vacancy concentration of the zirconium-based support. By using a zirconium-based metal-organic framework material with regular channels to support the noble metal, reactants and products can diffuse relatively quickly and smoothly, thereby avoiding excessive side reactions and carbon deposition caused by excessive retention of reaction intermediates or products.

The invention discloses a medium-entropy catalyst based on a self-reduction strategy as well as a preparation method and application of the medium-entropy catalyst, and belongs to the technical field of catalysts. The preparation method of the medium-entropy catalyst based on the self-reduction strategy comprises the following steps: jointly dissolving a non-Cu metal salt of which the metal activity is weaker than that of iron, a Cu salt, a metal coordination agent and a surfactant into water to prepare a plating solution, and immersing foam iron serving as a substrate into the plating solution for 10-60 minutes for entropy increase to obtain the medium-entropy catalyst, the molar ratio of Cu to non-Cu metal in the plating solution is (1-2): (1-4). The adsorption / desorption behavior of a reaction intermediate is optimized by cooperatively regulating an electronic structure through multiple elements, and the method has important significance for improving the performance of the NO3RR.

The invention discloses a heterogeneous electrocatalyst with a spine array structure and a preparation method and application of the heterogeneous electrocatalyst, and relates to the technical field of industrial wastewater treatment and purification catalysts, the heterogeneous electrocatalyst comprises a cuprous oxide nanorod substrate, the surface of a cuprous oxide nanorod is provided with nano spine array morphology which is evenly distributed, and the nano spine array morphology is in the shape of a cuprous oxide nanorod. The component of the nanometer spine array morphology is precious metal-copper / cuprous oxide. According to the invention, active sites are exposed to the maximum extent through a spine array structure, nitrate adsorption and electron transmission efficiency are enhanced, and through interface regulation and control of multiple metal components, adsorption energy of a reaction intermediate is optimized, hydrogen evolution competitive reaction is inhibited, and hydrogen evolution efficiency is improved. Therefore, the problems of insufficient exposure of active sites and low mass transfer efficiency of the existing electrochemical nitrate reduction heterostructure catalyst are solved.

The application provides a regeneration method of halogenated nitrobenzene continuous hydrogenation catalyst, and relates to the technical field of fixed bed halogenated nitrobenzene hydrogenation. The regeneration method mainly comprises the following steps: using alcohol, alkali, petroleum ether and ethyl acetate to preliminarily clean the bed layer, removing azo compounds and other pollutants on the surface of the catalyst by using the special properties of ionic liquids, and then completing the regeneration of the catalyst through the steps of pickling, precious metal solution treatment and drying. The application overcomes the defects of the prior art, has the advantages of simple operation, mild conditions and low cost, realizes the in-situ removal of surface impurities such as reaction intermediates and azo compounds on the catalyst surface without damaging the structure of the catalyst and disassembling the catalyst, further supplements the lost metal active components, and can effectively restore the catalyst activity.

The present invention discloses a compound containing a urea structure, a preparation method thereof, and an application in a developer, which relates to the technical field of developers. The compound containing a urea structure has the structure shown in Formula 1. The compound containing a urea structure is synthesized through multiple steps including a Suzuki reaction, a bromination reaction, and a substitution reaction. This compound is used as an electron donor in a thermosensitive color development system and forms a color development composition with phenolic compounds and acidic substances, and the activation temperature is as low as 60 - 120 °C. Its urea group structure stabilizes the reaction intermediate through a hydrogen bond network, enhances the electron transfer efficiency, and significantly improves the color development sensitivity; the aryl / heteroaryl substituents optimize the color development contrast through a conjugation effect, and at the same time, the hot-melt filler synergistically ensures the stability of the system. Compared with traditional developers, the present invention has both low-temperature activation, high color development intensity, and excellent weather resistance, and is suitable for fields such as thermosensitive printing and anti-counterfeiting materials, solving the defects of high reaction temperature and insufficient stability in the prior art.

The invention relates to a preparation method and application of a copper-nickel double-atom modified MXene-based electrocatalyst. According to the method, CuNiDA / MXene is obtained through acid leaching of CuNi / MXene with hydrochloric acid, copper-nickel diatoms with low metal loading capacity are obtained, and residual copper-nickel alloy nanoparticles in the molten salt etching process are successfully converted into the copper-nickel diatoms to be loaded on an MXene substrate in situ; the obtained copper-nickel diatom modified MXene-based electrocatalyst has copper-nickel diatoms coordinated by oxygen functional groups, so that the adsorption of reaction intermediates is enhanced, and the electrocatalytic performance is further improved. The prepared electrocatalyst shows the ammonia yield as high as 59225 [mu] g h <-1 > mg CuNi atom <-1 > and the Faraday efficiency as high as 94.8% in a reaction system for reducing nitrite into ammonia, and has the industrial prospect of green and sustainable synthesis of ammonia.