33results about How to "Improve catalytic stability" patented technology

This invention discloses a two-step hydrothermal method for preparing nickel-iron bimetallic MOF derivatives and its application. By controlling the precursor structure through a two-step hydrothermal strategy, the nickel-iron bimetallic MOF derivative catalyst forms a foam-like hierarchical porous carbon framework. The metal nanoparticles are uniformly dispersed, small in size, and encapsulated by carbon layers, significantly improving the specific surface area and accessibility of active sites. It exhibits excellent hydrogen yield and anti-carbon deposition performance in plastic pyrolysis tar reforming. The synergistic effect of nickel and iron electrons effectively inhibits metal sintering and carbon deposition, and has good catalytic stability. This invention solves the problem in existing nickel-iron bimetallic MOF derivatives where phase separation easily occurs in one-step synthesis due to the difference in nucleation and growth rates between nickel and iron ions and organic ligands, leading to uneven metal distribution, increased particle size, underdeveloped pore structure, and low accessibility of active sites, thus affecting catalytic reforming activity and anti-carbon deposition ability.

The invention discloses a sulfur-tolerant platinum-based catalyst and a preparation method thereof, and the preparation method of the sulfur-tolerant platinum-based catalyst comprises the following steps: weighing roasted ZrO2 as a carrier, weighing ammonium metatungstate, completely dissolving in deionized water, dropwise adding the solution until the carrier is completely immersed, and carrying out ultrasonic treatment; standing at room temperature, drying, and roasting in air at 500-600 DEG C to prepare a tungsten oxide loaded solid acid composite carrier WO3-ZrO2; and weighing chloroplatinic acid, completely dissolving the chloroplatinic acid in deionized water, dropwise adding the solution into the composite carrier, completely immersing the composite carrier, carrying out ultrasonic treatment, standing at room temperature, drying, and roasting in air at 250-350 DEG C to obtain the sulfur-tolerant platinum-based catalyst. The catalyst is simple in preparation method, has relatively strong tolerance to different sulfur species, and has good low-temperature catalytic performance and catalytic stability to low-carbon alkane.

The application provides a self-supporting Ni-Fe-Mn oxygen evolution electrocatalyst and a preparation method thereof, and belongs to the technical field of catalytic material preparation. The Ni, Fe and Mn metal raw materials are repeatedly smelted, and after smelting, suction casting is carried out to obtain a cast plate. The cast plate is subjected to homogenization treatment, and then is cut and polished. Finally, etching is carried out in a nitric acid solution to obtain the self-supporting Ni-Fe-Mn oxygen evolution electrocatalyst. The self-supporting electrocatalyst is prepared by the method of arc smelting, heat treatment and chemical etching, and has the advantages of simple preparation process, easy industrialization, adjustable size, excellent stability and excellent OER performance.

This invention discloses a method and its application for controlling the bending degree of a two-dimensional cobalt four-coordinate conjugated compound on a three-dimensional tubular carbon material. The specific procedure involves ultrasonically dispersing a three-dimensional honeycomb-structured tubular carbon material in methanol, and dispersing the two-dimensional cobalt four-coordinate conjugated compound in methanol. The dispersion of the two-dimensional cobalt four-coordinate conjugated compound is slowly added dropwise to the dispersion of the three-dimensional honeycomb-structured tubular carbon material, while magnetic stirring. The solution is filtered and washed with methanol. Finally, the resulting solid is dried in a vacuum drying oven to obtain a composite structure of the two-dimensional cobalt four-coordinate conjugated compound and the three-dimensional honeycomb-structured tubular carbon material. This invention modifies the bending strain of the two-dimensional cobalt four-coordinate conjugated compound on the three-dimensional honeycomb-structured tubular carbon material by controlling the diameter of the tubular material. The preparation method is simple, efficient, environmentally friendly, and low-cost.

The application discloses a kind of for sweat glucose concentration monitoring method, it is related to sweat monitoring field, comprising the following steps: step 1, enzyme-fixed chain conjugate synthesis: glucose dehydrogenase is reacted with bilirubin oxidase respectively with bifunctional crosslinking agent and is purified, obtain enzyme-crosslinking agent intermediate;It is clicked with azide modified DNA fixed chain chemistry reaction again, and after purification, obtain GDH-fixed chain and BOx-fixed chain conjugate;Step 2, preparation of circular DNA template: after annealing hybridization of phosphorylated template chain and primer chain, it is connected into ring by T4 DNA ligase;Step 3, rolling circle amplification self-assembly package enzyme DNA hydrogel;The present application uses super-flexible DNA hydrogel as flexible electrode material, realizes the efficient fixation and continuous stable catalysis of GDH and BOx, and constructs flexible sweat-based EBFC self-powered sensor as flexible bioelectrode, to realize continuous non-invasive blood glucose monitoring.

This invention relates to the field of nanomaterials, specifically to a metal-organic framework composite material, its preparation method, applications, and a method for oxidative removal of organic sulfur from fuel oil. The composite material comprises Ce-MOF nanomaterials and MnO2 nanomaterials, wherein the weight ratio of MnO2 nanomaterials to Ce-MOF nanomaterials is 1:(13-15). In the X-ray photoelectron spectrum of the composite material, a characteristic peak exists at 530 eV for the O 1s spectrum. The composite material of this invention exhibits good synergistic effects between MnO2 nanomaterials and Ce-MOF nanomaterials, demonstrating excellent catalytic activity and stability.

The application discloses a preparation method of a pyrrolidone derivative. Under the action of a non-precious bimetallic multifunctional catalyst, an acetylenic acid derivative shown in formula I is reacted with an amine, a nitro compound or a nitrile compound shown in formula II in a reaction solvent under the heating and stirring of hydrogen gas to prepare a pyrrolidone derivative shown in formula III, and a reaction formula is as follows: the non-precious bimetallic multifunctional catalyst is a nitrogen-doped carbon-based carrier NC derived from a metal-organic framework material ZIF-8 and an effective active ingredient embedded on the carrier NC; the effective active ingredient comprises two metals, one metal is Co, and the other metal is any one of Ni or Cu. The yield of the pyrrolidone derivative synthesized by the method can reach 77% to 100%. The method has the advantages of simple process, high selectivity of the target product, cleanness and environmental protection, small catalyst consumption, low cost, simple catalyst preparation, high catalytic stability and suitability for industrial production.

This application provides a highly sensitive and interference-resistant microsensor for ethylene monitoring, comprising a housing and a working electrode, a reference electrode, and a protective electrode disposed within the housing. One end of the housing is a detection tip, and the other end is a mounting end. The detection tip is sealed and filled with a breathable membrane layer. The housing is filled with a composite ionic electrolyte. The detection end of the working electrode is coated with a Pd-based doped composite nanolayer, which is applied to the detection end of a platinum wire substrate using a sputtering process. This application, through improvements to the electrode material, nanocoating process, and electrolyte system, effectively enhances the detection accuracy of the microsensor for ethylene detection, achieving nano-molar level accuracy, while also improving its interference resistance, coating stability, and service life.

The utility model discloses a kind of polypropylene catalyst production devices with mixing function belong to polypropylene catalyst production field, including reaction kettle, the inside of reaction kettle is equipped with stirring mechanism, the middle part of reaction kettle is equipped with heating grinding mechanism, the heating grinding mechanism includes two rotatingly connected in reaction kettle heat insulation plate, two the heat insulation plate is rotatably connected by hinge, the upper surface of heat insulation plate is attached with rotating plate;Through the cooperation of each device between above, start servo motor, grinding roller rotates itself, grinding roller is pulverized to gelatin, so that gelatin becomes powder, obtains polypropylene catalyst, not only makes polypropylene catalyst have high dispersibility and controllability, to improve the catalytic activity and stability of polypropylene catalyst, improve the performance of polypropylene catalyst, also make polypropylene catalyst direct grinding, reduce working step, to improve the production efficiency of polypropylene catalyst.

This invention discloses a method for preparing and applying a non-high-temperature pyrolysis metal single-atom catalyst, comprising the following steps: dispersion: dispersing graphene oxide and a transition metal compound in an amide solvent to obtain a graphene oxide dispersion and a metal precursor dispersion; mixing: mixing the graphene oxide dispersion and the metal precursor dispersion, and homogenizing them under physical field-assisted treatment to obtain a mixed precursor suspension; solvothermal reaction: placing the mixed precursor suspension in a closed reaction vessel and performing a solvothermal reaction under autogenous pressure and heating conditions, and cooling after the reaction to obtain an intermediate product containing a metal-graphene hydrogel; purification and drying: washing and purifying the intermediate product with a polar solvent, followed by vacuum drying to obtain a non-high-temperature pyrolysis metal single-atom catalyst; grinding: grinding the obtained non-high-temperature pyrolysis metal single-atom catalyst into powder.

This invention discloses a method for removing bisphenol A from recycled materials, relating to the field of bisphenol A removal technology, comprising the following steps: sorting out recycled polycarbonate materials, washing, drying, and crushing to obtain polycarbonate powder; adding the polycarbonate powder, methanol, and tetrahydrofuran to a reaction vessel, heating and stirring to dissolve, adding a zinc oxide-sodium aluminate catalyst, stirring and reacting at 100-130°C for 30-60 min, cooling, rotary evaporation, washing and filtering, adding deionized water to re-dissolve, heating and mixing, filtering to remove impurities, obtaining a crude bisphenol A solution; adding an iron oxide-cyclodextrin catalyst to the crude bisphenol A solution, stirring and mixing, adding potassium persulfate, reacting at room temperature, obtaining a bisphenol A degradation solution.

The application discloses a kind of basic sulphate load Pt composite material and its preparation method and application in seawater electrocatalytic hydrogen evolution, belong to the preparation technical field of electrocatalytic material.The application is to solve the technical problems of low catalytic activity of existing catalyst, and high cost of noble metal.Method includes:1) preparation basic nickel sulfate carrier;2) preparation Pt source solution;3) soaking;4) electrochemical treatment obtains basic sulphate load Pt composite material.The basic sulphate load Pt composite electrode material prepared by the application shows superior catalytic performance in alkaline conditions and seawater electrocatalytic hydrogen evolution, has excellent electrochemical performance and stability, and will have wide application prospect in the field of electrocatalytic water decomposition electrode material technology.The basic sulphate load Pt composite material electrolytic water catalyst prepared by the method of the application is used in the field of electrocatalytic material technology, and improves hydrogen energy preparation and seawater utilization problem.

The application discloses a kind of pre-transition metal oxide nanoparticles and its preparation method and oxygen reduction synthesis hydrogen peroxide application.The active component of the material is pre-transition metal oxide nanoparticles.Preparation method includes: with soluble pre-transition metal salt and ammonium chloride as raw material, dissolving, evaporating to dryness to obtain mixed precursor, then by calcining at different temperatures in tube furnace to obtain pre-transition metal oxide nanoparticles.The pre-transition metal oxide nanoparticles catalyst prepared can be used for oxygen reduction to prepare hydrogen peroxide, with very high hydrogen peroxide selectivity and excellent stability, greatly improving the energy utilization efficiency.The application has the characteristics of low cost, low energy consumption, simple operation, no security risks, etc., and is suitable for large-scale industrial production.

This invention discloses a method for preparing a ruthenium-doped nickel-iron-based heterostructure catalyst and its application. The preparation method includes the following steps: dissolving oxalic acid and an iron salt in water to obtain an iron precursor solution; placing nickel foam in the iron precursor solution for a hydrothermal reaction to form a nickel-iron-based heterostructure on the nickel foam; and placing the nickel foam with the nickel-iron-based heterostructure in a ruthenium salt solution for an impregnation reaction to obtain the ruthenium-doped nickel-iron-based heterostructure catalyst, wherein ruthenium is doped within the crystal lattice of the nickel-iron-based heterostructure. The ruthenium-doped nickel-iron-based heterostructure catalyst prepared by this invention can be applied to the electrocatalytic water splitting reaction and exhibits good electrocatalytic total water splitting performance.

The application discloses an in-situ growth MOG carbon nanofiber catalyst and a preparation method and application thereof, and comprises the following steps: stirring and mixing a nanofiber polymer and a solvent to obtain a uniform spinning liquid; performing electrostatic spinning to obtain a nanofiber membrane; adding a metal salt, a nitrogen-containing compound and resorcinol into water, slowly adding formaldehyde into the mixed solution to obtain an in-situ growth solution of a metal organic gel MOG; placing the nanofiber membrane into the in-situ growth solution to adjust a pH value, and performing in-situ growth by heating to obtain a MOG nanofiber membrane material; and performing high-temperature pyrolysis of the MOG nanofiber membrane material and urea in an inert atmosphere to dope nitrogen, thereby obtaining the MOG-CNF catalyst. The catalyst can effectively reduce overpotential of ORR and OER reactions, improve catalytic stability, and present stable and excellent dual-function electrocatalytic performance. Through a nano structure and a synergistic catalytic effect, the catalyst has a wide application prospect in the field of fuel cell energy storage and conversion.

This invention relates to a method for preparing and applying a polypyrrole-coated indium-based electrocatalyst. The method includes the following steps: adding carbon nanotubes to an N,N-dimethylformamide solution containing indium nitrate, transferring the solution to a high-temperature reactor, and reacting to obtain In₂O₃ / CNT; placing the In₂O₃ / CNT in an aqueous solution containing pyrrole, and then adding ammonium persulfate to react, thereby obtaining the polypyrrole-coated indium-based electrocatalyst. The polypyrrole-coated indium-based electrocatalyst obtained by this invention exhibits excellent electrocatalytic performance in the reduction of carbon dioxide to formic acid, possessing both high Faradaic efficiency and long-term catalytic stability.

The application discloses a method for rapidly preparing a nanoparticle platinum electrocatalyst by a thermal shock method, and belongs to the field of electrochemical catalysts. The application aims at solving the problems of complex synthesis process, long production period of the existing nanoparticle platinum electrocatalytic electrode material, high energy consumption of hydrogen production by electrolysis of water by the existing industrial application catalyst and poor stability. The method comprises the following steps: 1, pretreatment of a conductive substrate; 2, loading a platinum source on the substrate; and 3, rapid heating. The application is used for the thermal shock method for rapidly preparing the nanoparticle platinum electrocatalyst.

This invention discloses a functionalized MXene-supported metal oxide catalytic material, its preparation method, and its applications. The preparation method includes: fully contacting a pretreated metal substrate with a liquid-phase system containing MXene and metal ions and reacting at high temperature, followed by annealing in air to obtain the MXene-supported metal oxide material; and then subjecting it to electrochemical or chemical treatment to obtain the functionalized MXene-supported metal oxide catalytic material. In the functionalized MXene-supported metal oxide catalytic material of this invention, electron transfer occurs between the functionalized MXene and the metal oxide, promoting the formation of more active sites in the metal oxide that are conducive to catalyst-reactant electron exchange, thereby improving the activity of the oxygen evolution reaction (OER). Simultaneously, the functionalized MXene has abundant surface groups, which can generate strong chemical interactions with the metal oxide, improving the stability of the metal oxide in acidic media.

The application discloses a kind of Ce-La composite carrier load Cu-Ni bimetallic photo-thermal catalyst and its preparation method, for the defects of existing pure carrier oxygen vacancy concentration fixed, active metal is easy high-temperature agglomeration, catalytic activity and stability are insufficient, the Ce-La composite carrier is constructed by La doping modification in the application, and Cu-Ni bimetallic is formed 8Cu2Ni / aCebLa catalyst.La exists in the form of La-Ce-O solid solution, significantly improves the carrier oxygen vacancy concentration and activation capacity, while strengthening metal-carrier interaction, anchoring bimetallic particles to inhibit sintering, improve catalyst stability.

This invention relates to the field of fuel cell technology, and more particularly to an S-RuCr / C composite material, its preparation method, and its applications. The invention involves mixing a ruthenium source, a chromium source, a sulfur source, a hollow carbon sphere support, and a solvent, followed by a hydrothermal reaction to obtain an S-RuCr / C composite material precursor. The precursor is then calcined under a mixed atmosphere of hydrogen and argon to obtain the S-RuCr / C composite material. The preparation method of this invention is simple, as the hydrothermal reaction does not require the high temperatures of solid-state reactions (typically 800–1200°C), meeting the requirements of green chemistry and low energy consumption. Furthermore, it exhibits excellent electrocatalytic hydrogenation performance under alkaline conditions. Therefore, the S-RuCr / C composite material prepared by this invention has promising potential applications in anion exchange membrane fuel cells.

This invention discloses a water slag-based nitrate reduction catalyst and its preparation method, belonging to the field of ammonia synthesis technology. The catalyst preparation method includes pretreating water slag as a support, preparing a copper-cobalt mixed aqueous solution in a specific ratio, and preparing the water slag-based catalyst through co-precipitation, aging, and calcination. By utilizing inexpensive industrial waste residue to replace expensive support materials, combined with a simple co-precipitation process, low-cost and high-efficiency catalyst preparation is achieved, offering advantages such as low cost, simple process, environmental friendliness, and effective utilization of industrial waste residue. The synergistic effect among the components in the catalyst of this invention gives it high catalytic activity and stability, maintaining good catalytic performance under a wide range of reaction conditions.

The application provides an Ir-based high-entropy alloy oxygen evolution catalyst and a preparation method and application thereof, and belongs to the field of high-entropy alloy catalysts. The preparation method can efficiently and simply construct the Ir-based high-entropy alloy oxygen evolution catalyst with high activity, high stability, uniform particle size and uniform distribution. Since the formation of the HEA particle is autocatalytic, i.e. the initially formed metal nucleus catalyzes the further reduction of the solvated metal salt, different metal atoms can be deposited and mixed in the growth process, so that the noble metal Ir and the remaining metals are co-reduced, thereby forming a small-particle-size high-entropy alloy. The high-entropy alloy prepared by the application has a nanosphere shape, the nanosphere particles are dispersed and the element distribution is uniform, and the crystal structure has a similar structure to that of pure Pd, so that the problems of low mass activity and poor stability of the high-entropy alloy catalyst under the acidic working conditions of the PEM anode area can be solved.

The invention discloses a small organic molecule modified composite photocatalyst as well as a preparation method and application thereof. The composite photocatalyst comprises small organic molecules and a photocatalyst containing active vacancies, wherein the small organic molecules can interact with the active vacancies and are embedded into the active vacancies; the active vacancies are generated by carrying out chemical etching treatment on the surface of the photocatalyst; the photocatalyst is an oxide, a sulfide or a nitride, and the composite photocatalyst enhances CO2 adsorption and electron transfer efficiency and improves separation efficiency, so that the catalyst can perform photocatalytic CO2 reduction under sunlight, and shows good catalytic stability under long-term continuous illumination.

This invention belongs to the field of wastewater treatment technology, specifically relating to a Ti3C2T x / / HEP catalyst, ozone composite catalytic packing material, its preparation method and application. The catalyst is composed of MXene sheet support and high-entropy perovskite oxide, and its preparation method is as follows: Ti3C2T x The metal salt is added to the solvent and stirred to obtain a mixture; then the ligand solution is added and stirred to form Ti3C2T. x / MOFs wet gel was dried under multi-gradient vacuum drying to obtain dry gel, which was then ground into powdered precursor; the precursor was calcined under an inert atmosphere and cooled to obtain Ti3C2T x / / HEP catalyst. The ozone composite catalytic packing material of this invention has advantages such as fast electron transfer rate, abundant active sites, high catalytic stability, and low metal leaching, and can be widely used in various industrial wastewaters for the degradation of organic matter.

This invention discloses a metal nanocluster composite electrocatalyst, its preparation method, and its application, belonging to the field of electrocatalyst preparation technology. This invention loads atomically precise Cu8 nanoclusters onto a NiFeS support and innovatively applies a reduction potential in an alkaline solution containing nitrate ions for in-situ electrochemical reconstruction. This achieves precise design and optimization of the catalyst's active interface, overcoming the limitation of traditional sulfide materials relying on oxidation conditions to form the active phase. By utilizing the reduction potential to induce surface reconstruction, the composite material is directly transformed into a highly active and stable catalytic interface under reaction conditions. The prepared metal nanocluster composite electrocatalyst exhibits significantly enhanced nitrate reduction performance in alkaline media, not only greatly improving the selectivity and yield of ammonia and effectively suppressing the hydrogen evolution side reaction and the formation of byproducts such as nitrite, but also maintaining excellent structural and catalytic stability at high potentials.

The application discloses a cobalt-iron catalyst and a preparation method and application thereof. The cobalt-iron catalyst is composed of iron elements, cobalt elements, metal element A and metal element B; the metal element A is at least one selected from Mn, Cu, Zn, Ti, Al, Cr, Ni, Ce and Zr; the metal element B is at least one selected from Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr and Ba; in the cobalt-iron catalyst, the metal elements exist in the form of elements, oxidation states or carbonization states; in the cobalt-iron catalyst, taking the total mass of the metal elements as 100 wt%, the content of the iron elements is 30-99 wt%, the content of the cobalt elements is 30-99 wt%, the content of the metal element A is 0.1-60 wt%, and the content of the metal element B is 0.01-50 wt%.

The application discloses a copper-based compound for electrocatalytic sulfur ion oxidation assisted hydrogen production and a preparation method and application thereof, and belongs to the field of electrochemical catalysis. The method comprises the following steps: S1, dissolving copper nitrate in a solvent under ultrasonic stirring to configure a copper salt solution, immersing pretreated foamed nickel in the copper salt solution to obtain a mixture; S2, sealing the mixture in a stainless steel autoclave with a polytetrafluoroethylene liner, and performing a reaction under heating; S3, after the reaction, cooling to room temperature, cleaning the foamed nickel after the reaction with deionized water, and drying to obtain a product Cu2(OH)3NO3@NF, which solves the problems of existing catalyst deactivation and surface passivation caused by accumulation of elemental sulfur or polysulfides on active sites.

The application belongs to the technical field of water electrolysis catalysts, and relates to a Ru-based water electrolysis catalyst composite material and a preparation method and application thereof. The composite material takes ZIF-8 derived iron and nitrogen atom doped FeNC nanoparticles as an active carrier, loads sub-nano RuFe alloy particles and Fe elemental nanoparticles, and forms a three-active-site uniformly dispersed multi-level composite structure. Through twice dispersion and calcination, the Fe precursor is dispersed in the ZIF-8 skeleton in situ, the Fe atom and the elemental Fe are uniformly dispersed to construct the Fe / FeNC matrix through the first carbonization, the Ru precursor is adsorbed in the pores of the Fe / FeNC matrix, and the RuFe alloy is constructed and dispersed through the second carbonization, and finally the RuFe / Fe / FeNC composite material is obtained. The composite material provided by the application has high efficient hydrogen evolution and oxygen evolution performance, and has full water splitting industrial application potential in a laboratory electrolytic cell and a commercial PEM electrolytic cell.

The application relates to the technical field of carbon monoxide oxidation catalysts, and discloses a noble metal-based carbon monoxide oxidation catalyst and a preparation method and application thereof. The preparation method of the noble metal-based carbon monoxide oxidation catalyst comprises the following steps: preparing M-Mg-Al ternary hydrotalcite, wherein M is at least one of Fe, Co, Ni, Zn, Cu and Cr; calcining the M-Mg-Al ternary hydrotalcite; mixing the calcined hydrotalcite material with a platinum source aqueous solution or a palladium source aqueous solution, and then separating solid materials; calcining the solid materials; and reducing the powder obtained after calcination. According to the noble metal-based carbon monoxide oxidation catalyst, the carbon monoxide oxidation removal process can be stably carried out in the presence of hydrogen sulfide, and catalytic oxidation activity and sulfur-resistant reaction stability can be considered.

The application discloses a supported photocatalyst, a preparation method thereof and application of the photocatalyst in hydrogen sulfide decomposition. x MXene, wherein T x represents surface functional groups -O, -F, -OH) and a semiconductor material cadmium sulfide (CdS) loaded on the surface of the material, namely CdS / Mo2CT x photocatalyst; the photocatalyst directly decomposes hydrogen sulfide in a special quartz reactor filled with the supported photocatalyst to form a micro reaction bed, pure hydrogen sulfide (H2S) gas is introduced, and then the decomposition is carried out under irradiation of a laser; in the process, hydrogen sulfide is decomposed into hydrogen (H2) and sulfur (S). The application has the advantages of simple operation, mild conditions, high decomposition efficiency and the like, and can realize direct decomposition of hydrogen sulfide under the action of light only.