15 results about "Oxidation Activity" patented technology

The present application relates to the technical field of non-noble metal catalysts, and provides a sulfur-doped cobalt-based material with a core-shell porous structure, which has Co nanoparticles as an inner core, and a porous carbon layer containing Co9S8 coated on the surface of the Co nanoparticles. The present application significantly enhances the catalytic capacity of the material by regulating the micro-morphology and surface active site composition and structure of the material through sulfur doping. On the one hand, the metal sulfide obtained by S doping improves the electrical conductivity of the catalyst, and on the other hand, the S element can regulate the microstructure and morphology of the material due to its strong reducing effect, so that S doping is beneficial to promoting the exposure of active sites and the diffusion of target molecule, thereby significantly enhancing the oxygen molecule activation efficiency and improving the benzyl alcohol oxidation activity and selectivity.

The application discloses a high-entropy cluster electrocatalyst and a preparation method and application thereof, and the high-entropy cluster electrocatalyst comprises a supported substrate of graphene oxide nanosheet and high-entropy clusters in a spinel configuration anchored on the surface of the graphene oxide, and the high-entropy clusters comprise a high-entropy spinel oxide structure composed of multiple metals, wherein the metals are more than five kinds of Co, Mn, Ni, Zn, Cu, Cr and Mg. The application realizes anchoring of the high-entropy oxide clusters on the surface of the graphene oxide, and the multi-component synergistic effect and the heterojunction charge optimization characteristics of the high-entropy oxide clusters improve seawater oxidation activity; the high-entropy stability characteristics and the strong carrier interaction promote the seawater oxidation stability of the catalyst, and the catalyst has better alkaline seawater oxidation performance.

This invention belongs to the fields of industrial hazardous waste resource utilization, photothermal synergistic catalytic materials, and VOCs treatment technology. Specifically, it relates to a VN / GaN aerogel photothermal catalyst based on in-situ vanadium nitridation of spent SCR catalyst, its preparation method, and its application. The preparation method includes: selectively leaching vanadium from spent SCR denitrification catalyst; using vanadium-containing DES leachate directly as a vanadium source and spinning aid, compounding it with gallium nitrate and the spinning aid to prepare an electrospinning precursor solution; obtaining precursor fibers through electrospinning; calcining in air to obtain V2O5 / Ga2O3 nanofibers; high-temperature nitriding with ammonia to form VN / GaN composite nanofibers; and ultrasonic dispersion, aging, and freeze-drying to prepare the aerogel photothermal catalyst. This invention achieves green, high-value, closed-loop utilization of vanadium in hazardous waste, and the prepared aerogel catalyst possesses both excellent photothermal conversion performance and toluene catalytic oxidation activity.

This invention provides a titanium dioxide supported catalyst with titanium vacancies, its preparation method, and its application. The preparation method includes the following steps: (1) mixing titanium dioxide raw material with a fluorine-containing etchant and performing etching treatment; separating the resulting mixture into solid and liquid components; and heat-treating the resulting solid to obtain a titanium dioxide support rich in titanium vacancies; (2) mixing an active metal precursor solution with the titanium dioxide support to load the active component; and activating the solid obtained after solid-liquid separation to obtain a titanium dioxide supported catalyst. This invention provides a simple, low-cost, and easily scalable HF etching method for preparing anatase supports rich in titanium vacancies, thereby obtaining a Pd-based catalyst that possesses ultra-high room temperature formaldehyde oxidation activity requiring only room temperature treatment.

The application discloses a modified silane coupling agent and a preparation method thereof, an anti-yellowing dealcoholized sealant and application thereof, and a preparation method of the anti-yellowing dealcoholized sealant. The preparation method of the anti-yellowing dealcoholized sealant comprises the following steps: A100, carrying out dehydration homogenization treatment on alpha, omega-dihydroxypolydimethylsiloxane, dimethyl silicone oil and a filler under a vacuum condition to obtain a first base material; A200, blending and treating a part of a crosslinking agent and the first base material under the vacuum condition to obtain a second base material; A300, providing a modified silane coupling agent, blending and treating another part of the crosslinking agent, the modified silane coupling agent and a catalyst under the vacuum condition to obtain the anti-yellowing dealcoholized sealant. The modified silane coupling agent is prepared by blending a silazane compound with a trimethylsilyl group and a silane compound with a primary amino group and a hydrolysable silicon functional group, which is favorable for reducing the amino oxidation activity and thus improving the ultraviolet resistance, thermal oxygen aging capacity and storage stability of the anti-yellowing dealcoholized sealant.

The application discloses a kind of electric field reinforced catalytic aldehyde removal control methods for formaldehyde efficient removal, it is related to formaldehyde removal technical field, in the purification reactor, pre-adsorption activated carbon block and deep oxidation activated carbon block are oppositely arranged, and opposite reaction cavity is formed between the two;First noble metal catalyst layer and second noble metal catalyst layer are respectively arranged on the surface of pre-adsorption activated carbon block and deep oxidation activated carbon block towards opposite reaction cavity, and activation catalytic reaction zone and mineralization catalytic reaction zone are formed along the flow direction of formaldehyde-containing gas;Through pulse DC power supply, electric field reinforced zone under pulse corona discharge state is formed in opposite reaction cavity, formaldehyde-containing gas is sequentially completed activation and deep oxidation in activation catalytic reaction zone and mineralization catalytic reaction zone after pre-enrichment, can improve formaldehyde removal rate and carbon dioxide selectivity, reduce intermediate product accumulation, and improve continuous operation stability.

The application belongs to the technical field of automobile exhaust purification catalytic materials, and particularly relates to a kind of oxygen defect Pt (111 / 200) composite crystal face atomic level PtM supported rod-shaped La-Al2O3 catalytic materials and its preparation method and application, wherein the catalytic material includes carrier and its supported active ingredient, the carrier is rod-shaped La-Al2O3;Active ingredient is atomic level PtM composite material, Pt and M in it exist in the form of nano-particle, single atom, diatomic and few atom cluster;And Pt exists 111 and 200 composite crystal face;M includes at least one of Pd, Co, Mn and Cu;The carrier and / or active ingredient has oxygen defects.The catalyst improves the molecular activation capacity, low-temperature catalytic oxidation activity and anti-aging stability, and can improve the automobile exhaust catalytic oxidation treatment effect.

The application belongs to the technical field of soil treatment and sewage treatment, and particularly relates to application of 5-methylisoxazole nitrification inhibitor and a method for inhibiting nitrification. The application comprises application in inhibiting nitrification activity of ammonia-oxidizing bacteria and in inhibiting nitrification activity of nitrite-oxidizing bacteria. Through a large number of researches and experiments, the application finds nitrification inhibition activity of 5-methylisoxazole, and realizes full-path regulation of nitrification. Experiments show that the compound can inhibit ammonia oxidation activity of a typical nitrifying strain at a low dose (>=0.01‰w / v), and can effectively inhibit activity of nitrite-oxidizing bacteria at a concentration lower than 0.1‰m / v. The aqueous solution of the compound has a neutral pH, and has no significant inhibitory effect on non-target heterotrophic microorganisms, and has high selectivity and environmental friendliness.

This invention belongs to the field of microbial fermentation engineering technology, specifically relating to a method for targeted screening of superior strains of *Candida virescens* producing long-chain dicarboxylic acids. Targeted screening is achieved through a dual-pressure approach: first, long-chain alkanes are used as the sole carbon source to screen for strains with dominant ω-oxidation activity; then, these strains are transferred to a late-stage dicarboxylic acid conversion fermentation broth containing norlesin, after the removal of alkanes and cell bodies. This fermentation broth simulates a high product concentration, high osmotic pressure, and complex inhibitory environment, allowing for reverse screening of strains with weak β-oxidation capacity and strong production tolerance. This invention utilizes the production fermentation broth as the screening medium, overcoming the technical bias of traditional methods where the screening environment is disconnected from actual production conditions. The screened strains exhibit high yields and strong production adaptability.

The application discloses a titanium dioxide-based catalyst for catalytic oxidation of toluene and a preparation method thereof, and belongs to the technical field of pollution control. The catalyst is prepared by a sol-gel method and comprises a titanium dioxide carrier and a doped metal active component. The active component is in two cases: one is only manganese element, and the molar ratio of manganese to titanium is 5-10:1; the other is that the active component comprises manganese and one second metal element selected from copper, cobalt or cerium, and the molar ratio of the total molar amount of manganese and the second metal element to the molar amount of titanium is 10:1, and the molar ratio of the two is 1:1. The preparation method comprises the following steps: dissolving metal precursors and a titanium source in ethanol to form solutions, mixing and stirring to obtain a gel, and then performing drying and calcination treatment. According to the application, the sol-gel method is used to realize high dispersion of the active component and close combination with the carrier, the prepared catalyst has excellent low-temperature catalytic oxidation activity for toluene, and meanwhile, the catalyst has good stability in a complex atmosphere containing sulfur and water.

This invention relates to a highly efficient active electrocatalyst for furfural oxidation based on electron beam irradiation, its preparation method, and its application. The preparation method includes the following steps: dissolving an aminobenzene precursor and a fluorine-containing precursor in a first organic solvent, performing a hydrothermal reaction, filtering, and dialyzing to obtain a carbon quantum dot stock solution; dissolving the carbon quantum dot stock solution and a carboxylic acid in a second organic solvent to obtain a carbon quantum dot-ligand solution; adding an inorganic salt solution of nickel and iron to the carbon quantum dot-ligand solution, mixing thoroughly, adding triethylamine, irradiating with an electron beam, centrifuging, washing, and vacuum drying to obtain a fluorine-nitrogen-doped carbon quantum dot-NiFe-MOF nanosheet composite material. Compared with existing technologies, the carbon quantum dots in this invention have a dual function as structure regulators and active sites, and electron beam irradiation can produce a radiation etching effect on the product, leading to defects inside the material, thus giving the synthesized fluorine-nitrogen-doped carbon quantum dot-NiFe-MOF nanosheets highly efficient electrocatalytic furfural oxidation activity.

This invention provides a diesel oxidation catalyst, its preparation method, and its application. The preparation method includes: impregnating a CeO2 support in a Pt-containing precursor solution; after impregnation, subjecting the solid product to a first calcination to obtain Pt / CeO2; the Pt-containing precursor solution includes platinum tetraamminenitrate and a solvent. This invention uses the noble metal Pt as the main active component and CeO2 nanorods as the support. Pt is loaded onto the CeO2 support using an impregnation method. By regulating the coordination environment of single-atom Pt through the noble metal precursor, the prepared catalyst exhibits excellent CO and C3H6 oxidation activity. Furthermore, the catalyst synthesis process is simple and maximizes the utilization of noble metal atoms, showing promising prospects for industrial application.

The application discloses an olefin ammoxidation catalyst, a preparation method and application thereof. The catalyst comprises a carrier and an active component, mesopore volume of the catalyst is not less than 0.20 cm 3 / g, a ratio of mesopore specific surface area to micropore specific surface area is not less than 3.00, and total specific surface area of the catalyst is 40-50 m 2 / g. The catalyst is used in propylene ammoxidation reaction, and can maintain high acrylonitrile single-pass yield under high load conditions while having high propylene ammoxidation activity and acrylonitrile selectivity.

This invention provides a hierarchical porous TS-1 molecular sieve, its preparation method, and its applications, belonging to the field of catalysts. The method for preparing the hierarchical porous TS-1 molecular sieve involves directly adding a silanizing agent to a crystallization system to produce a hierarchical porous TS-1 molecular sieve with uniform particle size distribution and high crystallinity. This molecular sieve also features a large specific surface area and large pore volume, and exhibits high selective oxidation activity in macromolecular oxidation reactions. Specifically, this invention uses the synthesized hierarchical porous TS-1 molecular sieve to catalyze the epoxidation reaction of C4-C6 olefins. Results show that the olefin conversion rate is not less than 20%, and the effective utilization rate of hydrogen peroxide is not less than 80%, effectively solving the problems of hindered feedstock diffusion and easy pore blockage in C4-C6 olefin oxidation reactions, thereby improving its catalytic activity and stability.