16 results about "Molecular oxygen" patented technology

A process and apparatus for the production of maleic anhydride by reacting a mixed gas containing molecular oxygen and a hydrocarbon, usually n-butane, over a suitable catalyst, wherein the maleic anhydride is produced in a tubular catalytic reactor, wherein after recovery of the maleic anhydride product by absorption with an organic solvent and after appropriate treatment steps, the gaseous effluent from the reactor is recycled back to the inlet of the catalytic reactor by compression.

The application discloses an atomic transition metal modified nitrogen-carbon catalyst and a preparation method and application thereof, and relates to the technical field of environmental functional materials.The atomic transition metal modified nitrogen-carbon catalyst is composed of edge-sharp wrinkle nanosheets, and the wrinkle nanosheets comprise an N3C carrier and transition metals uniformly distributed on the N3C carrier in the form of single atoms and atomic clusters.The atomic transition metal modified nitrogen-carbon catalyst is obtained by modifying transition metal atoms on the basis of nitrogen-carbon, constructing a metal active center, increasing the light-heat absorption capacity of the material, and not damaging the inherent morphology of the catalyst, so that the atomic transition metal modified nitrogen-carbon catalyst has high light-heat conversion capacity, can activate active oxygen species by activating molecular oxygen, and can realize efficient light-heat catalytic inactivation of pathogenic microorganisms by combining the physical and chemical synergistic effects of the sharp edges of the material.

The application provides a method for improving the stability of water-soluble active substances. The method comprises mixing a solution containing water-soluble active substances, ethanol, ammonia, cetyltrimethylammonium bromide, tetraethyl orthosilicate and a reducing agent, performing hydrophobic treatment after reaction, and then dispersing in an oil phase for storage. The water-soluble active substances are wrapped in mesoporous silica by a specific process, the surface and mesoporous channels of the silica are modified by hydrophobic treatment, and then the silica is dispersed in an oil phase, so that the water-soluble active substances can avoid contact with external stimulating factors such as water molecules, oxygen and metal ions, thereby effectively improving the stability of the water-soluble active substances in long-term storage and further widening the application range of the water-soluble active substances.

This invention relates to the field of bioremediation technology for environmental pollutants, specifically to a method for degrading side-chain-less polycyclic aromatic hydrocarbons (PAHs) using the dual-oxygenation function of polycopper oxidases. This invention is the first to discover and demonstrate that polycopper oxidases, without the need for exogenous mediators, possess the ability to catalyze the dual-oxygenation reaction of side-chain-less PAHs, directly adding two oxygen atoms from molecular oxygen to the aromatic ring of PAHs to generate the corresponding dihydroxylated intermediate. Under further catalysis by polycopper oxidase, this intermediate selectively undergoes ring-opening cleavage at specific carbon-carbon bonds in the aromatic ring via a free radical mechanism, ultimately generating low-toxicity, readily bioavailable monobenzene ring or straight-chain ester compounds. The method provided by this invention is mild, environmentally friendly, and achieves thorough degradation, offering a highly efficient and green new technology for the bioremediation of PAH-contaminated soil, water bodies, and industrial waste.

The present invention is a combustion system comprising a unit (3) for producing an oxidizing gas (GC), a combustion device (1), a condensation unit (4) for condensing the combustion fumes (F;F') by contacting the combustion fumes (F;F') with at least one cooling liquid (L), recycling means (5) and a unit (6) for providing molecular oxygen. The oxidizing gas production unit (3) is capable of supplying the combustion device (1) with the oxidizing gas (GC) resulting from the mixing of molecular oxygen with the recycled portion (GDR) of the dehumidified gas (GD). The combustion system further comprises a temperature (T L The gas dehumidifier (GD) comprises a conditioning unit (7) having the function of automatically regulating the dehumidified gas (GDR) and / or means for heating the recycled part (GDR) of the dehumidified gas (GD).

This invention provides a method for producing aliphatic aldehydes in high yield by oxidizing aliphatic primary alcohols having four or more carbon atoms. [Solution] A method for producing an aliphatic aldehyde, comprising the step of oxidizing an aliphatic primary alcohol having 4 or more carbon atoms with molecular oxygen in the presence of an N-oxyl compound and / or an N-oxide compound and a metal-supported catalyst, The metal-supported catalyst includes a metal supported on an inorganic support, A method for producing an aliphatic aldehyde, wherein the N-oxyl compound and / or N-oxide compound is one or more selected from the group consisting of compounds represented by general formula (I), compounds represented by general formula (II), and compounds represented by general formula (III). [Formula 1] JPEG2026104778000025.jpg37124

The application provides a method for preparing naphthoquinone compounds by selectively oxidizing naphthyl aromatic hydrocarbons with molecular oxygen, and belongs to the technical field of fine chemicals. The method uses Co-based catalysts to selectively oxidize naphthyl aromatic hydrocarbons with molecular oxygen to prepare naphthoquinone compounds in the presence of fatty ethers or fatty aldehydes. The Co-N-C composite material used in the method is obtained by mixing an inorganic metal salt and an organic nitrogen-containing compound to obtain a precursor, and then calcining the precursor in an inert atmosphere at a certain temperature. The conversion rate of naphthyl aromatic hydrocarbons is more than 80%, and the selectivity of naphthoquinone compounds is more than 75%. The application uses molecular oxygen as an oxidant, and the catalytic reaction conditions are relatively mild and the reaction is safer. In the oxidation system, the naphthyl aromatic hydrocarbons mainly undergo C-H bond oxygenation reaction on the naphthalene ring, which is a new system for synthesizing naphthoquinone compounds.

This invention provides a method for producing aliphatic aldehydes in high yield by oxidizing aliphatic primary alcohols having four or more carbon atoms. [Solution] The present invention is a method for producing an aliphatic aldehyde, comprising the step of oxidizing an aliphatic primary alcohol having 4 or more carbon atoms with molecular oxygen in the presence of an amine compound and a metal-supported catalyst, wherein the metal-supported catalyst contains a metal supported on an inorganic carrier, and the amine compound is a compound represented by general formula (I). JPEG2026104782000016.jpg15159

This invention relates to a Pd1+AuPd / CeO2 synergistic catalyst and its application in the oxidation of 5-hydroxymethylfurfural, specifically a Pd1+AuPd / CeO2 synergistic catalyst with spatially separated dual active sites and its application in the oxidation of 5-hydroxymethylfurfural. This catalytic system simultaneously constructs Pd1-O2 on a cerium oxide support. v The -Ce single-atom sites and AuPd alloy particle sites, the former for efficiently activating molecular oxygen and the latter for promoting the hydroxymethyl dehydrogenation reaction, are spatially separated but functionally synergistic, significantly reducing the reaction energy barrier and accelerating the reaction kinetics. This catalytic system achieves high conversion and high selectivity of FDCA generation under mild conditions, and maintains good stability and applicability under high substrate concentration, scale-up, and continuous flow conditions.

This invention provides a method for producing aliphatic aldehydes in high yield by oxidizing aliphatic primary alcohols having four or more carbon atoms. [Solution] A method for producing an aliphatic aldehyde, comprising the step of oxidizing an aliphatic primary alcohol having 4 or more carbon atoms with molecular oxygen in the presence of a phenol derivative and a metal-supported catalyst, wherein the metal-supported catalyst includes a metal supported on an inorganic carrier. A method for producing an aliphatic aldehyde, wherein the phenol derivative is a compound represented by general formula (I). JPEG2026104779000037.jpg27159

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.

The application belongs to the technical field of molecular sieve catalysis and fuel cleaning, and particularly relates to a CoO x @Ti-SPP catalyst and a preparation method and application thereof. The CoO x @Ti-SPP catalyst is prepared by using Ti containing self-pillared pentasil (Ti-SPP) with a nanosheet self-supporting structure and a four-coordinated titanium site as a carrier, and loading CoO x active species. The CoO x active species can be highly dispersed on the surface of the Ti-SPP carrier and in-situ form stable Co-Ti synergistic active centers with the framework Ti sites, so that the molecular oxygen activation capacity of the catalyst is greatly improved. The CoO x @Ti-SPP catalyst exhibits excellent catalytic oxidation desulfurization activity on high steric hindrance and difficult to degrade thiophene sulfides in a reaction system taking air as an oxidant and trace N-hydroxy phthalimide or tert-butyl hydroperoxide as an initiator, and simultaneously has good cycle stability and recyclability.

The present invention relates to a process of hydrothermal liquefaction capable of generating a liquid stream rich in renewable molecules, with a lower oxygen content, lower percentage of water and lower acidity in comparison to other products from biomass conversion thermochemical processes. In order to carry out said process efficiently, a catalyst was developed, obtained from the calcination of castor bean hulls, for use in the biofuel sector aiming to provide an environmentally friendly alternative for the production of fuel.

This invention relates to a method for preparing isopentenal and isopentral, the method comprising the steps of: (a) contacting a gaseous reactant stream containing isopentenol, isopentol, and optionally isopentral with a silver-containing heterogeneous catalyst in the presence of molecular oxygen to obtain a product stream containing isopentenal, isopentenal, and isopentral; (b) separating isopentenal, isopentenal, and isopentral from the product stream; (c) isomerizing isopentenal contained in the mixture obtained in step (b) to isopentenal; and (d) separating isopentenal and isopentral from the mixture obtained in step (c). Isopentral can be produced simultaneously with isopentenal and isopentenal in a high yield and with high selectivity in an energy-efficient manner in a single production facility.

The application discloses a preparation method of carbon nitride nanosheet for realizing efficient activation of molecular oxygen through exciton effect regulation, and application of the carbon nitride nanosheet in deep degradation treatment of organic dye wastewater, and belongs to the technical field of photocatalytic material preparation and water pollution control. The preparation method of the carbon nitride nanosheet comprises the following steps: taking melamine as raw material, calcining at a constant heating rate in an air atmosphere to obtain a calcination product; and performing water washing and drying on the calcination product to obtain the carbon nitride nanosheet containing oxygen substances. The innovative regulation method not only overcomes the defect of electron-hole recombination, but also realizes efficient activation of molecular oxygen, so that the practical application value of the carbon nitride in printing and dyeing wastewater treatment is improved. The technology not only improves the photocatalytic performance of the carbon nitride and reduces energy consumption, but also provides a more efficient, economical and environmentally-friendly solution for wastewater treatment.

This application discloses a highly selective method for preparing hexonic acid. This method uses hexuronic acid as a substrate and prepares hexonic acid through a three-step process of esterification, oxidation, and hydrolysis. The first step involves protecting the hydroxyl groups on hexuronic acid with an organic acid / anhydride. The second step uses molecular oxygen as an oxygen source to oxidize hexuronic acid to hexonic acid ester under the synergistic catalytic oxidation of metal ions and halogens. The third step hydrolyzes the hexonic acid ester to obtain hexonic acid. This invention offers high selectivity and is environmentally friendly, providing a novel method for the preparation of hexonic acid.