81 results about "Molecular oxygen" patented technology

The application discloses a lanthanum-cobalt composite catalyst and a preparation method and application thereof. The lanthanum-cobalt composite catalyst is composed of La2O2SO4, Co4S3 and Co3O4. Co(NO3)2.6H2O, La(NO3)3.6H2O, urea and sodium dodecyl sulfate are dissolved in an isopropyl alcohol solution to form a reaction solution, a precursor is obtained through a solvothermal method, and the lanthanum-cobalt composite catalyst is prepared through calcination. The prepared catalyst is used for selectively oxidizing ethylbenzene into acetophenone under the condition that molecular oxygen is used as an oxidant and no solvent is used, and excellent catalytic performance is shown. The catalytic system meets the requirements of green chemical industry and sustainable development.

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 relates to the field of thermal catalysis, and discloses a method for preparing 1-cyclohexylbenzene hydrogen peroxide by solvent-free thermal catalytic selective oxidation of cyclohexylbenzene with molecular oxygen. The method uses a metal bromide as a catalyst, azobisisobutyronitrile or t-butyl hydroperoxide as an initiator, and pure oxygen as an oxidant, and can effectively selectively oxidize cyclohexylbenzene (CHB) into 1-cyclohexylbenzene hydrogen peroxide under normal pressure, solvent-free conditions and at a temperature above 90 DEG C. The catalytic system has the advantages of low cost, simple operation process, high catalytic oxidation efficiency and high selectivity of the target oxidation product.

The invention discloses a preparation method and photocatalytic application of a metal viologen derivative framework for catalyzing C-H bond activation oxidative coupling, and belongs to the technical field of photocatalytic materials. In the preparation method, Zn < 2 + > is selected as a metal node, a viologen derivative with an excellent oxygen activation function is selected as a ligand, and a metal viologen derivative framework Zn-bcbpy is obtained through coordination by a solvent evaporation method. The viologen derivative can effectively activate molecular oxygen to generate superoxide free radicals, and then selective activation of C-H bonds is achieved through a hydrogen atom transfer mechanism. Through optimization of reaction conditions, under irradiation of blue light, the reaction yield of the Zn-bcbpy catalytic substrate is 55%, the Zn-bcbpy catalytic substrate can be stably recycled for five times, and good photocatalytic response performance of the catalyst is proved through electrochemical and impedance experiments.

The invention belongs to the technical field of organic synthetic chemistry, and discloses a preparation method of an aromatic ketone compound, which comprises the following steps: by taking an unsaturated carbonyl compound obtained by condensing aryl acetaldehyde / acid and aldehyde / ketone molecules as a precursor, carrying out a reaction on the unsaturated carbonyl compound in the presence of a free radical precursor and molecular oxygen under the conditions of illumination and / or heating to obtain the aromatic ketone compound. And carrying out free radical mediated decarbonylation functionalization reaction in an organic solvent to obtain the aromatic ketone compound. The functional group contained in the free radical precursor is introduced to the alpha position of the ketone compound. By improving reaction participants and a reaction mechanism, the aromatic ketone compounds with various structures can be efficiently and highly selectively constructed in one step, the functionalization of the alpha position of the aromatic ketone compounds is synchronously realized, and the preparation method which is simple and convenient to operate, high in atom economy, green and environment-friendly is provided for the aromatic ketone compounds; the obtained compound is especially applicable to the fields of drug synthesis and synthesis of other materials.

The present disclosure provides a process. In an embodiment, the process includes introducing an antifoulant into an ethylene feed of a reactor system. The reactor system includes the ethylene feed, a hyper-compressor, a preheater and a polymerization reactor. The ethylene feed is located upstream of the hyper-compressor. The antifoulant consists of an inhibitor, molecular oxygen, and optionally a solvent. As the ethylene feed is located upstream of the hyper-compressor, the process includes introducing the antifoulant into the ethylene feed upstream of the hyper-compressor. The process further includes adding a free radical initiator to the polymerization reactor. The process further includes polymerizing the ethylene in the polymerization reactor under high pressure free-radical polymerization conditions, and forming an ethylene-based polymer.

The invention belongs to the technical field of environmental functional material preparation, and discloses a method for preparing a Cu-coated Cu2O-coated C net by an ethanol-assisted combustion method and molecular oxygen activation application of the Cu-coated Cu2O-coated C net. The cleaned copper net is soaked in ethyl alcohol and then calcined, and the Cu-coated Cu2O-coated C net is obtained after repeated soaking and calcination. According to the optimized net, the local O2 enrichment concentration of the net in an aqueous solution is 2.3 times of the oxygen content in a normal aqueous solution, and the degradation rate constant of ofloxacin reaches 0.178 min <-1 >, which exceeds that of traditional photocatalysis and Fenton-like systems. In addition, the net exhibits gt; gt; gt; gt; gt; the degradation efficiency is 95%, and the method has the feasibility of pilot scale (the cost is 0.001 dollar per liter when 144 L of wastewater is treated), and provides a sustainable example for on-site water remediation. The preparation method disclosed by the invention is simple and easy to implement, relatively short in process and suitable for industrial production and use.

The invention provides a water electrolysis method with an expanded operating range and a related device. The water electrolysis process comprises: recovering a mixture of electrolyte and molecular oxygen from an anode chamber and separating it in a molecular oxygen separator to obtain a molecular oxygen stream and an electrolyte stream containing molecular oxygen; recovering a mixture of electrolyte and molecular hydrogen from the cathode chamber and separating it in a molecular hydrogen separator to obtain a molecular hydrogen stream and an electrolyte stream containing molecular hydrogen; the molecular oxygen containing electrolyte stream and the molecular hydrogen containing electrolyte stream are recycled. Rinsing the molecular hydrogen in the electrolyte fed to the or each cathode chamber upon detection of conditions susceptible to causing the ratio of molecular oxygen to molecular hydrogen in the cathode chamber to be greater than an OTH safety threshold or / and the ratio of molecular hydrogen to molecular oxygen in the anode chamber to be greater than an HTO safety threshold, and / or flushing molecular oxygen in the electrolyte fed to the or each anode chamber.

This invention discloses a flow-through photoelectric synergistic catalytic filtration system for efficiently activating molecular oxygen to remove novel pollutants from wastewater. It possesses multiple advantages, including efficient activation of molecular oxygen, photo-electric synergistic enhancement, and enhanced mass transfer through a flow system, thus facilitating the efficient removal of novel pollutants. The flow-through photoelectric synergistic catalytic filtration system comprises a shell, anode and cathode electrodes, and a separator. The shell contains, in sequence, an anode, a non-woven fabric separator, a cathode, and a sealing ring. The anode is a bismuth oxybromine / carbon nitride / smarium-vanadate photoelectrode, and the cathode is a cobalt-iron two-atom confined carbon nanotube electrode. Its broad-spectrum responsive materials and novel catalyst design significantly improve anti-interference capabilities, adapting to complex water quality and low-concentration pollution scenarios. Novel pollutant wastewater can be efficiently removed in this flow-through photoelectric synergistic catalytic filtration system after being irradiated and electrolyzed in a circulating flow mode. The removal rate of ibuprofen can reach 96% within 2 hours. This invention features a simple design, is easy to operate, has low cost and low energy consumption, and solves the problems of low removal efficiency and high energy consumption in ordinary treatment systems. At the same time, it combines the full spectrum utilization of solar energy and a low catalyst dosage design to further reduce operating costs, demonstrating comprehensive advantages of high efficiency, stability, economy and environmental protection.

This invention provides a method for synthesizing dimethyl 2,5-furandicarboxylate by oxidative esterification of 2,5-furandiethanol using a cobalt-zinc-based carbon material, belonging to the field of catalytic synthesis technology. This method uses 2,5-furandiethanol as a raw material, molecular oxygen as an oxidant, and a cobalt-zinc-based carbon material as a heterogeneous catalyst to prepare dimethyl 2,5-furandicarboxylate via a one-step oxidative esterification reaction in methanol solvent using high-performance liquid phase. The cobalt-zinc-based material is prepared by mixing a certain amount of cobalt salt, zinc salt, and organic nitrogen-containing compound ligand to obtain a precursor, which is then calcined at 500-1100℃ under an inert atmosphere for 0.5-24 h. The oxidative esterification method provided by this invention is mild and efficient, and the catalyst is inexpensive and readily available, making this method highly practical and applicable.

The invention relates to a method for activating molecular oxygen via the prior aggregation of alkene bonds in the liquid phase without any additives or solvents, which allows for the transformation of alkenes into oxiranes with high yield, using air as the only reagent, and occasionally ozone and free radical scavengers to prevent possible degradation.

The invention relates to the technical field of chemical industry, in particular to a method for preparing styrene by oxidative dehydrogenation of ethylbenzene, which comprises the following steps: under the condition of low temperature of 150-300 DEG C, ethylbenzene is contacted with an oxygen storage catalyst in an oxidation state, the catalyst catalyzes ethylbenzene dehydrogenation to generate styrene and hydrogen, and then the hydrogen is selectively oxidized into water by self lattice oxygen, directional movement of reaction balance is realized; the catalyst consuming lattice oxygen is regenerated through oxygen-containing gas flow to recover the oxidation state and is recycled. The oxygen storage catalyst is a composite metal oxide or carbide-oxide composite material with a specific structure, and has the functions of ethylbenzene activation, lattice oxygen storage and release and molecular oxygen activation. The invention also provides two reactor implementation schemes of fixed bed switching and fluidized bed circulation. The problems that traditional high-temperature dehydrogenation is high in energy consumption and limited in selectivity and existing oxidative dehydrogenation uses pure oxygen to cause safety and excessive oxidation are solved, and low-temperature, efficient and safe styrene production is achieved.

Aerobic microbial processes comprise culturing microbes comprising a (per)chlorate respiration pathway in a bioreactor in a bioprocess employing microbial respiration of chloroxyanions as a source of oxygen for the bioprocess, in the absence of external addition of molecular oxygen.

The invention belongs to the field of hydrogen production from waste water of oil and gas fields, and relates to a water quality treatment method and system before purification-free electrolytic hydrogen production from gas field produced water, the gas field produced water firstly enters a coalescence degreaser to carry out double coalescence of wetting and collision on oil components in the gas field produced water, so that oil drops of the oil components are coarsely granulated and adsorbed, and the oil content in water is reduced; then, the gas field produced water enters an ozone catalysis device, and an ozone catalyst in the ozone catalysis device promotes ozone to adsorb organic macromolecules and oxidizes and modifies the organic macromolecules at the same time, so that the organic macromolecules are oxidized and decomposed into small molecules, and the COD content in the water is reduced; and finally, the gas field produced water flows into a two-stage filtering device to remove suspended solids and dissolved solids in the water. Finally, the obtained water quality can meet the application requirements of the purification-free hydrogen production technology, and the purpose of purification-free electrolytic hydrogen production of the produced water is achieved.

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 discloses a high-performance epoxy resin adhesive based on boron trifluoride monoethylamine and a preparation and use method thereof. By adding specific triarylsulfonium hexafluorophosphate in the boron trifluoride monoethylamine epoxy resin system, a protonic acid is generated to act on the epoxy group to generate an activated monomer. The activated monomer and the boron trifluoride monoethylamine synergistically act to effectively avoid the generation of low-molecular oxygen-containing cyclic by-products in the boron trifluoride monoethylamine epoxy resin system, solve the problem of poor mechanical properties of the existing epoxy resin adhesive based on boron trifluoride monoethylamine, and significantly shorten the preliminary curing time of the adhesive due to the action of light, effectively avoid the slippage of the adhesive, and realize the pre-bonding. By adding nano metal, the cohesive energy in the system is reduced, and the adhesion of the epoxy resin adhesive to the metal surface is enhanced. In addition, by optimizing and screening the formula, the proportion of triarylsulfonium hexafluorophosphate and boron trifluoride monoethylamine in a specific range is regulated, the generation of low-molecular cyclic epoxy by-products in the system is maximally inhibited, the complete curing of the epoxy resin adhesive is realized, the epoxy resin adhesive reaches the best mechanical properties, and the problems of poor mechanical properties of the existing epoxy resin adhesive based on boron trifluoride monoethylamine and the like are solved.

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.

The application discloses a PHI / zinc oxide heterojunction photocatalyst and a low-temperature synthesis method and application thereof. The structure of the photocatalyst is that PHI nanosheets grow well on the surface of ZnO and are tightly wrapped with ZnO, forming a sheet-shaped core layer structure, the thickness of the PHI nanosheet is 3-5 nm, and the ZnO is a wurtzite crystal structure. The low-temperature synthesis method comprises the following steps: mixing and heating a PHI precursor and a molten salt to obtain PHI, placing the PHI and a zinc oxide precursor in an aqueous solution, adding an alkali to adjust the pH, and then reacting to obtain the photocatalyst PHI / ZnO. The photocatalyst can be used for activating molecular oxygen to oxidize the C-H bond at the benzyl position of CM to prepare cumene hydroperoxide, and can also be used for a cascade oxidation reaction to form imine and sulfoxide series compounds. The application shows the advantages of the high-activity carbon nitride-based photocatalyst in the field of organic conversion, and provides an important platform for realizing the essence safety, green and efficient oxidation reaction by the peroxide strategy.

The invention discloses a method for characterizing water distribution uniformity of a porous material in water and application, and belongs to the technical field of porous material performance characterization. The method comprises the following steps: 1) constructing a porous material simulation system, inserting water molecules, and starting an NVT ensemble to carry out pre-balancing and finished product simulation; 2) calculating a coordination number function N1 (r) of oxygen atoms of water molecules based on the finished product simulation trajectory, and obtaining a first water molecule density rho1 (r) within a radius r range by combining the sphere volume; (3) subtracting N1 (r) and the sphere volume from the total water molecule number and the total volume of the system respectively, and calculating the second water molecule density rho2 (r) outside the range of r; and 4) calculating the density ratio R (r) = rho1 (r) / rho2 (r), and judging the uniformity according to the mean value of the R (r) within the range from 0.3 nm to half of the minimum side length of the box. The method realizes quantitative evaluation of water distribution uniformity, has the advantages of convenient operation, high quantification precision, wide applicability and reliable data, can be applied to performance evaluation of porous materials such as UiO-67 and graphene, and provides theoretical support for material design optimization in the fields of drying, atmospheric water collection and the like.

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.

A process for manufacturing a coated glass article, said process comprising the following steps in order: (a) providing a glass substrate having a surface, (b) forming a gaseous mixture comprising a source of tin, a source of fluorine, molecular oxygen and water, (c) delivering the gaseous mixture to the surface of the glass substrate, and (d) depositing a coating based on fluorine-doped tin oxide on the surface of the substrate using chemical vapour deposition (CVD), and (e) exposing the substrate to an environment that is under a vacuum and is at a temperature of from 450°C to 750°C for at least 5 minutes.

The application belongs to the technical field of biological medicine, and relates to construction and application of a kind of nano oxygen delivery system based on internal peroxide. The application designs and synthesizes a kind of nano drug which can be used as a molecular oxygen delivery agent. In the nano drug, active molecules are composed of internal peroxide compound and 1,4-diazabicyclo[2.2.2]octane (DABCO), and the two molecules are constructed on gold nanorods to improve water solubility, biocompatibility and targeting of the active molecules. Finally, the active molecule modified gold nanorods obtained by the application can be used to relieve the damage of tissues and organs caused by hypoxia.

A process for manufacturing a coated glass article, said process comprising the following steps in order: providing a glass substrate having a surface, forming a gaseous mixture comprising a source of tin, a source of fluorine, molecular oxygen and water, delivering the gaseous mixture to the surface of the glass substrate, and depositing a coating based on fluorine-doped tin oxide on the surface of the substrate, wherein the coating based on fluorine-doped tin oxide comprises two or more layers based on fluorine-doped tin oxide, wherein the process is carried out using chemical vapour deposition (CVD), and wherein the molar ratio of the source of fluorine in the gaseous mixture during deposition of the layer based on fluorine-doped tin oxide that is directly beneath the outermost layer based on fluorine-doped tin oxide : the source of fluorine in the gaseous mixture during deposition of the outermost layer based on fluorine-doped tin oxide is from 0.01 to 1.5.

This invention provides a method for efficiently producing aliphatic aldehydes 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 ruthenium-supported catalyst, The ruthenium-supported catalyst comprises ruthenium supported on a carrier, The aforementioned support is a porous oxide, The surface area per unit mass of ruthenium is 60 m². 2 / g or more The mesopore volume of the ruthenium-supported catalyst is 0.15 mL / g or more. A method for producing aliphatic aldehydes.

The invention relates to a preparation method of a catalyst for preparing acetyl n-propanol through catalytic oxidation of 2-methyltetrahydrofuran, and belongs to the technical field of catalyst preparation. The preparation method specifically comprises the following steps: dissolving a vanadium-containing compound serving as a main component of the catalyst and oxalic acid serving as a pore-forming agent into deionized water; heating and hydrolyzing the solution to completely evaporate water to obtain a solid; and roasting the solid in an air atmosphere to obtain the catalyst. The prepared catalyst is a catalyst for catalyzing molecular oxygen to oxidize 2-methyltetrahydrofuran to prepare acetyl n-propanol, and a new route for preparing acetyl n-propanol is realized.

The application provides a method for removing acetaminophen by using molybdenum powder to strengthen trivalent iron / tripolyphosphate activated molecular oxygen, in particular, molybdenum powder is used to reduce trivalent iron into divalent iron, and the divalent iron and the tripolyphosphate are used to activate molecular oxygen to remove acetaminophen. The addition of molybdenum powder has obvious advantages for trivalent iron / tripolyphosphate activated molecular oxygen, and the removal rate is greatly improved compared with the case without molybdenum powder, and the treatment efficiency of pollutants is improved. The presence of tripolyphosphate can avoid the precipitation of trivalent iron and divalent iron, and can also strengthen the activation of molecular oxygen. Under the condition of medium alkalinity, the system has strong removal capacity for acetaminophen. The morphology of molybdenum powder before and after the reaction and the cycle experiment show that the molybdenum powder has strong stability in the trivalent iron / tripolyphosphate system and can be reused.

A composition of matter useful for catalyzing an alkene epoxidation reaction using molecular oxygen (O2) as an oxidant. including a plurality of structures comprising nanostructures or microstructures each comprising a coinage metal: and a plurality of single oxophilic metal atoms. The oxophilic metal is characterized by an oxide formation enthalpy being more exothermic than that of the coinage metal. In one or more examples. the oxophilic atom comprises nickel and the coinage metal comprises silver, and a concentration of the nickel increases selectivity to greater than 85% for the epoxidation reaction CH2═CH2+½O2→(CH2)2O over combustion of ethylene forming carbon dioxide. and for an ethylene conversion of greater than 5%.

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).

The invention relates to a vanadium-containing molecular sieve catalyst for preparing acetyl n-propanol through catalytic oxidation of 2-methyltetrahydrofuran and a preparation method, and belongs to the field of vanadium-containing molecular sieve catalysts for catalytic oxidation of 2-methyltetrahydrofuran. The preparation method specifically comprises the following steps: taking a silicon-aluminum-sodium microporous molecular sieve as a precursor, carrying out ion exchange by adopting an aqueous solution of a vanadium-containing compound, washing with water, drying, and roasting to prepare the vanadium-containing molecular sieve catalyst. The prepared catalyst is a catalyst for catalyzing molecular oxygen to oxidize 2-methyltetrahydrofuran to prepare acetyl n-propanol, and a new route for preparing acetyl n-propanol is realized.

The invention belongs to the technical field of photocatalysis, and provides a Fe / LCDs-TCN composite catalyst for removing organic pollutants as well as a preparation method and application thereof.The preparation method comprises the following steps: firstly, preparing carbon nitride TCN by taking melamine and urea as mixed precursors as raw materials; then, TCN is added in the process of preparing CDs and Fe raw material solutions for mixing and heating, the Fe / LCDs-TCN composite photocatalyst is prepared through thermal calcination, and molecular oxygen in air can be efficiently activated to degrade organic pollutants. The Fe / LCDs-TCN composite photocatalyst prepared by the invention has a unique hollow tubular structure, increases active sites, improves the electron transfer rate, has a good energy band structure, not only can activate oxygen to form superoxide free radicals, but also can react with water to generate hydroxyl free radicals and improve the degradation capacity of photocatalysis, does not need additional strong oxidants (PMS and the like), and is suitable for industrial production. An excellent organic pollutant degradation rate can be achieved in a mild air environment and a relatively wide pH range; and the raw materials are low in price, non-toxic and harmless, and excellent in degradation performance, and have very high application value and prospect.