202 results about "Molecular oxygen" patented technology

Systems and methods for producing nitrates, nitric acid, salts thereof, or a mixture thereof are disclosed. The systems may include a feed conduit configured for receiving a feed stream comprising molecular oxygen and molecular nitrogen; an inlet conduit configured for receiving an inlet stream; a plasma reactor fluidically coupled to the inlet conduit, the plasma reactor fluidically coupled to a reactor-outlet conduit configured for receiving the reactor-outlet stream, the plasma reactor configured to produce oxidized nitrogen species; and an absorber fluidically coupled to the reactor-outlet conduit, the absorber configured to receive the reactor outlet stream and to produce nitrates, nitrites, nitric acid, salts thereof, or a mixture thereof from the reactor outlet stream. A recycle conduit may be fluidically coupled to the absorber and the inlet conduit, wherein the recycle conduit is configured to receive the gas-phase stream from the absorber and provide the gas-phase stream to the inlet conduit.

The invention discloses a self-driven bio-electro-Fenton sewage treatment method based on granular sludge electroactivity domestication. The sewage treatment method comprises the following steps: firstly, inoculating anaerobic granular sludge into an anode chamber of a microbial fuel cell, fixing a clustered carbon fiber electrode in a biological anode chamber as an electrode collector, taking a cathode as an oxygen reduction cathode, and performing electrochemical enrichment to obtain electroactive granular sludge; then, preparing an iron-cobalt diatomic catalyst from the nitrogen-doped graphene oxide, cobalt phthalocyanine and iron phthalocyanine; and finally, adding the iron-cobalt diatomic catalyst into the electroactive granular sludge to form a hybrid structure, controlling dissolved oxygen in a reaction system, and degrading organic pollutants by adopting an SBR (sequencing batch reactor). The biological electro-Fenton technology has a better effect of removing refractory organic pollutants, and compared with a traditional electro-Fenton method, the self-Fenton technology can achieve the activity of molecular oxygen without external electric energy input.

A method of increasing bubble stability of a needful high molecular weight bimodal high-density polyethylene resin in need thereof, the method comprising subjecting the needful high molecular weight bimodal high-density polyethylene resin to a determined amount of oxygen tailoring of the resin so as to independently increase both the resin's melt storage modulus G′ (at G″=3000 pascals) and complex viscosity ratio SH1000, and thereby make an oxygen-tailored high molecular weight bimodal high-density polyethylene resin having a targeted increase in bubble stability. The method uses a tailoring effective amount of molecular oxygen (O2) to achieve the desired oxygen tailoring. The method uses these advanced rheological properties from dynamic mechanical spectroscopy, but analyzes the data in a different way that is more sensitive to changes in resin composition and properties, and yet achieves a resin regime having a targeted increase in bubble stability.

An electronic device including a housing having an interior gas space, at least one electronic component positioned within the housing, an environmental control module positioned within the housing, wherein the environmental control module contains a sorbent, and a relative humidity sensor in communication with the interior gas space, wherein the interior gas space is maintainable at a relative humidity of 0% as measured by the relative humidity sensor. The interior gas space may include between about 97% and about 99.9% helium expressed as a molar fraction and at least a portion of the remainder as molecular oxygen. The sorbent can include at least one of a type A zeolite, a type X zeolite, or a type Y zeolite.

The invention belongs to the field of electrochemical gas sensors, and particularly relates to a phenol gas sensor based on quantum dots and a preparation method of the phenol gas sensor. The gas sensor comprises a quantum dot sensing film, polyphenol oxidase on the surface of the quantum dot sensing film and an enzyme stabilizing composite reagent covering the polyphenol oxidase, benzoquinone is formed on the basis that phenol is oxidized through molecular oxygen on the basis of the polyphenol oxidase, the enzyme-substrate efficient specific catalysis effect is achieved, and the content of the polyphenol oxidase in the gas sensor is increased. The polyphenol oxidase-based quantum dot phenol gas sensor is designed. The sensor is high in phenol gas detection specificity and sensitivity.

The invention belongs to the technical field of preparation of novel electrocatalysts, and particularly relates to preparation and application of an angstrom confinement electrocatalyst for selectively activating molecular oxygen to produce hydroxyl radicals. The preparation method comprises the following steps: taking 2H-phase MoS2 as a precursor, loading metal single atoms on the surface of the precursor, and intercalating alkali metal cations; the angstrom confinement catalyst is 1T-phase MoS2 loaded with metal single atoms. The angstrom confinement catalyst provided by the invention is high in three-electron selectivity, can remarkably expose catalytic active sites, accelerates mass transfer of reactants, generates active oxygen species in a penetrating reactor, realizes high hydroxyl radical generation rate and utilization efficiency in an angstrom channel, is simple in preparation method, and has good electrochemical stability. The method lays a foundation for Angstrom confinement catalysis, and reflects the importance of the Angstrom confinement strategy in the design of a high-efficiency catalyst for water pollution control.

Embodiments pertain to a laser arrangement configured for enhancement of an ionizaon process of molecular oxygen by causing a two-photon-based transion followed by a (e.g., disnct) third photon- based transion for ionizing the molecular oxygen. In some examples, the laser arrangement comprises at least one laser source configured to output towards at least one oxygen molecule laser light having mulple wavelengths (WL), as follows: outpu[ng at least one electromagnec (EM) radiaon within a first WL range adapted to cause two-photon-based excitaon of the molecular oxygen into a (e.g., disnct) excited state; and outpu[ng at least one addional EM radiaon that is within a second WL range adapted to cause ionizaon of the molecular oxygen from the (e.g., disnct) excited state.

The invention discloses a method for preparing a solvent soluble component through lignite ozone oxidation depolymerization, and belongs to the technical field of lignite deep processing. The method comprises the following steps: weighing lignite, adding the lignite into acetic acid or water, introducing a mixed gas of ozone and oxygen into a system, and carrying out a stirring reaction at room temperature; and after the reaction is finished, centrifugally filtering the mixture, and collecting a liquid sample. According to the method, the solvent-soluble component is prepared through depolymerization of ozone oxidation lignite, the ozone production cost is low, the oxidation activity is high, accurate regulation and control of the oxidation depolymerization depth of lignite macromolecules can be achieved under the mild condition, the lignite macromolecules are promoted to be directionally converted into the solvent-soluble component under the mild condition, the yield of solvent-soluble substances is high, and the method is suitable for industrial production. And a new thought is provided for clean and efficient utilization of coal.

The present invention provides a method and application for the simultaneous activation of molecular oxygen oxidation and flocculation to remove low-valent phosphorus using an aluminum-carbon-based composite material. The method comprises: placing aluminum powder, a divalent iron salt, and activated carbon pretreated by acid leaching under an inert atmosphere for ball milling to obtain an aluminum-carbon-based composite material; adding the aluminum-carbon-based composite material to wastewater containing low-valent phosphorus and reacting under aerobic conditions. After ball milling, the exposed active zero-valent aluminum can activate molecular oxygen, which synergistically produces strong oxidizing free radicals with the iron salt to oxidize low-valent phosphates into orthophosphates; at the same time, a large number of microscopic primary cells composed of zero-valent aluminum and activated carbon can form local alkalinity on the surface of the activated carbon to promote further dissolution of aluminum, generate flocs and precipitate to remove phosphates, thereby achieving simultaneous oxidation and flocculation removal of low-valent phosphates. The material source of the present invention is wide and low-cost, the material preparation method is simple, the process for removing low-valent phosphorus is efficient and simple, the investment cost is low, and it is easy to apply in engineering.

A method of treating reperfusion injury in a tissue of a subject in need thereof. The method includes applying light, to the tissue, that inhibits electron transfer from cytochrome c to cytochrome c oxidase (CcO) to molecular oxygen to attenuate creation of reactive oxygen species. The light includes wavelengths in a first wavelength range of 730-770 nm and a second wavelength range of 930-970 nm.

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 invention discloses a method for synthesizing α-thiocyanate-β-dicarbonyl compounds using a photocatalytic oxidation strategy, and the specific process is: β-dicarbonyl compounds, thiocyanate and photosensitizer are mixed and dispersed in a solvent, stirred under light source irradiation and air conditions, and the target product α-thiocyanate-β-dicarbonyl compounds is obtained by column chromatography separation or recrystallization after the reaction ends. The effectiveness of the present invention is embodied in that by using cheap and readily available thiocyanate as a thiocyanation reagent, using a green and environmentally friendly photocatalytic oxidation strategy, using molecular oxygen as an oxidant, it is achieved that metal-free, acid-free, alkali-free, and chemical oxidant-free β-dicarbonyl compounds are efficiently α-thiocyanated, and a novel and efficient approach is provided for preparing α-thiocyanated β-dicarbonyl compounds with wide application value. In addition, the reaction post-processing is simple, and the reaction effect can still be maintained when it is amplified to the gram level, with broad production and application prospects.

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 provides a manganese-based mullite catalyst rich in A-site metal defects as well as a preparation method and application of the manganese-based mullite catalyst. The preparation method of the catalyst comprises the following steps: mixing and dissolving rare earth metal salt and manganese salt under a stirring condition, adding organic acid and urea, heating until gel is formed, drying and calcining to obtain the manganese-based mullite catalyst rich in A-site metal defects. According to the invention, a urea-driven NH4 < + > sacrificial substitution method is utilized to selectively etch surface rare earth metal atoms, so that the catalyst with the surface rich in metal defects is formed. The construction of the A-site metal vacancy causes the B-site metal to be more electron-deficient. The limited A vacancy is used as a molecular oxygen activation site, and the oxidized B site is used as a water molecule activation site. The activation of water molecules promotes the hydrolysis dechlorination process, so that Cl in chlorobenzene is accelerated to be separated from the surface of the catalyst in the form of HCl, active site poisoning is avoided, generation of toxic and side products is inhibited, and the catalytic combustion activity and stability of chlorobenzene are greatly improved.

The invention relates to a method for producing acrylic acid, wherein: a product gas mixture containing acrylic acid, water vapor and secondary components is produced by means of a heterogeneously catalyzed gas-phase partial-oxidation of at least one C3 precursor of acrylic acid with molecular oxygen on catalysts in a solid aggregate state at an increased temperature; the product gas mixture is then conducted into a condensation column equipped with fittings which have a separating effect; the product gas mixture is allowed to rise within the condensation column and in the process fractionally condenses, wherein the product gas mixture is separated into: a sump liquid containing secondary products, which are heavier-boiling than acrylic acid, and secondary components, a raw acrylic acid, which contains water and secondary components in an overall depleted state, as the target product, an acidic water also containing acrylic acid and secondary components, and a residual gas mixture containing secondary components which are lower-boiling than water; the target product is conveyed out of the condensation column via a side draw, and the side draw is above the point where the product gas mixture is fed into the condensation column; and the fittings which have a separating effect consist of different stainless steels, and fittings which have a separating effect and consist of a first stainless steel comprising at least 18 wt.% nickel are used in first regions of the condensation column in which the product gas mixture has 5 to 70 wt.% water, 15 to 85 wt.% acrylic acid, at least 8 wt.% acetic acid and at least 2 wt.% formic acid.

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.

An M-NHC catalyst, in which M represents Pd or Pt and NHC represents an N-heterocyclic carbene group, including at least one M atom linked to at least one N-heterocyclic carbene ligand, and the method of using the M-NHC catalyst for selectively preparing oxalates or oxamides, from carbon monoxide, an oxidant, in particular molecular oxygen or air, and an alcohol or an amine respectively, optionally in the presence of a promoter.

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.

The invention relates to a nickel phosphide loaded polytriazine imide composite material as well as a preparation method and application thereof, and belongs to the technical field of nickel-based catalyst materials. The composite material comprises a polytriazine imide carrier and nickel phosphide nanoparticles loaded on the surface of the polytriazine imide carrier, the nickel phosphide nanoparticles are connected with the surface of the polytriazine imide carrier through a nitrogen-nickel chemical bond, and the nickel phosphide nanoparticles and the polytriazine imide carrier are formed by inducing metal-carrier electron interaction between the nickel phosphide nanoparticles and the polytriazine imide carrier. The composite material obtains an organic polymer catalyst with excellent performance of activating and converting molecular oxygen into hydrogen peroxide through metal-carrier electron interaction, and has the advantages of simple and efficient preparation process and the like.

The invention discloses a gold-rhodium heterostructure catalyst and a preparation method and application thereof.The catalyst is of a hamburger-shaped structure and is composed of a carrier and metal particles loaded on the carrier, the metal particles are of a metastable-state gold-rhodium core-shell heterostructure, gold atoms form a shell layer outside the metal particles, and the shell layer is a shell layer outside the metal particles. Rhodium atoms are embedded into an interface between gold atoms and a carrier in a high-temperature reduction mode, and the rhodium atoms form an electronic fence effect region at the interface. The effect can effectively regulate and control the electronic state of gold, and Au can be converted into an Au-state from an Au < m + > state, so that molecular oxygen is remarkably activated, side reactions are inhibited, and the catalytic activity of hydrocarbon selective oxidation reaction is remarkably improved on the premise that selectivity is not affected. In addition, the gold-rhodium heterostructure catalyst also shows excellent stability. The preparation method of the catalyst is simple and easy to implement, has relatively strong controllability, is suitable for selective oxidation reaction of various hydrocarbons, and shows a wide industrial application prospect.

The present invention provides a catalyst for preparing perfluoro-2,3-epoxy-2-methylpentane from hexafluoropropylene dimer, belonging to the technical field of perfluoro-2,3-epoxy-2-methylpentane synthesis. A fluorocarbon cyclic ether compound is added as a reaction medium to a polymerization vessel with an agitator, the reaction vessel is started and stirred, and then the hexafluoropropylene dimer and an oxidation catalyst are added. The polymerization vessel is heated to perform a molecular oxygen oxidation reaction to obtain perfluoro-2,3-epoxy-2-methylpentane. This method effectively improves the efficiency of the molecular oxygen oxidation reaction and the molar yield of perfluoro-2,3-epoxy-2-methylpentane. Both the reaction medium and the oxidation catalyst can be recycled, generating less three wastes, and being environmentally friendly.

The present invention provides a g-C3N4-based nanocomposite material for removing tetracycline, and its preparation method and application. The composite material is prepared by the following method: a sulfur source, a copper source and g-C3N4 are reacted in a solvent at 60-70°C for 1-6h, and then a g-C3N4-based precursor is separated; after drying, the precursor is calcined at a constant temperature of 350-500°C under an air atmosphere to obtain the product. The material of the present invention can utilize green molecular oxygen as an oxidant, and has excellent catalytic performance and adsorption efficiency, high selectivity and stability through the combination of advanced oxidation process and adsorption. Using the composite material, wastewater can be directly used to remove tetracycline without dilution treatment. The present invention is simple to prepare, convenient and fast, and is synthesized using relatively cheap and easily available raw materials. The cost is low, the reproducibility of the sample is relatively good, and it is suitable for large-scale production. It has certain development potential and application prospects in the field of water environment treatment.

In a process for preparing isoprenal and / or prenal by bringing a gaseous reactant stream comprising isoprenol into contact with a silver-containing heterogeneous catalyst in the presence of molecular oxygen to obtain an isoprenal and / or prenal-containing product stream, a weight ratio of formaldehyde to isoprenol of less than 0.04 is maintained in the reactant stream. The process maintains high conversion and selectivity over time and avoids catalyst clogging and pressure drop.

A device for chemical looping combustion of a fuel, operating in the liquid phase and including: a tank receiving a liquid including an oxidizing agent and a reducing agent, an oxidation loop including: a first conduit, a first device for injecting a first motor fluid including dioxygen, configured for introducing the first motor fluid into the first conduit, and a first separating device for separating the first motor fluid from the liquid and for sending the liquid to the tank, a reduction loop including: a second conduit, a second device for injecting a second motor fluid including a fuel that includes carbon, configured for introducing the second motor fluid into the second conduit, and a second separating device, configured for separating the second motor fluid from the liquid.

The present invention belongs to the field of chemical and chemical engineering technology, specifically a method for the continuous cleavage of alcohols into amides using a manganese oxide compound as a catalyst and molecular oxygen or air as an oxidant. The reaction is carried out at 130-150°C for 12 hours in the presence or absence of a solvent to oxidize the alcohols into amides. The catalyst can be recycled and reused at least nine times while maintaining excellent activity and selectivity. The catalyst is simple to prepare, inexpensive, highly selective, and environmentally friendly.

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.