161 results about "Molecular oxygen" patented technology

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.

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 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 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 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.

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 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.

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.

The invention provides an electrochemical mechanical polishing composition, application and a method, and relates to the technical field of polishing processing. The electrochemical mechanical polishing composition comprises a liquid carrier, a pH regulator, an organic electrolyte and CeO2 abrasive particles, the CeO2 abrasive particles are dispersed in the liquid carrier, after electrification, the surface of the SiC material is oxidized to form a SiO2 molecule oxide layer, the CeO2 abrasive particles can form Ce-O-Si bonds with SiO2 molecules and weaken Si-O-Si bonds among the SiO2 molecules, and the SiO2 molecules are oxidized to form a SiO2 molecule oxide layer. Therefore, the Si-O-Si bond is broken under the action of the CeO2 abrasive particles, and the CeO2 abrasive particles are used for removing and polishing the SiO2 molecular oxide layer, so that the polishing of the SiC material is realized. The electrochemical mechanical polishing composition can realize high-efficiency and high-quality polishing.

The application discloses a kind of ferrocarbonate / biochar composite electrofenton cathode material and its preparation method and application, the composite electrofenton cathode material (Fe3C / BC) is formed by iron-based metal organic framework material and straw mixed calcination, iron-based metal organic framework material accounts for 5% to 20% of straw mass, wherein metal iron mainly exists in the form of Fe3C.The Fe3C / BC electrofenton cathode material of the application only needs one-step hydrothermal and simple mixing grinding calcination to be prepared, the cathode material prepared can not only improve the dispersity and stability of electrofenton active site, while BC good conductivity and molecular oxygen activation capacity, can accelerate the electron transfer in system, promote the generation of active substance, thereby significantly improve the degradation effect of neonicotinoid pesticide pollutants.The electrofenton cathode material prepared by the application has excellent water matrix interference resistance and relatively wide pH and pollutant concentration application range, thus has great application value.

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.

This invention is directed to a method of oxygenating hydrocarbons with molecular oxygen, O2, as oxidant under electrochemical reducing conditions, using polyoxometalate compounds containing copper such as Q10[Cu4(H2O)2(B-α-PW9O34)2] or Q13{[Cu(H2O)]3[(A-α-PW9O34)2(NO3)−]} or solvates thereof as catalysts, wherein Q are each independently selected from alkali metal cations, alkaline earth metal cations, transition metal cations, NH4+, H+ or any combination thereof.

Methods and compositions for treating various indications by lessening oxidative stress in a patient are provided. A pharmaceutical composition comprises between about 0.001% to about 10.0%, or more specifically between about 0.015% to about 5%, sodium iodide or catalase by weight. The iodine ion or the catalase dissociates hydrogen peroxide into water and molecular oxygen to interrupt biological events that result in negative side effects. The pharmaceutical composition further comprises in some cases a reducing agent or various carrier materials. The pharmaceutical composition is in some cases formulated for a variety of delivery methods.

The present invention provides a method for preparing 1,4-naphthoquinone compounds by selective oxidation of aromatic ketones, which is a new method for catalytic oxidation of aromatic ketones to prepare 1,4-naphthoquinone compounds using copper-based and vanadium-based heterogeneous catalytic materials, belonging to the technical field of fine chemicals. This method uses molecular oxygen as the oxidant, and a heterogeneous copper-based and vanadium-based catalytic material to prepare 1,4-naphthoquinone compounds by liquid-phase selective oxidation of aromatic ketones under mild conditions. The Cu-N-C and V-N-C composite materials used therein are obtained by mixing inorganic metal salts with organic nitrogen-containing compounds to obtain a precursor, and calcining in an inert atmosphere at a temperature of 300-800 °C for 0.5-10 h. The method provided by the present invention uses aromatic ketones as raw materials and molecular oxygen as the oxidant, and the catalytic reaction conditions are mild with few pollutants. It is a new route for preparing 1,4-naphthoquinone compounds, with strong practicability and broad application prospects.

The invention relates to a method for producing cyclohexanol and cyclohexanone by cyclohexane oxidation, which comprises the following steps: (1) carrying out molecular oxygen oxidation on cyclohexane under a non-catalytic condition to obtain an oxidation solution containing cyclohexyl hydrogen peroxide; (2) adding a cyclohexyl hydroperoxide decomposition catalyst and a scale inhibitor into the obtained oxidation liquid, carrying out multiple-effect reactive distillation to decompose cyclohexyl hydroperoxide into cyclohexanol and cyclohexanone, recovering unreacted cyclohexane in the step (1), and returning to the step (1); and (3) adding alkali liquor into the decomposition liquid containing 50-70% of cyclohexane obtained after rectification, and carrying out a neutralization saponification reaction to completely convert residual cyclohexyl hydrogen peroxide into cyclohexanol and cyclohexanone so as to obtain an alcohol-ketone mixture. According to the method disclosed by the invention, cyclohexyl hydroperoxide decomposition and cyclohexane recycling are combined into one step, and a large-scale alkali liquor separation process is not needed any more, so that the production efficiency is greatly improved, and the production cost is reduced.

The present invention provides a method for producing a diol having good hue and capable of reducing unsaturated aliphatic hydrocarbons. The diol production method comprises: a) supplying metaboric acid, saturated aliphatic hydrocarbons, and a reaction gas containing molecular oxygen to a reactor; in the presence of metaboric acid, liquid-phase oxidizing the saturated aliphatic hydrocarbons with the reaction gas containing molecular oxygen to obtain a reaction liquid containing an oxide; b) esterifying the oxide to obtain a reaction liquid containing a borate ester compound; c) distilling the reaction liquid containing the borate ester compound to separate it into unreacted saturated aliphatic hydrocarbons and a distillation residue; d) hydrolyzing the distillation residue to separate it into orthoboric acid and an organic layer; e) saponifying the organic layer with alkali to separate it into an alkaline aqueous solution layer and a crude alcohol layer; f) subjecting the crude alcohol layer to a first distillation to remove monohydric alcohol, and subjecting the remaining residual liquid to a second distillation at a temperature below 250°C and a retention time of less than 60 minutes.

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.

Reaction compositions for surface polymer formation may comprise: at least one monomer; at least one ligand and at least one catalyst, wherein the at least one ligand and the at least one catalyst form a complex; at least one solvent; and at least one polymerization control agent for controlling at least one of pH and molecular oxygen concentration. Systems and methods are described which utilize these reaction compositions for forming surface polymers.

The invention discloses a preparation method and application of a ZrO2 / UiO-66-NH2 composite catalyst, belonging to the technical field of photocatalytic materials. Using UiO-66-NH2 as a precursor, a ZrO2 / UiO-66-NH2 composite material is obtained through solvothermal treatment. The uniformly dispersed ZrO2 and UiO-66-NH2 in the composite material form a tight heterojunction, and the large interfacial area provides an efficient channel for photogenerated carriers. In the reaction of photocatalytic oxidation of benzyl alcohol to prepare benzaldehyde, using molecular oxygen as an oxidant, the efficient conversion of benzyl alcohol is realized, and benzaldehyde is the only product. The preparation process of the invention is simple, and it has good economic benefits in the direction of photocatalytic green organic synthesis.