67 results about "Iron catalyst" patented technology

The invention belongs to the technical field of wastewater treatment, and particularly relates to a device and a method for quickly removing refractory organic pollutants by utilizing photoelectric synergy and modified foam zero-valent iron to synchronously catalyze ozone. According to the technical scheme, the device comprises a shell, the interior of the shell is divided into an anode chamber and a cathode chamber through a proton exchange membrane, the shell is provided with a water inlet communicated with the anode chamber and a water outlet communicated with the cathode chamber, and the water inlet is communicated with the anode chamber and the water outlet is communicated with the cathode chamber. An anode material and an LED array are arranged in the anode chamber, a cathode material is arranged in the cathode chamber, and the cathode chamber is further filled with a modified foam zero-valent iron catalyst. The invention provides a device and a method for rapidly removing refractory organic pollutants by utilizing photoelectric synergy and modified foam zero-valent iron to synchronously catalyze ozone.

The application discloses a triphenylmethane polyether dye and a preparation method thereof, and the preparation method comprises the following steps: (1) adding an organic catalyst and an oxidant into a triphenylmethane polyether dye leucoaqueous solution in the interval of 40-60 DEG C, adding an acid-binding agent to maintain a proper pH, and completing oxidation; the organic catalyst is a ferrocene-rotene iron compound; (2) adjusting the pH with an acid-binding agent aqueous solution, removing the organic catalyst by hot filtration, removing water through vacuum distillation of the filtrate, and performing pressure filtration to obtain the triphenylmethane polyether dye. The improved rotene iron catalyst is used in the application, the catalytic effect is obviously improved, the reaction temperature and activation energy are reduced, the defects of excessive hydrogen peroxide oxidation are overcome, and the obtained product meets the EN71-3 standard.

The invention particularly relates to a molybdenum-bismuth-iron catalyst, a preparation method and application thereof and an olefin oxidation method. The general formula of the catalyst component is MoBiaFebXcYdZeQf (Bi4Ti3O12) gOj, wherein X is at least one of an alkaline earth metal element and a group VIII metal element; y is at least one of a VB group metal element, a VIB group metal element and a VA group metal element; z is at least one of alkali metal elements; q is at least one of rare earth elements; the value of a ranges from 0.01 to 0.05; the value of b ranges from 0.1 to 0.5; the value of c ranges from 0.2 to 0.8; the value of d is 0.1 to 0.5; the value of e ranges from 0.01 to 0.03; the value of f ranges from 0.01 to 0.04, and the value of g ranges from 0.5 to 3; and j is the total number of oxygen atoms required for meeting the valence of each element in the catalyst. The molybdenum-bismuth-iron catalyst disclosed by the invention has relatively high reaction activity, can effectively improve the reactant conversion rate, the product selectivity and the target product yield, is particularly suitable for being applied to oxidation reaction, and is particularly suitable for being applied to olefin oxidation.

The invention discloses low-carbon cement, a production method thereof and a low-carbon cement production system, and the production method comprises the following steps: reacting and calcining a cement raw material in the presence of an iron catalyst and a carbon-containing solid to obtain the low-carbon cement. According to the scheme, through an innovative reaction mechanism, an iron catalyst and a carbon-containing solid are introduced into a cement clinker calcination system, direct reaction of calcium carbonate and carbon is realized under specific conditions by utilizing the catalytic action of iron and the reducibility of carbon, and meanwhile, energy gas such as carbon monoxide is generated, so that low-carbon and resource utilization of cement production is realized.

The invention belongs to the technical field of environmental functional materials and soil remediation, and particularly relates to a micron-sized zero-valent iron nitride catalyst as well as a preparation method and application thereof. The invention provides a nitrided micron zero-valent iron catalyst which is prepared by doping micron-sized iron powder with urea, the nitrogen content of the catalyst is 0.5 wt%-4.5 wt%, and the particle size of the micron-sized iron powder is 10-300 microns. The preparation method comprises the following steps: putting raw materials urea and micron-sized iron powder into a ball milling tank, adding grinding balls, and carrying out ball milling for 2-10 hours at the rotating speed of 450-550rpm in an air atmosphere; and drying the product after ball milling is finished, thereby obtaining the product. The catalyst is not only suitable for efficient deep treatment of high-concentration organic contaminated leacheate, but also can be directly used for chemical oxidation remediation of contaminated soil, and has remarkable engineering application value.

This invention relates to a method for preparing a graphene-based coated iron catalyst for the deep removal of trace amounts of acetylene and ethylene impurities from electronic-grade hydrogen chloride, belonging to the field of catalyst technology. The method involves dispersing phenolic resin and graphene quantum dots in toluene, adding allyltrimethylammonium bromide, ferrocene methylamine, and sodium ethoxide, heating and stirring the reaction, and adjusting the pH with acetic acid. Citric acid and ferric acetylacetone are then added, and the mixture is stirred. Sodium borohydride is added in two stages, and the reaction is continued with stirring to obtain a gel precursor. The gel precursor is then ultrasonically dispersed, dried, and subjected to staged heating in a nitrogen-hydrogen atmosphere to obtain the resin-based coated iron catalyst. The catalyst prepared by this invention can effectively remove trace amounts of acetylene and ethylene impurities from electronic-grade hydrogen chloride, improving the purity of electronic-grade hydrogen chloride.

The invention belongs to the technical field of catalysts, and discloses a C2N coated sulfurized zero-valent iron catalyst and a preparation method and application thereof. The catalyst comprises C2N and sulfurized zero-valent iron, and the C2N wraps the surface of the sulfurized zero-valent iron. The method has the advantages that (1) the surface of the sulfurized zero-valent iron is coated with a layer of two-dimensional material C2N, electrons in the zero-valent iron are accelerated to flow to the surface and are in better contact with an oxidant PDS, so that the activation efficiency of persulfate is greatly improved, and chlorinated organic pollutants in underground water are efficiently removed; through the vapor deposition process of C2N precursor pyrolysis, a uniform and ultrathin C2N layer can be formed on the surface of S-ZVI, strong chemical bonding is formed between C2N and the surface of S-ZVI, and an efficient electron conduction channel is constructed. The structural design is beneficial to accelerating migration of electrons in the S-ZVI to the surface, and the activation efficiency of PDS is improved.

This invention belongs to the field of catalyst technology, specifically relating to a supported iron-ruthenium catalyst and its application in the synthesis of m-dichlorobenzene and / or para-dichlorobenzene. The iron-ruthenium catalyst comprises a support and iron and ruthenium supported on the support. The support comprises quaternary ammonium salt-modified diatomaceous earth. Based on the total weight of the catalyst, the mass percentage of iron is 5-15%, and the mass percentage of ruthenium is 3-9%. The abundant active sites on the surface of the quaternary ammonium salt-modified diatomaceous earth support can significantly improve the catalytic activity and selectivity for m-dichlorobenzene and / or para-dichlorobenzene, without the formation of trichlorobenzene. The catalyst lifetime is 5-8 times longer than that of iron catalysts. The product can be separated and purified by stripping, distillation, and crystallization. The process is simple and can obtain high-purity m-dichlorobenzene and para-dichlorobenzene products.

The invention discloses a preparation method of a super-crosslinked polymer supported chiral ferrocene catalyst, and belongs to the technical field of organic chemistry. The preparation method comprises the following steps: in an inert gas atmosphere, dissolving a ligand or a mixture containing the ligand and metal salt in a solvent, stirring at room temperature until the ligand or the mixture is dissolved, then adding an aryl-containing comonomer, and continuously stirring and dissolving to obtain a reaction solution; and adding Lewis acid or Bronsted acid, and carrying out Friedel-Crafts alkylation reaction to obtain the supported chiral ferrocene catalyst. Wherein the ligand is selected from a compound as shown in L1-L12. Compared with a previous covalent bond polymerization method, the loading scheme has the advantages that the catalyst does not need to be modified, and the loading scheme has relatively large application potential aiming at a series of aromatic ring-containing micromolecular catalysts and has the advantages of simplicity, high efficiency and relatively good universality.

The present invention relates to process of alkylating a ketone of the formula (I) with an alcohol of the formula (II) having at least one primary and optionally at least one secondary hydroxyl group in the presence of an iron catalyst of the formula (III).

The invention discloses a nitrogen-doped PVC (polyvinyl chloride) dechlorination carbon-loaded iron catalyst, a preparation method thereof and application of the nitrogen-doped PVC dechlorination carbon-loaded iron catalyst in a polyolefin pyrolysis reaction. The nitrogen-doped PVC dechlorination carbon-loaded iron catalyst is obtained by taking ferric oxide as an iron source, melamine as a nitrogen source and PVC as a carbon source through high-temperature calcination. The catalyst prepared by the invention can realize the pyrolysis of polyolefin in an inert atmosphere at 360 DEG C, and the yield of pyrolysis oil can reach 88% (greater than or equal to C6). The catalyst prepared by the invention can be expanded to pyrolysis of commercial waste polyolefin plastics, and pyrolysis oil with the yield of 80-88% is obtained. Compared with a traditional pyrolysis catalyst, the catalyst is high in catalytic activity, easy to prepare, low in cost, good in stability and easy to recover, and after the activity of the catalyst is reduced, the activity of the catalyst can be recovered through simple high-temperature calcination.

The application discloses a bismuth-nickel-iron composite oxide catalyst, a preparation method and application. A bismuth source, a nickel source and an iron source are dissolved in a mixed solvent of ethanol and ethylene glycol, and then are fully stirred to obtain a mixed solution; oil amine and urea are added into the mixed solution, and after ultrasonic mixing, the mixture is moved to a polytetrafluoroethylene reaction kettle for a solvothermal reaction; after the reaction solution is cooled, the product is washed, dried and calcined, and finally the bismuth-nickel-iron composite oxide catalyst is obtained. The application prepares a spinel nanometer catalyst with stable performance, the NO removal rate of which reaches 90% at 175 DEG C, the denitration efficiency of which is as high as 100% at 225 DEG C, the medium-low temperature denitration performance of which is excellent, and the catalyst has the characteristics of high CO-SCR denitration efficiency and magnetic recyclability. In addition, proper bismuth doping is beneficial to improving the sulfur resistance of the nickel-iron catalyst, and thus the catalyst has a wide application prospect.

The invention discloses a polyolefin efficient catalytic oxidation method, prepared oxidized polyolefin and application. In particular to a method for efficiently catalyzing polyolefin materials such as polyethylene to perform oxidation modification under mild conditions, a functionalized polyolefin material prepared by the method and application of the functionalized polyolefin material in high-valued recovery of composite materials, compatibilizers, degradable materials and the like. In order to solve the problem that the existing polyolefin C-C bond is difficult to efficiently recycle, upgrade and utilize due to strong inertia, the invention provides an efficient polyolefin oxidation method based on a cheap iron catalyst, which can realize high functional group insertion rate (up to 11.46%) under mild conditions and realize surface selective oxidation and gradient structure control. The invention also provides a subsequent chemical modification method of the oxidized polyolefin, which comprises oximation, amidation, crosslinking, fluorophore introduction and the like, and expands the application of the oxidized polyolefin in the fields of degradable materials, compatibilizers, functional materials and the like.

The present application relates to the technical fields of fossil resource recycling and fuel cell catalysts, and particularly to a method for preparing a platinum-iron-carbon catalyst by using waste rubber powder, and a platinum-iron-carbon catalyst and a use thereof. The method in the present application comprises: performing pyrolysis treatment on first waste rubber powder to obtain pyrolytic carbon; mixing the pyrolytic carbon with metal salts, a complexing agent, and water to obtain a first mixture, wherein the metal salts include a platinum salt and an iron salt; heating the first mixture under stirring, so as to obtain a sol; drying the sol and then calcining same to obtain a catalyst precursor; mixing second waste rubber powder with the catalyst precursor to obtain a second mixture; and performing microwave radiation treatment on the second mixture to obtain a platinum-iron-carbon catalyst. The technical solution of the present application provides a simple and low-cost method for preparing a highly active platinum-iron-carbon catalyst, and also realizes high-value recycling of waste rubber.

The invention relates to the technical field of CO oxidation catalysts, in particular to a preparation method of a size-adjustable copper-iron catalyst. The method comprises the following steps: preparing a mixed solution from ferric chloride and ethanol and deionized water in a certain proportion, and mixing the mixed solution with sodium acetate; then, the mixture is subjected to a hydrothermal reaction in a reaction kettle, suction filtration and drying are performed, and the carrier is prepared. Mixing the carrier with an aqueous solution containing a certain amount of copper nitrate, and adding excessive sodium carbonate solution; performing suction filtration and drying to obtain an intermediate product; and finally, calcining the intermediate product to obtain the catalyst. The copper-iron catalyst does not need precious metal, is low in cost, simple in preparation method, controllable in condition and free of generation of strong acid and strong alkali waste liquid, and can be industrially applied on a large scale.

The invention discloses a high-dispersion and high-carbon-deposition-resistance iron catalyst, a preparation method and application of the iron catalyst in preparation of styrene from ethylbenzene, and belongs to the technical field of catalysts. The catalyst takes an aluminum oxide gel network as a framework, and iron, potassium and cerium are embedded in the framework in situ. A sol-gel method is adopted for preparation, an additional binder is not needed, the active component is highly dispersed, and the mechanical strength is high. The catalyst can be directly used for preparing styrene through ethylbenzene dehydrogenation under the condition of no water vapor and shows excellent carbon deposition resistance and operation stability, carbon deposits are easily eliminated through air roasting, and potassium loss can be neglected. Compared with a traditional iron-based catalyst, the catalyst greatly reduces the water-hydrocarbon ratio and energy consumption, has the remarkable advantages of energy conservation and consumption reduction, and is suitable for green upgrading and reconstruction of an industrial ethylbenzene dehydrogenation device.

The invention discloses a method for improving the yield and quality of potassium humate in low-grade coal based on pyrolysis-hydrothermal catalytic humification. The method adopts a three-step synergistic process: firstly, mixing and drying pulverized coal, a persulfate initiator and a concentrated alkali solution, then carrying out pyrolysis humification, then adding a hydrogen peroxide solution into the pyrolysis mixture to carry out Fenton reaction, carrying out solid-liquid separation to obtain a first liquid product and solid residues, adding an iron-based catalyst and a dilute alkali solution into the solid residues to carry out hydrothermal reaction, and carrying out solid-liquid separation to obtain a second liquid product; and adding a hydrogen peroxide solution to carry out secondary Fenton reaction, and carrying out solid-liquid separation to obtain a second liquid product and final solid residues. Liquid products in the two steps are combined to serve as a potassium humate fertilizer, and final solid residues serve as a base fertilizer. According to the method, the humic acid extraction rate is increased to 85% or above from 40-50% of a traditional method, meanwhile, the molecular weight of the product is reduced, the hard water resistance and compounding applicability of the product are remarkably improved, the method is particularly suitable for a drip irrigation fertilization system, and an effective way is provided for high-value utilization of low-grade coal.

The catalytic activity of a spent precious metal-iron catalyst is restored by combining the spent catalyst with an iron(III) compound. This can be done by adding the iron(III) compound to a chemical reaction involving the spent precious metal-iron catalyst. No additional precious metal addition is required. This process is particularly useful in a continuous process for converting nitro compounds, such as nitrobenzene, to the corresponding amines.

This invention discloses a dual-functional material based on steel slag, its preparation method, and its application, belonging to the field of solid waste resource utilization and environmental pollution control technology. The method uses steel slag, a solid waste from the iron and steel industry, as raw material, and prepares an iron-rich catalyst and a calcium-rich adsorbent through selective leaching. The iron-rich catalyst efficiently activates PMS in a photocatalytic persulfate (PMS) system to degrade tetracycline antibiotics in water; simultaneously, the calcium-rich adsorbent can capture CO2 generated during antibiotic degradation in situ, thus achieving multiple objectives of solid waste resource utilization and pollution and carbon reduction. This invention utilizes widely available and inexpensive raw materials and employs a simple process, effectively improving the high-value-added resource utilization level of steel slag and overcoming the carbon emission problems associated with traditional advanced oxidation technologies, providing a new approach for synergistic technologies of wastewater treatment and carbon reduction.

The invention relates to the field of synthesis of novel iron-sulfur cluster compounds and the field of design of biomimetic catalysts. According to the invention, the ligand unfilled-corner cubic alkane iron-sulfur cluster compound is controllably synthesized by utilizing a ligand replacement strategy under an oxidation-reduction condition; as a novel trinuclear iron catalyst, the iron-sulfur cluster compound is highly similar to iron-molybdenum coenzyme in local structure and has the potential of nitrogen activation and ammonia synthesis.

The invention discloses a terpyridyl ferrous catalyst derived from terthiophenes and application of the terpyridyl ferrous catalyst in photocatalysis of CO2. The catalyst has a structure as shown in a formula I. According to the catalyst, a light capture unit terthiophene is integrated to a terpyridyl ferrous catalytic center through molecular design to form an integrated structure with a self-sensitization function, and the preparation method comprises the following steps: condensing 2, 2 ': 5', 2 ''-trithiophene-5-formaldehyde and 2-acetylpyridine under an alkaline condition to obtain a ligand; and coordinating with ferrous chloride to obtain the target catalyst. According to the present invention, in the photocatalytic CO2 reduction reaction, the efficient catalysis can be achieved without the addition of the noble metal photosensitizer, the CO conversion number is up to 642, the selectivity exceeds 98%, and the low-cost and high-activity new scheme is provided for solving the dependence on the noble metal in the prior art.

The invention relates to the technical field of catalyst preparation, and provides an iron catalyst, a preparation method and application thereof, and a method for preparing olefin through carbon dioxide hydrogenation. The iron catalyst comprises an active component and a carrier in a mass ratio of (40-70): (30-60), the active component comprises a composition with a chemical formula of Fe < 100 > A K O < x > (Fe < 4 > N) < c > according to an atomic ratio; wherein A comprises at least one of Mn, Cu and Zn, the value range of a is 10-30, the value range of b is 1-10, the value range of c is 1-8, and x is the total number of oxygen atoms required by valence of each element in the catalyst. The iron catalyst provided by the invention simultaneously contains an iron oxide and an iron nitride, can be used in a reaction for preparing olefin through carbon dioxide hydrogenation, and is beneficial to improving the conversion rate of carbon dioxide and the selectivity of olefin, especially C4 + olefin; and the method is suitable for a fluidized bed reactor, and can effectively solve the problems of difficulty in heat removal, easiness in temperature runaway and easiness in catalyst deactivation in high-temperature Fischer-Tropsch synthesis.

The invention discloses application of a metal catalyst in pyrolysis of polyvinyl chloride and polyethylene glycol terephthalate mixed plastic, and belongs to the technical field of waste plastic recovery. The application method comprises the following steps: putting polyvinyl chloride, polyethylene glycol terephthalate and a catalyst into a reactor, uniformly stirring and mixing, carrying out gas exchange with N2, carrying out pyrolytic reaction at 180-240 DEG C for 5-30 minutes, and after the reaction is finished, carrying out post-treatment to obtain a decomposition product. The efficient catalytic performance of the iron oxide catalyst in PVC / PET pyrolysis is proved for the first time, wherein the iron oxide catalyst has high selectivity, and terephthalic acid and bis (2-chloroethyl) terephthalate with high value can be obtained. The reaction is carried out at 220 DEG C for 7 minutes, and the yield of the PET monomer is up to 88.2%.

The application discloses an electrode material based on a non-haem iron catalyst and a preparation method and application thereof, and belongs to the field of electrocatalytic water treatment. The electrode material is used as a substrate, and an auxiliary ligand polymer layer and a non-haem iron catalyst layer are sequentially deposited on the substrate; the auxiliary ligand polymer layer is polymerized from organic monomers; the non-haem iron catalyst layer is formed by reaction of a ferrous salt and dopamine to form a precursor and then electrochemical polymerization; and the auxiliary ligand polymer layer and the non-haem iron catalyst layer are connected through coordination bonds. The auxiliary ligand polymer layer and the non-haem iron catalyst are electrochemically polymerized on the electrode material, so that the selectivity of the electrode material for electrocatalytic oxygen two-electron reduction to produce hydrogen peroxide is improved, and the hydrogen peroxide yield is increased. In addition, the non-haem iron catalyst can further produce superoxide free radicals through regulation of single-electron reduction of oxygen, promote the generation of hydroxyl free radicals from hydrogen peroxide, and maintain good electrocatalytic removal efficiency of organic pollutants under near-neutral conditions.

This invention discloses a method for the direct oxidative carbonylation of methane to prepare acetic acid. Specifically, this invention provides a catalytic method for the preparation of acetic acid from methane, comprising the following steps: under solvent conditions, in the presence of light, an iron catalyst, chloride ions, and an oxidant, methane and carbon monoxide undergo a methane oxidative carbonylation reaction to obtain acetic acid. This method utilizes readily available methane, carbon monoxide, and air (or oxygen), employs an iron catalyst, and achieves direct, efficient, and highly selective acetic acid production via a one-step photocatalytic reaction, demonstrating promising application prospects. The substrate scope of this invention is broad, applicable to a range of chain and cyclic alkanes.

The present application relates to a kind of COFs supported iron catalyst, its preparation method and application in conjugated diene polymerization, belong to the field of heterogeneous catalytic preparation of polymer.The COFs supported iron catalyst is formed by coordination of covalent organic framework compound and ferrous chloride, and the preparation method is as follows: under the condition of anhydrous oxygen-free, after ferrous chloride, reaction solvent and covalent organic framework LYU-COFZ are reacted at 25~100 ℃ setting temperature for 3~48 hours, centrifugal, washing, drying, the COFs supported iron catalyst is obtained.

The application discloses a kind of offshore oilfield sewage iron stabilizing and sulfur removing system and method.The system includes two pipelines connected with flow pipeline, two pipelines are equipped with main valve, two main valves are connected with the two ends of micro-bubble generator through high-pressure hose, micro-bubble generator suction inlet is connected with swing joint tee suction connector through check valve, swing joint tee suction connector one spare end is connected with ozone generator through ball valve, swing joint tee suction connector another spare end is connected with reagent tank through ball valve.The application generates micro-bubble by inhaled ozone gas, inhaled iron ion stabilizer reacts with ferrous ion in production sewage to form complex iron catalyst;Through micro-bubble ozone and complex iron catalyst, hydrogen sulfide is rapidly reacted to generate sulfur, sulfate and other substances, to achieve the purpose of oilfield sewage iron stabilizing and sulfur removing.

The invention provides an alkyl uracil derivative and a preparation method and application thereof, and relates to the technical field of organic synthesis.The preparation method comprises the following steps that a uracil analogue and olefin are subjected to a hydrogenation alkylation reaction under the action of an iron catalyst and a hydrogen source, and the alkyl uracil derivative is obtained; the iron catalyst comprises at least one of iron nitrate nonahydrate, ferrous nitrate, ferric chloride, ferrous chloride, ferric sulfate and ferric oxalate; the hydrogen source comprises at least one of sodium borohydride, lithium borohydride, lithium aluminum hydride, triphenyl silicon, triethyl silicon and borane. According to the present invention, the olefin is adopted as the alkyl raw material, the pre-functionalization is not required, the specific catalyst and the specific hydrogen source are combined, the hydrogenation alkylation reaction of the olefin and the uracil analogue is successfully achieved, and the technical effect of constructing a series of alkyl uracil derivatives is achieved. According to the invention, the reaction can be carried out at room temperature without light and heat conditions, the reaction time is short, and the functional group tolerance is better.