132 results about "Iron catalyst" patented technology

The invention relates to the technical field of chemical catalysts, in particular to a cerium-based solid solution loaded iron-based oxygen vacancy enhanced low-temperature ammonia synthesis catalyst. The heterovalent ions are doped in CeO2 crystal lattices to introduce strain and defects, so that the oxygen vacancy formation energy and concentration are greatly improved. Experiments show that the oxygen vacancy concentration (delta) of the Ce0. 8Zr0. 2O2-delta carrier disclosed by the invention can reach 0.12, which is 3-5 times that of pure CeO2. Under the conditions of 250 DEG C and 5 MPa, the ammonia synthesis rate reaches 120 [mu] mol / g / h, which is more than 20 times that of a traditional molten iron catalyst; under the conditions of 350 DEG C and 10 MPa, the ammonia synthesis rate exceeds 1000 [mu] mol / g / h and is close to the level of a noble metal ruthenium-based catalyst. As the working temperature is reduced by 100-150 DEG C, the reaction heat consumption is reduced by more than 30%, and the overall energy consumption is reduced by 25-40%.

The invention discloses an iron-based catalyst as well as a preparation method and application thereof. The synthesis method of the iron-based catalyst comprises the following steps: S1, carrying out high-temperature nitriding treatment on an iron-containing catalyst precursor in an ammonia gas atmosphere; wherein the iron-containing catalyst precursor contains an alkali metal element and an alkaline earth element; s2, the activated precursor is placed in a mixed atmosphere to be subjected to in-situ reaction treatment, Fe2N is converted into a Fe7C3-phase iron-based catalyst, and the Fe7C3 catalyst can be obtained, wherein the mixed atmosphere is a mixed atmosphere of a carbon source gas and H2, and the carbon source gas is a mixed gas of one or two of CO2 and CO. The problem of oxidative inactivation possibly occurring in the intermediate transfer process of the catalyst is thoroughly avoided in an in-situ generation mode, so that the initial activity and long-term stability of the catalyst are greatly improved.

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.

A catalyst includes from 5 ppmw to 1000 ppmw of platinum, from 0.1 wt. % to 10 wt. % of gallium, from 2300 ppmw to 30000 ppmw of iron, and at least 85 wt. % support, wherein the support includes one or more of alumina, silica, or combinations thereof.

The invention discloses a method for preparing p-benzoquinone through selective electrocatalytic oxidation of phenol by using a carbon cloth loaded ferronickel catalyst, the method adopts the carbon cloth loaded ferronickel catalyst as an anode to realize efficient conversion of phenol in an aqueous solution into p-benzoquinone, and the product is only p-benzoquinone. The method has the advantages of simple operation process, mild reaction conditions, high catalytic activity, high chemical selectivity and high target compound yield. The p-benzoquinone is prepared by oxidizing phenol in an alkaline environment, so that the use of toxic and harmful chemical oxidants is avoided, the pollutant emission is reduced from the source, and the method is an environment-friendly synthesis process and conforms to the development concept of green chemistry.

The invention relates to a synthesis method of functionalized (poly) silazane, which comprises the following steps: providing heat energy or light energy under the action of an iron catalyst, and completely reacting in a corresponding solvent in the presence of an additive and a functionalization reagent to realize the breakage and functionalization of carbon-hydrogen bonds on a chain in the (poly) silazane compound so as to obtain a polar functionalized product; a (poly) silalkane (oxo) compound; according to the method, commercialized silane, siloxane and polysiloxane compounds are directly used as raw materials, carbon-hydrogen bond functionalization is carried out in a catalytic mode, the method has the advantages of being simple in reaction, easy to operate, short in reaction time, mild in reaction condition, high in reaction efficiency, easy in product separation and purification, good in substrate universality and the like, and a large amount of precious metal and heavy metal salt are prevented from being used; the method is suitable for industrial production in the fields of small molecule synthesis, polymer modification, new material synthesis, luminous silica gel, waste silica gel recovery and the like.

A photoelectric synthesis method for ketone compounds, the present invention relates to the field of organic photoelectric synthesis technology. The present invention solves the technical problem that existing reaction technologies are difficult to achieve in-situ activation of aromatic formic acid and direct coupling with hydrocarbons to prepare ketone compounds. The present invention continuously irradiates the reaction system and passes a constant current, uses carboxylic acid and hydrocarbons as reactants, forms chlorine radicals through an iron catalyst, and the chlorine radical intermediates extract hydrogen from the hydrocarbons to obtain an alkyl radical. At the same time, an acyl nickel compound intermediate is formed at the cathode, and then the intermediate captures the alkyl radical, and a reduction elimination process occurs to obtain a ketone product. This reaction uses the electrons provided by the current in the system as a cheap and clean oxidant, avoiding the use of an external oxidant, and the reaction operation is simple and the conditions are mild. The ketone compounds prepared by the present invention are used in the field of treatment of neurodegenerative diseases.

The application relates to a method for reducing the acid value of a hydrocarbon feedstock, wherein the hydrocarbon feedstock is introduced into an optional dephosphorization and de-ironing reaction zone, and sequentially reacts with a hydrogenation protective agent and a hydrogenation dephosphorization and de-ironing catalyst in the absence of hydrogen, and the reaction effluent is introduced into a deacidification reaction zone, and reacts with a hydrogenation deacidification catalyst in the absence of hydrogen to obtain a reaction product oil with an acid value lower than 0.5 mgKOH / g. The method provided by the application is simple in process flow, convenient in operation and low in cost.

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.

Contact lens treatment systems and methods for disinfecting contact lenses are described. These systems and methods utilize a coated catalytic disc in combination with a fibrous catalyst. The coated catalytic disc contains a support disc and 6 to 300 mg of manganese present on at least a portion of the support disc, often in the form of manganese dioxide. The fibrous catalyst contains 25 to 50 mg iron, often in the form of an iron cation.

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 present application relates to the technical field of catalyst preparation, and discloses a molten iron catalyst and a preparation method and application thereof, wherein the method comprises the following steps: (1) mixing an iron source, a structural promoter and / or a structural promoter precursor, and then performing high-temperature melting treatment to obtain a catalyst carrier; (2) grinding and screening the catalyst carrier to obtain a finished catalyst carrier; and (3) impregnating the finished catalyst carrier with an impregnation solution containing an electronic promoter precursor, and then drying and calcining to obtain the molten iron catalyst. The preparation method is simple to operate, and the combination of the high-temperature melting method and the impregnation method makes the content of the promoter in the catalyst stable, and improves the activity of the molten iron catalyst.

The application discloses a method for promoting sludge dewatering and dissolution based on natural macromolecular organic matter coupling iron catalyst catalytic oxidant, which adds humic acid, iron catalyst and sodium percarbonate into residual sludge in a secondary sedimentation tank of a domestic sewage treatment plant, and keeps stirring at room temperature to complete sludge dewatering and dissolution respectively. The method can efficiently and quickly promote sludge dewatering and dissolution based on natural macromolecular organic matter coupling iron catalyst catalytic oxidant, and is more efficient, green and sustainable compared with single oxidation reaction.

This polyester depolymerization method includes subjecting a polyester to a depolymerization reaction in the presence of an alcohol and a homogeneous iron catalyst. The depolymerization reaction is preferably carried out in the presence of an additive, and the additive is preferably at least one selected from the group consisting of a nitrogen atom-containing cyclic compound or pyrimidine, imidazole and benzimidazole. The homogeneous iron catalyst is preferably at least one selected from the group consisting of iron (III) chloride (FeCl3), iron (III) bromide (FeBr3), and iron (III) iodide (FeI3).

The invention relates to the technical field of sewage treatment, in particular to a sewage treatment system with an MBR (membrane bioreactor) membrane applied to anaerobic ammonia oxidation, which comprises a water inlet tank, a micro-aerobic tank, a water replenishing tank, an anoxic tank and a sedimentation drain tank, adjusting the pH and temperature of the wastewater by the water inlet tank; a PVDF MBR membrane is installed in the micro-aerobic tank, the aperture is 0.1-0.4 micron, intermittent aeration is carried out, and a nano iron oxide catalyst is added; supplementing ammonia nitrogen in a water supplementing pool; stirring and denitrifying in an anoxic tank; and the system further comprises a backwashing system. Sludge is intercepted through the MBR membrane, loss is reduced, the sludge concentration is guaranteed, and the removal rate is increased; the MBR membrane is backwashed by compressed air, dissolved oxygen is provided, and energy consumption is reduced; the hydraulic impact load resistance is high, and the device can be flexibly applied to pools or integrated equipment.

The present invention discloses an inorganic carbon-supported iron catalyst and its preparation method and application. The catalyst is obtained by surface-treating a carbon carrier to form oxygen-containing functional groups, then introducing the carbon carrier into a mixed solution containing an iron-based metal salt and an inorganic ammonium salt to fully disperse the carbon carrier, and then sequentially drying and sintering. The mass ratio of the carbon carrier, the iron-based metal salt and the inorganic ammonium salt is 5 to 8:1 to 5:20 to 25. The catalyst is based on the synergistic effect between the carbon carrier, the inorganic ammonium salt and the iron-based metal salt. The inorganic ammonium salt is used to provide nitrogen elements for the catalyst system, forming a fixed-point nitrogen doping with the carbon carrier, thereby improving the binding between the carrier and the cobalt element, ensuring that the cobalt element is exposed to the catalyst surface, and avoiding the carbon deposition effect of traditional organic molecules during the high-temperature cracking process and clogging the pore structure of the carrier. In addition, the blending of the inorganic ammonium salt and the iron-based metal salt can promote the dispersibility of the two, thereby improving the activity and cyclic stability of the catalyst.

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 discloses a method for synthesizing formanilide and derivatives thereof by catalyzing nitro-aromatic hydrocarbon, a mixture of o-aniline, ferric chloride hexahydrate and silicon dioxide sol is used as a precursor, high-temperature pyrolysis is performed, silicon dioxide is removed by etching with an ammonium bifluoride solution, and a nitrogen-doped mesoporous carbon-loaded iron catalyst is obtained. The raw materials are easily available and low in cost. And by taking nitro-aromatic hydrocarbon as a reaction substrate, adding the prepared nitrogen-doped mesoporous carbon loaded iron catalyst, and reacting for 24 hours at the temperature of 60-80 DEG C in a nitrogen atmosphere by taking tetrahydrofuran as a solvent and formic acid as a reducing agent and a formylation reagent to obtain formanilide and derivatives thereof. The reaction conditions are relatively mild, high temperature and high pressure are not needed, additional additives are not needed, resources are saved, the synthesis yield is excellent, and the method is suitable for industrial production.

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.

The application belongs to the field of catalytic material preparation, and particularly relates to a molybdenum-iron catalyst for methanol oxidation to formaldehyde with high reaction intensity and a preparation method thereof. The catalyst is prepared by the following steps: adding dry molybdenum trioxide powder and a ferric nitrate solution into a hydrothermal reactor, adding ammonia water into the hydrothermal reactor under stirring to control the pH value of the mixed solution; after uniform stirring, the hydrothermal reactor is sealed and placed into an oven for hydrothermal treatment, and then cooled to room temperature; the obtained precursor is filtered, dried and calcined to obtain the catalyst. The preparation method is simple in operation, low in production cost, small in environmental pollution, and does not require many auxiliary facilities. The hydrothermal treatment can strengthen the contact between the active center and the carrier, and the obtained catalyst is high in crystallinity, good in high-temperature stability, high in formaldehyde selectivity, and can be applied to the reaction condition of methanol oxidation to formaldehyde with high reaction intensity.

The invention discloses a method for carrying out electrochemical oxidation treatment on semi-coke wastewater and coupling a cathode to produce hydrogen, and belongs to the field of electrochemical treatment on wastewater. According to the method, a foam nickel-based nickel-iron catalyst is used as an anode, diluted semi-coke wastewater is alkalized and then is used as an anode electrolyte, oxidative degradation of high-COD and high-ammonia-nitrogen semi-coke wastewater is realized under a three-electrode system, and hydrogen is generated by coupling a cathode. According to the method, the conditions are mild, the stability is good, the high removal rate of COD, NH3-N and TOC can be achieved, meanwhile, hydrogen is generated by the cathode, and resource utilization of the wastewater is achieved.

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 relates to the technical field of metallurgy and alloy materials, and discloses a low-carbon high-nitrogen vanadium-nitrogen alloy preparation method based on nitrogen increasing treatment, which comprises the following steps: uniformly mixing vanadium oxide, graphite powder and a catalytic nitrogen increasing agent according to a mass ratio of 1: (0.22-0.30): (0.01-0.05) to obtain a mixture, the catalytic nitrogen increasing agent is prepared by mechanically activating and nitriding ferrovanadium fine powder or ferrochromium fine powder and aluminum nitride powder in a nitrogen atmosphere; carrying out wet mixing activation and ball pressing on the mixture, and calcining in a nitrogen atmosphere to obtain a vanadium-nitrogen alloy; the vanadium-nitrogen alloy is ground into fine powder, the fine powder and iron oxide powder are mixed according to the proportion of 1: (0.05-0.1), secondary calcination is conducted under the CO2-NH3 composite atmosphere, and the low-carbon high-nitrogen vanadium-nitrogen alloy is obtained. According to the method, the problems that the iron catalyst of the vanadium-nitrogen alloy product is inactivated under the high-temperature condition, and the product is high in residual carbon and low in nitrogen due to the contradiction of the reaction conditions between high-temperature deoxidation and low-temperature nitriding are solved at the same time.

This invention discloses a sulfur-nitrogen co-doped porous carbon-supported diatomic iron catalyst and its preparation and application. The preparation process involves: 1) dissolving iron dimer and zinc nitrate fully in methanol solvent, followed by ultrasonic dispersion to obtain a mixed solution; 2) dissolving an organic nitrogen source in methanol solvent, followed by ultrasonic dispersion to obtain a mixed solution, then adding this to the mixed solution from step 1), mixing thoroughly, centrifuging, washing, drying, and pyrolysis to obtain a dry powder; 3) mixing the dry powder with an organic sulfur source, grinding, and calcining at high temperature to obtain the sulfur-nitrogen co-doped porous carbon-supported diatomic iron catalyst. The synthesis method of this invention is simple, the raw materials are readily available, and the obtained sulfur-nitrogen co-doped porous carbon-supported diatomic iron catalyst can effectively form a structure with diatomic iron sites. Furthermore, an appropriate concentration of sulfur atom doping can effectively anchor the diatomic iron active sites, thereby regulating the coordination environment of the active center, exhibiting oxygen reduction reaction performance comparable to commercial Pt-based catalysts.

The invention discloses a method for degrading antibiotics and antibiotic resistance genes in water by activating persulfate with a cyclodextrin-loaded sulfurized zero-valent iron catalyst. The cyclodextrin loaded sulfurized zero-valent iron catalyst (S-nZVI at CD) with a core-shell structure can be prepared through one-step synthesis. Sulfur doping realizes cyclic utilization and rapid electron transfer of iron, and external shell cyclodextrin promotes controlled release of active substances. The constructed S-nZVI CD / PMS system can realize efficient removal of antibiotics such as norfloxacin and ARGs within 40 minutes, and has a relatively wide pH application range (pH is 3-9). The catalytic efficiency of the catalyst is still higher than 91.2% after 11 cycles, and the removal rate of 95% or above is still maintained after the catalyst is exposed in air for 60 days. The preparation process is simple, the problems that a traditional catalyst is prone to inactivation, depends on a high-concentration oxidizing agent, is difficult to recover and the like are solved, and an efficient and stable technical scheme is provided for long-acting treatment of antibiotic and resistance gene pollution.

The invention belongs to the technical field of electrochemical hydrogen production, and provides a chromium-modified ferronickel catalytic material, a preparation method thereof and application of the chromium-modified ferronickel catalytic material in hydrogen production by water electrolysis. Chromium is modified to a commercial metal ferro-nickel material through an electrochemical corrosion method, the material is annealed at different temperatures, and the obtained chromium-modified ferro-nickel catalytic material remarkably solves the problems that an OER catalyst is complex in preparation mode, too high in energy consumption and the like.

The application provides a method for synthesizing alpha-olefins, which comprises the following steps: reducing and pretreating an iron-based catalyst modified by rare earth elements with hydrogen; wherein the rare earth elements comprise one or a combination of two or more of La, Ce and Pr, and the content of the rare earth elements is 0.5-3.0 mol%; feeding raw material gas containing hydrogen, carbon monoxide and carbon dioxide through the pretreated catalyst to perform a synthesis reaction, and obtaining alpha-olefins; wherein the molar content of carbon dioxide, hydrogen and carbon monoxide in the raw material gas is 2.0-8.0 mol%, 49-86 mol% and 6-49 mol% respectively. The method of the application ensures that the iron active component in the iron catalyst maintains a suitable Fe5C2 / Fe3O4 ratio during the reaction process, reduces the generation of heavy hydrocarbons and the deposition of the heavy hydrocarbons on the catalyst surface, and maintains the activity of the catalyst and the stability of the reaction system.

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.