218 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 present invention belongs to the field of agricultural technology, and in particular to a method for converting Chinese medicine residues into Chinese herbal medicine organic fertilizer using a cobalt-iron catalyst. The method comprises the following steps: (1) synthesizing a cobalt-iron catalyst; (2) mixing and pyrolyzing the Chinese medicine residues and the cobalt-iron catalyst; (3) activating the pyrolysis product to obtain the Chinese herbal medicine organic fertilizer. The process of the present invention is simple and easy to operate, and the prepared cobalt-iron catalyst has excellent catalytic performance and good cyclic stability, and can efficiently and quickly convert the Chinese medicine residues into Chinese herbal medicine organic fertilizer. At the same time, the prepared Chinese herbal medicine organic fertilizer has good water solubility, is rich in abundant plant growth nutrients, and has the effect of increasing production and increasing efficiency of Chinese herbal medicine.

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 provides a method for synthesizing alpha-olefin. The method comprises the following steps: carrying out reduction pretreatment on a rare earth element modified iron-based catalyst by adopting hydrogen; wherein the rare earth element comprises one or a combination of more than two of La, Ce and Pr, and the content of the rare earth element is 0.5-3.0 mol%; raw material gas containing hydrogen, carbon monoxide and carbon dioxide is subjected to a synthetic reaction through the pretreated catalyst, and alpha-olefin is obtained, wherein the molar contents of carbon dioxide, hydrogen and carbon monoxide in the feed gas are 2.0-8.0 mol%, 49-86 mol% and 6-49 mol% respectively. According to the method disclosed by the invention, the iron active component in the iron catalyst is regulated and controlled to keep a proper Fe5C2 / Fe3O4 proportion in the reaction operation process, the generation of heavy hydrocarbon and deposition of the heavy hydrocarbon on the surface of the catalyst are reduced, and the activity of the catalyst and the stability of a reaction system are maintained.

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 invention discloses wastewater treatment equipment in an iron circulation catalytic reaction tower, and relates to the technical field of wastewater treatment, and the wastewater treatment equipment comprises a tank body mechanism. According to the wastewater treatment equipment in the iron circulation catalytic reaction tower, through the design of the tank body mechanism, wastewater enters the interior of the tank body shell from one side of the feeding mechanism, an iron catalyst is injected into an iron circulation pipe to enter the interior of the tank body shell, a central rotating shaft is controlled to rotate through a first motor, a rotating plate mechanism is driven to rotate, and the effect of stirring the wastewater and chemicals is achieved; the reaction kettle can be used for promoting substance mixing, providing a uniform catalyst environment for a subsequent catalytic reaction, improving the consistency and stability of the reaction, accelerating the reaction speed, promoting iron circulation and preventing scaling and precipitation, and after precipitation for a certain time, fluid flows out from one side of the discharging pipe, so that subsequent treatment is facilitated, impurities in the precipitation process are adsorbed at the bottom of the tank body shell, and the precipitation effect is improved. Impurities are cleaned through the stirring mechanism and discharged to one side of the blow-off pipe, and the situation that the follow-up operation effect is affected due to excessive impurity precipitation is avoided.

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 relates to a monatomic iron catalyst for electrochemical reduction of carbon dioxide, and a preparation method and application thereof. In particular, the present invention relates to a process for the preparation of Fe (II) doped Zn-ZIF precursor materials and to the use thereof in the preparation of catalysts comprising Fe monatomic atoms, obtained on an N-doped carbon matrix from the pyrolysis of such Fe (II) doped Zn-ZIF precursor materials.

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.

The invention relates to the field of ammonia decomposition catalyst preparation, and discloses an iron-containing catalyst, a preparation method and application thereof, and a method for producing hydrogen through ammonia decomposition. The invention relates to an iron-containing catalyst. The catalyst comprises a magnesium titanate carrier and an iron element loaded on the magnesium titanate carrier, wherein on the basis of the total weight of the catalyst, the content of iron is 5-20wt% in terms of iron element. The catalyst has relatively high activity, is applied to hydrogen production through ammonia decomposition, and has a relatively high ammonia decomposition conversion rate at a low temperature and a relatively high reaction space velocity.

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 discloses an iron phosphide catalyst for separating hydrogen isotopes from PEM electrolyzed water and a preparation method of the iron phosphide catalyst, and the preparation method of the iron phosphide catalyst comprises the following steps: step 1, adding ferric salt and carbon black into a solvent according to a certain proportion, dispersing, and evaporating the solvent to obtain a uniform mixture of the ferric salt and the carbon black; 2, heating the mixture obtained in the step 1 at a high temperature, and introducing hydrogen-argon mixed gas to obtain an intermediate product Fe / C; and 3, carrying out high-temperature phosphorization on Fe / C and red phosphorus under the protection of argon to obtain the iron phosphide catalyst. The non-noble metal iron phosphide catalyst is synthesized to replace a traditional noble metal platinum carbon catalyst, the cost is reduced, and the hydrogen isotope separation factor is remarkably increased to 6-8; the cathode iron phosphide catalyst disclosed by the invention is high in stability, the performance of the cathode iron phosphide catalyst is almost not attenuated after long-time electrolytic reaction, an electric pile can stably run for about more than 2000 hours under the condition that the current density is 0.5 A / cm < 2 >, and the cathode iron phosphide catalyst has a very high industrial application value.

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 invention relates to the field of compound preparation, and discloses a method for preparing carboxylic acid aryl ester through in-situ oxyarylation of aryl halide and carboxylic acid under the catalysis of light-induced iron, which comprises the following steps: by taking aryl halide and carboxylate as raw materials, iron metal salt as a catalyst and nonmetal Lewis acid as an additive, carrying out light illumination in an inert gas atmosphere, and carrying out in-situ oxyarylation on aryl halide and carboxylic acid to obtain the carboxylic acid aryl ester. And reacting in an organic solvent according to a reaction formula to obtain the carboxylic acid aryl ester compound as shown in the formula III. According to the method, the problem of high bond energy of a C-F bond in aryl fluoride is overcome by innovatively utilizing a system formed by photo-activated iron catalysis-nonmetal Lewis acid, efficient coupling of fluorobenzene and aryl halide containing electron donating / withdrawing substituents and inorganic carboxylate is realized, the range of aryl halide substrates is widened, reaction conditions are mild, strong acid and strong base are not needed, and the method is suitable for industrial production. And precious metal is replaced by a cheap iron catalyst. The invention provides an efficient and environment-friendly new way for green synthesis of the ester-based aromatic compounds, and has a remarkable industrial application prospect.

The invention discloses a preparation method and application of an anode oxygen evolution catalyst. The preparation method comprises the following steps: respectively putting untreated foamed nickel with the area of 2cm * 4cm into a hydrochloric acid solution, deionized water and ethanol, and carrying out ultrasonic treatment for a certain time; and obliquely inserting the treated foamed nickel into a reaction kettle filled with a nickel salt, an iron salt, a chromium salt and a precipitator, putting the reaction kettle into a blast oven for hydrothermal reaction, naturally cooling to room temperature after the reaction is completed, and washing with deionized water to obtain the foamed nickel supported chromium-doped ferronickel layered hydroxide anode oxygen evolution catalyst. The anode catalyst prepared by the method provided by the invention has better long-term durability under large current density, and in the OER process, the dissolution of chromium can promote the reconstruction of the nickel-iron catalyst and generate more active sites and pore channels, so that the electrochemical active area of the nickel-iron-based catalyst is increased, and the permeation of electrolyte and the diffusion of ions are promoted.

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.

This application relates to a supported nano copper-iron catalyst and a sewage treatment device. The supported nano copper-iron catalyst utilizes the reaction of S2- and Cu1+ with Fe3+ ions, which enhances the rate of conversion of Fe3+ to Fe2+ in the Fenton reaction, optimizes the path of Fe3+ conversion to Fe2+, and strengthens the occurrence of the Fenton reaction. The catalytic degradation of organic pollutants mainly depends on the hybrid membrane in the wastewater treatment device. Placing the catalyst on the hybrid membrane can reduce a large amount of catalyst accumulation and the problem of poor catalyst performance caused by easy deposition of the catalyst. Through the catalyst on the hybrid membrane and the original powdered catalyst in the wastewater treatment device, effective collision and contact occur among gas, solid, and liquid in the reaction zone, increasing the contact probability between the catalyst and organic pollutants in the wastewater and accelerating the reaction efficiency. The hybrid membrane is fixed in the reaction zone in a skid-mounted form, which can reduce energy consumption. At the same time, the wastewater treatment device has the advantages of convenient on-site maintenance, simple replacement, recyclability of the device, and no hazardous waste residue, etc.

The present application relates to the field of fossil resource recycling and fuel cell catalyst technology, and specifically to a method for preparing a platinum iron carbon catalyst using waste rubber powder, a platinum iron carbon catalyst and its application. The method of the present application comprises: subjecting a first waste rubber powder to pyrolysis treatment to obtain pyrolytic carbon; mixing the pyrolytic carbon with a metal salt, a chelating agent and water to obtain a first mixture; the metal salt comprises a platinum salt and an iron salt; heating the first mixture under stirring to obtain a sol; drying the sol and then calcining it to obtain a catalyst precursor; mixing a second waste rubber powder with a catalyst precursor to obtain a second mixture; subjecting the second mixture to microwave radiation treatment to obtain a platinum iron carbon catalyst. The technical solution of the present application provides a method for preparing a high-activity platinum carbon iron catalyst with a simple process and low cost, and also realizes the high-value recycling of waste rubber.

The present disclosure generally relates to methods of producing polyolefins in gas phase polymerizations. In an embodiment, a process for producing a polyethylene includes introducing, under polymerization conditions, ethylene and a C3-C40 alpha-olefin with a catalyst system and a continuity' aid in a reactor. The catalyst system includes an activator, an iron catalyst compound, and an unbridged Group 4 metallocene catalyst compound having one or more alkyl silyl substitutions. The process includes forming a polyethylene composition.

The invention discloses application of starch-nano zero-valent iron in catalytic electro-Fenton degradation of chemical wastewater. According to the invention, a starch / nano zero-valent iron catalyst (S-nZVI) and a bare nano zero-valent iron catalyst (nZVI) are prepared by a liquid phase reduction method, and characterization analysis results show that S-nZVI has a better dispersion effect than nZVI. And under the optimal operation condition, the removal rate of COD (Chemical Oxygen Demand) can reach 76.03%. An ultraviolet-visible spectrum and a three-dimensional fluorescence spectrum are used for analyzing the wastewater before and after the reaction, and the S-nZVI catalytic electro-Fenton reaction can effectively remove benzene rings, unsaturated aldehydes, ketones, cyclic aromatic compounds and other organic pollutants in the wastewater. Experimental results show that the electro-Fenton system constructed by the S-nZVI has a good treatment effect on wastewater, can effectively degrade organic pollutants which are difficult to degrade in the wastewater, and has a certain application prospect on pretreatment of the wastewater.

The invention discloses an iron electrode of an iron-air battery and a preparation method of the iron electrode. Porous nitrogen-doped carbon powder is prepared by mixing polyaniline and a saturated sodium chloride solution and performing high-temperature pyrolysis; mixing the porous nitrogen-doped carbon powder with iron particles subjected to surface vulcanization treatment, and performing high-energy ball milling treatment to obtain carbon-coated iron particles subjected to surface vulcanization treatment; performing ultrasonic treatment on the carbon-coated iron particles subjected to surface vulcanization treatment and carbon nanotubes in ethanol to obtain iron catalyst powder with a three-dimensional porous structure; and finally, coating the surface of a stainless steel mesh with the coating, and performing hot-pressing treatment to obtain an iron electrode product. The passivation of the iron particles in the charging and discharging process is reduced through sulfuration treatment of the iron particles, and the iron electrode is further stabilized through coating treatment of the nitrogen-doped carbon powder; and finally, through ultrasonic treatment, the carbon nanotubes and the iron catalyst powder are intertwined to form a three-dimensional porous structure, so that the overall stability of the electrode is facilitated, and a product in the charge-discharge process is fixed.

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.