85 results about "Iron oxide catalyst" patented technology

A process for the upgrading of raw hydrocarbon streams rich in heteroatomic polar compounds and / or unsaturated moieties involving the extractive oxidation of sulfur, nitrogen, conjugated dienes and other unsaturated compounds from said streams, the said process comprising treating said streams with a peroxide solution / organic acid couple and an iron oxide catalyst which is a limonite ore, under an acidic pH, atmospheric pressure and ambient or higher temperature. As a result of the reaction, the oxidized heteroatomic compounds, having strong affinity for the aqueous slurry phase, are extracted into said aqueous phase, while the oxidized hydrocarbon is separated from catalyst by decanting, neutralizing, water washing and drying, the resulting end product being a hydrocarbon stream from which have been removed 90% or more of total nitrogen compounds and basic nitrogen up to 99.7%, both calculated as mass contents.

The invention discloses a method for preparing an activated carbon supported iron oxide catalyst, as well as a wastewater treatment system thereof, which relates to a wastewater treatment technique, in particular to a method for treating refractory toxic organic pollutants in wastewater. The activated carbon supported iron oxide catalyst is a catalyst which is low in price and can be reclaimed. The catalyst can be combined with other techniques so as to be applied to wastewater treatment under mild conditions, wherein the catalyst is combined with ozone so as to form a catalytic ozonation technique and is combined with hydrogen peroxide so as to form a heterogeneous phase Fenton technique; the heterogeneous phase Fenton technique is combined with ultrasound so as to form an ultrasonic synergistic heterogeneous phase Fenton technique; the techniques have good effect of removing refractory wastewater; and a solid phase catalyst is easy to separate, can not introduce new impurities, and allow effluent to be easy to reach the standard. The method has the advantages of simple technological process, low cost and good prospects in actual application.

The invention discloses an activated charcoal ferric oxide carrying catalyst and preparing method in the waste water disposal of phenolic coking water and phenolic waste water, which is characterized by the following: adopting iron sesquichloride and activated charcoal as raw material, carrying ferric oxide on the activated charcoal, drying at 110-120 deg.c for 6h, solidifying at 260-270 deg.c for 12h to obtain the product. The invention reduces CODcr value from 1190mg / L to 70.1mg / L for phenol solution, which is lower than national discharge standard.

The invention discloses a method for treating arsenic-containing wastewater by using a multiphase Fenton system based on iron oxide. The method is characterized in that firstly, the pH of the arsenic-containing wastewater is adjusted to range from 2.0 to 9.0, then an iron oxide catalyst and a hydrogen peroxide oxidizing agent are added, so that an organic arsenic compound completes form transformation from organic arsenic to inorganic arsenic in the multiphase Fenton system based on the iron oxide, meanwhile, released inorganic arsenic forms Fe-As chemical coordinate bonds through binding state iron central atoms on the surface of the iron oxide to be effectively adsorbed, and the arsenic pollutant in the arsenic-containing wastewater is removed. Degradation from organic arsenic to inorganic arsenic and adsorption of the inorganic arsenic can be finished simultaneously in one step, the iron oxide serves as an efficient adsorption material of the inorganic arsenic as well as a Fenton reaction catalyst for degrading the organic arsenic to the inorganic arsenic, and the treatment cost of the organic arsenic wastewater is effectively reduced while the reaction efficiency and the operation simplicity are greatly improved.

The invention discloses a nanometer iron oxide / carbon sphere compound catalyst and a preparation method and an application thereof, which belong to the technical field of catalysts. Iron oxide nano particles are uniformly loaded on the surfaces of carbon spheres. The preparation method comprises the following steps of modifying the surfaces of the carbon spheres by performing a Fenton reaction, i.e., under the strong oxidizing property in the coexistence of hydrogen peroxide and ferrous ions; and uniformly loading iron oxide on the surfaces of the carbon spheres to obtain the nanometer iron oxide / carbon sphere compound catalyst. Due to the adoption of the method, the problems of severe aggregation and the like of a nanometer iron oxide catalyst and the like are solved, and the obtained nanometer iron oxide / carbon sphere compound catalyst is taken as an efficient combustion catalyst for solid propellants, a catalyst for photo-degradation organic matters, and a catalyst for petroleum cracking.

The invention discloses a preparation method for an aluminium-oxide-supported iron oxides catalyst, and application of the catalyst to organic wastewater processing. The preparation method comprises the following steps: (1) firstly cleaning an aluminium oxide particle with clean water, and then modifying the aluminium oxide particle by using a low-pressure plasma, so as to obtain modified aluminium oxide; (2) fully dipping the modified aluminium oxide obtained in the step (1) in an iron salt solution, and then drying, so as to obtain iron-loaded aluminium oxide; and (3) calcining the iron-loaded aluminium oxide obtained in the step (2), so as to obtain the aluminium-oxide-supported iron oxides catalyst after calcining is finished. The aluminium-oxide-supported iron oxides catalys obtained by employing the preparation method possesses the advantages of being fast in reaction speed, relatively thorough in organics degradation, high in ozone utilization rate and the like during organic waste water processing.

The invention belongs to the field of environmental pollution remediation and inorganic materials and particularly relates to a sulfur modified porous iron oxide catalyst, a preparation method therefor and application of the sulfur modified porous iron oxide catalyst. A main ingredient of the porous iron oxide catalyst is iron oxide, and a sulfide of iron coexists. The preparation method comprises the steps: dissolving oxalic acid in water so as to prepare an oxalic acid solution, carrying out heating in water bath, and carrying out stirring while carrying out heating until the oxalic acid is completely dissolved; and adding a sulfur compound solution into the oxalic acid solution, carrying out uniform mixing, then, dropwise adding a ferrous salt solution into the mixture, continuing to carry out stirring until the reaction is thorough, then, carrying out ice bath immediately so as to obtain a yellow suspension, carrying out filtrating, then, carrying out drying treatment so as to obtain a yellow sulfur-modified ferrous oxalate precursor, and then, carrying out calcination, thereby obtaining the sulfur modified porous iron oxide catalyst. The sulfur modified porous iron oxide catalyst can be used for effectively activating hydrogen peroxide and persulfate in sewage water with the pH value of 3-10 and efficiently removing toxic or refractory organic pollutants from the water.

The invention provides a treatment method of organic wastewater through synthesis-free heterogeneous Fenton treatment. The treatment method comprises the following steps of directly adding ferrous ion salt, H2O2 and bentonite powder in waste water, enabling solid-liquid mass ratio of bentonite and the waste water to be 1:1000-10000, enabling ferrous ionic charge mole number to be 50-100% of added bentonite cation exchange capacity, enabling molar ratio of Fe2+ and the H2O2 to be 500-1000:1, adjusting the pH value to be 5-6, stirring and reacting for 5-10min, conducting solid-liquid separation, and enabling the waste water to be discharged after reaching the standard. A series of complex synthesis steps of an original bentonite loaded ferric oxide catalytic agent before application are removed. Purification treatment time of the organic wastewater is shortened, and efficiency is improved. Cation exchange characteristics of the bentonite is used, iron ion is exchanged to a bentonite layer while the iron ion expresses catalytic action, loss of the iron ion is avoided, pollution of the iron ion in water is avoided, and possibility of reutilization is improved.

The invention provides an ultrasonic-assisted mineralized refuse participating method for treating organic waste water by homogeneous Fenton. The method includes the following steps of (1) directly adding a ferrous ion salt, hydrogen peroxide (H2O2) and mineralized refuse powders into the waste water, and adjusting the potential of hydrogen (pH) value to 5 to 6; and (2) adding the waste water into an ultrasonic reactor, performing an ultrasonic action for 1 to 5 minutes, then performing a purification treatment, simultaneously stirring, precipitating after reaction, and performing a solid-liquid separation to complete the waste water treatment. The ultrasonic-assisted mineralized refuse participating method for treating the organic waste water by the homogeneous Fenton has the advantages that cumbersome synthetic steps of prior load type iron oxide catalysts are omitted, besides, the porosity of the mineralized refuse is high, the specific surface area is large, the mineralized refuse is low in cost and easy to obtain, a cation exchange characteristic of the mineralized refuse is utilized, iron ions can be exchanged to the surface of the mineralized refuse while the iron ions exert an catalytic action, the iron ions are prevented from losing, the iron ions in water are prevented from being polluted, the possibility of reutilization is improved, and the reaction can be completed within a short time by the aid of a dispersing function and a cavitation characteristic of ultrasonic waves.

The present invention discloses a Fenton-like catalyst system, and relates to the technical field of sewage treatment. According to the present invention, specifically Fe2(SO4)3 is dissolved in water, the pH value is adjusted to an appropriate value so as to make the Fe2(SO4)3 solution generate Fe(OH)3, FeOOH and other iron oxide flocs, the floc-containing solution and basalt fibers are mixed according to a certain ratio, stirring is performed, the obtained material is placed into a drying oven, constant temperature heating is performed for a certain time to obtain basalt fibers supported on the catalyst, weaving and installation are performed to form a sewage treatment device, and H2O2 is added during the operating process to form a Fenton-like system so as to efficiently purify the sewage. The present invention further discloses a preparation method of a supported iron oxide catalyst carrier. Due to the large specific surface area of the basalt fibers, the iron oxide supported on the surface can supply the iron so as to reduce the iron salt adding and the sludge production, solve the contact problem of the catalyst and the reaction liquid, and improve the catalytic oxidation efficiency.

The invention discloses a method for preparing 4, 4'-diamido stilbene-2, 2'-disulfonic acid. The method comprises the following steps of: using the 4, 4'-dinitro stilbene-2, 2'-disulfonic acid (DNS) as a raw material, using water as a solvent, in the presence of an iron oxide catalyst, reducing with ferrous iron, wherein the reaction conditions are as follows: the mass concentration of the raw material in the water is 1%-15%, the reduction temperature is 25-80 DEG C, the pH value is 6.0-9.0, and the dosage of the catalyst is 0.5-5.0g / l. In the method, the cheap ferrite or ferrous pickling waste liquor as the reducing agent, the ferrous iron is oxidized and further hydrolyzed to generate iron oxide, and the iron oxide can be sold as a product, so that the method is environment-friendly. In the method, the technology is simple, the reaction conditions are mild, the catalyst is high in activity and strong in selectivity, and the production cost is lowered.

The invention discloses a carbon nitride / alpha iron oxide heterojunction catalyst. The catalyst is combined with visible light, low-voltage bioelectricity and persulfate to construct a photoelectric auxiliary Fenton system, and is used for treating organic wastewater. The carbon nitride / alpha iron oxide catalyst has the advantages of visible-light response and low metal dissolution, forms a photoelectric auxiliary Fenton system taking carbon nitride / alpha iron oxide as a catalyst by being combined with a light source and a bioelectrical activation system, is applied to the treatment of persistent organic pollutant in organic wastewater, can show the advantages of high treatment efficiency, low energy consumption and high convenience in system operation management, and provides a new thought for the technology of organic wastewater treatment.

The invention discloses a preparation method and application of a Z-type carbon nitride-iron oxide catalyst containing a nitrogen defect structure, belongs to the technical field of photocatalytic material synthesis, and relates to modification of graphite-type carbon nitride (g-C3Nx) containing a nitrogen defect structure and preparation of the Z-type carbon nitride-iron oxide photocatalyst (g-C3Nx / Fe2O3) containing a nitrogen defect structure by compounding graphite-type carbon nitride with iron oxide (Fe2O3). The preparation method comprises the following steps of: taking urea, melamine orthiourea as a carbon nitride precursor; taking ammonia water, sodium hydroxide, potassium hydroxide or barium hydroxide and other alkalis as auxiliary materials; and taking iron oxalate, ferrous oxalate, ferrous sulfate and the like as iron sources, heating for 2-8 hours at 250-650 DEG C through a one-step roasting method, cooling to the room temperature through programmed cooling, grinding the reaction product into powder, washing the powder with water, and carrying out centrifuging and drying to obtain the catalyst. The preparation method is simple to operate, a nitrogen defect structure isintroduced into conventional g-C3N4 to prepare g-C3Nx, the g-C3Nx and ferric salt are synchronously roasted to compound Fe2O3, and the catalyst is applied to photocatalytic nitrogen fixation for ammonia production. Experimental results show that the prepared catalyst has good photocatalytic nitrogen fixation and ammonia production performance, has a popularization effect on photocatalytic green synthesis ammonia, and is energy-saving and environment-friendly.

The invention discloses a preparation method of a catalyst for surface sulfation of ferric oxide. The method comprises the following steps: (1) preparing ferric oxide; (2) performing sulfation treatment on the surface of the ferric oxide to obtain a ferric oxide catalyst of which the surface is sulfated. The ferric oxide catalyst with the enhanced surface acidity and the proper oxidation-reduction capacity is synthesized for the first time through performing sulfating process on the surface of the ferric oxide, so that the NOx purification activity of middle and high temperature sections in NH3 selectively reducing NOx (namely NH3-SCR) reaction is obviously improved, an operation temperature window is obviously broadened, and the catalyst has the extremely excellent SO2 poisoning resistance performance and is very applicable for catalytic elimination of a stationary source and a mobile source NOX.

The invention relates to a method for synthesizing 3-amino-4-bromophenol. The method comprises the following steps of: (1) diazotization reaction: dissolving 3-nitro-4-aminophenol used as a raw material into hydrobromic acid, and dropping a sodium nitrite aqueous solution at 0-10 DEG C for reacting for 1-3 hours to obtain a 3-nitrophenol-4-diazonium brine solution; (2) bromination reaction: dropping the solution obtained in the step (1) into a hydrobromic acid aqueous solution of cuprous bromide, stirring at 40-50 DEG C for reacting, and crystallizing and filtering to obtain a 3-nitro-4-bromophenol solid; and (3) reduction reaction: dissolving the solid obtained in the step (2) into alcohol, adding an iron oxide catalyst, heating up to 50-100 DEG C, and adding a hydrazine hydrate aqueous solution to the mixture for reacting for 2-5 hours to obtain the 3-amino-4-bromophenol. The synthesis method of the 3-amino-4-bromophenol has the advantages of reasonable design, moderate condition, easiness of operation and higher product yield and is suitable for industrial production.

The invention discloses a method for preparing 2,3,6-trimethylphenol by using 2,5-dimethylphenol. In the method, the 2,5-dimethylphenol, methanol, water and nitrogen in a certain ratio perform a gas phase reaction in a fixed bed reactor in the presence of an iron oxide catalyst so as to synthesize the 2,3,6-trimethylphenol by one step. In the preparation method, the easily obtained 2,5-dimethylphenol is used as a raw material, so that the problem of raw material resource for industrial preparation of the 2,3,6-trimethylphenol is solved; a novel iron oxide catalyst is used so that continuous synthesis time of the 2,3,6-trimethylphenol is prolonged; the conversion rate and the selectivity of the reaction are improved; a material feeding temperature is reduced; and equipment cost is reduced due to the adoption of a fixed adiabatic bed reactor. Therefore, the manufacturing cost of a product is reduced greatly; and the method has very good economic benefits and social benefits.

The invention relates to a method for producing carrier ferric oxide catalyst used to make aromatic hydrocarbons acyl. Wherein, it is characterized in that: it uses the mixture of metal oxide, zeolite molecule screen or metal oxide and zeolite molecule screen as carrier, uses the water solution of ferric salt, nickel salt, or cobalt salt as emerge liquid; (1) emerging said carrier for 6-12hours; (2) drying the carrier for 3-8hours at 60-150Deg. C, and baking it for 4-12hours under 300-700Deg. C, to obtain the precursor of catalyst; (3) repeating said operations to obtain final product. The invention can improve the activity, selectivity of catalyst, and reduce the iron content.

The invention relates to high-purity helical carbon nanotubes and a preparation method thereof. The method comprises the following steps: (1) preparation of alpha-crystal-form nano iron oxide catalyst precursor: preparing the alpha-crystal-form nano iron oxide catalyst precursor by pre-precipitation in combination with a sol-gel process; and (2) preparation of high-purity helical carbon nanotubes: putting the alpha-crystal-form nano iron oxide catalyst precursor into a pipe furnace, reducing the alpha-crystal-form nano iron oxide catalyst precursor into a nano iron catalyst by an in-situ reduction process, introducing a carbon source and vapor as catalytic regulation aids, and keeping the temperature for 6-10 hours, thereby obtaining the igh-purity helical carbon nanotubes. The method is simple, safe and environment-friendly. The purity of the prepared helical carbon nanotubes is up to 99% or above, and the yield is up to 7709-8077 (g-HCNTs / g catalyst); and the product has uniform parameters (diameter, helical diameter, screw pitch and the like) and complete shape.

The invention relates to a synthesis method of nano magnetic hydroxyl iron oxide with a core-shell structure, and in particular relates to a synthesis method of a nano magnetic hydroxyl iron oxide ozone catalyst with a core-shell structure, aiming at solving the problems that the hydroxyl iron oxide catalyst is difficult to recover, easily causes secondary pollution and is hard to be applied to practical engineering. The method comprises the steps of 1, preparing a ferric salt solution, and feeding an auxiliary agent into the ferric salt solution; 2, feeding tetraethoxy-silicane; 3, soaking solid phase matter B into trivalent iron salt solution; 4, preparing the nano magnetic hydroxyl iron oxide with the core-shell structure. The nano magnetic hydroxyl iron oxide with the core-shell structure has the advantages of being large in specific surface area, good in magnetic property, easy to separate, high in catalytic activity and easy to prepare; furthermore, the magnetic hydroxyl iron oxide with the core-shell structure is capable of promoting the decomposition of ozone to generate hydroxyl radicals, so that the generation rate and number of free radicals in water can be increased. The synthesis method is used for synthesizing the nano magnetic hydroxyl iron oxide ozone catalyst with the core-shell structure.

The invention relates to a method for photocatalytic oxidation of alkane by iron oxide. The method employs iron oxide and N-hydroxyphthalimide or a derivative thereof to compose a photocatalytic system, and uses air or oxygen as the oxidant to realize selective oxidation of different hydrocarbons under the conditions of 400-650nm visible light irradiation at room temperature, thus generating an oxygen-containing chemical product. The specific steps include: dissolving a substrate hydrocarbon and N-hydroxyphthalimide or a derivative thereof in a solvent, adding an iron oxide catalyst, then replacing the atmosphere in a photoreactor with air or oxygen, and carrying out reaction at 20-35DEG C under 400-650nm visible light irradiation for 10-600min so as to generate corresponding aldehyde, ketone or organic acid. The synthesis method provided by the invention has important application in mild oxidation of hydrocarbons.

The invention discloses a high-performance iron-doped nickel- or cobalt-based amorphous oxyhydroxide catalyst prepared by a room temperature method, and a research thereof on high-efficiency hydrogen production by electrolyzing water, and belongs to the technical field of hydrogen production by electro-catalytic materials. According to the technical scheme, FeCl3. 6H2O and ethyl alcohol are mixed to form a precursor solution to conduct surface slow corrosion on conductive substrates such as foamed nickel and cobalt produced in a macro-scale mode, and a nickel-iron or cobalt-iron oxide catalyst grows on the surfaces of the conductive substrates in situ. A chemical reduction reaction is creatively introduced, and the excellent oxygen evolution catalyst is obtained on a commercial metal conductive substrate by utilizing chemical corrosion at room temperature. According to the unique material synthesis path, the non-noble metal cobalt or nickel-based oxygen evolution catalyst shows excellent oxygen evolution activity in an alkaline environment after in-situ iron doping, the overpotential is reduced to about 280 millivolts at the large current degree of 500 mA / cm<2>, the operation is stable in the large-current environment of 1.5 A / cm<2> or above, and the catalyst is suitable for industrial large-scale application and has wide application prospects. And the hydrogen fuel automobile and hydrogen energy industry in China is assisted.

A manufacturing method of an iron complex is mixing ferric chloride and at least one chelating agent with a solvent, wherein Fe3+ ions of ferric chloride is reacted with the at least one chelating agent to form an iron complex Fe[R1]a[R2]b[H2O]c3+ or Fe[R1]a[H2O]c3+, wherein the at least one chelating agent is selected from a group including ethylenediamine, 1,10-phenanthroline, 2,2′-Bipyridine, diethylenetriamine, triethylenetetraamine, phenanthroline, or bipyridine. Moreover, a method for producing an iron oxide catalyst is mixing ferric chloride, at least one chelating agent and the support with a slovent to form an iron complex, which is incorporated with the support. Following, a drying step and a heat treatment step are processed to get the iron oxide catalyst.

The invention discloses a method for breaking colloid of fracturing flow-back liquid based on a gamma-hydroxyl iron oxide catalytic ozone advanced oxidation system. The method comprises the followingsteps: (1) preparation of a gamma-hydroxyl iron oxide catalyst; (2) building of fluidized bed catalytic filler; (3) conversion of an ozone advanced oxidation system; (4) colloid breakage of the fracturing flow-back liquid. According to the method, by the use of hydroxyl iron oxide catalytic ozone which generates hydroxyl radical, the speed of oxidizing organic colloid broken bonds in the fracturing flow-back liquid is higher; the system takes clean ozone as a raw material, so that no secondary pollution is caused; as the catalyst is a surface-hydroxylated iron oxide passivation layer, the useamount of the catalyst is small, and only a little of iron mud is produced; the degradable removal rate of organic matters oxidized for two hours can be 60 percent; the oxidization effect is doubled when compared with the direct oxidization effect of ozone.

Relating to the technical field of wastewater treatment, the invention in particular discloses a method for degradation of high salinity organic wastewater and synchronous preparation of iron oxide. The method at least includes the steps of: firstly adjusting the pH value of the high salinity organic wastewater to 4.0-6.5, adding an iron oxide catalyst in advance, then adding an oxidizing agent and Fe<2+> for reaction, and controlling the pH value at 4.0-6.5 in the reaction process; and conducting filtration at the end of reaction, adding water into a filter cake for dispersion, then adding Fe<2+>, and carrying out heating reaction to generate iron oxide red or iron oxide yellow. According to the invention, the catalyst iron oxide is added in advance to induce reaction, then Fe<2+> and the oxidizing agent are added simultaneously for in-situ generation of a lot of nano-iron oxide catalyst, the .OH generation efficiency and organic matter degradation speed are improved, the TOC removal rate is 80% or above, the degradation effect is excellent, and at the end of degradation, a pigment grade iron oxide product can be obtained, thus achieving waste utilization.

The invention discloses a high-efficiency catalyst for preparing 1,3-butadiene by using carbon dioxide to oxidize 1-butene to dehydrogenate and a preparation method thereof, wherein the catalyst consists of a carrier and an active component, a compound oxide of metal iron and a doping element is taken as the active component, and a precipitation roasting mode is adopted for preparation. The catalyst disclosed by the invention can be used for preparing for preparing 1,3-butadiene by using carbon dioxide to oxidize 1-butene to dehydrogenate, and is high in activity, good in selectivity, good instability and low in preparation cost, and the preparation method is simple in process. Compared with a traditional aluminum oxide loaded iron oxide catalyst, the crystal lattice oxygen fluidity and the crystal lattice oxygen content of the catalyst can be effectively improved, so that the activity and the stability of the catalyst are improved.

The invention discloses an iron oxide micron sheet self-supporting electrode and a synthesis method thereof, and belongs to the technical field of self-supporting electrode preparation. The self-supporting electrode is foam iron, iron oxide with micron sheet morphology is uniformly grown on the surface of the foam iron; the synthesis method of the iron oxide micron sheet self-supporting electrodecomprises the following steps: soaking foam iron into a urea aqueous solution, performing hydrothermal reaction to obtain the iron oxide micron sheet self-supporting electrode. The foam iron is used as a reactant to react with the urea solution at a specific temperature, an iron oxide catalyst of the micron sheet structure uniformly grown on the surface of the foam iron is synthesized on the surface of the self-supporting electrode foam iron, and the iron oxide catalyst is good in electrochemical activity. The foam iron can be used as the supporting electrode, and also can be used as the reactant to participate into the reaction, the cost of the supporting electrode is reduced, the material dosage is saved, and the experimental step is simplified.

The invention discloses a preparation method of a dichromium trioxide-aluminum trioxide catalyst, which comprises the following steps: (1) mixing chromium trioxide and potassium carbonate and adding them into deionized water to obtain a mixture of chromium trioxide-potassium carbonate Solution, ultrasonically dispersed for 30min, cooled naturally to room temperature to obtain mixed solution A; (2) Soak γ-Al2O3 in mixed solution A, and then react in a microwave reactor; (3) The product of step (2) was heated at 3000rpmm Stir the reaction for 30-60min at a certain speed, then ultrasonically disperse for 10-20min, and then repeat this step 3 times; (4) The product of step (3) is left to stand at 50-80°C for 5-8h, and then dried, Finally, it is calcined in a muffle furnace. The present invention prepares the dichromium trioxide-aluminum trioxide catalyst through a microwave method, and has good dehydrogenation catalytic performance, large specific surface area, good selectivity, good wear resistance and good stability.

A nano-iron oxide catalyst for the catalytic oxidizing of CO with high catalytic activity and thermal stability is prepared through dissolving Fe salt and pyrrolidone in N,N-dimethyl formamide, stirring, reaction, cooling, washing and drying.

The invention provides a Fenton-like technique for treating biochemical effluent. According to the technique, the pH value of the biochemical effluent to be treated is controlled at 6.0-7.0, and Fenton-like reaction is performed under the combined actions of a ferrous salt solution and oxydol by using a supported nano iron oxide catalyst with the particle size of 10-40 meshes. The Fenton-like technique is especially suitable for carrying out advanced treatment on biochemical effluent in the field of coking, can obviously enhance the catalytic efficiency of the Fenton-like reaction process, avoids the side reactions, avoids generating float sludge in the treatment process, and enhances the quality of the treated effluent. Besides, the pH value of the treated effluent is 7.0-8.0, and the treated effluent can be directly discharged without regulating the pH value. Besides, the sludge generated in the reaction process can be subjected to waste utilization for paint production. The invention also provides a reactor for implementing the Fenton-like technique. The reactor is more beneficial to enhancing the wastewater treatment effect.

The invention relates to a preparation method of an Al < 3 + > doped and modified iron oxide catalyst with a metal organic framework structure, namely Al < 3 + > is added into MIL-53 (Fe) by adoptinga solvothermal method to inhibit the decomposition of the MIL-53 (Fe) in water so as to enhance the stability of the MIL-53 (Fe) in water. H2 / Ar atmosphere is used for reduction treatment, an MIL-53 (Fe) framework is reserved, meanwhile, part of amorphous carbon is generated, the specific surface area of the catalyst can be further increased, rich catalytic active sites are provided, the adsorption quantity of pollutants on the surface of the catalyst is effectively increased, and efficient catalytic degradation of organic pollutants in water is promoted. Besides, the catalyst has good magnetism, the problem of difficult recovery in practical application is effectively solved, efficient recycling of the powder catalyst is realized, and the catalyst has a great practical application prospect.