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 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 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 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 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 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 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.