9results about How to "Restore catalytic activity" patented technology

The invention belongs to the technical field of catalysts and application thereof, and relates to an indium oxide catalyst for carbon dioxide conversion and a preparation method and application thereof.The preparation method comprises the following steps that S1, an indium oxide precursor is prepared, specifically, indium nitrate serves as a raw material, and the indium oxide precursor is prepared through a precipitation method; and S2, catalyst preparation: placing the obtained indium oxide precursor in a dielectric barrier discharge system, and treating at the power of 50-60W for 15-20 minutes to obtain the indium oxide catalyst. The indium oxide catalyst is prepared through a dielectric barrier discharge technology, has very high catalytic activity, and can improve the conversion rate of carbon dioxide in the process of converting carbon dioxide into carbon monoxide.

This invention discloses a floating catalyst and its application in the synthesis of p-hydroxyphenylhydantoin. Copper and manganese co-doped nano-TiO2 hydrosol is loaded onto fly ash cenospheres to form a gel. The dried gel is sintered at 600-700℃ to obtain a floating catalyst with fly ash cenospheres as the support. Its chemical composition is: SO42- 2‑ / TiO2-CuO-Mn2O3 / fly ash cenospheres; its mass composition is: TiO2-CuO-Mn2O3 / 2 25%‑30%, CuO3%‑10%, Mn2O 3 6%–20%, S 0.02%–0.1%, fly ash cenospheres 50%–60%; its specific gravity is 0.6–0.90 g / cm³. 3 Specific surface area is 10-50 m² 2 / g; possesses solid superacid properties with an acid strength H0 ≤ -14.5; dissolves in acidic solvents to generate trace amounts of copper and manganese ions. The catalyst of this invention can float on the surface of aqueous solutions, solving the problem of separating solid catalysts from insoluble p-hydroxybenzylhydantoin products; it catalyzes the synthesis of p-hydroxybenzylhydantoin via two pathways, achieving a product molar yield of 68%-72%; it possesses photocatalytic functionality, allowing for the regeneration of catalysts that have lost surface catalytic activity; and it reduces the generation of organic pollutants at the source.

This invention provides a method for preparing a vanadium-titanium catalyst repair agent and a method for repairing vanadium-titanium catalysts using the agent. The preparation method of the repair agent is as follows: A seed mother liquor from the Bayer process for alumina production is added to lime slurry and stirred to obtain a filter cake and filtrate; the filter cake is added to a mixed solution of organic acid and ammonium salt and stirred to obtain an active component replenishment solution; aluminum hydroxide slurry from the Bayer process for alumina production is added to a citric acid solution and stirred to obtain an aluminum sol strength repair solution; the active component replenishment solution and the aluminum sol strength repair solution are then mixed to obtain the final product. The repair method is as follows: the vanadium-titanium catalyst to be repaired is immersed in the repair agent, dried, and calcined to obtain the final product. This invention cleverly incorporates the Bayer process to obtain the key materials required for the repair process, thereby achieving the repair of vanadium-titanium catalysts; after repair, the radial and axial compressive strength, wear resistance, and catalytic activity of the catalyst are all significantly improved.

The invention discloses a magnetic-acoustic combined ozone catalytic oxidation system and method, and relates to the field of sewage treatment. The magnetic-acoustic combined ozone catalytic oxidation system comprises a water inlet pipe, a water distribution system, a reflux water collection system, a sand lifting pipe and a reaction tube; the bottom of the reaction tube is a conical structure; the invention provides a working method of a magnetic-acoustic combined enhanced ozone catalytic oxidation system, through a magnetic field, an acoustic energy converter and a sand lifting and washing system and a pressurized dissolved air system, the pollutants in the sewage are arranged in order, the catalyst regeneration is accelerated, and the utilization rate of ozone is improved.

The invention discloses a fluidized bed reactor for naphtha production, and belongs to the field of naphtha reforming, the fluidized bed reactor for naphtha production comprises a reactor main body and a reaction cavity formed in the reactor main body, and the lower end of the reactor main body is connected with a gas inlet assembly; the gas inlet assembly comprises a bottom plate fixedly connected to the lower end of the reactor main body and a gas outlet distribution disc located above the bottom plate and rotationally connected with the inner wall of the reactor main body, an output port is formed in the reactor main body, and the output port is communicated with the input end of the cyclone separator; the catalytic activity can be recovered under the condition that production is not stopped, downtime is shortened, production continuity is improved, meanwhile, catalyst particles in the fluidized bed reactor are in a fluidized state, contact between gas and the catalyst is very uniform, reaction temperature distribution is more uniform, the local overheating phenomenon is reduced, and production efficiency is improved. High reaction efficiency can be maintained, and the risk of coke accumulation is reduced.

The invention relates to the field of denitration catalysts, and particularly discloses a denitration catalyst reclaimed material recycling method. The recycling method of the denitration catalyst reclaimed material comprises the following steps: (1) pretreatment: crushing the denitration catalyst reclaimed material, and sieving with a 16-mesh sieve; (2) cleaning: soaking the powder in a hydrochloric acid solution with the concentration of 4-8% for 11-12 hours, and washing with water until the powder is neutral; (3) purification: putting the cleaned recycled material into a rotary reactor, adding an ammonium sulfate solution with the mass fraction of 8-12%, controlling the reaction temperature to be 60-70 DEG C, and continuing for 2-2.2 hours; (4) regeneration: drying the purified recycled material, and then carrying out high-temperature calcination in an inert gas atmosphere for 3.5-4 hours; in addition, the preparation method provided by the invention has the advantage of effectively reducing potassium and arsenic in the recycled material.

The large propane dehydrogenation device comprises a tank body, the outer wall of the tank body is connected with a feeding pipe, the feeding pipe is connected with a conveying pump, a T-shaped plate is connected into the tank body, the two sides of the T-shaped plate are each provided with a catalysis structure used for catalyzing propylene reaction, and an opening facilitating circulation is formed in the lower end of the T-shaped plate; a transverse plate is connected to the top in the tank body, and a first detection structure is arranged between the transverse plate and the T-shaped plate. According to the large propane dehydrogenation device, due to the unique flowing mode, the contact opportunity of propane and a catalyst under the high-temperature condition is increased, so that the dehydrogenation reaction is promoted, and when gas penetrates through the mesh frame, the vibration balls can be driven to shake and impact in the mesh partition plates, and vibration is generated. The vibration acts on the mesh partition plate and the mesh frame, so that the catalyst particles filled in the mesh frame move or rotate under the vibration, and the contact between the catalyst particles and the propane gas is further enhanced.

The invention discloses a preparation method of a carbon-based supported nano ferromanganese copper catalyst. The preparation method comprises the following steps: mixing an iron source, a manganese source, a copper source, a carbon source and a solvent, and uniformly dispersing to prepare a precursor solution; under the protection of protective gas, the precursor solution in the step S1 is treated and post-treated by adopting a plasma method, and the carbon-based loaded nano ferromanganese copper catalyst is obtained. The treatment conditions of the plasma method are as follows: the temperature is 1500-3000 DEG C, the current is 100-300 A, the flow of protective gas is 5-20 L / min, and the pressure is 0.1-1.5 atm. The carbon-based supported nano manganese-iron-copper catalyst provided by the invention has an excellent catalytic degradation effect on stink organic waste gas.

This invention discloses a combined heat and power (CHP) system for building hydrogen production from alcohols based on microwave-induced oxidation, comprising a raw material supply mechanism, a mixing tank, a reforming reaction mechanism, and a product purification mechanism. The raw material supply mechanism includes an alcohol storage tank and a deionized water storage tank. A mixing component is installed on the mixing tank. The reforming reaction mechanism includes a microwave generator and a catalytic component installed inside. The mixing tank is connected to the microwave generator via a second connecting component. The product purification mechanism includes an adsorption device for purifying hydrogen. The microwave generator is connected to the adsorption device via a first connecting pipe, and the adsorption device is connected to a hydrogen buffer tank via a second connecting pipe. The reforming reaction mechanism also includes a catalyst regeneration component for catalyst regeneration. This invention effectively overcomes the technical bottleneck of easy catalyst deactivation and frequent replacement required in existing alcohol hydrogen production equipment by adding a catalyst regeneration component to the reforming reaction mechanism.