36results about How to "Achieve catalytic effect" patented technology

The invention relates to a preparation method for a manganese-based oxide catalyst used for catalytic oxidation of ethanol. The method is a hydrothermal synthesis method and comprises the following steps: (1) mixing a divalent manganese salt and an oxidizing agent, dissolving an obtained mixture in water and adjusting the pH value of an obtained solution to 0 to 2, wherein the mol ratio of divalent manganese in the divalent manganese salt to the oxidizing agent is 0.5 to 2.0; (2) stirring the mixed solution obtained in step (1) at room temperature and subjecting the mixed solution to a reaction at a temperature of 80 to 200 DEG C for 1 to 36 h; (3) washing and drying a product obtained in step (2); and (4) roasting the dried product so as to obtain the manganese-based oxide catalyst used for catalytic oxidation of ethanol. The manganese-based oxide catalyst has high activity in a low temperature range ( lower than 150 DEG C) and is applicable to elimination of ethanol gas which has not been totally consumed at a low temperature working condition section of a motor vehicle and to elimination of indoor ethanol gas.

The invention belongs to the field of flue gas denitration and provides a metal pillared montmorillonite supported gamma-MnO2 low-temperature denitration catalyst and a preparation method thereof, aiming at low support strength of existing commercial catalysts and the defects of the denitration properties of Mn-based catalysts in the presence of SO2. The catalyst is characterized in that lamellar montmorillonite is taken as a support, is interlayer-pillared by metals with different SO2 resistance and simultaneously supports gamma-MnO2 with higher low-temperature activity. The catalyst and the preparation method have the beneficial effects that superiority combination of gamma-MnO2 and interlayer SO2 resistant metals is achieved by utilizing the large specific surface area of lamellar montmorillonite; the catalyst prepared by adopting the method has high mechanical strength, is unnecessary to be calcined at high temperature, has good low-temperature activity and also has excellent SO2 resistance; besides, adopted montmorillonite is abundant in China, is low in cost, is easy to mold and transport and is an excellent catalyst support which can be actually used.

The invention relates to a rotating arc thermal plasma catalytic cracking high-concentration VOC tail gas treatment system and method, and the rotating arc thermal plasma catalytic cracking high-concentration VOC tail gas treatment system comprises an activated carbon alternating adsorption device, a hot air alternating desorption device, a rotating arc thermal plasma high-concentration waste gascracking catalytic device, a DBD plasma advanced treatment device and a water spraying device. According to the invention, through the activated carbon alternating adsorption device and the hot air alternating desorption device, and through parallel alternating work, one path realizes that low-concentration (10 mg/m<3>) waste gas is firstly adsorbed and then directly discharged, and the other pathdesorbs the other path of adsorption module with 1% of hot air flow rate, so that the low-concentration waste gas with large air volume is converted into high-concentration waste gas with small air volume for treatment, thereby providing possibility for greatly reducing the scale of plasma equipment and reducing investment cost.

The invention discloses an electrode loading with a composite oxide magnetic nanowire and a carbon nanotube and its preparation and an application. The preparation includes steps of (1), mixing hexadecyl trimethyl ammonium bromide, hexamethylene and n-amyl alcohol evenly; then adding oxalic acid solution; after mixing evenly, adding mixed solution containing transition metal ion and cobalt ion; continuously stirring under the room temperature to obtain microemulsion; (2), centrifugally removing impurities and drying in the air to obtain powder; forging in the air to obtain the transition metal/cobalt composite oxide magnetic nanowire; (3), dissolving the transition metal/cobalt composite oxide magnetic nanowire and sodium dodecyl benzene sulfonate in ethylene glycol; after dispersing evenly, immersing a sponge or carbon felt electrode; taking out the sponge or carbon felt electrode and drying; immersing again; repeating the operation for many times to obtain the electrode. The actual application effect is stable and efficient, the electrode loaded with metal oxide/carbon nanotube can be prepared, and the plasma of organic pollutant can be degraded.

The invention discloses a catalyst. A preparation method for the catalyst comprises the following steps: grinding electric furnace dust by using a ball mill, and conducting sieving by using a 75-to-400-mesh sieve; placing the sieved electric furnace dust in a drying oven for drying at a temperature of 75-105 DEG C for 5-48 h so as to obtain pretreated electric furnace dust; and putting the pretreated electric furnace dust and sodium salt solution into a rubber-sealed glass bottle, conducting magnetic stirring in an oil bath pan at 55-105 DEG C for 0.5-5 hours, drying an obtained sample in the drying oven at 75-105 DEG C for 4 hours or more, and conducting sieving with the 75-to-400-mesh sieve to obtain the required sodium-electric furnace dust catalyst. The catalyst has acidity and alkalinity at the same time, and can be automatically separated from a liquid product through standing. The catalyst can be directly used for reaction of low-acid-value oil, the catalytic effect of the catalyst is very good, biodiesel yield is larger than 95%, and the recovery rate of the catalyst is larger than 90%. Moreover, the recycling capability of the catalyst is better, and the yield of biodiesel can still reach 90% or above after 15 times of reactions.

The invention discloses a method for loading nano titanium dioxide on a textile, the textile loaded with the nano titanium dioxide and an application thereof. The method comprises the following stepsof step S1, preparation of a nano titanium dioxide solution: placing nano titanium dioxide particles, an adjuvant and a solvent in a container for mixing, adjusting the pH to be 5 to 10, ultrasonically dispersing for 2 to 5 minutes at 20 to 40kHz to obtain the uniform nano titanium dioxide solution; step S2, a textile loading process: placing the textile in the nano titanium dioxide solution, andperforming the ultrasonic treatment at the temperature of 60 to 95 DEG C for 0.2 to 2h at 20 to 40kHz; and step S3, blocking, fixing and forming: adding a water-dispersible adhesive to fix for 0.5 to1h, and drying and curing at 80 to 120 DEG C. According to the method of the invention, the manufacturing cost is low, the loading fastness of the nano titanium dioxide particles is high, and the problem of agglomeration of the titanium dioxide particles is solved. According to the textile loaded with the nano titanium dioxide prepared by the method provided by the invention, the catalytic actionbetween the nano titanium dioxide particles, air and water molecules is maximized, and the anti-fouling, anti-bacterial and anti-ultraviolet performance of the textile is improved.

The invention discloses a catalyst which is prepared by the following steps: grinding blast furnace dust by using a ball mill, and conducting screening; drying the sieved blast furnace dust at 75-105 DEG C for 5 hours or more to obtain pretreated iron-containing blast furnace dust; and soaking the pretreated blast furnace dust in a sodium salt solution, placing the pretreated blast furnace dust in an oil bath pan, carrying out magnetic stirring at 65 DEG C, drying the obtained sample at 75-105 DEG C for 5 hours or more, sieving the dried sample, and conducting calcining at 500-700 DEG C in a nitrogen atmosphere to obtain the sodium salt-blast furnace dust catalyst. The catalyst can be directly used for reaction of low-acid-value oil, the biodiesel yield is larger than or equal to 95%, the recycling capacity is good, and the biodiesel yield can reach 90% or above after 16 times of recycling.

The invention relates to a scale depositing basket for a fixed bed reactor, belonging to the field of petrochemical plants. The scale depositing basket includes a cylindrical frame, an outer screen mesh mounted on the frame and a plurality of sieve tray groups arranged in the frame, wherein each sieve tray group comprises a spatial sieve tray and a planar sieve tray, and holes are arranged along the vertical center axis of the spatial sieve tray. The scale depositing basket provided in the invention can effectively filter ash scales and other impurities in a liquid feed, mitigates the problem of scaling of impurities on the contact surface of the scale depositing basket and a fixed bed catalyst bed during a reaction, prolongs the working time of the scale depositing basket and lengthens the service time of a catalyst.

The invention discloses a pressure-controlled production device which is a cracking reactor, and an outlet of a raw material container is communicated with a top inlet of a reaction tube I after sequentially passing through a sample injection pump and a preheating tube; a bottom outlet of the reaction tube I is communicated with a top inlet of a reaction tube II after passing through a pressure control valve; a bottom outlet of the reaction tube II is sequentially connected with a product collection bottle and a tail gas absorption bottle after passing through a condensation tube; and a gas bottle for containing inert gas is communicated with a top inlet of the reaction tube II after passing through a rotor flow meter. The invention further provides a method for producing 3, 5-dimethylphenol by using the device, and isophorone is used as a raw material to carry out cracking reaction under the action of a bromine-containing catalyst. According to the invention, the reaction selectivityand conversion rate can be improved.

The invention provides a preparation method of a shell-core structure molecular sieve for biomass pyrolysis oil production, which comprises the following steps of: adding deionized water into a beaker, measuring a TPAOH solution, adding the TPAOH solution into the deionized water, weighing HZSM-5 molecular sieve powder, adding the HZSM-5 molecular sieve powder into the solution, quickly stirring,sufficiently stirring for 1 hour, weighing a template agent CTAB, adding the template agent CTAB into a turbid liquid, sufficiently stirring, fully stirring the turbid liquid, transferring the turbidliquid into a high-pressure reaction kettle with a tetrafluoroethylene lining, placing the reaction kettle in a drying oven, digesting for 24 hours, taking out the reaction kettle, adjusting the pH value to 8.5, transferring the solution back into the high-pressure reaction kettle, crystallizing for 24 hours in the drying oven, filtering and washing the obtained solution containing the crystal grains, drying the filtered crystal grains in the drying oven, putting the dried molecular sieve into a muffle furnace, heating the muffle furnace to 550 DEG C at a heating rate of 10 DEG C/min, and roasting for 2-6 hours to remove the template agent, thereby obtaining the mesoporous-microporous composite molecular sieve with a core-shell structure.

The invention provides a preparation method of a silver-loaded selectivity-changeable polymer catalyst. According to the preparation method, functional monomers involved in the method are a binary copolymerization functional monomer system for constructing a polymer molecule recognition framework and a movable functional group side chain structure. A substrate and an active component silver precursor are first dissolved in dimethyl sulfoxide for complexing, then the functional monomers, a crosslinking agent and an initiator are added, nitrogen is injected into the solution for deoxidation, the mixture is sealed and put under an ultraviolet lamp to be irradiated for polymerization initiation, and then a catalyst precursor is formed; Ag ions in the catalyst precursor are subjected to sodium borohydride reaction, an obtained product is washed repeatedly with water and ethylene alcohol to remove blotted substrate molecules, and the silver-loaded selectivity-changeable polymer catalyst is obtained after vacuum drying. The silver-loaded selectivity-changeable polymer catalyst can be used for direct preparation of aminobenzyl alcohol from an isomer mixture of nitrobenzyl alcohol and other industrial raw materials. The preparation method has the advantages of being simple in technical principle, making raw materials obtained easily, convenient to operate and making preparation easy.