316results about How to "Improve anti-poisoning performance" patented technology

The invention provides an SCR (selective catalytic reduction) catalyst for denitrating low-temperature smoke of a cement kiln and a preparation method thereof. The SCR catalyst is characterized in that by adjusting the technological conditions such as proportions of active components, mass ratio of carriers and active components, calcining temperature and the like, a composite metal oxide which is formed by one or more metal elements out of manganese (Mn), ferrum (Fe), copper (Cu), cerium (Ce), lanthanum (La), bismuth (Bi), niobium (Nb), tantalum (Ta) and the like is loaded on a carrier by adopting an impregnation method, and tungsten and molybdate are used as active assistants. The active components in the SCR catalyst are uniformly distributed on the surface of the carrier in an unformed shape, the low-temperature activity of the catalyst is improved by utilizing the synergistic effect of multiple metals, the SCR catalyst is particularly suitable for the denitration of the smoke which is discharged from a dust collector on the tail of the cement kiln, the denitration rate can reach higher than 70 percent at the temperature of 80 DEG C, the denitration rate is higher than 90 percent in the temperature range of 125 DEG C to 200 DEG C, and the toxicity resistance is strong.

The invention provides a denitration catalyst and a preparation method thereof. The denitration catalyst comprises: by weight, 40 to 45 parts of nano-titanium dioxide, 6 to 8 parts of nano-silica, 0.5 to 4 parts of ammonium metavanadate, 0.5 to 4 parts of ammonium paratungstate, 0.5 to 2 parts of Acesulfame K (A.K) sugar, and 3 to 5 parts of one or two moulding auxiliary agents. In the invention,trough the introduction of A.K sugar, the denitration catalyst has an excellent denitration performance and through the introduction of rare earth elements, an anti-poisoning performance of the denitration catalyst is improved greatly; the A.K sugar in the denitration catalyst has a binding effect and can improve effectively a mechanical property and a strength of the denitration catalyst thus ananti-crushing property of the denitration catalyst is improved and the problem that a denitration catalyst adopted by the prior art can be crushed frequently in use is solved.

The invention discloses a method for preparing a Cu-SSZ-13 catalyst through an in-situ synthesis method. A Cu-SSZ-13 molecular sieve sample is prepared by taking acid as an exchange reagent and treating through an in-situ synthesis method. Compared with the currently used ammonium nitrate ion exchange method, the after treatment method for the Cu-SSZ-13 molecular sieve prepared through an in-situ synthesis method is more environment-friendly and effective; the activity of the prepared catalyst is higher; and the hydrothermal stability is better. According to the method, the silica-alumina ratio of the molecular sieve structure is increased while the catalyst having high catalytic activity is obtained; and the obtained Cu-SSZ-13 catalyst has excellent hydrothermal stability, wide temperature window and excellent N2 selectivity, and is very applicable to purification of tail gas from diesel cars.

A material comprising a novolac resin having a C₆-C₃₀ aromatic hydrocarbon group substituted with a sulfo group or an amine salt thereof is useful in forming a photoresist undercoat. The undercoat-forming material has an extinction coefficient sufficient to provide an antireflective effect at a thickness of at least 200 nm, and a high etching resistance as demonstrated by slow etching rates with CF₄/CHF₃ gas for substrate processing.

The invention provides a mercuric chloride low-mercury catalyst and a preparation method thereof. The catalyst adopts active carbon as a carrier to adsorb mercuric chloride, and the formula of the catalyst comprises 8.0 to 10.0 percent of mercuric chloride, 8 to 13 percent of rare earth chloride assistant A, 5 to 25 percent of alkaline earth metal chloride assistant B, 10 to 20 percent of assistant C, and the balance of active carbon. The preparation method comprises the following steps: firstly, soaking the active carbon in hydrochloric acid solution at low temperature for standby; simultaneously dissolving the mercuric chloride, the assistant A, the assistant B and the assistant C together, and soaking the active carton in the solution; performing low-temperature pre-drying on an intermediate product; continuously drying the catalyst; and finally pumping a product at vacuum into a storage silo, packaging and leaving factory. The catalyst can reduce resource consumption and the pressure of treating mercury pollution; simultaneously the production cost is reduced, the poisoning resistance, reduction resistance and loss resistance are greatly improved, the catalytic performance of the catalyst is fully guaranteed, the using time can be prolonged and the using consumption can be reduced; and the catalyst is suitable for polyvinyl chloride manufacturers.

A catalyst of removing the NOx, residual organic substance and CO from the oxygen-enriched tail gas from engine contains the porous inorganic carrier, silver, noble metal chosen from Au, Pt, Pd, Ph, Ir and Ru, and other metal chosen from Fe, Cu, Ti, Zr, Ba, Sn, W, Zn, Mo, Ce, Cs, La and Ca.

The catalyst includes alumina, RE metal oxide, composite Al-La oxide, and active metal Pt, Pd and Rh. It features that the mixed oxide grain with aluina, cerium oxide and Al-La oxide carries at least one of Pt and Pd as well as Rh. The mixed oxide grain is prepared through dissolving salt of Al, Ce and La in water, adding NH3OH to produce precipitate, and heating to decompose the precipitate. The catalyst preparing process includes carrying mixed oxide grains onto the carrier, carrying least one of Pt and Pd onto the mixed oxide grains, and carrying Rh finally. The catalyst is especially suitable for purifying automobile tail gas of gasoline engine near the theoretical air/fuel ratio, and has the features of lasting use, less noble metal consumption, high purifying efficiency and powerful sulfur poison resistance.

The invention provides a catalyst for removing traces of oxygen in catalytic cracking dry gas, which is characterized in that the catalyst contains catalytic active components and a carrier, wherein the catalytic active components consist of main catalytic active components and auxiliary catalytic active components; the main catalytic active components are palladium; based on the weight of the catalyst, the palladium content is 0.01 to 0.5 percent; the auxiliary catalytic active components are one or more of Ag, Au, Co and Cr; the content of the auxiliary catalytic active components is 0.05 to 1.0 percent; the carrier is alumina, activated carbon, silica or zeolite; and the catalytic active components are distributed in an eggshell-like state on the surface of the carrier. The catalyst has the deoxidation depth up to 0.1 ppm at high space velocity, and has the characteristics of strong anti-poisoning capability, reaction bed insusceptible to temperature runaway, and the like.

The present invention relates to an applicable load-type catalyst for purifying air at room temperature using copper, manganese and cerium as active ingredients and nano-palygorskite or nano-sepiolite powder as carriers, wherein contents of the copper, manganese and cerium account for 15%-40% of the total mass with a molar ratio of 1: 1: 1-1: 2: 4; and preparation technology includes a ultrasonic dispersion step for 1 hour, a stirring step at 30-50 DEG C for 2-4 hours, drying and activating steps at 110-120 DEG C for 5-10 hours, a calcination step in a muffle furnace at 500-800 DEG C for 3-6 hours, and a grinding step until a fineness is equal to or less than 20 microns. The applicable load-type catalyst is super strong in adsorption capacity, can continuously and effectively remove benzene, toluene and xylene (BTX), formaldehyde, CO, NO, SO2 and other harmful gases in the air, is high in processing efficiency, low in cost and wide in economic applicability, does not produce secondary pollution, and is suitable for the removal of pollutants at home, offices, hotels, conference rooms, furniture shopping malls, building material markets and other space.

A catalyst for catalytic combustion features that a coated composite oxide layer based on CeO2 is carried by cellular ceramic carrier. It contains the cellular cordierite ceramic matrix, coated composite oxide layer based on CeO2, and Pd. Its preparing process is also disclosed.

A process for preparing the anode catalyst Pt/PANI/MWNT able to be directly used for methanol fuel battery includes such steps as adding sulfuric acid solution containing disperser into container, adding multi-wall carbon nanotubes, ultrasonic oscillating, adding phenylamine and ammonium persulfate solution, reacting, washing, baking to obtain polyphenylamine/multi-wall carbon nanotubes carrier, adding additive contained buffering solution of acetic acid, ultrasonic oscillating, adding chloroplatinic acid solution, continuous oscillating while heating and dropping sodium borohydride solution, reacting, filtering, washing and baking.

The invention provides a preparation method of a multifunctional desulfurizer for hydrolyzing, absorbing and deoxidizing organic sulfur. The preparation method comprises the steps as follows: adding activated carbon to a mixed solution of Zn(NO3)2, Fe(NO3)3 and first active aid soluble salt, performing ultrasonic equivalent-volume impregnation and microwave roasting to obtain first semi-finished catalyst powder, adding an acetic acid aqueous solution to an isopropanol solution of aluminum isopropoxide and tetrabutyl titanate, and performing microwave roasting to obtain Al2O3-TiO2 composite carrier powder; adding an Al2O3-TiO2 composite carrier to a second aid soluble salt solution, performing ultrasonic equivalent-volume impregnation and microwave roasting to obtain second semi-finished catalyst powder, evenly mixing the first semi-finished catalyst powder, the second semi-finished catalyst powder, a binder, a the pore forming agent and water, and performing extrusion forming, drying and microwave roasting to obtain the multifunctional desulfurizer. The multifunctional desulfurizer has the advantages of efficiently hydrolyzing, converting, absorbing and deoxidizing the organic sulfur.

The invention provides a preparation method of a non noble metal catalyst for cathodic oxygen reduction reaction of a fuel cell and belongs to the technical field of electrode catalytic materials. The preparation method comprises the steps as follows: in a protonic solvent, mixing dipyridine with a carbon nanotube according to a mass ratio of (20 to 1) to (1 to 1), ultrasonically dispersing and stirring for 20 to 50 min respectively, adding metal salt which is 1 to 20 times the carbon nanotube in mass, strongly stirring for 1 to 5 h, evaporating to removal the solvent, drying, grinding, placing into a tubular furnace, adding nitrogen for heat treatment, grinding, then treating with an acid solution, carrying out suction filtration, washing and drying so as to obtain the non noble metal catalyst. The non noble metal catalyst prepared by the preparation method has the advantages of low cost, high activity, high poisoning resistance and good stability in comparison with the traditional noble metal catalyst, and is an ideal catalyst for the cathodic oxygen reduction reaction of the fuel cell.

The invention discloses a method for preparing a nanometer platinum nickel/titanium dioxide nanotube electrode by cyclic voltammeter electrodeposition, and belongs to the technical field of photoelectrocatalysis. A titanium dioxide nanotube array, tidily arranged and vertically oriented, is prepared on a titanium chip by adopting an anodic oxidation method; and then, nanometer metal particles are deposited in nanotubes and on the surfaces of the nanotubes by adopting a cyclic voltammeter electrodeposition method to prepare a nanometer platinum/nickel modified titanium dioxide nanotube electrode. An electrocatalyst preparation method needs no surface active agent, stabilizing agent or functional component in deposition, is simple in process, and is uniform in nanoparticle dispersion; and the prepared electrode can obviously reduce the toxicity of catalyst and improve the electro-catalytic property of the electrode, and is wide in application prospect.

The invention discloses a vanadium oxide nanotube denitration catalyst with anti-poisoning performance and a preparation method of the catalyst. The catalyst is prepared from a carrier as well as an active substance and a catalysis aid which are supported on the carrier, wherein the carrier is a vanadium oxide nanotube, the active substance is at least one of oxides of cerium, niobium, iron, copper, chromium, cobalt and manganese, and the catalysis aid is oxide of molybdenum or tungsten. The catalyst has a good inhibition function on poisoning effects of phosphate, heavy metals, alkali metals and alkaline-earth metals.

The invention discloses a palladium/nitrogen-doped graphene composite electrode catalyst and a preparation method thereof. The preparation method comprises the following steps: carrying out ultrasonic dispersion on oxidized graphene in water, adding tripolycyanamide, heating and stirring the mixture, freezing and drying the mixed system and carrying out high-temperature heat treatment, so as to obtain nitrogen-doped graphene; carrying out ultrasonic dispersion again on the nitrogen-doped graphene in an ethylene glycol solution, adding a palladium nitrate solution to the ethylene glycol solution and mixing the mixture evenly; reducing palladium nitrate by virtue of a mild reduction method, and depositing palladium nanoparticles in-situ on the surface of the nitrogen-doped graphene; and after reaction is ended, carrying out centrifugal separation to obtain a solid product, and washing and drying the product to obtain the catalyst. By virtue of the mild reduction method, the palladium nanoparticles are deposited in-situ on the surface of the nitrogen-doped graphene; and high temperature or high pressure is not needed, so that the preparation method is simple and controllable, and the repeatability is relatively good. The prepared palladium/nitrogen-doped graphene composite electrode catalyst has excellent electrochemical properties as a direct methanol/formic acid fuel cell cathode material.

The invention relates to a La1-X AgXMnO3 perovskite catalyst used to purify the vehicle tail gas, wherein the A of ABO3 structure of perovskite is formed by lanthanum and silver; the B is formed by manganese; 0.05<=X<=0.4; the total mol of lanthanum and silver, the mol of manganese and oxygen mol are rated as 1:1:3; via analyzing crystal phase, the perovskite structure is 95% of catalyst. The invention can adjust the ratio of lanthanum and silver to improve the application in different vehicle discharge systems. And the invention can effectively resist to the toxicity of lead and sulfur. And it has high thermal stability, with simple structure and low cost.

The invention discloses a catalyst for catalyzing methyl alcohol. The catalyst disclosed by the invention comprises graphene, a polyacrylic acid-ferrocene compound and metal nanoparticles, wherein the mass ratio of the grapheme to the polyacrylic acid-ferrocene compound and the metal nanoparticles is (20-50):(150-250):(1-15). The graphene is taken as a substrate material of the catalyst for catalyzing methyl alcohol disclosed by the invention; the polyacrylic acid-ferrocene compound can enter a layer structure of the graphene to inhibit the aggregation of the graphene; homogeneous nucleation of the metal nanoparticles is promoted by the polyacrylic acid, so that the loaded metal nanoparticles has a higher catalytic activity; due to a net structure of the polyacrylic acid, the graphene-polyacrylic acid-ferrocene has a multi-channel stereoscopic structure, the movement of the particles is buffered and the homogeneous growth of the metal nanoparticles is further promoted. Therefore, the catalyst for catalyzing methyl alcohol disclosed by the invention has the advantages of higher catalytic activity for methanol and higher capability of resisting the poisoning of an intermediate.

The invention relates to a preparing method of a catalyst for low-temperature denitrification, and belongs to the field of flue gas denitrification. The denitrification efficiency of the catalyst for flue gas at 150-420 DEG C is 95% or above. Raw materials for preparing the catalyst comprise 55-91 parts of superfine titanium dioxide, 1-10 parts of lanthanum nitrate, 1-5 parts of polyoxyethylene, 1-10 parts of cerous nitrate, 1-10 parts of zirconium nitrate, 0.05-10 parts of ammonium metavanadate, 0.05-15 parts of ammonium heptamolybdate, 0.05-10 parts of ammonium paratungstate, 1-5 parts of carboxymethylcellulose, 10-30 parts of deionized water, 1-15 parts of monoetanolamine and 1-5 parts of oxalic acid. The catalyst is characterized by high selectivity, high activity and strong poison resistance.

The invention discloses a high-anti-poisoning one-component pouring sealant for an LED driving power supply and a preparation method of the high-anti-poisoning one-component pouring sealant. The pouring sealant is prepared from 100 parts of vinyl polydimethyl siloxane, 100-300 parts of heat conducting fillers, 5-50 parts of a hydrogenous silicon oil crosslinking agent, 0.01-0.5 part of a curing inhibitor and 0.1-5 parts of a platinum complex catalyst. The preparation method comprises the following steps: sequentially adding the raw materials into a stirrer for uniformly mixing, and vacuum-removing air bubbles. The prepared pouring sealant is good in anti-poisoning property, is good in flowing property and operability during use, can fully fill superfine gaps in the LED driving power supply, is high in heat-conducting property and dielectric property after being cured, effectively improves the heat rejection efficiency of heating components of the LED driving power supply, and has good electromagnetic compatibility with the LED driving power supply. The reliability of the LED driving power supply can be improved, and the service life of the LED driving power supply is prolonged.