45results about How to "Improve catalytic combustion performance" patented technology

The invention provides a broad-spectrum VOCs (Volatile Organic Compounds) catalytic combustion monolithic catalyst and belongs to the technical field of catalysts. The catalyst comprises monolithic cordierite honeycomb ceramic, an auxiliary agent coating and an active coating; the auxiliary agent coating is prepared from one of active aluminum oxide, lanthanum modified active aluminum oxide or cerium modified active aluminum oxide, a rare-earth oxide compound and a binding agent; the active coating comprises one or two of noble metal palladium or noble metal platinum. The invention further provides a preparation method and application of the catalyst. The broad-spectrum VOCs catalytic combustion monolithic catalyst provided by the invention has low ignition temperature and high conversionefficiency on methane, propane and common volatile organic compounds, such as benzene, toluene, xylol, acetone, methanol, ethanol, acetic acid and ethyl acetate; the broad-spectrum VOCs catalytic combustion monolithic catalyst has common applicability. The catalyst has low gas flow resistance, low concentration of the volatile organic compounds and a wide air speed application range.

The invention provides a method for preparing toluene catalytic combustion monolithic catalysts and application. The toluene catalytic combustion monolithic catalysts are Pd-based catalysts, a carrier for the toluene catalytic combustion monolithic catalysts is CeO2-Pr6O11/Al2O3, CeO2-Pr6O11 mixed oxide with different Ce/Pr molar ratios is researched, accordingly, the optimal Ce/Pr proportions of the CeO2-Pr6O11 mixed oxide with the highest activity are found, and the toluene catalytic combustion monolithic catalysts are optimal in toluene catalytic oxidation activity when the Ce/Pr proportions are equal to 4:1. The method and the application have the advantages of excellent catalytic performance, low precious-metal content, good thermal stability and uniform coating.

The invention discloses a result-controllable organic waste gas treatment device adopting catalytic combustion. The result-controllable organic waste gas treatment device comprises a waste gas storage tank, a pretreatment unit, a preheating unit and a catalytic combustion unit, wherein the preheating unit comprises a heat exchanger and a preheater which are connected sequentially, a low-temperature pipeline and a high-temperature pipeline are arranged in the heat exchanger; the catalytic combustion unit comprises a fixed bed catalytic reactor which comprises a catalyst carrier and an active component, the catalyst carrier adopts a ceramic honeycomb structure, the active component is rare earth oxide, and a gas outlet of the high-temperature pipeline is connected with a gas concentration monitoring device II. The catalyst is cheap, easy to obtain, durable, safe, energy-saving and environment-friendly, a processing result is controllable, and the device is suitable for being popularized and used in organic waste gas treatment.

The invention discloses an integrated catalyst applied to catalytic combustion of methane and a preparation method thereof. The integrated catalyst comprises a carrier and an active coating arranged on the carrier, wherein the active coating is prepared from rare earth composite aluminum oxide loaded with Pd and rare earth composite molecular sieve loaded with Pt according to a weight ratio of (1 to 1)-(5 to 1). The integrated catalyst can be applied to catalytic combustion of low-concentration methane; the active coating is prepared by mixing rare earth composite aluminum oxide loaded with Pd with rare earth composite molecular sieve loaded with Pt. The preparation method is simple and practicable; the prepared catalyst is high in activity and has an excellent catalytic combustion effect on methane.

The invention relates to the field of chemical industry and environmental protection, and aims to provide a precious metal low-load catalyst for VOCs (volatile organic chemicals) catalytic combustionand a preparation method. According to the catalyst, spherical aluminum oxide or a cordierite honeycomb ceramic serves as a carrier, 50-250g/m<3> of precious metals are loaded on the carrier to serveas main catalysts, 200-5000g/m<3> of transition metals or rare-earth elements serve as co-catalysts, 150-1000g/m<3> of alkaline metals or alkaline-earth metals serve as modifiers, and the precious metals include one or more of Pd, Pt, Rh or Ru. The transition metals, rare-earth metals and the alkaline metals or alkaline-earth metals are added and cooperate with the precious metals to jointly catalyze VOCs to degrade, the catalytic performance of the catalyst is improved, and the catalyst still has a good catalytic combustion performance even if the load of the precious metals is reduced. The catalyst is used for VOCs catalytic combustion and has the advantages of low VOCs treatment initiation temperature and high removal rate. Compared with a common commercial precious metal catalyst, theusage amount of the precious metals can be reduced by 25%, and the catalyst has quite remarkable advantages and economic benefits.

The invention relates to the technical field of catalyst preparation, and discloses a cobalt-aluminum composite oxide catalyst and a preparation method and application thereof. The preparation methodcomprises the steps that metal salt solutions of cobalt and aluminum are taken as precursors correspondingly, polymer microspheres are taken as a template agent, templates are soaked in the precursorsolutions, then impregnation and roasting are conducted, and thus the cobalt-aluminum composite oxide catalyst is obtained. A three-dimensional ordered hierarchical pore structure with a mesoporous and macroporous structure is created through the polymer microspheres, thus the specific surface area of the catalyst is increased, the prepared catalyst has a large transmission pore channel, reactantmodules enter the pore channel from all directions advantageously, the diffusion resistance is lowered, thus the convective mass transfer efficiency between gases is improved, and the catalytic activity of the cobalt-aluminum composite oxide catalyst is facilitated; and meanwhile, through the large transmission channel, the situation that the modules are blocked when reacting on the pore wall or the pore channel of the transmission channel, and consequently, the reaction progress is influenced can further be effectively avoided, and the catalytic conversion efficiency of the catalyst is improved.

The invention discloses a monolithic catalyst for methane catalytic combustion and a preparation method thereof. The monolithic catalyst comprises a carrier, a coating on the carrier, and precious metal loaded on the coating, wherein the carrier is cordierite honeycomb ceramics, and the coating is a gamma-Al2O3 sol transition coating and a CeO2-Y2O3 sol assistant coating. The preparation method comprises the steps of impregnating the cordierite honeycomb ceramics in gamma-Al2O3 sol, drying and roasting to obtain a carrier coated with the gamma-Al2O3 sol transition coating; impregnating the carrier coated with the gamma-Al2O3 sol transition coating in CeO2-Y2O3 sol to obtain a carrier; and with Pd sol as an active ingredient, and coating the carrier with the Pd sol to obtain the monolithic catalyst, wherein the loading amount of the palladium accounts for 0.05-0.2 percent of the total weight of the monolithic catalyst, and the Pd sol is palladium nitrate sol, palladium acetate sol or palladium chloride sol. The monolithic catalyst has high catalytic combustion conversion rate to methane, and consumes few amount of Pd.

The invention discloses a processing technology of a special self-adhesive enameled wire for a household motor and a device. The processing technology comprises the steps of softening a copper bare wire through an annealing oven to obtain a copper wire A; sensing the copper wire A into a drying furnace for drying to obtain a copper wire B; coating the surface of the copper wire B with primer, sending the copper wire B into a first enamelling furnace, and drying the copper wire B for the first time in different temperature environments through the first enamelling furnace to obtain an enameledwire C; coating the surface of the enameled wire C with finish paint, then sending the enameled wire C into a second enamelling furnace, and drying the enameled wire C for the second time in differenttemperature environments through the second enamelling furnace to obtain an enameled wire D; and winding the enameled wire D to obtain a finished enameled wire. The working stability and the bondingeffect of the self-adhesive paint after being coated can be effectively improved according to the invention.

The invention provides a cerium-based rare-earth catalytic combustion improver. A preparation method of the cerium-based rare-earth catalytic combustion improver comprises the following steps of: forming a carrier by C16H35O4P and/or phosphorous or kerosene; dissolving rear-earth oxide in an H2SO4 or HCI solution to obtain rare-earth feed liquid; mixing the carrier and the feed liquid to obtain a load organic phase; and mixing the load organic phase and cerium-based rare-earth oxide to obtain the cerium-based rare-earth catalytic combustion improver. The invention also discloses the preparation method of the cerium-based rare-earth catalytic combustion improver. The cerium-based rare-earth catalytic combustion improver provided by the invention is low in cost and simple in preparation and operation processes, and the adjustable range of component parameters is wide. After the cerium-based rare-earth catalytic combustion improver is added, the heat value of fuel oil is increased by 10-15%, the content of CO, CH and NOx in discharged exhaust gas is reduced by 50-60%, an energy saving and emission reduction effect can be realized very well, and simultaneously carbon deposits can be effectively cleared away. The cerium-based rare-earth catalytic combustion improver is wide in the application range, has no side effects on equipment and is simple and convenient to add and operate.

The invention discloses a single-coated multi-component catalyst and a preparation method thereof. The single-coated multi-component catalyst comprises a porous matrix and a mixed catalytic coating, wherein the mixed catalytic coating is applied on the surface of the porous matrix and composed of a catalytic active component and a bonding component which are blended at (1-3): (3-1) by weight percentage. The single-coated multi-component catalyst is simple in preparation and high in high-activity VOCs (volatile organic compounds) combustion catalyzing performance. The preparation method comprises taking ethylene glycol as dispersion reducing agent, in-situ applying one or more types of metal particles onto a La/Y/Pr-doped-and-modified CeZrOx powder through pulsed microwave assisted chemicalreduction; then mixing the coated powder with the prepared bonding component, single-coating the porous matrix with the mixture, and performing drying and baking processes to obtain the target single-coated multi-component catalyst. With precious metal particles and other particles in a composite nano-structure, the prepared single-coated multi-component catalyst is excellent in catalytic activity; meanwhile, the preparation method of the single-coated multi-component catalyst is simple and rapid and accordingly is applicable to large-scale production and application.

The invention provides a waste gas treatment device for a screw extruder, and relates to the technical field of rubber regeneration equipment. The waste gas treatment device comprises a spraying chamber, a preheating chamber and a primary combustion chamber, wherein a pipeline for communicating the spraying chamber and the preheating chamber is arranged between the spraying chamber and the preheating chamber, and a first gas supply pipe for communicating the preheating chamber and the primary combustion chamber is arranged between the preheating chamber and the primary combustion chamber; thespraying chamber is communicated with an intake pipe, a plurality of spraying heads are arranged at the top in the spraying chamber, and a preheating electric heating pipe is arranged on the inner wall of the preheating chamber; a plurality of layers of catalytic beds arranged up and down are arranged in the primary combustion chamber, a combustion electric heating pipe is arranged on the inner wall of the primary combustion chamber, and the primary combustion chamber is further connected to a first outlet pipe. A plurality of small heat transfer pipes which are parallel to each other and arearranged above the catalytic bed at the uppermost layer are further arranged in the primary combustion chamber, and penetrate through the primary combustion chamber and are communicated with a main heat transfer pipe for connecting the small heat transfer pipes. When the device is used, waste gas can be effectively treated, waste gas emission is guaranteed to be clean and free of pollution, heat generated by waste gas combustion can be fully utilized, and the energy utilization rate is increased.

The invention relates to a modification method of an SCR catalyst for removing chlorobenzene in flue gas by catalytic combustion and a catalyst. The method comprises the following steps of: S1, preparing a vanadium-titanium catalyst, and grinding the catalyst to obtain vanadium-titanium catalyst powder; S2, preparing a modified precursor and adding the modified precursor into a water solution to obtain a modified precursor solution which comprises one or more of manganese, chromium, copper, zirconium, niobium and molybdenum; S3, adding the vanadium-titanium catalyst powder into the modified precursor solution to form a mixed solution; and S4, drying and calcining the mixed solution in the step S3 so as to obtain a modified catalyst of which the active component is one or more of oxides of manganese, chromium, copper, zirconium, niobium and molybdenum. According to the method, the vanadium-titanium catalyst is modified, the catalytic combustion performance of the vanadium-titanium catalyst on chlorobenzene is enhanced while the NOx removal performance is guaranteed, then cooperative treatment of industrial furnace flue gas NOx and chlorobenzene is achieved, and the industrial furnace flue gas treatment cost can be greatly reduced.

The invention relates to a flat enameled wire baking furnace which comprises a baking furnace body, a waste gas pipeline, a first fan, a first heat exchange pipe and a rotating device. By arranging the first fan and the first heat exchange pipe, external fresh air is input into the first heat exchange pipe, heat exchange is conducted through waste gas heat in the waste gas pipeline, then the heat is recycled into the baking furnace for use, and energy is saved. A plurality of branch pipes are used for conveying hot air into the baking furnace, so that the enameled wire can be uniformly heated, and a series of quality problems of products caused by excessive baking of one side of the enameled wire and insufficient baking of the other side are solved. The branch pipes are driven to rotate through the rotating device, so that all positions in the baking furnace can uniformly obtain heat of hot air output by the branch pipes, and the enameled wires in the baking furnace are further uniformly heated.

The invention discloses an efficient energy-saving device of a gas stove. The efficient energy-saving device of the gas stove comprises a combustion catalysis plate, a windproof cylinder capable of enclosing the whole flame, and support legs, wherein the combustion catalysis plate is of a combustion catalyst loaded porous plate and is mounted at the upper part of the inner wall of the windproof cylinder; the support legs are arranged at the lower part of the windproof cylinder. The efficient energy-saving device of the gas stove is simple in structure, high in effect and convenient to use; the windproof cylinder is capable of preventing wind from blowing away the flame; by virtue of the porous plate, fire can be uniformly distributed, so that the heat loss is greatly reduced; the catalyst is firmly attached onto the porous plate; the catalyst is long in contact time with the flame, large in contact area and high in catalytic combustion effect; the combustion is completed; the highest heat is released; the NOx and incomplete combustion products are reduced; the efficient energy-saving device has the advantages of being efficient and environmentally friendly, and has an energy-saving effect.