48results about How to "Uniform and firm load" patented technology

The invention provides a mercury-free catalyst applied to stationery bed for preparing chloroethylene and a preparation method thereof. The catalyst takes activated carbon, pretreated by hydrochloric acid or sodium hydroxide water solution, as a carrier, and gold trichloride and ferric chloride as active components, and compared with the ordinary mercury-free catalyst, according to the preparation method of the catalyst, the gold trichloride is guaranteed not to be reduced and can be uniformly and firmly loaded on the surface of the activated carbon carrier by replacing nitrohydrochloric acid in the preparation of the catalyst with hydrogen peroxide and taking other metal chloride, capable of promoting the decomposition of the hydrogen peroxide, as auxiliaries. The catalyst has high activity and selectivity in the reaction of preparing chloroethylene in the stationery bed through acetylene hydrochlorination, and the preparation method is simple and efficient, and green and environment-friendly, and has important practical significance in the industrial application.

The invention relates to an attapulgite-graphite-like carbon nitride composite ceramic microfiltration membrane with photocatalytic performance and a preparation method thereof and belongs to the field of ceramic membranes. The method comprises the steps of preparing casting solution slurry from titanate coupling agent modified attapulgite and melamine; and preparing a wet membrane of the ceramic microfiltration membrane through a dip-coating method, airing at a room temperature and roasting to prepare the attapulgite-graphite-like carbon nitride composite ceramic microfiltration membrane. A separation layer of the ceramic microfiltration membrane is prepared from attapulgite fibers and graphite-like carbon nitride and the attapulgite fibers are disorderly stacked into the separation layer, so that relatively large total porosity and superficial area are provided for the separation layer; coupling of photocatalysis and separation processes can be achieved by using the photocatalytic performance of the graphite-like carbon nitride, and self-cleaning of the membrane is achieved; and the graphite-like carbon nitride is uniformly and dispersedly immobilized on the surface of attapulgite of the membrane through the chemical bonding effect, so that the disadvantages that granular graphite-like carbon nitride is easy to aggregate, difficult to separate and difficult to reuse in the using process are effectively avoided.

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 relates to the technical field of electrochemical materials, in particular to a nanofiber-based flexible array structure electrode and a preparation method thereof. The nanofiber-based flexible array structure electrode is prepared from an inner layer spinning solution and an outer layer spinning solution through electrostatic spinning, carbonization, hydrothermal growth and electro-deposition, the inner layer spinning solution is prepared from polyacrylonitrile (PAN), purified terephthalic acid (PTA), acidized carbon nanotubes (AC-MWNTs) and a solvent, and the outer layer spinning solution is prepared from polyvinylpyrrolidone (PVP), inorganic zinc salt, PTA and a solvent. According to the preparation method of the nanofiber-based flexible array structure electrode, the flexibility of carbon fiber is improved, and ZnO can be directly added into a precursor in the coaxial spinning process, so that the outer surface of the carbon nanofiber is loaded with nano ZnO evenly and firmly, the seed crystal coating process is omitted, thus the method is simple, efficient, high in universality, low in cost and environmentally friendly, an obtained product integrates the flexiblecharacteristic and bimetallic pseudocapacitance performance, and can form an independent electrode.

The invention provides a method for preparing a binary denitration sulfur-resistant catalyst-loaded filter material by using a one-step in-situ synthesis method. The method provided by the invention is characterized in that the binary denitration sulfur-resistant catalyst-loaded filter material is prepared by taking a polyphenylene sulfide filter material treated by concentrated nitric acid as a catalyst carrier, potassium permanganate and cerous chloride heptahydrate as a catalyst precursor and deionized water is utilized as a solvent, and by using an in-situ polymerization method. The loaded filter material can be used as a dedusting agent and a denitration sulfur-resistant agent at the same time, and relatively good denitration sulfur-resistant performance can be achieved when the catalyst loading capacity is greater than 5mg/cm<2>.

Belonging to the technical field of photocatalytic material preparation, the invention discloses a preparation method of a TiO2 loaded nitric acid modified viscose-based activated carbon fiber cloth photocatalytic material. The method includes the steps of: taking a viscose-based activated carbon fiber cloth, placing it in a nitric acid solution, conducting constant temperature treatment at 80 DEG C, carrying out washing and drying, thus obtaining a nitric acid modified viscose-based activated carbon fiber cloth; treating the dried viscose-based activated carbon fiber cloth, placing it into a TiO2 emulsion, performing ultrasonic immersing loading, and implementing drying, thus obtaining the TiO2 loaded nitric acid modified viscose-based activated carbon fiber cloth photocatalytic material. The photocatalytic material provided in the invention can be directly used for purifying decorated living rooms, new cars and other places. The preparation method of the TiO2 loaded nitric acid modified viscose-based activated carbon fiber cloth photocatalytic material in the invention has the advantages of low cost and simplicity, and has a reaction conversion rate enhanced by nearly 3 times.

The invention discloses a method for preparing a Pt-based catalyst by pulse electrodeposition under ultrasonic conditions, and belongs to the technical field of electrodeposition. The method combinesadvantages of both pulse electrodeposition and ultrasonic conditions, and electrodeposits to prepare the Pt-based catalyst by separately preparing a desired salt solution as an electroplating solutionin an aqueous solution, an organic solvent or an ionic liquid, and using a carbon material as a carrier, and using a pulse power supply to set different pulse electrodeposition current densities, current on-off time ratios (ton/toff), temperatures and other process parameters. According to the invention, the method for preparing the Pt-based catalyst by combining the pulse electrodeposition withthe ultrasonic conditions is simple in process operation, environmentally-friendly and strong in condition controllability; and the prepared Pt-based catalyst is small in average particle size, largein specific surface area and firm to bond with the carrier.

The invention provides a composite nanofiltration membrane taking layered double hydroxides as modified templates and a preparation method, and relates to the technical field of separation membranes.The preparation method comprises the following steps: firstly, loading layered double hydroxides modified by polyphenol molecules on a support base membrane to form a modified support base membrane; and then carrying out interfacial polymerization reaction on the modified support base membrane. In the interfacial polymerization process, the loaded modified layered double hydroxides are favorable for forming an active separation layer with ultra-thin thickness and large effective area. Then, the modified layered double hydroxides are removed through acid solution etching, a large number of nanopores are formed in the connecting interface of the supporting base membrane and the active separation membrane, and the obtained composite nanofiltration membrane is excellent in separation performance and stable in structure and has industrial production and commercial application prospects.

The invention discloses a supported palladium-ultrathin CoNi-LDH (Layered Double Hydroxide) nanosheet composite material as well as a preparation method and application thereof. The preparation methodcomprises the following steps: firstly, preparing ultrathin CoNi-LDH nanosheets by using a one-step hydro-alcohol thermal-solvent method, and supporting noble metal Pd nanoparticles by the ultrathinCoNi-LDH nanosheets as a carrier so as to obtain the supported palladium-ultrathin CoNi-LDH nanosheet composite material. The composite material can be applied to an electrocatalytic ethanol oxidationreaction, and has the advantages of high mass activity, good stability, good anti-poisoning ability and the like. The advantages can be attributed to the following aspects: (1), the ultrathin carriercan provide a larger electrochemical activity area, good electrical conductivity, and good CO poisoning resisting ability; and (2), the Ni-based LDH carrier can remove carbonaceous intermediates nearPdNPs sites, the Co element which is highly dispersed in laminates can achieve uniform and solid loading of PdNPs and is beneficial to sufficient utilization of PdNPs, and thus catalytic activity andstability can be synergistically improved.

The invention belongs to the field of nano-materials and inorganic non-metallic materials and relates to attapulgite for UV protection and a preparation method thereof. Attapulgite carries rutile-type nanometer titanium dioxide, aluminum hydroxide and fatty acid. The alkali activated attapulgite is conducive to uniform and firm immobilization of rutile-type nanometer titanium dioxide on the surface of attapulgite. The protection material has good light stability (weatherability), can be used for outdoor organic polymer material UV protection and does not discolor. The hydrophobicity of the material surface improves dispersibility and compatibility in a nonpolar organic system.

The invention discloses a composite catalytic filter material for degrading dioxin at low temperature and a preparation method thereof, and belongs to the technical field of waste incineration tail gas treatment. The composite catalytic filter material loaded with a VOx-MnCeOx three-way catalyst is prepared by taking a high-temperature-resistant filter material as a catalyst carrier and the stepsof filter material activation, in-situ precipitation, V active component impregnation and low-temperature plasma oxidation. The catalyst has the advantages that (1) the catalyst has excellent low-temperature activity and selectivity on catalytic degradation of dioxin; (2) the active component V with high activity and excellent chlorine poisoning resistance is added into the filter material, and the V active component is effectively oxidized through low-temperature plasma, so that the catalytic activity and the chlorine poisoning resistance are improved; and (3) the catalyst is uniformly and firmly loaded on the surface of the filter material through an in-situ precipitation method, the preparation conditions are mild, the original performance and stability of the filter material are maintained, and the service life is long.

The invention provides a preparation technology for coating a filter material with an efficient denitration catalyst with a ring opening polymerization method. Firstly, a PPS (polyphenylene sulfide) filter material is pretreated with strong acid, so that more active oxygen-containing functional groups such as hydroxyl, carboxyl and the like are obtained on the surface. The PPS filter material can be used as a modified monomer due to existence of these oxygen-containing functional groups, then, acrylamide is uniformly dispersed on the PPS surface under the ultrasonic action, potassium permanganate is used as an initiator, a ring opening polymerization reaction is conducted on the PPS surface, meanwhile, a produced manganese catalyst firmly coats the PPS surface, and the compound filter material with the efficient denitration function is prepared.

The invention discloses a quaternary ammonium salt disinfectant concentration detection chemical indicator card and a preparation method thereof. The chemical indicator card comprises absorbent paper loaded with color-changing reaction active matter and a PVC carrier strip, the absorbent paper is further loaded with adjuvants including a leveling agent, a color fixing agent and a pH buffering agent, and the adjuvants are mixed according to a certain preparation sequence. The color-changing reaction active matter, the leveling agent, the color fixing agent and the pH buffering agent are firstly prepared into mother liquor, then the absorbent paper is soaked in the mother liquor, dried and pasted to the PVC carrier strip, and the chemical indicator card for detecting the concentration of the quaternary ammonium salt disinfectant is obtained and can be used for rapidly detecting the concentration of quaternary ammonium salt sterilization factors in the quaternary ammonium salt disinfectant. The invention is suitable for detection of sterilization factors when quaternary ammonium salt on the surface of an object in a hospital is disinfected, and the detection range is 0-1000 ppm.