476 results about "Catalytic function" patented technology

The invention provides a catalyzed soot filter formed on a wall flow substrate having internal walls coated with catalyst compositions. The soot filter maintains a homogeneous flow of the exhaust gases through the internal walls of the substrate along the length of the filter due to the coating design. Both the efficiency and the durability of the catalytic function are increased over conventionally designed catalyzed soot filters. The catalyzed soot filter provides an integrated function for simultaneously treating the gaseous components of the exhaust (e.g., CO and HC) and the particulate matter deposited in the filter.

A catalyst for purifying exhaust gases of a diesel engine. The catalyst contains two functional layers superimposed on an inert supporting body, whereby the first layer, which is situated directly on the supporting body, has a nitrogen oxide storage function and the second layer, which is in direct contact with the exhaust gas, has a catalytic function. The second functional layer additionally has a hydrocarbon-storage function and its catalytic function is provided by catalytically active noble metals of the platinum group which are deposited in highly dispersed form on finely divided, acidic carrier materials. Nitrogen oxides in the oxygen-rich exhaust gas of a diesel engine can be converted with optimal utilization of the reductive constituents contained in the exhaust gas. For this purpose, no reducing agents going beyond the reductive components (carbon monoxide and hydrocarbons) which are contained as a consequence of incomplete combustion need to be added to the exhaust gas. Nevertheless, rates of conversion in respect of the nitrogen oxides are obtained, averaged over practical driving cycles, which lie distinctly above the rates of conversion of conventional reduction catalysts.

A structured catalyst for selective reduction of nitrogen oxides with ammonia using an ammonia-supplying compound. The catalyst is preferably used for exhaust gas treatment of diesel vehicles powered by diesel motors. The catalyst is characterized by the fact that it contains a reduction catalyst for selective reduction of nitrogen oxides with ammonia and a hydrolysis catalyst for the hydrolysis of urea, where the hydrolysis catalyst is applied in the form of a coating onto the reduction catalyst. By this arrangement of the two catalytic functions in one catalyst the exhaust gas system can be made very compactly and space saving. Moreover, advantageous synergistic effects result from the direct contact of the hydrolysis catalyst and the reduction catalyst.

The invention discloses a method for degrading organic substances or ammonia nitrogen by catalyzing persulfate through sludge biochar. The method includes the following steps that firstly, sludge is dried to obtain dried sludge, then the dried sludge is subjected to pyrolysis treatment for at least 2 h in the ammonia environment at 300-500 DEG C, and then sludge biochar is obtained after cooling; secondly, the sludge biochar and persulfate are put into sewage to degrade the organic substances or ammonia nitrogen in the sewage. By improving key preparation conditions of sludge biochar and increasing the application ratio of the sludge biochar and persulfate, under the catalytic function of the sludge biochar, persulfate can efficiently degrade the organic substances and ammonia nitrogen in sewage on the basis of catalysis and oxidization of sulfate free radicals, the problem of organic pollutant and the ammonia nitrogen pollution problem in sewage are effectively solved, and the degradation effect is good.

The present invention relates to the construction of an allosteric control module in which a catalytic RNA forms a part of or is linked to an effector-binding RNA domain or aptamer. These constructs place the activity of the catalytic RNA under the control of the effector and require the presence of an appropriate effector for activation or inactivation. The present invention provides means to identify useful effector molecules as well as their use to evolve cognate aptamers. The invention involves both the evolution of RNA sequences which bind the effector and a selection proces in which the allosteric control modules are identified by their catalytic function in the presence and absence of the effector. The resulting regulatable catalytic RNAs may be used to alter the expression of a target RNA molecule in a controlled fashion.

The invention discloses an ozone-catalytic functional ceramic membrane, a preparation method thereof and a circulating coating device, relates to the technical field of membrane material preparation, and aims at solving the problems that the ozone-catalytic efficiency of the existing ceramic membrane is low, the integration of membrane filtration and ozone-catalytic functions cannot be realized, membrane pollution cannot be effectively relieved and the like. By using a tubular ceramic membrane as a carrier, single-component or multi-component metal oxides are loaded through an impregnation method, then manganese oxide dipping coating solution is prepared, and a catalytic coating layer is prepared on the surface of the membrane through a layer-by-layer dipping coating method. The invention aims at establishing a stereoscopic multistage catalyst system, simultaneously improving the catalytic efficiency of the separation layer and supporting layer of the ceramic membrane and enabling an ozone-catalytic effect to seep into the entire ceramic membrane to fully realize the overall catalytic effect. Compared with other metal oxides, manganese oxide has better adsorption and ozone-catalytic capacities, and while the ozone-catalytic capacity is improved, the membrane pollution is effectively relieved and the integration of multiple functions such as pollutant adsorption, ozone-catalytic oxidization and membrane separation is realized.

An exhaust gas purifying catalyst includes: a catalyst particle unit having at least noble metal with a catalytic function, first oxides on which the catalyst noble metal is supported, and second oxides covering the first oxides on which the noble metal is supported. In catalyst powder formed of an aggregate of plural pieces of the catalyst particle units, at least one type of compounds selected from the group consisting of a transition element, an alkali earth metal element, an alkali metal element, and a rare earth element, which is a promoter component, are contained.

The technical field of the invention is material chemistry, nanoscience, catalytic chemistry and medicine, and particularly relates to the preparation of magnetic nanocrystals with high solubility and high crystallinity in neutral water by a "one-pot" method and a preparation method thereof. Its main technical feature is the use of solvothermal decomposition of organometallic precursors or metal-inorganic salt compounds with high boiling point, catalytic function, reduction function and polymerizable function, while forming magnetic nanocrystals, realizing water-soluble polymers on the surface of nanocrystals The in-situ modification of the soluble magnetic nanocrystals with high solubility is obtained. Its main feature is that it can be dissolved in neutral water (pH=6~8), and the formed solution has long-term stability; its main inorganic components include iron, Cobalt, nickel, manganese and their oxides; their shape is spherical or petal-shaped; their shape and size are controlled by controlling the concentration and heating time of the precursor of the magnetic nanocrystal-organic precursor or inorganic salt.

The Diffusive Plasma is for effective treatment of contaminated air and material processing. Air is purified and disinfected by passing through the diffusive plasma device which includes a reactor or a plurality of reactors arranged in parallel or series and is energized by a high voltage alternating current power supply. The diffuser, being electrically isolated, provides extra nucleation sites to initiate discharges. It serves to improve the generation of uniform and consistent plasma and to reduce the variation of discharge properties among the reactors. The addition of a diffuser, thereby, enhances the overall effectiveness of decomposing chemicals and destroying microbes to achieve high air treatment and material processing performance. The diffuser can be made of suitable filtering materials to additionally serve as a filter. By incorporating suitable catalytic materials with the diffuser, the reactor becomes a catalytic plasma reactor wherein the plasma environment provides enhanced catalytic functions. Effective plasma power deposition may be obtained by controlling the amplitude, waveform period and shape of the voltage applied to the electrodes of the reactor and hence the operation of the reactors with plasma discharged of selected conditions for optimizing the treatment and processing efficiency while minimizing the generation of unwanted bi-product gases. The present invention also relates to a method for effective air treatment and material processing.

The invention discloses a method for preparing a graphene film, comprising the steps of activating carbon atoms in carbon-containing gaseous carbon source, solid carbon source and liquid carbon source or a mixed carbon source material of any two or more than two of the carbon sources by adopting the technical methods of energy particles such as laser beam, electron beam, radio frequency beam, radial, photon, neutron beam, ion beam, plasma and the like; and forming the graphene film on a substrate. The method for producing the carbon atoms needed in the graphene film synthetizing is different from a conventional method and has the advantages that the method has great selectivity, and has no special requirement on the carbon source material and no special requirement on the substrate; the graphene film can be synthetized on the substrate which has the catalytic function and can be directly synthetized on the semiconductor or insulator substrate which does not have the catalytic function; and the formed graphene film is easily controlled in the aspects of the number of layers, structure and size and suitable for manufacturing high-performance photoelectronic devices on a large scale.

The invention provides a cracking furnace tube for cracking petroleum hydrocarbon. The furnace tube contains active components for performing catalytic cracking reaction on the petroleum hydrocarbon and has catalytic cracking activity. The components of potassium aluminate, calcium vanadate, alkaline earth metal, transition metal oxide, silicon-aluminum zeolite and the like which have catalytic activities, and/or the components of alkali metal and the like with coking resistance, are added or adhered to the inner side or the surface of the tube, or are added directly in the process of manufacturing the tube by the methods of coating, infiltration, sintering, plasma spraying and the like so as to obtain the tube which is provided with an inner surface coating, or contains the components with catalytic activities in the whole tube from the inside to the outside, and/or contains the components with coking resistance. Using the furnace tube, the prior ethene device is not necessary to be changed at all, only the furnace tube which has the catalytic function or the furnace tube which is in the cracking furnace is processed, thus the industrialization can be achieved quite easily in theprior cracking device.

The invention discloses a method for treating recycled printing and dyeing sewage, which is applicable to the treatment and reutilization of sewage of printing and dyeing of fabrics such as wool fabrics, silk fabrics, cotton, linen, chemical fiber fabrics and the like. The method aims to overcome the disadvantages of sewage treatment of the prior printing and dyeing mills and ensure that the sewage reaches the national discharge standard of water pollutants for dyeing and finishing. The method adopts treatment technology of physicochemical-biochemical, precipitation and filtration, which comprises the following process flow: the sewage, a collecting basin, an anaerobic tank, an aerobic tan, a dosing tank, a sedimentation tank, a filter tank, and the discharge or recycling of water which achieves the standard. In addition, complex enzyme is also added; the complex enzyme has a catalytic function, and can strengthen the activation of microorganisms; the method has good treatment effect on the sewage; and the adding of the complex enzyme can strengthen the activity of the microorganisms, improve the effect of sewage treatment, can also save electric energy, reduce the loss of medicaments, and save the cost. The sewage is recycled after the filtration through a microstrainer, which saves the resource, reduces the cost once again, and truly achieves the aims of energy conservation and discharge reduction.

The invention relates to a microbialactivity enhancing liquid agent for sewage treatment. In the liquid agent, on one hand, a carrier, enzyme and a nutrient substance capable of promoting a catalytic function of sludge zoogloea are combined with one another, so activity of beneficial microorganism in sludge is enhanced and organic pollutants and the like are catalytically decomposed quickly; and on the other hand, the carrier enhances sewage biological treatment capacity by improving a structure of the sludge zoogloea. The liquid agent has the characteristics of convenience of use, small using amount, high-efficient and quick reinforcing ability and can be applied to biological treatment units for domestic sewage and industrial wastewater treatment.

This invention involves magnetic solid base catalyst, its components including magnetic material and metal oxide or magnetic vector with a mixture of metal salt as a catalyst, activity group is alkali metal salts. Their preparation methods: magnetic material and metal oxide or metal salts fully mixed grinding and dispersed evenly to join the binder, and then roasted and insulation, get a magnetic catalyst carrier; put active component into deionized water prepared impregnating solution; Magnetic catalyst carrier parked in the above impregnated solution to response, static aging, drying, calcination and insulation, then get a magnetic solid base catalyst. The invention magnetic solid base catalyst production process is simple, low cost, used for the preparation of the bio-diesel in transesterification reaction, catalytic function is superior, separation and recovery is convenient after transesterification reaction.

A supported catalyst having an atomic level single atom structure is provided such that substantially all the catalyst is available for catalytic function. A process of forming a single atom catalyst unto a porous catalyst support is also provided.

The invention discloses a fiber sizing agent and in particular relates to a fiber sizing agent having a catalytic function and a process for preparing a fiber structure by adopting the fiber sizing agent. The fiber sizing agent comprises one or more of an oxidation catalyst, a reduction catalyst, a synthesis catalyst, a photocatalyst and a high-temperature catalyst, and also comprises an antistatic agent, a resin film-forming agent and a silane coupling agent. The fiber sizing agent having the catalytic function is adopted to provide mechanical strength, flexibility, lubricity and the like, and also enable the produced fiber products to immediately have the capability such as the catalytic property, and therefore, the production step is remarkably reduced, the process time is shortened and the production energy consumption and the cost are reduced; besides, the catalyst is attached on the surface of the fibers together with the fiber sizing agent; the treating liquid can be utilized efficiently and the waste is minimized, and the catalyst is distributed evenly in every part of the fiber products; in short, the effective exposed area is large and the catalytic efficiency is relatively high.

The invention discloses a metal sulfide electrode with a hydrogen reduction catalytic function and a preparation method of the metal sulfide electrode, belonging to the fields of inorganic chemistry and catalysis. The electrode contains metal titanium, porous anatase TiO2 nanotubes grown on the surface of titanium and metal sulfide nanoparticles loaded on the surfaces of the nanotubes. The preparation method comprises the following steps: firstly preparing the anatase TiO2 nanotubes with a porous structure on the surface of metal titanium by an electrochemical anode oxidation method; then placing the TiO2 nanotubes into a solution containing molybdenum ions or tungsten ions, and irradiating ultraviolet light on the surface; and reducing the molybdenum ions or the tungsten ions by utilizing the photocatalytic reduction of the TiO2 nanotubes under the ultraviolet light to generate MoS2 or WS2 nanoparticles. The metal sulfide electrode prepared by the preparation method disclosed by the invention shows hydrogen reduction catalytic activity and has the characteristics of low cost, simple preparation method and environmental friendliness. In the metal sulfide electrode disclosed by the invention, a metal sulfide catalyst is directly loaded on a conductive porous substrate to form the electrode and can be directly applied to hydrogen reduction reaction, and the catalyst particles do not need to be fixed.

The invention relates to a catalyst for hydrogen production by catalytic reforming with biological oil and a preparation method. The catalyst comprises catalyst active components and a catalyst carrier; the catalyst active components refer to the following components in percentage by weight of 10-15 wt% of Ni, 5-13 wt% of Mo, 5-10 wt% of Fe and the balance being attapulgite and sepiolite mixed clay pit catalyst carrier. The catalyst provided by the invention has the advantages of large surface area, strong absorption function and strong promotion function; the cheap and easiest available attapulgite and sepiolite mixed clay pit are used as the catalyst carrier; and the catalyst active components comprise nickel, molybdenum and iron composite components, so that the molecules of the biological oil are subjected to splitting and chain scission to form high-quality synthesis gas of low-molecule hydrocarbon and high-content hydrogen. The catalyst provided by the invention has the advantages of simple catalyst preparation, large strength, strong catalyst activity, and regeneration. Not only can the catalyst be used for hydrogen production by catalytic reforming with the biological oil, but also the catalyst can be applied to direct hydrogen production by catalytic gasification with biomass.

The invention discloses a preparation method of a ZSM-5 zeolite molecular sieve-coating cerium oxide composite material. Cerium oxide is dispersed in a mother liquor for synthesizing a molecular sieve by adopting an in-situ hydrothermal method, and hydrolytic condensation polymerization, two-step in-situ hydrothermal reaction, cleaning, drying and roasting are carried out based on the mother liquor containing the cerium oxide to obtain the molecular sieve-coating cerium oxide composite material. According to the prepared molecular sieve/cerium oxide composite material, the molecular sieve uniformly and compactly covers the surface of the cerium oxide, the specific surface area is high, the thermal stability and the oxygen storage and release property of the cerium oxide can be greatly improved, and the cerium oxide has the rich surface acidity. In addition, the cerium oxide also has the certain oxidization capacity to the molecular sieve, so that the carbon deposition prevention capacity of the molecular sieve is greatly improved, and the molecular sieve-coating cerium oxide composite material can be used as a two-function catalyst simultaneously having an acid catalytic function and an oxidization catalytic function. The composite material can be widely applied to the fields such as the reaction catalyzed by solid acid at high temperature, such as catalytic cracking, volatile organic pollutant catalytic combustion, and automobile exhaust catalytic purification (a three-way catalyst carrier and a hydrocarbon trapping catalyst).