75results about How to "Facilitated Diffusion and Mass Transfer" patented technology

The invention relates to a method for improving the catalytic property of methane aromatization catalyst, belonging to the technical field of molecular sieve catalysis. The invention is characterized in that on the condition of no-second template, the crystal growth of zeolite molecular sieve is controlled by reasonablely controlling zeolite molecular sieve synthesis conditions such as synthesis formulation, charging sequence, ageing time, crystallization temperature, crystallization time and the like, small molecular sieve crystal is used for assembly and intergrowth to form MCM-22 and ZSM-5 molecular sieve assembly with multi-stage pore path structure, Mo or Re used can be adopted as active component to perform loading and modification to the prepared molecular sieve assembly, and the invention provides Mo-based MCM-22 and ZSM-5 molecular sieve assembly catalysts and an application thereof in methane non-oxidative aromatization reaction. The effects and the benefits of the invention is that the operation is simple, the cost is low and in methane non-oxidative aromatization reaction, the multi level structure assembly catalyst prepared by the method of the invention has better catalytic performance compared with the traditional catalyst.

The invention relates to a method for synthesizing a hierarchical pore zeolitic imidazolate framework 8 (ZIF-8) and application thereof in deep desulfurization of gasoline. The method comprises the following steps of: dissolving anionic surfactant into deionized water, adding an inorganic salt of zinc, adding 2-methylimidazole after the inorganic salt is dissolved, and mixing uniformly to obtain a sol-like substance; crystallizing the sol-like substance, and separating, washing and drying the solid product to obtain hierarchical pore ZIF-8 powder crystal; and extracting the anionic surfactant from the hierarchical pore ZIF-8 powder crystal by using a sodium hydroxide solution and an organic solvent as extracting agents, and thus obtaining the hierarchical pore ZIF-8. A preparation method for a corresponding deep desulfurization agent comprises the following steps of: preparing the hierarchical pore ZIF-8 according to the method for synthesizing the hierarchical pore ZIF-8; and dispersing the hierarchical pore ZIF-8 into an inorganic salt solution of copper, stirring, separating, washing and drying the solid product, roasting in a nitrogen atmosphere, and thus obtaining a copper-carrying hierarchical pore ZIF-8, namely the deep desulfurization agent.

The invention relates to a dephosphorizing agent and application thereof, belonging to the technical field of ferrous metallurgy. The dephosphorizing agent solves the problems of low dephosphorizing efficiency, high residue consumption, environment pollution and difficulty in resource comprehensive utilization in the existing calcium-oxide-based molten iron pretreatment dephosphorizing agent. The dephosphorizing agent comprises the following components in percentage by mass: 25-50% of FeOt, 20-45% of CaO, 15-30% of SiO2, 2-10% of Na2O and 3-12% of Al2O3. After being molten, the molten iron dephosphorizing can form a solid-phase / liquid-phase coexistent multiphase residue system at 1300-1400 DEG C, wherein the solid phase is a 2CaO.SiO2 phase capable of providing a place for enriching oxidized phosphorus in molten iron, so that the dephosphorizing agent has the characteristics of favorable dephosphorizing effect, low slag consumption, no fluorine and small environmental pollution and is beneficial to comprehensive utilization of dephosphorizing slag.

The invention relates to a preparation method of a gas diffusion electrode for producing formic acid by electrochemical reduction of CO2. The preparation method comprises the following steps: 1) adding anhydrous ethanol into powdery conductive carbon black till the powdery conductive carbon black is completely immersed, adding a polytetrafluoroethylene emulsion, performing reaction in a water bath, stirring till the formation of a lump, and then pressing by a roller to form a film, namely a diffusion layer film; 2) deoiling, acid-washing, tinning and drying a copper net to obtain a tinned copper net current collector; and 3) covering the diffusion layer film on the tinned copper net current collector, pressing by the roller, then cutting for formation, placing into a muffle furnace and calcining at the temperature of 3400 DEG C for 20-30min to prepare a target object. The preparation method provided by the invention has the advantages that according to the preparation method of the gas diffusion electrode, CO2 diffusion and mass transfer are strengthened by changing a CO2 transmission path and way of electrochemical reduction reaction of the CO2; and the preparation method has the advantages of simple process and low cost of raw materials, the prepared gas diffusion electrode has high mechanical strength, the electrochemical reduction efficiency of the CO2 is high, and the preparation method is suitable for engineering applications of electrochemical reduction of the CO2.

An energy saving anode used in electro-deposition of nonferrous metal is characterized in that the energy saving anode used in electro-deposition of nonferrous metal comprises a metal-conductive base-plate and at least one block of composite structure which is compounded by a metal layer with porous structure, wherein the structure is frame type, sandwich type and slab lattice type. The energy saving anode not only can effectively reduce true current density of the anode in electro-deposition of the nonferrous metal, reduce overpotential for oxygen evolution of the anode and lower energy consumption, but also can reduce the quality of the anode, reduce the creep deformation and the deformation of the anode, form a more dense oxydic film on the surface, reduce the corrosion rate of the anode, extend the service length of the anode and improve the quality of the cathode products. The energy saving anode can make a full use of the existing anode without changing the structure of the groove and have no effect to the process flow, and the energy saving anode has low preparing cost and low investment.

The invention relates to a preparation method of a high-loading active substance electrode. According to the method, a pore-forming agent is added in the preparation process of electrode slurry, the electrode slurry is applied to an aluminum foil current collector through coating equipment in a blade coating manner, an electrode-current collector integrated electrode is formed, the pore-forming agent is decomposed by the heat and volatilized in a gas form in the drying process, so that the electrode structure has a fluffy state, and a large quantity of pore structures are formed. The high-loading electrode having a fluffy porous structure and prepared with the method can effectively promote diffusion and mass transfer of sodium ions in the electrode, and particularly, diffusion of sodium ions at a high rate is intensified. Through battery performance tests, the performance of a sodium ion battery assembled by the high-loading active substance electrodes prepared by use of the pore-forming agent is substantially improved, and the performance is notably improved at a high rate.

The invention discloses a mesoporous carbon-loaded gold nano catalyst and application of the catalyst. A preparation method of the mesoporous carbon-loaded gold nano catalyst comprises the following steps of: (1) mixing SBA-15, gamma-aminopropyltriethoxysilane and ethanol, refluxing for 8-10h, filtering and drying to obtain amino-modified SBA-15; (2) mixing amino-modified SBA-15 with HAuCl4 aqueous solution, sufficiently stirring, and then adding KBH4 aqueous solution for reduction to obtain Au / SBA-15; and (3) uniformly mixing Au / SBA-15 obtained in the step (2) with phenolic resin ethanol solution, sufficiently immersing, carrying out primary drying, then transferring to a pipe furnace, carrying out high-temperature carbonization in nitrogen atmosphere at 600-900 DEG C, taking out obtained solid, and washing off the template SBA-15 to obtain the mesoporous carbon-loaded gold nano catalyst. The obtained mesoporous carbon-loaded gold nano catalyst can be used for hydrogenation reaction of nitrobenzene compounds, and has excellent reaction activity and selectivity.

The invention discloses a preparation method of an alumina supporter with the large porosity and high mechanical strength. Pseudo-boehmite and herba sesbaniae cannabinae powder are taken as raw materials, a peptizing agent is added, the mixture is subjected to extrusion molding, drying and three-section roasting, and the alumina supporter is obtained, wherein the crystal form structure is delta crystal form. The three-section roasting process comprises the steps that in the first section, the temperature is increased to be 850 DEG C from room temperature, and the temperature rising rate is 10DEG C / min; in the second section, the temperature is increased to be 900 DEG C from 850 DEG C, and the temperature rising rate is 5 DEG C / min; and in the third section, the temperature of 900 DEG C ismaintained for 4 hours. The pore diameter of the prepared alumina supporter is maintained between 150 and 200, the strength can reach 250 N / cm or above, the stacking density is lower than 0.60 g / mL,mass transfer of diffusion of macromolecular reactants is facilitated, and the catalytic activity of unit metal active site is improved.

The invention belongs to the technical field of fuel cells and particularly relates to a medium-temperature proton exchange membrane fuel cell membrane electrode and a preparation method thereof. Themembrane electrode comprises an anode microporous layer, an anode catalyst layer, a proton exchange membrane, a cathode catalyst layer and a cathode microporous layer which are sequentially arranged,and the anode catalyst layer and the cathode catalyst layer respectively consist of a hydrophilic catalyst layer and a hydrophobic catalyst layer. KAPPA-carbon black is contained in the anode microporous layer and the cathode microporous layer, and Pt / C catalysts are contained in the anode catalyst layer and the cathode catalyst layer. A binder used in the invention can improve the conductivity and proton transmission capability of an electrode; a used pore-forming agent enables the catalyst layers to obtain more uniformly distributed pores, the electrode can obtain more transmission channels,the reaction active area of the catalysts is increased, the power performance of the fuel cell is improved, vacuum heat treatment is adopted, the structural compactness of the catalyst layers is enhanced, the failure rate of the catalysts is reduced, and the service life of the catalysts is prolonged.

The invention discloses a millimeter level mesoporous ozone oxidation catalyst and preparation and an application method thereof, belongs to the technical field of water processing, and aims to solve the problems that the hydrodynamic performance of a conventional ozone oxidation catalyst is bad, the catalytic efficiency is low, and the stability is insufficient. The millimeter level mesoporous ozone oxidation catalyst comprises cerium, titanium, zirconium, and oxygen, is a millimeter level mesoporous spherical particle, has a unique crystal structure, at the same time, has the advantages of durable and stable catalytic activity, excellent hydrodynamic characteristics and pore structure, high compression strength, acid / alkali resistance, ligand stability, oxidation resistance, and thermal stability, and can prominently improve the mineralization degree of ozone oxidation. The valence composition of active components is not changed after repeated use. The preparation method comprises the following steps: preparing millimeter level mesoporous titanium-zirconium composite microspheres by a calcium alginate template method, and then combining cerium and the titanium-zirconium compound by an impregnation method. The provided catalyst can be applied to fixed bed reactor / fluidized bed reactor wastewater treatment, and can be thermally regenerated when pollutants are accumulated on the catalyst.

The invention discloses a regeneration process of operating fluid for producing hydrogen peroxide by an anthraquinone method, which comprises the following contents: in the presence of diluent gas, post-treatment operating fluid contacts with a regenerant for regeneration; the respective entering ways of the diluent gas and the post-treatment operating fluid into a regeneration bed are gas liquid cocurrent flow or gas liquid countercurrent flow. The method improves the contact regeneration effect of the post-treatment operating fluid with the regenerant, prolongs the service life of the regenerant of the operating fluid, and reduces the production cost.

The invention discloses micron-sized porous tungsten and a preparation method thereof, and belongs to the technical field of porous metal materials. The preparation method comprises the following steps: micron-sized pore-forming agent NaCl obtained through ball milling breaking, tungsten powder and an organic additive are added to an organic solvent for ball milling and tape-casting slurry is obtained, and after the slurry is subjected to tape casting, a thin strip is formed and is cut into the specific shape; the thin strips are laminated and then are put in a mould, low-temperature heat treatment rubber discharging is carried out in a vacuum, and then low-temperature hot pressing sintering is carried out in a vacuum and a green body is obtained; and the green body is placed in flowing deionized water for removing the pore-forming agent, the green body is put in a vacuum drying oven for drying and a porous tungsten green body is obtained, and the porous tungsten green body is subjected to high-temperature sintering at Ar atmosphere and the micron-sized porous tungsten is obtained. The density of the prepared porous tungsten is 35-90%, the pore diameters of large pores are 3-6 micrometers, the pore diameters of small pores are 0.1-0.7 micrometer, and the porous tungsten has the advantages that the pore distribution is uniform, the pore size is controllable, the porosity factor variation range is large, and the sintering temperature is lowered obviously.

A preparation method of a gas diffusion electrode for electrochemical treatment of SO2 comprises steps as follows: 1) powdery conductive carbon black is added to absolute ethyl alcohol until the carbon black is completely immersed, a polytetrafluoroethylene emulsion is added, the mixture is subjected to water bath treatment and stirred until clustered substances are formed, the clustered substances are rolled to form a film, and a diffusion layer film is obtained; 2) a stainless steel net current collector is covered with the diffusion layer film, rolling forming is performed, and the film is taken out for standby use after being calcined in a muffle furnace; 3) the powdery carbon black and a little quantity of carbon nanotubes are rolled to form a film with a method in the step 1), and a catalyst layer film is obtained; 4) the other side of the stainless steel net current collector is covered with the catalyst layer film, rolling forming is performed, and a target object is prepared. The preparation method has the advantages as follows: SO2 diffusion mass transfer is reinforced by increasing gas transferring pore channels of the electrode; a process is simple, the cost of raw materials is low, the mechanical strength of the prepared gas diffusion electrode is high, the reusability is good, the SO2 conversion efficiency is high, and the gas diffusion electrode is suitable for engineering application of electrochemical treatment of SO2.

The invention discloses a Pd-Mg / C catalyst for preparing 2,3-dichloropyridine by catalytic hydrogenation of 2,3,6-trichloropyridine and a preparation method of the Pd-Mg / C catalyst. The catalyst is prepared by the following steps: mixing and stirring Na2PdCl4 and MgCl2 with activated carbon carrier treated by hydrogen peroxide and hydrochloric acid in the presence of sodium tartrate, carrying outdrying, and then carrying out reduction by using H2 to obtain the Pd-Mg / C catalyst. The preparation process of the catalyst provided by the invention realizes that nano metal is highly dispersed on the carrier, the acid-base state of the surface of the catalyst is adjusted by an auxiliary Mg, the selectivity of the 2,3-dichloropyridine is improved, meanwhile, the interaction between the noble metal palladium and the carrier is enhanced, the stability is good, the reusability of the catalyst is improved, and the production cost is reduced.

The invention relates to preparation and an application of a high-loading active substance electrode. A method of solvent impregnating and freeze-drying is implemented, the solvent-impregnated high-loading electrode has a fluffy porous structure, and the stable fluffy porous structure is obtained through freeze-drying. The prepared high-loading electrode with the fluffy porous structure can effectively promotes diffusion and mass transfer of sodium ions in the electrode, and particularly, diffusion of sodium ions at a high rate is intensified. Through battery performance tests, the performanceof a sodium ion battery assembled by the prepared high-loading active substance electrodes is substantially improved, and the performance is notably improved at a high rate.

A preparation method of a hierarchical pore carbon-based catalyst for catalytic reforming of coal tar belongs to the technical field of preparation of catalysts for catalytic reforming of coal tar, and can solve a problem that the large diffusion resistance of existing microporous carbon-based catalysts having a small pore size is not conducive to the proceeding of a catalytic reaction. The methodcomprises the following steps: carrying out steam activation on low metamorphic coal under the catalysis of a calcium-containing mineral matter to obtain semi-coke with a hierarchical pore structure,and using the semi-coke with the hierarchical pore structure as a carrier to support an active metal in order to prepare the carbon-based catalyst with a hierarchical pore structure. The catalyst hasdeveloped microporous and mesoporous structures, so the diffusion of heavy components in the tar in the pores of the catalyst and the contact of the heavy components with active sites are benefited,and the catalyst has a good catalytic effect in the catalytic reforming of coal tar, and has a broad application prospect.

The invention discloses a multistage pore molecular sieve-supported heteropolyacid alkylation desulfurization catalyst and a preparation method thereof. A multistage pore molecular sieve prepared by acid-base compound treatment is taken as a carrier, and with the aid of microwaves, a supported heteropolyacid catalyst is subjected to in-situ synthesis through a hydrothermal dispersion method. A specific synthesis method of the catalyst comprises the following steps: firstly preparing the molecular sieve carrier with multistage pore channels by adopting acid-base hydro-thermal treatment and thenperforming in-situ synthesis on the supported heteropolyacid catalyst by adopting a hydrothermal dispersion method with the aid of the microwaves. Measured by 100 percent by weight of multistage poremolecular sieve, the catalyst comprises 5-40 percent by weight of heteropolyacid; in the multistage pore molecular sieve, the molar ratio of SiO2 to Al2O3 is 10:60; the specific surface area is 200-700 m<2> / g; the pore volume is 0.3-0.8 m<3> / g. The multistage pore molecular sieve-supported heteropolyacid catalyst disclosed by the invention has the characteristics of firm active component supporting and good reusability and has the advantages of high thiophene sulfide conversion rate, good stability and high selectivity and the like when being used in the gasoline sulfide alkylation conversionprocess especially.

The invention discloses a preparation method and application of a nitrogen-containing super-crosslinked polymer derived Co@CN catalyst. The preparation method comprises the following steps: dissolving a benzo nitrogen-containing heterocyclic compound, benzene, dimethoxymethane and anhydrous ferric trichloride in an organic solvent, heating to fully react, and purifying and drying the product to obtain the nitrogen-containing super-crosslinked polymer; then, dispersing the polymer and cobalt salt into deionized water, adding urea, transferring into a reaction kettle, carrying out heat treatment under an overturning condition, cooling, separating, washing, drying and purifying to obtain a precursor; and finally, pyrolyzing the precursor in a nitrogen atmosphere to prepare the nitrogen-containing super-crosslinked polymer derived Co@CN catalyst with high catalytic activity, and applying the Co@CN catalyst to a reaction for catalyzing selective hydrogenation of quinoline compounds to prepare tetrahydroquinoline compounds. According to the method, the yield of the tetrahydroquinoline compound prepared from the quinoline compound is increased, and the reaction temperature is reduced.

The invention relates to preparation of an ionic liquid / benzyl alcohol difunctionalized silica catalytic material and an application of the material to catalysis of a reaction for synthesizing cyclocarbonate from carbon dioxide and epoxide. The ionic liquid / benzyl alcohol difunctionalized silica catalytic material is prepared from a functionalized silica material containing double bonds, an ionicliquid containing double bonds and (4-vinylphenyl)methanol through a free radical polymerization reaction. The raw materials required for preparation of the catalyst are simple and easily available, the preparation process is finished only through the one-step free radical polymerization reaction, the catalyst has high content of functional groups, high specific surface area and high pore volume,diffusion based mass transfer of a substrate and a product is facilitated, the reaction for synthesizing cyclocarbonate from epoxide and carbon dioxide through cycloaddition can be catalyzed efficiently, and substrate universality is realized. The preparation process of the catalyst is simple, economical and environmentally friendly, up-scale synthesis can be realized, and important industrial application prospect is provided.

The invention discloses a fuel cell bipolar plate, which comprises an anode plate, a cathode plate and two cooling plates, wherein the anode plate is sequentially superimposed, covered and connected with one cooling plate from bottom to top, the cathode plate is sequentially superimposed, covered and connected with the other cooling plate from top to bottom, the anode plate and the cathode plate constitute a fuel cell unit with a membrane electrode clamped between the anode plate and the cathode plate, the upper surface of the anode plate is provided with a hydrogen horizontal flow channel, the upper surface of the cathode plate is provided with an air horizontal flow channel, and the upper surface of each cooling plate is provided with a cooling liquid horizontal flow channel; and the anode plate, the cathode plate and the cooling plates are respectively provided with a plurality of hydrogen vertical flow channels, air vertical flow channels and cooling liquid vertical flow channels.The bipolar plate is small in flow resistance and can enable the temperature field inside the cell to be uniform in distribution.

The invention discloses a process method for producing aluminum hydroxide by seed decomposition of supersaturated sodium aluminate solution. Local stirring is carried out at the bottom of a seed decomposition tank with the stirring strength being capable of keeping aluminium hydroxide particles at the bottom of the seed decomposition tank at a suspension state, so that sodium aluminate solution with high solid content and high molecular ratio, at the bottom of the seed decomposition tank, can be diffused and subjected to mass transfer, and the aluminium hydroxide particles at the bottom of the seed decomposition tank can not deposit. The process method disclosed by the invention breaks through a conventional process line requiring full-mixed-flow stirring in the seed decomposition process, provides a new process method including local stirring and plug flow, and has the characteristics of good energy-saving and consumption-reducing effects, high decomposing output rate, good product quality and the like.

A method for preparing sol-gel flow phase of direct methanol fuel cell includes using metal organic compound as presoma and methanol in flow phase as scattering media, adding sulphuric acid and water to form sol by hydrolyzation and poly-condensation reactions, doping hetero-acid and conductive polymer as well as metal powder to form gel flow phase.

The invention provides a spherical activated carbon ozone catalyst with high alkalinity on the surface. The spherical activated carbon ozone catalyst is prepared by the following steps: mixing asphaltof a low softening point and an oxidation accelerator with a Lewis catalyst, adding a surfactant and a water suspension, performing sphere formation, performing carbonization and activation so as toobtain a mesoporous spherical activated carbon catalyst, further adding an alkali liquid, performing sufficient mixing and modification, uniformly mixing the components through gradient temperature change, performing washing till the pH value is stable, performing vacuum drying, so as to obtain mesoporous spherical activated carbon with high alkalinity on the surface. The material is high in catalytic activity, is capable of significantly improving the efficiency of converting ozone into hydroxyl radicals and promoting mineralization of refractory pollutants, is good in stability and can maintain high catalytic activity in long-term use. The catalyst can be applied to treatment on organic pollutants, and is beneficial to adsorption and intragranular diffusion and mass transfer of pollutants, and the degradation efficiency can be improved.

The invention provides a bionic fiber functional material as well as a preparation method and application thereof. The material is rich in multiple adsorption sites (N, O and S); the material is obtained by blending a polyethyleneimine polymer modified by three multifunctional groups, carboxylated nano-cellulose and graphene oxide, performing a coaxial spinning method based on an imitated spider spinning principle, and performing a post-crosslinking technology; the material is of a multi-layer structure with nanocellulose as a framework, graphene oxide as an outer layer and polyethyleneimine polymers modified by three multifunctional groups respectively as an inner layer; and all the layers are connected through chemical bonds. The N, O and S adsorption site densities of the material are all higher than 5 mmol / g.

The invention relates to a device for domesticating and enlarged culture of microorganisms in active sludge type wastewater treatment process, and discloses surface turbine aeration and oxygenation type microorganism domesticating equipment. The surface turbine aeration and oxygenation type microorganism domesticating equipment comprises a tank body (1), wherein the lower side wall of the tank body (1) is connected with a surface turbine aeration machine (4); the upper side wall of the tank body (1) is provided with a nutrient inlet (11) and a microorganism inlet (12); an aeration pipe (3) is arranged in the tank body (1), and is arranged at the lower side of the tank body (1); a control system is arranged at the side wall of the tank body (1), and comprises a water inlet system (13), a drainage system (12), a first liquid level control system (15) and a second liquid level control system (16). The surface turbine aeration and oxygenation type microorganism domesticating equipment has the advantages that the tank body is used for domesticating and multiplying the microorganisms; the domesticated and multiplied microorganisms are sent into sewage by the drainage system; the surface turbine aeration machine is used for quickly thinning the fed microorganisms, and enabling the water flow to rotationally and cyclically flow, so that the oxygen in water is quickly diffused and transferred.

The invention relates to a preparation method of textured high-curie-point Pr2Ti2O7 ceramic. According to the technical scheme, the two-time plasma activation heat treatment technology is adopted. The method specifically includes the first step of primary plasma activation heat treatment and the second step of secondary plasma activation heat treatment. In the first step, a graphene die is filled with Pr2Ti2O7 raw materials and then moved into a plasma activated sintering furnace to be activated for 10-30 s, then the temperature is increased to 1100-1250 DEG C at the temperature rise speed of 50-100 DEG C / min, the temperature is kept for 1-3 min, pressure of 20-50 MPa is exerted, and a Pr2Ti2O7 ceramic block is obtained after dense sintering; in the second step, the Pr2Ti2O7 ceramic block is put into the center of a graphene die of a larger size and then moved into the plasma activated sintering furnace to be activated for 10-30 s, then the temperature is increased to 1200-1350 DEG C at the temperature rise speed of 50-100 DEG C / min, the temperature is kept for 3-5 min, pressure of 40-80 MPa is exerted, and the textured Pr2Ti2O7 ceramic is obtained after texturing. The defects that the existing texturing technology of hot forging, hot pressing and the like is long in thermal processing cycle, high in sintering temperature, low in production efficiency and the like are effectively overcome; the application requirement of the high-temperature piezoelectric field can be met through the prepared Pr2Ti2O7 ceramic.

The invention relates to an organic silicon nano particle modified electrode, a sensor piece and a preparation method of the electrode. The organic silicon nano particle modified electrode is an organic silicon nano particle electrode, wherein organic silicon nano particles are subjected to surface finish sulfydryl or amino functionalization. The organic silicon nano particle modified electrode is characterized in that a silane material containing an organo-functional group is utilized as a silicon source, and uniform superfine organic silicon nano particles are obtained with the existence of a surface active agent with a proper quantity under room temperature; and further, a uniform compact organic silicon nano particle film is formed on the surface of the electrode through using a normal position assembly or condensed method, and therefore, the organic silicon nano particle modified electrode with different functions is obtained. The invention also discloses the sensor piece assembled by adopting the modified electrode, and the sensor piece is used for detecting trace heavy metal. The organic silicon with the single function is adopted as the silicon source in the preparation, and therefore, the functional groups on a nano surface are rich; and as the nano particles are utilized as a sensing interface, the sensitivity response of analytes such as the trace heavy metal (Pb, Hg, Cu and the like) in the sensor is greatly improved.

The invention relates to a preparation method of a compound porous molecular sieve catalyst. According to the preparation method, the problems that the cost is high, the effluent quantity is large and the benefit of environmental protection is not achieved in the prior art are mainly solved. The preparation method comprises the following steps: (a) carrying out sealing aging on a mixture of an M source, a silicon source, a surfactant and a mineralizing agent for 5-200 hours at 20-95 DEG C, so as to obtain a precursor A; (b) carrying out solution-free crystallization on the precursor A, firstly processing the precursor A at 60-140 DEG C for 2-50 hours, and then processing the precursor A at the temperature of 140-250 DEGC and the pressure of 0.3MPa-12MPa for 2-50 hours, so as to obtain a precursor B; and (c) calcining the precursor B at 300-1000 DEG C for 3-10 hours so as to obtain the compound porous molecular sieve catalyst. According to the technical scheme, the problems are well solved. The preparation method can be applied to the industrial production for preparing the compound porous molecular sieve catalyst.

The invention provides tetragonal-phase nano-composite zirconia powder and a preparation method thereof, a sintered body and a preparation method and application of the sintered body. The chemical general formula of the tetragonal-phase nano-composite zirconia powder is ZrEraCebPrcOd, wherein a is more than or equal to 0.005 and less than or equal to 0.1, b is more than or equal to 0.01 and less than or equal to 0.15, c is more than or equal to 0 and less than or equal to 0.08, and d is equal to (4+3a+4b+3c) / 2. The preparation method sequentially comprises the steps of coprecipitation, water washing, drying and roasting, wherein the preparation process is simple, mild, green and environmentally friendly. The preparation method of the sintered body comprises the following steps: preparing tetragonal-phase nano-composite zirconia powder into a pre-sintered body, and sintering the pre-sintered body in a reducing mixed gas containing H2 and N2, wherein in the sintered body, the molar ratio of Ce<3+> to Ce<4+> is (0.05-20):1. According to the invention, the sintered body is high in density and not easy to age at low temperature, the color can be regulated and controlled through a sintering process, and the application range is wide.