151results about How to "Good catalytic" patented technology

The invention discloses a bimetallic composite catalyst of copper and rare earth, a preparation method of the bimetallic composite catalyst and application of the bimetallic composite catalyst in electrochemical reduction of carbon dioxide. The preparation method of the bimetallic composite catalyst comprises the following steps: mixing copper salt and rare earth metal salt in water, adding ammonium carbonate and inorganic alkali into the mixture, stirring and reacting, and centrifuging, washing and drying the mixed solution to obtain a catalyst precursor; calcining the catalyst precursor to obtain the bimetallic composite catalyst, the Cu and rare earth bimetallic compound catalyst has the advantages of high current density, high selectivity, good system stability and long service life when being used for electrically reducing CO2. The catalyst has rich active sites, has a large surface area, can be fully contacted with an electrolyte and CO2, and can overcome the limitation of substance transfer. Selective output of methane or multi-carbon products is efficiently achieved by regulating and controlling the molar ratio of copper to rare earth elements, the partial current density of methane and the multi-carbon products reaches the industrialization level, and the catalytic effect is excellent.

The invention provides a bimetallic-catalyzed magnesium-based hydrogen storage material and a preparation method thereof, and relates to the technical field of hydrogen energy. The magnesium-based hydrogen storage material is a compound mainly formed by magnesium hydride and a catalyst, and the catalyst is a bimetallic catalyst TiO2 / C / Ni formed by loading nickel and titanium dioxide on a carbon substrate; according to the magnesium-based hydrogen storage material MgH2-TiO2 / C / Ni, a bimetallic catalyst TiO2 / C / Ni is introduced into MgH2, trace efficient catalysis of MgH2 is achieved, the hydrogen storage capacity of MgH2 is not excessively lost, meanwhile, the excellent catalytic effect can be achieved, and therefore the prepared magnesium-based hydrogen storage material MgH2-TiO2 / C / Ni shows excellent hydrogen storage performance and hydrogen absorption and desorption cycle stability. The invention also provides a preparation method of the bimetal catalyzed magnesium-based hydrogen storage material, and the preparation method introduces a catalyst into an MgH2 system through a ball milling method to realize stable preparation of the magnesium-based hydrogen storage material.

The invention discloses a high-activity chemical copper plating solution and a chemical copper plating method, and relates to the technical field of chemical copper plating, and the chemical copper plating solution comprises the following components: a copper ion source, a biological enzyme, a natural polymer complexing agent, a pH regulator and a stabilizer; according to the method, the specific bio-enzyme is adopted as the chemical copper plating catalyst, the remarkable catalytic effect is shown, the bio-enzyme has efficient selectivity and catalytic activity, reduction and deposition of copper ions can be accelerated under the mild condition, and therefore reaction energy consumption and equipment requirements are reduced, meanwhile, use of chemical reagents is reduced, and the cost is reduced. In addition, natural polymer complexing agents such as chitosan and sodium alginate have good biocompatibility and degradability and can form a stable complex with copper ions, the stability and the copper plating effect of the plating solution are enhanced, and by designing the natural polymer complexing agent with a specific structure such as a hyperbranched structure, the copper plating effect of the plating solution is improved. And the complexing ability and the performance of the copper plating solution are further improved.

The invention relates to the technical field of catalysts, in particular to a catalyst for fire coal and a preparation process thereof, and the catalyst comprises the following materials in parts by weight: 2-8% of rare earth nitrate, 5-18% of alkaline earth metal salt, 2-5% of alkali metal salt, 0.5-1% of copper-manganese composite oxide, 0.2-1.5% of transition metal salt, 0.1-0.3% of nonionic surfactant, 0.05-0.15% of organosilicon compound and the balance of water. The coal-fired catalyst is specially designed for a power plant, has excellent permeation and adsorption performance, solves the problem that the coal-fired catalyst is difficult to uniformly disperse in blocky coal, promotes full combustion of the coal in the power plant, improves the combustion rate and the burn-off rate, eliminates solid hazardous wastes from the preparation raw materials, ensures safety and environmental protection, and is suitable for industrial production. The power plant can be assisted to save coal resources, emission of harmful pollutants can be reduced from the source, and remarkable economic benefits and environmental benefits are brought to the power plant.

The invention relates to the field of preparation of quantum dot cuprous oxide, in particular to a simple preparation method and application of high-dispersion cuprous oxide quantum dots, and the method comprises the following steps: mechanically grinding commercial P25 serving as a carrier catalyst and copper chloride in an agate mortar, uniformly mixing, adding hydrazine hydrate, continuously grinding for 30 minutes, washing the obtained solid product with deionized water, and drying to obtain the high-dispersion cuprous oxide quantum dots. And drying at room temperature to obtain the cuprous oxide quantum dots uniformly dispersed on the TiO2 carrier. The preparation method of the metal quantum dots is simple and convenient, the raw materials are simple and easy to obtain, repeatability is good, and the metal quantum dots are highly dispersed. The material prepared through the method can remarkably improve the photocatalytic hydrogen evolution and nitrogen reduction efficiency of a carrier catalyst. The method has a wide application value in the creation of the quantum dot catalyst in the field of sustainable energy sources such as photocatalysis.

The invention relates to the technical field of waste plastic treatment, in particular to a waste plastic grading carbonization device and a waste plastic treatment method. The waste plastic grading carbonization device comprises a feeding hopper, a crushing device, a grinding device, a screening device, a catalyst self-adaptive proportioning device, a first spiral discharging machine, a first-stage carbonization chamber, a second-stage carbonization chamber, an activation chamber, a second spiral discharging machine, a solid product collecting device, a liquefaction device, a liquefied product collecting device, a cooling water circulating device and a third spiral discharging machine, a material returning bin and a tail gas treatment device. According to the invention, through the collaborative innovation of'grading carbonization 'and'catalyst self-adaptive proportioning device', the problems of incomplete and non-uniform carbonization of the waste plastics, inadequate utilization of gas products and the like in the pyrolysis process of the waste plastics are solved, and an industrial feasible path is provided for chemical recovery of the waste plastics; the device is reasonable in overall structural design and high in treatment energy efficiency, and continuous, sufficient and efficient pyrolysis and high-value conversion of the waste plastics are achieved.

The invention belongs to the technical field of catalyst preparation, and provides a water-sulfur-resistant monolithic catalyst and a preparation method and application thereof.The preparation method comprises the following steps that a carrier is placed in composite slurry, calcination is conducted after dipping is completed, the carrier containing a protective coating is obtained, and the composite slurry comprises titanium dioxide and a lanthanum nitrate-silica sol compound; s2, putting the carrier containing the protective coating obtained in the step S1 into a non-noble metal additive compound solution, and calcining after dipping to obtain a carrier containing a non-noble metal additive coating; and spraying Pd-coated SiO2 precursor aerosol on the carrier surface of the non-noble metal auxiliary agent coating obtained in the step S2, and calcining to obtain the water-sulfur-resistant monolithic catalyst. According to the preparation method, the catalytic performance and the stability of the catalyst are improved, and the preparation cost is reduced.

The invention discloses a self-supporting carbon electrode based on a wood-bamboo material, a preparation method of the self-supporting carbon electrode and application of the self-supporting carbon electrode in manufacturing of a supercapacitor electrode. The preparation method comprises the following steps: (1) fully carbonizing wood and bamboo chips with through pores in an inert atmosphere to obtain wood and bamboo carbon chips; (2) soaking foamed nickel in a solution containing cobalt acetate and nickel acetate, then taking out and airing, wrapping the wood-bamboo carbon sheet, and extruding the foamed nickel under the pressure of 5-15kN / m < 2 > to enable the foamed nickel to be in full contact with all the surfaces of the wood-bamboo carbon sheet; and (3) fixing the foamed nickel-coated wood-bamboo-carbon sheet obtained in the step (2) on a first conductive support as a working electrode, placing the working electrode, a counter electrode and a reference electrode in a molten salt electrolyte in an inert atmosphere for electrolysis, applying a voltage of-2.1 to-2.3 V to the working electrode, carrying out electrolysis for 8-12 hours to realize pore forming and graphitization, and after the electrolysis is completed, taking out the foamed nickel-coated wood-bamboo-carbon sheet. And taking out the wood-bamboo carbon sheet sample from the foamed nickel, washing and drying to obtain the self-supporting carbon electrode.

The invention discloses a method for preparing 2, 5-furandicarboxylic acid through selective catalytic oxidation of 5-hydroxymethylfurfural by using a nano-microstructured multi-metal oxide, which comprises the following steps: mixing different metal salts and an alkaline additive in a solvent, and preparing 2, 5-furandicarboxylic acid by using the characteristics of excellent dissolving capacity and diffusion performance of the solvent in a subcritical state. According to the method, metal ions are fully contacted and rapidly crystallized in subcritical fluid, the temperature and pressure in the reaction process are regulated and controlled to regulate and control the microstructure of the multi-metal oxide, so that multi-metal active sites are excited, and then roasting is performed to prepare the multi-metal oxide catalyst. And the 5-hydroxymethylfurfural can be efficiently and selectively converted into the 2, 5-furandicarboxylic acid under alkaline and aqueous solution conditions. The catalyst prepared by the method has the advantages of high dispersity, strong controllability and rapid crystallization. Compared with a noble metal catalyst, the multi-metal oxide catalyst prepared by the method disclosed by the invention is relatively low in cost, high in stability, recyclable and wide in application environment.

The invention belongs to the technical field of catalytic materials, and particularly discloses a Fe-Sn-NMC catalyst, a preparation method thereof and application of the Fe-Sn-NMC catalyst to catalysis of B-V reaction, oxygen is used as a green oxidant, aldehydes are used as a co-oxidant, Fe-Sn-NMC is used as the catalyst, and ketones are catalytically oxidized to synthesize esters. A catalyst, ketone and aldehyde are added into a reactor containing a solvent, oxygen is introduced by a bubbling method, heating and stirring are performed, the catalyst is filtered out after the reaction is finished, and the highest ketone conversion rate can reach 98% and the highest yield can reach 98% after gas chromatographic analysis. The Fe-Sn-NMC catalyst prepared by the method is simple to prepare and mild in reaction condition, has the advantages of high activity, high selectivity, good stability and the like, has excellent repeatability, still has good catalytic activity after being circulated for 9 times, and has a good industrial prospect.

The invention provides a preparation method of high-purity lithium difluoro (oxalato) borate, which comprises the following steps: taking a boron trifluoride complex, lithium oxalate and anhydrous oxalic acid as raw materials, simultaneously adding a composite catalyst prepared from polyaluminum chloride and silicon dioxide gel, filtering, concentrating, evaporating and crystallizing, washing and drying to obtain a lithium difluoro (oxalato) borate product. The yield of the lithium difluoro (oxalato) borate obtained by the method can reach 90% or above, and the purity of the lithium difluoro (oxalato) borate can reach 99.65% or above; meanwhile, the composite catalyst disclosed by the invention can be repeatedly utilized, and high-yield and high-purity lithium difluoro (oxalato) borate can also be obtained.

The invention relates to a cement-based material with a photocatalytic function, a coating, a casting body and a preparation method, the cement-based material with the photocatalytic function comprises cement-based dry powder, and the cement-based dry powder comprises, by weight, 1-1.5 parts of molybdenum disulfide nanoflowers and 9-19 parts of Portland cement. The preparation method has the beneficial effects that the molybdenum disulfide nanoflower is directly introduced into a cement-based material as a photocatalyst, so that the self-cleaning function and the dye degradation function of the material are increased, the hydration rate and the mechanical property of the cement are improved, and the cement is a green and sustainable building material. The preparation method of the cement-based material with the photocatalytic function is simple and efficient.

The invention discloses a thioacetamide modified electrolytic manganese residue catalyst as well as a preparation method and application thereof, and belongs to the technical field of organic wastewater treatment. Electrolytic manganese residues are subjected to water washing pretreatment and then mixed with thioacetamide and water for a hydrothermal reaction, the thioacetamide modified electrolytic manganese residue catalyst is obtained, the catalyst has high catalytic activity on persulfate, the degradation efficiency of the persulfate on organic matter can be improved, and the catalytic activity of the thioacetamide modified electrolytic manganese residue catalyst is improved. And the preparation method takes the electrolytic waste residues generated in manganese metal production as the raw material, the cost is low, the steps are simple, only one-step washing and hydro-thermal treatment are needed, and large-scale production is facilitated.

The invention discloses molybdenum cobalt nitride Co3Mo3N and a preparation method thereof, and belongs to the technical field of electrochemical energy. The nano composite material is prepared by taking the nitrogen-containing compound as a nitrogen source and under the protection of nitrogen and other atmospheres in the heat treatment process, so that the synthesis efficiency of the metal nitride is improved, the use of NH3 is avoided, and the preparation process of the material is safer, greener and more efficient. The prepared single-metal nitride or double-metal nitride is used for a positive electrode catalytic material of a lithium carbon dioxide battery and has very good application potential.

The invention discloses a low-rhodium three-way catalytic catalyst for efficiently converting NOx as well as a preparation method and application of the low-rhodium three-way catalytic catalyst. The low-rhodium three-way catalytic catalyst comprises a transition metal modified molecular sieve layer, transition metal adopted in the transition metal modified molecular sieve layer is one or more of Fe, Co, Cu and Mn, and a molecular sieve used for modification is one of an MFI type molecular sieve, a beta type molecular sieve, an SSZ type molecular sieve and an AEI type molecular sieve; the transition metal modified molecular sieve layer is coated below the precious metal Rh coating and the precious metal Pt and Pd coating and is used for improving the NO conversion efficiency of the catalyst and reducing the dosage of the precious metal Rh. According to the catalyst, the transition metal modified molecular sieve is applied to the three-way catalytic catalyst and serves as an independent coating, the NO conversion efficiency of the catalyst is improved under the condition that the O2 content in tail gas is larger than the theoretical air-fuel ratio, the dosage of precious metal rhodium in the catalyst is reduced, the purposes of efficiency improvement and cost reduction are achieved, and the catalyst is particularly suitable for the field of motorcycle tail gas treatment; good economic values and popularization prospects are realized.

The invention discloses a ferrocene cyano porphyrin burning rate catalyst as well as a preparation method and application thereof. The method comprises the following steps: catalyzing 3-ferrocene acetenyl benzaldehyde with dipyrromethane and pyrrole respectively through trifluoroacetic acid and oxidizing 2, 3-dichloro-5, 6-dicyanobenzoquinone to prepare 5, 15-diphenylporphyrin and 5, 10, 15, 20-tetraphenylporphyrin of which benzene ring meta positions are substituted by ferrocene acetylene respectively, and then adding 2, 3-dichloro-5, 6-dicyanobenzoquinone to prepare the ferrocene acetenyl porphyrin and 5, 10, 15, 20-tetraphenylporphyrin of which benzene ring meta positions are substituted by ferrocene acetylene. And reacting the two porphyrins with acetates of zinc, nickel, ketone and cobalt to obtain corresponding metalloporphyrin. The two series of alkynyl-containing porphyrins are respectively subjected to tetracyanoethylene reaction to obtain cyano ferrocene functionalized porphyrin and metalloporphyrin. The ferrocene cyano porphyrin and the metalloporphyrin provided by the invention not only have better catalytic properties on thermal degradation of AP, but also have the advantage of no migration when being used as a burning rate catalyst of a composite solid propellant. Therefore, the cyano ferrocene functionalized porphyrin and metalloporphyrin provided by the invention have better practical prospects in the field of solid rocket propellant burning rate catalysts.

The invention provides a catalyst for preparing an oxygen-containing compound through olefin hydroformylation reaction and a preparation method and application thereof, the catalyst is FexCoyM, the catalyst contains 0.1-15 wt% of M, 85-99.9 wt% of Fe and Co, the atomic number ratio of x to y is 0.1-10, and M is a metal element. When the catalyst is used for preparing an oxygen-containing compound through olefin hydroformylation reaction, the conversion rate of olefin can reach 93-99.9%, and the selectivity of the oxygen-containing compound can reach 89-98.8%; and the catalyst is in a solid state in the reaction process, so that solid-liquid separation between the catalyst and the product is easy, and loss of the catalyst in the separation process is also avoided.

The invention relates to an alkaline system urea oxidation catalyst, which is a Ni-Ni3S2 composite catalyst obtained by adding a sulfur salt into a mixed solution of raw materials of nickel salt, urea and melamine for preparing a nickel-based catalyst, preparing a catalyst precursor by a hydrothermal method, and calcining at a high temperature of 550-650 DEG C in an inert atmosphere. The second element sulfur is introduced into the nickel-based catalyst, the electronic structure of the catalyst is changed, the conductivity of the catalyst is improved, and charge transfer in the catalysis process is promoted, so that the reaction rate is increased, and the catalytic activity of the Ni-Ni3S2 composite catalyst is further improved.

The invention relates to a [Cu6I6] cluster lanthanide series-containing microporous catalytic material and a preparation method and application thereof in catalysis of CO2 carboxylic acid cyclization, the molecular formula of the catalytic material is [Eu2Cu6I6 (pyrc) 4 (DMF) 6], and the ligand pyrc is 4-pyrazole carboxylic acid; the crystal structure of the catalytic material belongs to a triclinic system, the space group is Pi, and the cell parameters are as follows: # imgabs0 # imgabs1 # alpha = 84.072 (4) degrees, beta = 88.384 (3) degrees, gamma = 87.343 (4) degrees and # imgabs2 #. The preparation method comprises the following steps: S1, adding 4-pyrazole carboxylic acid and Eu (NO3) 3.9 H2O into DMF (Dimethyl Formamide), and performing ultrasonic treatment to form a solution A; s2, adding CuI into DMF, and performing ultrasonic treatment to form a turbid liquid B; and S3, mixing A and B, carrying out ultrasonic treatment, transferring into a pressure-resistant bottle, heating to 125 DEG C at a speed of 10 DEG C / min, carrying out heat preservation for 24 hours, carrying out solvothermal reaction, and cooling to room temperature at a speed of 5 DEG C / min to obtain the crystal. The [Cu6I6] cluster lanthanide series microporous material catalyzes CO2 and propargyl alcohol to perform carboxylic acid cyclization at normal temperature and normal pressure to obtain a target product alkylene cyclic carbonate product. The [Cu6I6] cluster lanthanide series microporous catalytic material is used for catalyzing CO2 and propargyl alcohol to carry out carboxylic acid cyclization reaction at normal temperature and normal pressure.

The invention discloses a hollow CeO2 material, a preparation method thereof and a CeO2 modified diaphragm, and the method comprises the following steps: 1, dissolving 10-30 g of polyvinylpyrrolidone in 600-800 mL of an ethanol solution with the volume fraction of 50%, then adding 300-500 mg of CeCl3. 7H2O, after the CeCl3. 7H2O is dissolved, then adding 400-600 mg of Cu2O, and stirring at room temperature to obtain a brick red solution; 2, dissolving 40-50g of sodium thiosulfate in 200mL of deionized water to obtain a sodium thiosulfate solution, dropwise adding the sodium thiosulfate solution into the brick red solution to obtain a faint yellow solution, stirring at room temperature, and sequentially standing, aging, centrifuging, washing and vacuum drying to obtain light yellow hollow CeO2 powder; and 3, placing the CeO2 powder in a muffle furnace, heating from room temperature to 300-400 DEG C at a heating rate of 2 DEG C / min in an air atmosphere, and keeping the temperature for 2-4 hours to obtain the high-crystallinity hollow CeO2 material. The preparation method is simple and efficient, and the obtained hollow CeO2 material can effectively inhibit the shuttle effect of polysulfide.

The application provides a porous recrystallized silicon carbide-based catalytic module and a preparation method and application thereof, and belongs to the technical field of catalytic materials. The porous recrystallized silicon carbide-based catalytic module provided by the application comprises a carrier and an active component loaded on the carrier; the carrier is porous recrystallized silicon carbide; and the active component comprises a metal single active component and / or a metal oxide active component. The porous recrystallized silicon carbide-based catalytic module provided by the application has the carrier of porous recrystallized silicon carbide, high porosity, large specific surface area and excellent corrosion resistance, and has excellent catalytic effect and long service life.

The invention relates to a method for improving the anaerobic fermentation efficiency of organic waste, and belongs to the technical field of waste resource reutilization, and the specific operation is as follows: firstly, crushing and uniformly mixing the organic waste to obtain an anaerobic fermentation substrate, then mixing a white-rot fungus fermentation product, cellulase and an acetic acid-sodium acetate buffer solution to obtain a solution A, and then adding the solution B to obtain a solution C; the organic metal framework material and the solution A are mixed according to the mass ratio of 2: 1 and fully stirred, a compound is obtained, finally, the compound is subjected to vacuum freeze drying treatment, finally, the pretreated organic metal framework material and an anaerobic fermentation substrate are evenly mixed, and anaerobic fermentation is conducted, and the organic metal framework material is one of a UiO-66 series, an MOF-808 series and an MIL-101 series. According to the method for improving the anaerobic fermentation efficiency, an anaerobic fermentation system containing the catalyst is adopted, and when waste resources are recycled through fermentation treatment, PTA-MIL-101-Br contained in the catalyst can effectively improve the fermentation efficiency and the methane output.

The invention provides size-controllable palladium nanoparticles as well as a preparation method and application thereof. The preparation method of the size-controllable palladium nanoparticles comprises the following steps: fully dispersing potassium tetrachloropalladate, tris (4-fluorophenyl) phosphine, 4, 4-dichlorodiphenyl disulfide, sodium salt and a reducing agent in a solvent, reacting, filtering, washing and drying to obtain the size-controllable palladium nanoparticles, the sodium salt is sodium hexafluoroantimonate or sodium tetrafluoroborate. According to the invention, a plurality of palladium nanoparticles with stable ligands (phosphine, mercaptan and anions) are systematically designed and synthesized, the preparation method is simple, and the reaction conditions are easy to realize; by changing the anion ligand SbF6 <-> or BF4 <->, the palladium nanoparticles with different sizes are obtained at a good yield. The palladium nanoparticles are applied to catalysis of the reduction reaction of 4-nitrophenol, and an excellent catalytic effect is shown.

The invention discloses a preparation method of a catalyst. The preparation method comprises the following steps: (1) preparing a guiding agent A; (2) preparing a mixture B; (3) carrying out hydrothermal crystallization on the mixture B; (4) preparing an HY molecular sieve; (5) loading active metal on the HY molecular sieve; and (6) activating with H2 to obtain the catalyst. The invention also discloses application of the catalyst in hydroisomerization conversion of polycyclic aromatic hydrocarbon into alkyl adamantane.

The invention provides a capsule type metal catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: (1) preparing a sodium carboxymethyl cellulose aqueous solution with a certain concentration, adding an additive and a metal salt solution, and uniformly dispersing to obtain a mixed solution A; (2) preparing a gelatin aqueous solution with a certain concentration, then uniformly mixing the gelatin aqueous solution with the mixed solution A, adjusting the pH value of the solution to be acidic, and continuing the reaction to obtain a mixed solution B; (3) placing the obtained mixed solution B in an ice-water bath, and adding a curing agent to carry out a cross-linking curing reaction to obtain a material C; and (4) washing and drying the material C to obtain the capsule type metal catalyst. The capsule type metal catalyst prepared by the invention is applied to hydrosilylation reaction, and can realize high reactant conversion rate and high target product selectivity under mild reaction conditions.

The invention provides a FeCe / SiO2 composite aerogel catalytic material as well as a preparation method and application thereof, and belongs to the technical field of flue gas denitration catalytic materials. According to the FeCe / SiO2 composite aerogel catalytic material, SiO2 aerogel is used as a carrier, and a transition metal oxide is loaded on the carrier; the transition metal oxide is an oxide of Fe and an oxide of Ce. The preparation method comprises the following steps: dissolving cerium salt and iron salt in water, then adding SiO2 aerogel, uniformly mixing, and carrying out microwave hydrothermal synthesis reaction on the obtained mixed solution to obtain a precursor material; and roasting the precursor material to obtain the FeCe / SiO2 composite aerogel catalytic material. The FeCe / SiO2 composite aerogel catalytic material provided by the invention has the characteristics of uniform pore size distribution, high specific surface area, large pore volume and strong adsorption capacity, and can efficiently catalyze NO and CO to be converted into N2 and CO2.

The invention relates to the field of ceramic silicone rubber, and in particular to a flame retardant and ultra-high temperature resistant ceramic silicone rubber material and a preparation method thereof. The ceramic silicone rubber material comprises the following raw materials in parts by weight: 40-70 parts of silicone oil, 10-15 parts of reinforcing fillers, 40-50 parts of ceramic fillers, 15-25 parts of composite additives, 10-20 parts of structure control agents, and 0.15-0.4 parts of inhibitors. By adding the composite additives, the problem that the flame retardant and high temperature resistance of the existing ceramic silicone rubber material decrease due to the addition of flux is solved, and the impact resistance of the ceramic silicone rubber material after ceramicization is improved, so that the ceramic silicone rubber material can still maintain a certain working ability when a fire occurs.

This invention provides a fluorine-doped ZnIn2S4 photocatalyst, its preparation method, and its application. The fluorine-doped ZnIn2S4 photocatalyst has a spherical nanoflower structure, which is composed of nanosheets arranged in an array. The preparation method includes the following steps: (1) adding ZnCl2, InCl3·4H2O, and thioacetamide to water and stirring to obtain a mixture A; (2) adding a fluorine source to mixture A and mixing thoroughly to obtain mixture B; (3) subjecting mixture B to a hydrothermal reaction, separating the product after the reaction, washing, and drying to obtain the F-ZnIn2S4 photocatalyst. The fluorine-doped ZnIn2S4 photocatalyst exhibits highly efficient photocatalytic activity.

The invention relates to the technical field of selective hydrogenation of olefin gas, and further relates to a composite carrier, a catalyst, a preparation method of the catalyst and a method for removing alkyne through front hydrogenation of C2 fraction. The preparation method of the composite carrier comprises the following steps: mixing raw materials including a raw material A, an auxiliary agent B, an auxiliary agent C and a solvent D, molding, granulating and roasting to obtain the composite carrier, the raw material A is nano diamond; the auxiliary agent B is a colloidal high-molecular polymer; the auxiliary C is at least one of graphite, polyvinyl alcohol and carboxymethyl cellulose. The catalyst disclosed by the invention is granular, has relatively high strength, can be directly used in acetylene front-hydrogenation reaction industrial application, and improves the ethylene selectivity on the basis of high acetylene conversion rate. Moreover, compared with a carbon-based catalyst reported in documents, the reaction temperature required by acetylene conversion in the invention is lower.

The invention belongs to the field of biomass fuel precursor synthesis, and particularly relates to a modified thin-layer hydrotalcite catalyst, preparation thereof and application of the modified thin-layer hydrotalcite catalyst in biomass fuel precursor synthesis. The preparation method comprises the following steps: dissolving metal salts of Mg, Al and Hf in deionized water to obtain a metal salt solution A; preparing an alkaline solution B; adding the solution A and the solution B into deionized water, and keeping the pH value of the system at 8-10 in the mixing process; and after mixing, carrying out high-temperature aging, washing the precipitate, and drying to obtain the modified thin-layer hydrotalcite catalyst. Through reasonable design of the components and the proportion of the thin-layer hydrotalcite, the composite material is obtained through a simple and feasible preparation method, the industrial cost is low, and large-scale production is easier. Due to modification of hafnium, hydrotalcite has a thinner layered structure and more defect sites, shows more excellent catalytic performance and shows an excellent catalytic effect on various ketones and furfural under mild conditions.