1297 results about "Hydrotalcite" patented technology

The invention provides an acetylacetone-based composite thermal stabilizer which is a mixture obtained by mixing zinc acetylacetonate, calcium acetylacetonate or magnesium acetylacetonate and hydrotalcite pro rata. The composite thermal stabilizer is suitable for chloride-containing high polymer, such as polyvinyl chloride, chlorinated polyethylene, chlorinated polyvinyl chloride, copolymer of vinyl chloride-ethylene or copolymer of vinyl chloride-vinyl acetate, has better thermal stability, prolongs the thermal aging time of the chloride-containing high polymer, and overcomes the shortcomings of poor long-term performance of single stabilizer of zinc acetylacetonate, poor transparency of stabilizer of calcium acetylacetonate, and poor initial colorability of stabilizer of hydrotalcite. The composite thermal stabilizer has low cost, good initial colorability, excellent long-term performance and good transparency, and is an efficient composite thermal stabilizer.

The invention discloses an environment-friendly calcium-zinc composite heat stabilizer and a preparation method thereof, and relates to the technical field of heat stabilizers. The environment-friendly calcium-zinc composite heat stabilizer is prepared from the following raw materials in parts by mass: 10-20 parts of zinc stearate, 20-30 parts of calcium stearate, 10-15 parts of an auxiliary stabilizer, 5-8 parts of a plasticizer, 1-5 parts of an antioxidant and 2-5 parts of filler, wherein the auxiliary stabilizer is a mixture of beta-diketone, modified organic acid intercalated hydrotalcite and modified silicon dioxide; the modified organic acid intercalated hydrotalcite is obtained by splitting expanded vermiculite, adding zinc and lanthanum compounds, coprecipitating with organic acid, and adding a modifier; the modified silicon dioxide is obtained by adding a coupling agent into a solid substance obtained by splitting expanded vermiculite for modification and carrying out a series of chemical reactions with maleic anhydride and pentaerythritol. PVC plastic prepared by adding the calcium-zinc composite stabilizer into PVC paste resin and resin powder has good thermal stability.

The invention provides a concrete admixture with sulfate corrosion resistance and rust resistance functions. The concrete admixture is prepared from the following raw materials in parts by weight: 50-65 parts of fly ash, 8-12 parts of barium carbonate, 8-12 parts of barium hydroxide, 8-12 parts of mineral powder, 5-8 parts of modified hydrotalcite or hydrotalcite, 1-3 parts of nano silicon dioxide and 1-3 parts of calcium nitrite. Nano silicon dioxide is adopted as a compact component, the porosity of the material is reduced, the compactness of concrete is improved, sulfate in the environment is inhibited from being transmitted into the concrete, meanwhile, hydrotalcite is modified by polymaleic acid serving as a scale inhibition component, and the scale inhibition effect is improved through the dual effects of high adsorbability and slow release of the scale inhibition component of hydrotalcite. The preparation method has the advantages that generation of ettringite and gypsum in a sulfate radical environment is inhibited, calcium nitrite is added as a corrosion-inhibiting component, a protective film is formed on the surface of a reinforcing steel bar, the corrosion phenomenon of the reinforcing steel bar in a concrete structure is inhibited, and finally, the concrete admixture with sulfate corrosion resistance and corrosion-inhibiting functions is formed through compounding.

The invention relates to the technical field of soil regeneration, in particular to a method for degrading cadmium-polluted soil based on a heavy metal passivator, which comprises the following steps: S1, preparing PB-MgAl-LDH; s2, carrying out magnetic modification on the PB-MgAl-LDH; s3, preparing a passivating agent; and S4, soil remediation. Solid powder with a good specific surface area and adsorption activity is prepared through steady-state coprecipitation of pine barks and magnesium-aluminum hydrotalcite at a preferable specific growth position, a unique interlayer structure after magnetic modification has magnetism, negative charges are easily generated, adsorption of cadmium is accelerated for balancing the charges, and the adsorption efficiency of cadmium is improved. Meanwhile, lattice diffusion, isomorphous replacement and the like occur, so that the cadmium ion adsorbent shows relatively high ion exchange capacity and adsorption capacity to cadmium ions.

The invention relates to the technical field of formaldehyde adsorption, in particular to a preparation method of modified activated carbon for removing formaldehyde, which comprises the following steps: S1, performing acidification pretreatment on coconut shell charcoal, and grafting the pretreated coconut shell charcoal with polyethyleneimine to obtain activated carbon loaded with polyethyleneimine; s2, carrying out dipping treatment and cyclohexanol treatment on the activated carbon loaded with polyethyleneimine to obtain functionalized activated carbon; s3, reacting the magnesium-aluminum hydrotalcite with a quaternary ammonium salt solution and a sodium benzenesulfonate solution to obtain modified hydrotalcite; reacting the modified hydrotalcite with a vinyl silane coupling agent to obtain vinyl hydrotalcite; s4, the vinyl hydrotalcite and 4-amino-3-hydrazino-5-sulfydryl-triazole are subjected to a reaction, and secondary modified hydrotalcite is obtained; and S5, dispersing the secondary modified hydrotalcite and the functionalized activated carbon in water, and adding glutaraldehyde to obtain the modified activated carbon. The modified activated carbon prepared by the preparation method disclosed by the invention realizes selective recognition, efficient adsorption and catalytic degradation of formaldehyde.

Disclosed in the present application are a catalyst and anode for electrolytic production of hydrogen, and preparation methods therefor, activation methods therefor and the use thereof. In one embodiment, the anode for electrolytic production of hydrogen comprises a catalyst, wherein the catalyst is nickel-iron-barium hydrotalcite and has a hexagonal nanoflake structure, the thickness thereof being 100-200 nm. The catalyst can be prepared by means of a one-step solvothermal reaction method. In the present application, alkaline earth metal ions are uniformly doped in nickel-iron hydrotalcite and are dispersed at an atomic level, such that when the anode for electrolytic production of hydrogen based on the catalyst is applied to a process for electrolytic production of hydrogen from an aqueous solution containing chloride ions, the anode not only retains good catalytic performance, but also has greatly improved resistance to chloride ion corrosion, significantly improved working stability and a significantly prolonged service life.

The invention relates to the technical field of heavy metal wastewater treatment, and discloses a preparation method of porous calcium-aluminum hydrotalcite and application of the porous calcium-aluminum hydrotalcite in wastewater lead removal. According to the specific scheme, an ionic liquid aqueous solution is used as a reaction solvent and a template agent, aluminum, calcium and sodium compounds are used as solutes, the porous aluminum-calcium hydrotalcite with uniform pore diameter and high adsorption capacity is synthesized, and the lead removal rate of the porous calcium-aluminum hydrotalcite can reach 98% or above. Compared with a traditional mode, the adopted preparation method is higher in efficiency, industrialization development of the porous material is facilitated, and a more excellent material can be provided for heavy metal removal.

This invention discloses a method for preparing a CuZnAlGa-based layered double hydroxide (TLH)-derived catalyst for methanol production from carbon dioxide-rich syngas. Using Cu, Zn, Al, and Ga metal salts as precursors, Na₂CO₃ and NaOH as precipitants, and a mixed alcohol-water solution as an auxiliary solvent, co-precipitation is performed under controlled temperature and pH to obtain a LDH-like catalyst precursor. After high-temperature calcination and in-situ reduction in a hydrogen atmosphere, a layered framework structure of Cu nanoparticles immobilized by oxides is obtained. The LDH-like structure provides lattice confinement, preventing Cu particle aggregation, and the interaction between Cu and the oxides enhances the catalyst surface's adsorption capacity for CO and CO₂, thereby improving the activity and stability of methanol production from carbon dioxide-rich syngas.

The invention relates to the technical field of asphalt concrete, and discloses an anti-crack asphalt concrete material and a preparation method thereof. According to the asphalt concrete material disclosed by the invention, by adding the reinforcing filler and the composite aerogel, the crack resistance, the service life and the ultraviolet aging resistance of a matrix are remarkably improved; wherein the reinforcing filler is based on the synergistic effect among modified lignin, diatomite and hydrotalcite, the compatibility among modified lignin, diatomite and hydrotalcite is improved by utilizing a silane coupling agent, and the dispersity of the reinforcing filler in a matrix is improved, so that the crack resistance of the matrix is improved, the service life of the matrix is prolonged, and the ultraviolet resistance of the matrix is improved; the composite aerogel has excellent heat insulation performance and a three-dimensional network structure, and the crack resistance of the matrix can be improved through the synergistic effect.

The invention provides a low-shrinkage copper slag-based cementing material and a preparation method thereof, and relates to the field of solid waste utilization. The low-shrinkage copper slag-based cementing material is prepared from copper slag, slag, fly ash, standard sand, water, a water glass exciting agent, sodium hydroxide, a magnesium oxide expanding agent, a water reducing agent and magnesium-aluminum hydrotalcite. According to the invention, the defects in the prior art are overcome, the problem of environmental pollution caused by solid waste stockpiling can be solved by taking the copper slag and the fly ash as siliceous materials and the slag as a calcium-silicon raw material, and the method has important environmental protection significance for the society. The resource utilization of various solid wastes is realized, and the sustainable development of resources is promoted. The prepared cementing material has good physical and mechanical properties and durability, and the product performance meets the national standard requirement.

The invention relates to the technical field of catalyst materials, and particularly discloses a high-stability hydrogenation catalyst and a preparation method thereof. The invention relates to a preparation method of a high-stability hydrogenation catalyst, which comprises the following steps: preparing a hollow porous microsphere as an inner core from amino-terminated hyperbranched polyaryletherketone and polyvinyl alcohol, and then coating the porous microsphere with a mesoporous silicon dioxide intermediate layer by a sol-gel method; and finally, forming an Mg-Al hydrotalcite layer on the outermost side through a coprecipitation method, dipping and modifying with La (NO3) 3 and Ce (NO3) 3 solutions to obtain a catalyst carrier, dipping the catalyst carrier in an active metal dipping solution, and drying to obtain the catalyst. The high-stability hydrogenation catalyst provided by the invention has excellent mechanical properties and more reaction active sites, has high catalytic activity and catalytic efficiency, and is relatively long in catalytic life.

The invention relates to the technical field of sealing strips, in particular to an anti-aging ethylene propylene diene monomer rubber sealing strip and a preparation method thereof. Comprising the following components in parts by weight: 150-180 parts of ethylene propylene diene monomer, 60-90 parts of carbon black, 8-12 parts of white carbon black, 3-8 parts of a peroxide vulcanizing agent, 6-12 parts of zinc oxide, 12-16 parts of magnesium-aluminum hydrotalcite, 10-18 parts of a plasticizer, 1-3 parts of a crosslinking aid, 1-3 parts of calcium stearate, 1-3 parts of an anti-aging agent and 1-3 parts of a silane coupling agent. The anti-aging agent is a mixture of an anti-aging agent AN245 and an anti-aging agent MBZ. By adding the anti-aging agent, the aging resistance of the ethylene propylene diene monomer can be remarkably improved by inhibiting oxidation and delaying the aging process, a high-crosslinking-density three-dimensional network is formed through the peroxide vulcanizing agent, breakage of molecular chains at high temperature is reduced, thermal aging is delayed, and the ethylene propylene diene monomer sealing strip with excellent aging resistance is prepared.

The invention relates to the technical field of catalysts, in particular to a dehydrogenation catalyst precursor, a dehydrogenation catalyst and a preparation method and application of the dehydrogenation catalyst precursor. According to the dehydrogenation catalyst precursor, a sulfur-modified magnesium-aluminum mixed oxide is used as a carrier, and a Pt metal cluster is used as an active center; wherein the carrier is a mixed-state metal oxide with a layered hydrotalcite structure, a spinel structure and a near-crystalline synergistic structure. A magnesium-aluminum mixed oxide can be prepared by introducing a precursor of alkali metal magnesium into an aluminum oxide precursor, a layered structure or a spinel structure similar to hydrotalcite can be formed by regulating and controlling the calcination temperature, and by combining carrier surface regulation and control modification, the capability of regulating and controlling the interaction between metal and a carrier can be improved, and the performance of the catalyst is improved. Therefore, the active center of the cluster is maintained, and the acid-base property of the surface of the carrier is effectively modulated, so that carbon deposit is reduced, and the activity and stability of the catalyst are improved.

Clean version of Abstract A catalyst and anode for hydrogen production by electrolysis as well as a preparation method, activation method and use thereof are provided. The anode for hydrogen production by electrolysis includes a catalyst which is nickel iron barium hydrotalcite with a nano hexagonal sheet structure and a thickness of 100-200 nm. The catalyst can be prepared by a one-step solvothermal reaction method. Alkaline-earth metal ions are evenly doped in the nickel iron barium hydrotalcite and are in atomic level dispersion, so that the anode for hydrogen production by electrolysis based on the catalyst, when being applied to a process for hydrogen production by electrolysis of an aqueous solution containing chlorine ions, not only can maintain good catalytic performance, but also has greatly improved chlorine ion corrosion resistance, leading to significant improvement of working stability and service life.

The invention discloses a selective desiliconization method for alkaline vanadium liquid. According to the process, magnesium-aluminum hydrotalcite prepared in advance is introduced into the alkaline vanadium liquid, the pH does not need to be regulated and controlled, silicon can be selectively adsorbed, desilicication slag is desorbed and then recycled as a desilicication agent, and a sodium silicate-containing solution can be used for preparing a water glass product. According to the method for deeply adsorbing silicon in the alkaline vanadium liquid by adopting the magnesium-aluminum hydrotalcite, various conditions of an existing process are not greatly changed, disturbance to existing industrial production is small, meanwhile, the problems that the desilicication limit of the alkaline vanadium liquid is insufficient and vanadium loss is high at present can be solved, silicon in the alkaline vanadium liquid can be reduced to 30 mg / L or below, and the requirements of vanadium products are met.

The invention relates to a spherical hydrotalcite phase desulfurization adsorbent as well as a preparation method and application thereof, the preparation method comprises the following steps: mixing an iron source, a nickel source and organic carboxylate, and then carrying out hydrothermal carbonization reaction to obtain the spherical hydrotalcite phase desulfurization adsorbent. The nickel source and the iron source are selected as the raw materials, hydroxide radicals of laminates and carbonate ions between the laminates of the prepared hydrotalcite phase desulfurization adsorbent can increase the alkalinity of the surface of the desulfurization adsorbent and improve the adsorption capacity to hydrogen sulfide, and meanwhile, the hydrotalcite phase desulfurization adsorbent can react with hydrogen sulfide in a catalytic oxidation manner, so that the removal efficiency is improved. Organic carboxylate is selected as a hydrothermal auxiliary agent, carboxylate radicals can chelate metal ions through multidentate coordination to form a stable complex, so that the nucleation rate of hydrotalcite is delayed, the particle size uniformity is improved, meanwhile, a carbon coating layer is generated through hydrothermal carbonization, and pores in the carbon coating layer and pores in hydrotalcite can form hierarchical pore channels, so that the composite material is prepared. The mass transfer efficiency is synergistically improved, so that the adsorption capacity of the adsorbent is improved.

The invention relates to the technical field of water treatment, in particular to a composite flocculant for tunnel construction wastewater treatment and a preparation method thereof. The method comprises the following steps: carrying out a reaction on triethanolamine and isocyano ethyl methacrylate to prepare tertiary amine acrylate; reacting tertiary amine acrylate with methoxyl-polyethylene glycol-chlorine to prepare polyethylene glycol modified quaternary ammonium salt acrylate; further reacting with methyl dichlorosilane to prepare a modifier; and compounding the modifier with hydrotalcite, sodium silicate and an iron-magnesium-calcium mixed solution to prepare the composite flocculant. The flocculant realizes efficient flocculation and pH regulation through mechanisms such as electric neutralization and adsorption bridging, has the characteristics of quickly gathering suspended particles, reducing sludge yield and improving floc compactness and dehydration performance, is suitable for treatment of high-concentration suspended solids and slightly alkaline wastewater, shows comprehensive advantages of high efficiency, economy and environmental protection, and has wide application prospects. The field treatment requirements of tunnel construction wastewater are met.

The invention discloses an HPVC power cable protection pipe and a preparation method thereof, and relates to the technical field of cable protection pipes. The HPVC power cable protection tube is at least prepared from the following raw materials in parts by weight: 100 parts of high-strength polyvinyl chloride, 35 to 45 parts of epoxy acrylate rubber, 5 to 8 parts of vinyl chloride-g-acrylate copolymer, 8 to 12 parts of epoxidized soybean oil, 3 to 5 parts of calcium-zinc composite stabilizer, 5 to 15 parts of modified hydrotalcite, 0.1 to 0.5 part of beta-diketone, 0.8 to 1.5 parts of calcium stearate and 10 to 20 parts of flame retardant. 12 to 15 parts of modified nano calcium carbonate, 5 to 8 parts of talcum powder, 0.6 to 1.2 parts of antioxidant, 1 to 2 parts of anti-aging agent 4010 and 0.5 to 1.5 parts of ultraviolet light absorber UV531; the modified hydrotalcite is obtained by adding a mixed solution of calcium nitrate and lanthanum nitrate, a sodium hydroxide solution and a sodium bicarbonate solution into a lauryl sodium sulfate solution, mixing and aging, and then carrying out a post-treatment process. The HPVC power cable protection tube prepared by the invention has relatively high strength, good mechanical properties, weather resistance and cold resistance, and long service life.

The invention discloses a Ni-based bimetallic multifunctional catalyst and a preparation method and application thereof, and belongs to the technical field of catalysis. The general formula of the Ni-based bimetallic multifunctional catalyst is Ni-M-Al2O3, M in the formula represents one or three of Cr, Mn, Fe, Co or Cu, and the preparation method of the Ni-based bimetallic multifunctional catalyst comprises the following steps: firstly synthesizing a Ni-M-Al hydrotalcite precursor oxide with a layered porous structure, and then preparing the Ni-M bimetallic multifunctional catalyst through an efficient in-situ desolvation method. According to the method disclosed by the invention, the multi-functionality and multi-center concerted catalysis of the catalyst, including an alkaline site, an acid site and a bimetallic hydrogenation active site, is fully utilized, and the target product dimethyl succinate is prepared with high selectivity under a mild condition through the concerted catalysis of bimetallic alkali sites and the interaction of strong metal carriers.

The invention relates to the technical field of water and soil remediation, in particular to magnesium-based hydrotalcite for treating multi-metal co-pollution as well as preparation and application of the magnesium-based hydrotalcite. The magnesium-based hydrotalcite laminate is customized by regulating and controlling trivalent metal elements and object interlayer anions of the magnesium-based hydrotalcite host laminate, the trivalent metal elements are one of Al (III), Fe (III) and the like, and the object interlayer anions are one of CO3 < 2->, NO3 <-> and the like. Preferably, the magnesium-based hydrotalcite is MgAl-CO3, MgAl-NO3, MgFe-CO3 or MgFe-NO3, and the magnesium-based hydrotalcite is a magnesium-based hydrotalcite or magnesium-based hydrotalcite. The LDHs-based material can mineralize heavy metal ions in an ultra-stable manner, and is suitable for rapidly, efficiently, stably and simultaneously removing various heavy metals, and mineralized products have extremely low Ksp (about 10-50), so that secondary pollution caused by secondary dissolution of the heavy metals is avoided.

The invention discloses a high-entropy hydrotalcite nanosheet as well as a preparation method and application thereof. Metal in a laminate of the high-entropy hydrotalcite nanosheet comprises Cu, Mn, Co, Ni and Fe, and all the metal exist in the form of ions. The surface of the laminate has positive charges, and the interlayer of the laminate has negative charges; and the size of the hydrotalcite nanosheet is 30 + / -10nm. When the high-entropy hydrotalcite nanosheet is used as a sound-sensitive agent, the high-entropy hydrotalcite nanosheet has nuclear magnetic imaging performance, can generate a large number of active oxygen species in a tumor microenvironment after ultrasonic treatment, and shows an excellent sonodynamic therapy effect. In addition, manganese ions in the hydrotalcite nanosheet can effectively improve the nuclear magnetic imaging effect, and the biocompatibility is good.

The invention provides a slow-release corrosion-resistant microcapsule applied to reinforced concrete, the slow-release corrosion-resistant microcapsule comprises a capsule core and a capsule wall, and the capsule core comprises a composite corrosion inhibitor, self-repairing microspheres, nano hydrotalcite and an anti-freezing agent; the capsule wall comprises a three-layer structure including an inner layer film, a middle layer film and an outer layer film. The mass ratio of the capsule core to the capsule wall is 1: (0.3-0.5); and the thickness of the capsule wall is 10-17 microns. A pH triggering inner layer, a dynamic self-repairing middle layer and a hydrophobic protection outer layer are designed through three layers of intelligent response capsule walls, and on-demand release and long-term stability of a corrosion inhibitor are achieved; the crack repairing efficiency is remarkably improved through the synergistic effect of the chemical repairing material and the biological spores in the capsule core; the dynamic cross-linked network endows the capsule wall with self-healing ability, resists physical damage, improves the durability of the concrete, prolongs the service life of the concrete, also can enhance the wear resistance of the concrete, and reduces the wear in the use process.

The invention discloses carbon-based material loaded hydrotalcite synergistically modified composite rubber asphalt which comprises the following components in percentage by mass: asphalt, rubber powder, a dispersing agent, a retarder, carbon-based material loaded hydrotalcite, an antioxidant and a heat stabilizer. The carbon-based material loaded hydrotalcite, the antioxidant and the heat stabilizer are compounded, so that the ultraviolet aging resistance, the oxidation aging resistance and the mechanical strength of the composite rubber asphalt can be remarkably improved, the limitation of a single modified material is effectively overcome, and the service life of an asphalt road is greatly prolonged.

The invention relates to the field of flame retardants, in particular to a flame retardant synergist and a preparation method thereof. The flame-retardant synergist is prepared from the following raw materials in parts by mass: 20 to 30 parts of hydrotalcite, 5 to 15 parts of sepiolite and 0.5 to 1 part of phytic acid. The preparation method comprises the following steps: 1, mixing phytic acid with water to prepare a phytic acid solution for later use; step 2, hydrotalcite and a phytic acid solution are mixed under the condition of 200-300 r / min; 3, carrying out solid-liquid separation, wherein the solid part is a first product; step 4, mixing the first product, sepiolite and water under the condition of 2500 to 3000r / min; and step 5, carrying out solid-liquid separation, wherein the solid part is the flame-retardant synergist. The environment-friendly flame-retardant synergist provided by the invention is applied to plastics, can effectively improve the mechanical properties of plastic products, and shows excellent flame-retardant and smoke-suppressing effects.

The present invention discloses a bromine-based flame-retardant reinforced nylon material and a preparation method thereof, and belongs to the technical field of engineering plastics. The bromine-based flame-retardant reinforced nylon material of the present invention is compounded with specific zirconium hydroxide and hydrotalcite to solve the problem of acidic corrosive gas from both physical and chemical aspects, improve the stability of the bromine-based flame-retardant nylon resin system, and enable the product to have good high temperature aging resistance. The present invention also discloses a preparation method of the product and its application in the preparation of electronic and electrical products.

The present invention relates to a polymer powder for the manufacture of articles by 3D printing, in particular by sintering, comprising a thermoplastic polymer, antioxidants, and a particular metal oxide, metal hydroxide and / or hydrotalcite, having improved thermal stability, improved recyclability and improved consistency of mechanical properties of the sintered parts.The invention also relates to a process for preparing this powder and to the use thereof in a process for manufacturing by sintering, and to the articles manufactured from said powder.

The invention belongs to the technical field of biomedical nano material preparation, and provides defect-rich cobalt-zinc-tungsten hydrotalcite as well as a preparation method and application thereof. According to the preparation method disclosed by the invention, based on the controllability and defect engineering of two-dimensional layered double hydroxides (LDHs) main body laminate metal elements and interlayer anions, W < 6 + > / W < 5 + > and Co < 3 + > / Co < 2 + > conversion systems are introduced by regulating and controlling the influence rule of laminate metal composition, arrangement, density, orientation and etching conditions on the photodynamic activity of the LDHs; and when the defect-rich cobalt-zinc-tungsten hydrotalcite is used as the photosensitizer, the ROS yield is high. Through biological effect and metabolic behavior research, the defect-rich cobalt-zinc-tungsten hydrotalcite with good biocompatibility and excellent performance is selected, and a theoretical basis is provided for application of the defect-rich cobalt-zinc-tungsten hydrotalcite to treatment of HCM.

The present invention discloses a Pt-based catalyst and its preparation method and application, belonging to the technical field of dehydrogenation catalysts. The preparation method of the Pt-based catalyst comprises the following steps: mixing an aqueous solution I containing magnesium ions, aluminum ions and platinum ions with an aqueous solution II containing a hydroxide-containing alkaline compound and a carbonate, and reacting to obtain a Pt-based catalyst. The preparation method of the present invention utilizes PtCl6 2‑ The strong electrostatic interaction with the magnesium-aluminum hydrotalcite layer (positively charged) and the change of Pt loading amount realize the microstructural regulation of Pt in the Pt-based catalyst. The Pt-based catalyst prepared by this method has a small Pt particle size, a highly dispersed state, and a high atomic utilization rate. When it is used for the dehydrogenation reaction of methylcyclohexane, compared with the catalyst prepared by the traditional impregnation method, under the same reaction conditions, the methylcyclohexane conversion rate is increased by 3.3 times, and it also has good stability.

The invention discloses a hydrotalcite precursor calcium-based material as well as a preparation method and application thereof. The method comprises the following steps: taking calcium hydroxide and aluminum hydroxide as a calcium source and an aluminum source, and performing constant-temperature water bath and phase transformation in an alkaline environment created by sodium carbonate to obtain a hydrotalcite precursor material with a layered double hydroxide structure; the preparation method comprises the following steps: performing high-temperature calcination on a hydrotalcite precursor, performing phase transformation on the hydrotalcite precursor to form a composite structure containing active CaO and a mayenite skeleton phase, and introducing oxygen vacancies into the material to improve the COadsorption capacity and cycling stability to obtain the calcium-based material based on hydrotalcite phase transformation modification. The problems of high-temperature sintering and agglomeration of the calcium carbonate calcium-based heat storage material in multiple heat charging and discharging processes can be solved, and the service life of the material is prolonged. Meanwhile, oxygen deficiency is introduced into the material in the phase transformation process, the reaction cycle stability and the thermochemical heat storage efficiency are improved, and the material is suitable for the field of medium-high temperature thermochemical industrial energy storage.

The invention discloses a porous CoFe hydrotalcite nano material as well as a preparation method and application thereof, and relates to the field of nano materials. The porous CoFe hydrotalcite nano-material is of a porous layered double hydroxide nano-structure, and the aperture of the porous CoFe hydrotalcite nano-material ranges from 2 nm to 10 nm. The porous CoFe hydrotalcite nano material is prepared through a microwave hydrothermal synthesis method, the preparation method is simple, easy to operate and environmentally friendly, and industrial production can be achieved. The porous CoFe hydrotalcite nano material prepared by the method is stable in structure, has photocatalytic activity and peroxidase-like activity, can effectively catalyze and generate various reactive oxygen free radicals under the illumination condition, realizes efficient synergistic killing of bacteria, and has a good antibacterial effect.