49results about How to "Achieve a high degree of dispersion" patented technology

The invention relates to a boron nitride composite mesoporous oxide nickel-based catalyst and a preparation method thereof. The nano-boron nitride as the carrier having high thermal stability and carbon deposition resistance is combined with active metal anchoring and dispersion based on mesoporous oxides so that the catalytic material having high resistance to sintering and carbon deposition is obtained. The preparation method comprises adding a surfactant and ammonia water into high thermal stability boron nitride and nickel precursors as reactants, carrying out ultrasonic agitation, loading active metal components to the boron nitride nanosheet layer, and carrying out in-situ coating on the surface with an oxide having a mesoporous channel structure. The coated mesoporous structure can realize high dispersion of the active nickel component. Through drying, high temperature calcination and programmed heating reduction, the nickel-based catalyst having high performances and a novel structure is prepared. The boron nitride composite mesoporous oxide nickel-based catalyst has the advantages of simple process, low production cost, no environment pollution and high catalytic efficiency.

The invention discloses a solid basic catalyst, a preparation method of the solid basic catalyst and an application of the solid basic catalyst in ester exchange reaction. The solid basic catalyst catalyzes the ester exchange reaction by the reaction of metal organic compound and hydroxyl on a carrier under the moderate conditions to synthesize dimethyl carbonate. The solid basic catalyst provided by the invention consists of metal organic alkali and the carrier. The metal organic alkali is linked to the carrier in bond-forming manner; the metal organic alkali is one or more of lithium methoxide, lithium ethoxide, lithium isopropoxide, lithium n-butoxide, lithium tert-butoxide, sodium methoxide, sodium ethoxide, sodium isopropoxide, sodium n-butoxide, sodium tert-butoxide, potassium methoxide, potassium ethoxide, potassium isopropoxide, potassium n-butoxide and potassium tert-butoxide; the carrier is one or more of silicon oxide, aluminium oxide, titanium oxide, zirconia, mesoporous silicon oxide synthesized by the template method, mesoporous aluminium oxide synthesized by the template method, mesoporous titanium oxide synthesized by the template method, and mesoporous zirconia synthesized by the template method.

The invention discloses a sandwich-structured nanometer catalytic material. The sandwich-structured nanometer catalytic material is characterized by taking magnetic Fe3O4 nanospheres as a core, nanometer noble-metal particles as an intermediate phase and cerium-titanium composite oxides as a shell, and the nanometer noble-metal particles are selected from one of Au, Pd and Pt. The invention further provides a preparation method of the sandwich-structured nanometer catalytic material. The preparation method includes sequentially preparing the magnetic Fe3O4 nanospheres, a magnetic noble-metal composite microsphere solution, a magnetic noble-metal composite noncrystalline cerium-titanium-silicon material and a magnetic noble-metal composite crystalline cerium-titanium-silicon material, removing SiO2 through an alkali liquor, separating, washing and drying so as to obtain the sandwich-structured nanometer catalytic material high in catalysis activity and thermostability and excellent in magnetic reclaim performance. Reactants can be in full contact with activated noble metal layers through porous passages in the outer oxide shell. The sandwich-structured nanometer catalytic material has a promising application prospect in the fields of biological target therapy, optical nanometer devices, water-gas shift and olefin gas-phase epoxidation.

The invention discloses a mono-disperse noble metal-loaded single-layer hydrotalcite material as well as a preparation method and application thereof. A series of mono-disperse noble metal-loaded single-layer hydrotalcite materials are synthesized through adjusting and controlling the types of hydrotalcite main body laminates and noble metal ions by virtue of a one-step coprecipitation method. Thematerial presents excellent catalytic activity in dehydrogenation coupling reaction. A catalyst prepared according to the invention is easy to operate, noble metals are in a mono-disperse state, andthe catalyst is low in use cost and can be easily produced and used in large scale.

The invention relates to a micro-capsule-structured carbon-sulfur compound and a preparation method and an application thereof. The compound takes lithium sulfide as a capsule-core material, and takes a carbon material and a lithium ion conductor as a capsule-wall material; the capsule-core material is positioned in the hollow capsule-wall material, wherein the capsule-core material is 20-300nm in grain diameter; the capsule wall is 2-50nm in thickness; the content of the capsule-core material accounts for 20-80wt% of the carbon-sulfur compound; and the mass ratio of the carbon material to the lithium ion conductor in the capsule-wall material is (1:99) to (99:1). Based on the structural advantage of the "micro-capsule", a positive electrode material design thought of "capsule core sulfur-carrying, capsule wall sulfur-fixing, hole wall electric conduction and hole channel sold-state lithium conduction" is proposed, so that the utilization rate and the cycling stability of the active material sulfur in a lithium-sulfur battery are greatly improved.

The invention discloses a preparation method of a cobalt-zinc loaded bimetallic nano carbon material with efficient oxidation performance on magnesium sulfite. The composite material is a cobalt-zincbimetal particle modified porous carbon material, and the preparation method comprises the following steps: mixing and stirring a self-made metal organic framework ZIF-8 and cobalt nitrate hexahydratein a methanol solution, heating, centrifuging, and calcining the dried mixture in a protective atmosphere to obtain the cobalt-zinc bimetal loaded nano carbon material. According to the method, a metal organic framework material containing cobalt and zinc is used as a precursor, modification of a porous carbon material by cobalt-zinc bimetal is completed by a one-step method, and the synthesis process is green and environment-friendly; the synthesized metal-modified porous carbon material can realize efficient catalytic oxidation of magnesium sulfite.

The invention discloses a preparation method of a high-activity catalyst used for catalyzing isomerization of glucose. The preparation method specifically comprises the steps that magnesium salt, niobium hydroxide and other active centers are evenly dispersed in a high-amylose hydrogel containing urea and thiourea, after freeze drying, high-temperature roasting is carried out under the inert gas atmosphere, and the MgO / Nb2O5 catalyst taking N and S doped activated carbon as a carrier is obtained. The catalyst can be uniformly dispersed in a solvent system, reduces the aggregation among the active centers, and can efficiently catalyze the glucose isomerization into fructose under the mild conditions. The provided catalyst has the advantages that the preparation process is simple, the catalytic efficiency is high, and reliable technical support is provided for the industrialized popularization of the high value-added fructose prepared by the glucose isomerization.

The invention discloses a sandwich-structured nanometer catalytic material. The sandwich-structured nanometer catalytic material is characterized by taking magnetic Fe3O4 nanospheres as a core, nanometer noble-metal particles as an intermediate phase and cerium-titanium composite oxides as a shell, and the nanometer noble-metal particles are selected from one of Au, Pd and Pt. The invention further provides a preparation method of the sandwich-structured nanometer catalytic material. The preparation method includes sequentially preparing the magnetic Fe3O4 nanospheres, a magnetic noble-metal composite microsphere solution, a magnetic noble-metal composite noncrystalline cerium-titanium-silicon material and a magnetic noble-metal composite crystalline cerium-titanium-silicon material, removing SiO2 through an alkali liquor, separating, washing and drying so as to obtain the sandwich-structured nanometer catalytic material high in catalysis activity and thermostability and excellent in magnetic reclaim performance. Reactants can be in full contact with activated noble metal layers through porous passages in the outer oxide shell. The sandwich-structured nanometer catalytic material has a promising application prospect in the fields of biological target therapy, optical nanometer devices, water-gas shift and olefin gas-phase epoxidation.

The invention relates to the field of electrolytic packing preparation, and provides a method for synthesizing electrolytic packing in iron carbon through in-situ carbothermic reduction. The method comprises the following steps of oxidization modification, wherein coal pitch is dispersed into a Fenton reagent, the mass ratio of the coal pitch to the Fenton reagent is 1:(5-100), after a hydrothermal reaction is performed for 3-12 h at the temperature of 150 DEG C-250 DEG C, an active regulator is added, the hydrothermal reaction is continuously performed for 3-10 h at the temperature of 150 DEG C-200 DEG C, centrifugal separation is performed, and drying is performed for 4-6 h at the temperature of 120 DEG C-150 DEG C; in-situ reduction, wherein the obtained modified matter is roasted for 2-8 h at the temperature of 500 DEG C-1200 DEG C. The method is low in cost and simple in preparation process, and the prepared iron carbon packing is developed in pore structure and high in metal active component dispersity and wastewater treatment capacity.

The invention discloses a method for degrading polycyclic aromatic hydrocarbon wastewater based on layered titanium lanthanum niobate as a catalyst. Precursors such as a lanthanum salt, niobium hydroxide and a titanate are uniformly dispersed, and are calcined at a high temperature to obtain the layered titanium lanthanum niobate catalyst. The degradation of polycyclic aromatic hydrocarbons such as naphthalene, acenaphthene, acenaphthylene and fluorenes in wastewater is efficiently catalyzed under the action of ultraviolet light and the catalyst. The method provided by the invention has the advantages of simple process, high catalysis efficiency and low energy consumption, and provides reliable technical support for promoting pollutant treatment and environmental restoration.

The invention provides CNTs / Fe3O4 / melamine composite carbon foam as well as a preparation method and application of the CNTs / Fe3O4 / melamine composite carbon foam. The preparation method comprises the following steps: by taking melamine sponge as a raw material, sequentially carrying out a carbonization process and a carbon nanotube in-situ growth process to prepare a flexible carbon matrix material, then carrying out in-situ growth of an iron-based MOFs crystal material on the surface of the flexible carbon matrix material to obtain a CNTs / Fe-MOFs / melamine composite material, and carrying out carbonization treatment to obtain the flexible CNTs / Fe3O4 / melamine composite carbon foam. According to the composite carbon foam prepared by the method, high dispersion of Fe3O4 nanoparticles is realized, so that the electromagnetic shielding performance of the composite foamy carbon can be improved. The material is used in the field of electromagnetic shielding and shows excellent electromagnetic shielding performance.

The invention discloses a preparation method of a supported cobalt-zinc bimetallic nano-carbon material with high oxidation performance to magnesium sulfite. The composite material is a porous carbon material modified by cobalt-zinc bimetallic particles. The preparation steps include: self-made The metal-organic framework ZIF-8 and cobalt nitrate hexahydrate are mixed and stirred in methanol solution, heated and centrifuged, and the dried mixture is calcined in a protective atmosphere to obtain a cobalt-zinc bimetallic nanocarbon material. The method of the invention uses a metal-organic framework material containing cobalt and zinc as a precursor, the modification of the cobalt-zinc bimetal to the porous carbon material is completed in one step, and the synthesis process is green and environmentally friendly; Efficient catalytic oxidation of magnesium.

The invention discloses a mono-disperse noble metal-loaded single-layer hydrotalcite material as well as a preparation method and application thereof. A series of mono-disperse noble metal-loaded single-layer hydrotalcite materials are synthesized through adjusting and controlling the types of hydrotalcite main body laminates and noble metal ions by virtue of a one-step coprecipitation method. Thematerial presents excellent catalytic activity in dehydrogenation coupling reaction. A catalyst prepared according to the invention is easy to operate, noble metals are in a mono-disperse state, andthe catalyst is low in use cost and can be easily produced and used in large scale.

The invention relates to a boron nitride composite mesoporous oxide nickel-based catalyst and a preparation method thereof. The nano-boron nitride as the carrier having high thermal stability and carbon deposition resistance is combined with active metal anchoring and dispersion based on mesoporous oxides so that the catalytic material having high resistance to sintering and carbon deposition is obtained. The preparation method comprises adding a surfactant and ammonia water into high thermal stability boron nitride and nickel precursors as reactants, carrying out ultrasonic agitation, loading active metal components to the boron nitride nanosheet layer, and carrying out in-situ coating on the surface with an oxide having a mesoporous channel structure. The coated mesoporous structure can realize high dispersion of the active nickel component. Through drying, high temperature calcination and programmed heating reduction, the nickel-based catalyst having high performances and a novel structure is prepared. The boron nitride composite mesoporous oxide nickel-based catalyst has the advantages of simple process, low production cost, no environment pollution and high catalytic efficiency.

The invention relates to a liquid-liquid heterogeneous mixing-reaction-separation integrated short-contact cyclone reactor, belongs the field of liquid-liquid heterogeneous mixing equipment, and particularly relates to a short-contact cyclone reactor integrating mixed reaction and separation. The reactor is characterized in that a light phase liquid inlet pipe (3) is arranged at one side of an outer barrel (4), a material circulating structure (9) for communicating an inner cavity of an inner barrel (5) with an annular cavity is arranged on the wall of the inner barrel (5); a light phase overflow outlet pipe (1) is arranged on the inner upper part of the inner barrel (5) in a sleeving manner, an annular mixing cavity is formed between the light phase overflow outlet pipe (1) and the inner barrel (5), the upper part of the light phase overflow outlet pipe (1) extends out of the inner barrel (5), and a heavy phase underflow out pipe (7) is fixedly arranged on the lower part of the inner barrel (5) in a sleeving manner by a conical pipe (6). According to the invention, the integrated process of quick mixing, quick reaction and quick separation of heterogeneous liquid is realized, the equipment structure is compact, the handling capacity is large, continuous operation is realized, and the reactor has the advantages of being low in maintenance cost and strong in adaptability.