44results about How to "High mesoporosity" patented technology

A method for mass production of high-quality hollow carbon nanocages comprises the following steps: 1) light magnesium carbonate or magnesium carbonate is added into a reaction tube and spread evenly, the tube is put into a tubular furnace, air is pumped out of the tube, inert gas such as N2 and Ar is injected; the reaction temperature is increased to 670 DEG C-900 DEG C, (C) source vapor is introduced, and reaction is carried out for 5 to 240 minutes under the protection of 10-500sccm inert gas atmosphere; the (C) source gas is led to the reaction area of the tubular furnace by the inert gas flow, carbonized on the surfaces of nano particles generated in situ, and covered to form a MgO@C structure; after the reaction, the temperature inside the reaction tube drops to the room temperature under the protection of the inert gas; 2) powder is collected from the reaction tube, dipped in sufficient hydrochloric acid or sulphuric acid for 5 to 720 minutes to remove the kernel of MgO, filtered, washed to neutrality by using deionized water, and dried to obtain the hollow carbon nanocages; and 3) the magnesium salt filtrate is recycled. The nanocages prepared by the method have high purity, and the price for the precursor is low, thereby facilitating recovery and reuse.

A method for producing a titanium dioxide photocatalyst is provided. The method uses a sol-gel process wherein acid and base catalysts are added in two separate steps. According to the method, a titanium dioxide photocatalyst with increased mesoporosity can be produced without the use of any particular additive. Further, an anatase structure is formed upon drying and is maintained even after high-temperature calcination. Further provided is a titanium dioxide photocatalyst produced by the method. Further provided is a titanium dioxide photocatalyst doped with sulfur and zirconium, which is produced by using the method. The doped titanium dioxide photocatalyst exhibits catalytic activity even under visible light and excellent surface characteristics to achieve improved photocatalytic activity.

The invention provides a preparation method of nitrogen-doping ordered mesoporous carbon materials. According to the method, rich-hydroxyl saccharide carbohydrate is used as carbon sources, ammonia water is used as nitrogen sources, amination reaction under the hydrothermal condition is adopted for preparing rich-nitrogen precursors, mesoporous silica molecular sieves SBA-15 (space group P6mm) are used as templates, and the nitrogen-doping ordered mesoporous carbon materials in two-dimensional orthohexagonal ordered mesostructures are prepared through multi-time wetting combined with the high-temperature themolysis technology.

The invention relates to a preparation method of nitrogen and sulfur co-doping ordered mesoporous carbon materials. According to the method, pyrrole is used as carbon sources and nitrogen sources, sulfuric acid is used as acid catalysts and sulfur sources, pyrrole oligomers are used as precursors, mesoporous silica molecular sieves SBA-15 (space group P6mm) and KIT-6 (space group Ia3d) are used as templates, a primary wet impregnation method is combined with the high-temperature themolysis technology for preparing the nitrogen and sulfur co-doping ordered mesoporous carbon materials in two-dimensional orthohexagonal and three-dimensional cubic ordered mesostructures.

The invention provides columnar cocoanut shell activated carbon with high strength and high mesoporosity and a preparation method of the columnar cocoanut shell activated carbon. The columnar cocoanut shell activated carbon has the side pressure of 210N/cm, the strength of larger than or equal to 95% and the mesoporosity of 70-90%. The preparation method of the columnar cocoanut shell activated carbon comprises the steps of crushing and sieving pretreated cocoanut shells; uniformly mixing wood powder with a certain particle size and a specific organic binder; adding phosphoric acid and a proper amount of water according to a certain phosphorus/wood ratio; and sequentially dipping, kneading, carrying out extrusion molding, curing, carbonizing, activating, washing and drying to obtain the columnar cocoanut shell activated carbon. Through condition control, the columnar cocoanut shell activated carbon has the specific surface area of 900-1600 m<2>/g, the pore volume of 0.4-0.8 cm<3>/g and the mesoporosity of 70-90% within a certain high-strength range, and the controllability is also one of the advantages of the columnar cocoanut shell activated carbon. Due to the adoption of a porous structure with high strength and high mesoporosity, the columnar cocoanut shell activated carbon can be used as a solid catalyst in a fixed bed reactor and is wide in application prospect in the catalysis field.

A mesoporous polymer and method of preparing a mesoporous polymer whose polymerization kinetics are dependent upon pH and whose pore size is controlled by pH and solvent concentration are disclosed. The polymer is optionally pyrolyzed to form a primarily carbonaceous solid. The material has an average pore size in the mesopore range and is suitable for use in liquid-phase surface limited applications including chromatographic, sorbent, catalytic, and electrical applications.

The invention provides modified active carbon, and a preparation method and application thereof, belonging to the field of preparation of catalyst carriers. The preparation method comprises the following steps: subjecting graphitized active carbon to treatment with HNO3 and then carrying out high-heat treatment in an ammonia gas atmosphere so as to obtain an active carbon carrier with high mesoporosity. The carrier has the characteristics of a great pore volume, high mesoporosity (no less than 97%), good conductivity, etc. When used as a carrier for an ammonia-synthesis catalyst, the carrier can substantially improve the dispersity of the precious metal ruthenium and improves anti-methanation capability, heat stability and activity of the catalyst. The carrier has wide application prospect in the field of catalysis.

The invention relates to a method for preparing mesoporous carbon and belongs to the technical field of adsorption. The mesoporous carbon is prepared by the steps: by taking ZIF-8 as a precursor, calcining the ZIF-8 by adopting a slow temperature programming carbonization method, controlling the initial oxygen concentration, and producing the mesoporous carbon material. The method disclosed by the invention has the advantages that trace oxygen is added in the ZIF-8 carbonization process, so that the mesoporous rate of the carbonization material is improved, and the prepared mesoporous carbon has excellent adsorptive property in the methylene blue adsorption experiment.

The invention relates to the technical field of carbon aerogels, in particular to an N and P co-doped carbon aerogel and a preparation method and application thereof. The N and P co-doped carbon aerogel is prepared by using biomass fiber as raw material through acidic NaClO2 pretreatment, NH4H2PO4 doping, freezing molding, carbonization treatment and activation treatment, and the method is simplein operation, fully utilizes renewable natural resources, has wide raw material sources, and is green and environment-friendly; wherein, NH4H2PO4 is used as both dopant and activator, which not only saves the cost of raw materials, but also makes the preparation process simple and suitable for large-scale production due to one-step doping of N and P. N and P co-doping overcomes the limitation of low specific capacitance of carbon material itself, and combines two-step activation (carbonization treatment is the first step activation, activation treatment is the second step activation) to make the obtained N and P co-doped carbon aerogel have ultra-high mesoporous ratio, which not only controls the cost but also achieves excellent electrochemical performance effect.

The invention relates to a method for preparing a nitrogen-doped carbon material from biomass. The method comprises the following steps: crushing biomass into fine particles; uniformly mixing the crushed biomass particles with an acidic ammonium salt solution according to a certain ratio to form a mixture; putting the mixture into a hydrothermal reaction kettle, and carrying out a hydrothermal reaction under a certain temperature condition; dehydrating and drying hydrothermal carbon obtained after the hydrothermal reaction; and putting the dried hydrothermal carbon into a pyrolyzing furnace, and carrying out rapid pyrolysis under the protection of an inert atmosphere under a certain temperature condition to obtain a nitrogen-doped carbon material subjected to rapid pyrolysis. According tothe invention, the raw material adopted by the method is renewable energy, covers all biomass raw materials, and has the advantages of rich reserves, low cost and environmental protection compared with coal as a raw material for preparing the activated carbon.

The invention relates to a method for preparing a high-specific-surface-area boron-doped porous carbon material from biomass, which comprises the following steps: pulverizing biomass into fine particles, proportionally and uniformly mixing the pulverized biomass particles with a boric acid-containing water solution to form a mixture, and putting the mixture into a hydrothermal reaction kettle to perform hydrothermal reaction; dehydrating and drying hydrothermal carbon obtained after the hydrothermal reaction; putting the dried hydrothermal carbon into a pyrolyzing furnace, and carrying out rapid pyrolysis under the protection of an inert atmosphere to obtain a biomass source boron-doped porous carbon material with high specific surface area after rapid pyrolysis; the method has the advantages of wide sources of raw materials, simple and green process, lower equipment requirements, short time consumption in the production process and high efficiency, and is suitable for industrial large-scale production.

The invention belongs to the technical field of preparation of inorganic non-metal materials and catalysts, and provides a preparation method for hierarchical-pore ZSM-5 zeolite microspheres, aiming to solve the problems that nano-zeolite is not easy to filter and separate in the preparation and application process and diffusion of reaction molecules in micron-size ZSM-5 zeolite is limited. According to the preparation method, a long-chain alkyl trimethyl ammonium bromide surfactant is taken as a single templating agent, and the hierarchical-pore ZSM-5 zeolite microspheres are compounded in aNaOH-water-ethanol crystallization system. The preparation method has the advantages that the intrinsic framework microporous crystal structure is maintained, and the utilization rate of the active site of the zeolite is increased due to nanocrystallization of zeolite grains and presence of intercrystalline mesopores; the preparation method is simple, economical and green; the diffusion limitationof the reaction molecules such as hydrocarbons in the micron-sized ZSM-5 zeolite is relieved, and the utilization rate of the active site of the zeolite is increased; the problem that the nano-zeolite is not easy to filter and separate during preparation and application is solved, and a new preparation method is provided for the field of zeolite catalysis.

The invention relates to the field of water treatment phosphorus removal, and especially relates to a phosphorus removal matrix material, and a preparation method and application thereof. The preparation method of the phosphorus removal matrix material provided by the invention comprises the following steps: mixing bentonite, quick lime and water to obtain a mixture, wherein the mass ratio of the bentonite to the quick lime to the water is 1: (0.3-0.5): 3; and carrying out heat treatment on the mixture at 150-450 DEG C for 2-6 h to obtain the phosphorus removal matrix material. According to the preparation method of the phosphorus removal matrix material, the bentonite, the quick lime and the water are mixed according to the specific proportion, then the mixture is subjected to heat treatment at the specific temperature, the surface roughness of the prepared phosphorus removal matrix material is obviously improved, and the adsorption capacity of the phosphorus element in the water can be improved.

The invention discloses a preparation method of a racomitrium biochar adsorbent, which comprises the following steps: preparing racomitrium biochar, specifically, washing the racomitrium by using deionized water to remove dust and impurities of the racomitrium, drying the racomitrium at 105 DEG C for 6 hours, crushing, and filtering by using a 0.45 mm screen; the preparation method comprises the following steps: filling 5g of racomitrium canescens into an ark with the volume of 120ml, putting the ark into a tubular furnace, and heating at constant temperature under the continuous nitrogen flow condition of 60cm < 3 >/min to prepare the racomitrium canescens biochar adsorbent, specifically, the constant-temperature heating temperature is 400-1000 DEG C, and the heating time is 60-120min; the preparation method comprises the following steps: spraying silane coupling agent modified Fe3O4-TiO2 mixed slurry on the surface of the racomitrium biochar, washing with water, drying, and activating in a nitrogen atmosphere for 1-3 hours to prepare the racomitrium biochar adsorbent. The racomitrium canescens charcoal adsorbent prepared by the invention has a remarkable surface pore structure and surface groups, is high in mesoporous rate, greatly improves the adsorption capacity to strontium, and provides an important reference material for solving strontium pollution.

The invention is broadly drawn to a process to introduce mesoporosity in faujasite zeolites with Si/Al<5 and unit cell sizes below 24.58 Angstrom by an inventive sequence of acid and base treatments, yielding superior physico-chemical and catalytic properties compared to the materials prepared according to the teachings known in the state of the art. Part of the invention relates to the acid step which is executed in the presence of a salt of which the anion is able to form multi-ligand complexes with aluminum, and of which a specific amount of cations are protonic (ca. 90% to 20% of the total cations with -3<pK<6). The superior properties may be the combination of an enhanced mesoporosity with a higher Brønsted acidity, a higher microporosity, a higher mesoporosity, a higher crystallinity, and/or combinations hereof.

The invention discloses a preparation method of an activated carbon/lithium titanate composite electrode material. The preparation method comprises the following steps: dissolving lithium acetate dehydrate and titanium alkoxides into alcohols solvents according to the atom ratio of Li to Ti being (0.80-0.90) to 1 to obtain a first solution; dissolving phenolic resin into the alcohols solvents according to the mass ratio of phenolic resin to titanium alkoxides being (3-6) to 1 to obtain a second solution; mixing the first solution and the second solution, and polymerizing; stirring the polymer, sealing, heating the solvents for 4-10h at 140-200 DEG C, taking out, and drying to obtain precursor powder; physically activating the precursor powder by utilizing carbon dioxide gas to obtain the activated carbon/lithium titanate composite electrode material, wherein the activating temperature is 700-900 DEG C, and the activating time is 2-5h. The invention also provides the activated carbon/lithium titanate composite electrode material obtained by the method, and a supercapacitor using the composite material.