42results about How to "Adjustable hole structure" patented technology

The invention discloses a preparation method of a micron-sized monodispersed porous silica microsphere. A novel porous polysilsesquioxane microsphere is taken as a template, direct calcinations is conducted for removing organic components, and thus a monodispersed porous silica microsphere material with the controllable particle size and hole diameter. The invention further discloses the micron-sized monodispersed porous silica microsphere prepared through the preparation method, the particle size of the silica microsphere is 3-10 [mu]m, the pore volume is 0.3-0.9 cm<3>/g, the specific surface area is 100-400 m<2>/g, and the hole diameter is 3-100 nm. Compared with a traditional process, the preparation method is simple, the economical effect is achieved, graded screening is not needed, and the prepared porous silica microsphere is round and normal in shape and uniform in particle size distribution, has a mesoporous structure, can be directly applied to high performance liquid chromatography stationary phases, and can also be applied to the fields such as catalytic carriers, coating and cosmetic additives.

The present invention relates to the field of structured catalytic materials, in particular to a foam-structure catalyst used in a reaction for preparing benzyl alcohol from benzaldehyde through hydrogenation and a preparation method thereof. The objective of the invention is to overcome the problems that conventional granular catalysts are prone to wearing; the catalysts are difficult to separate from reaction products; recovery processes are complex; etc. The foam-structure catalyst in the invention is of a three-dimensional interconnected network foam structure; the main structure of the catalyst is composed of a foam ceramic material used as a first carrier, a coating (used as a second carrier), a catalytically active component and the like, wherein the second carrier uniformly coats the surfaces of foam ribs of the first carrier, and the catalytically active component is uniformly supported in the second carrier with a high specific surface area. The foam-structure catalyst of the invention is used for a reaction for preparing benzyl alcohol from benzaldehyde through liquid-phase hydrogenation; technology is simplified; and complicated equipment is not needed. The foam-structure catalyst can enhance the mass transfer process of a chemical reaction while avoiding catalyst wearing and simplifying a separation process, and has the advantages of high mass transfer efficiency, good catalytic activity, high benzyl alcohol selectivity and good stability.

The invention belongs to the field of lithium ion battery diaphragm materials and discloses modified silicon dioxide and a lithium ion battery polyolefin microporous diaphragm. The diaphragm is prepared by the following method: blending modified silicon dioxide with polyolefin having high/ultrahigh molecular weight, adding common polyolefin, and pelleting so as to obtain modified masterbatch; mixing the modified masterbatch with polyolefin and then carrying out melt blending and extrusion so as to form a diaphragm with a hard elastic structure; and carrying out continuous tension on the diaphragm, and then carrying out heat shaping at the temperature of 100-150 DEG C so as to obtain the lithium ion battery polyolefin microporous diaphragm. According to the invention, the thickness of the lithium ion battery polyolefin microporous diaphragm is relatively low (less than 15mu m); the strength of the diaphragm is better (the longitudinal breaking strength is larger than 100MPa, the transversal breaking strength is about 8MPa, and breaking elongation is 50%); the porosity and pore structure of the diaphragm are adjustable (the porosity is more than 50%, and the pore diameter is 0.1-1mum); and the thermal shrinkage factor of the diaphragm is smaller (less than 5%). According to the invention, the defect and lack of the existing dry preparation technology of the lithium ion battery diaphragm are overcome.

The invention discloses a polymer-supported dual-core acid ion liquid catalyst and preparation and application thereof. According to the polymer-supported dual-core acid ion liquid catalyst, vinylbenzyl chloride and vinyl benzene serve as polymeric monomers, divinyl benzene serve as cross-linking agent, polymers obtained through free radical polymerization serve as carriers, bis(2-chloroethyl) amine, benzimidazole, 1, 3-propane sultone and concentrated sulfuric acid or trifluoromethanesulfonic acid serve as the raw materials, and through a bonding method, effective immobilization of ionic liquid onto polymeric microspheres can be achieved. The polymer-supported dual-core acid ion liquid catalyst blends the advantages of the ionic liquid and polymers and has the advantages of being large in specific surface area, adjustable in pore structure, high in hydrophobicity, simple in preparation method, high in catalytic activity and mass transfer rate, good in selectivity, high in stability, easy to recover and separate, environmentally friendly, broad in industrialized application prospect and the like. When applied to esterification reaction of various acids and alcohols, the polymer-supported dual-core acid ion liquid catalyst can achieve good effects.

The invention belongs to the field of synthesis of environmental nanomaterials, and provides a preparation method of MXene aerogel with a spherical pore structure. The MXene aerogel with the three-dimensional spherical pore structure is constructed through a template induction method and an emulsion method, and the preparation method comprises the steps of preparation of polystyrene (PS) microspheres, preparation of a Ti3C2Tx MXene dispersion liquid, preparation of PS (at) MXene, preparation of Jauns MXene and preparation of the MXene aerogel. The process is simple and convenient to operate and simple in flow, and the prepared MXene aerogel with the spherical pore structure is light in density, rich in micropores, adjustable in pore structure and wide in application value, and can be applied to the fields of electromagnetic shielding, capacitive deionization, electro-adsorption and the like.

The invention provides a hollow nitrogen-doped carbon sphere supported metal catalyst and a preparation method and application thereof.The preparation method is divided into two methods, one method is a direct synthesis method, firstly, a hard template is prepared, dopamine hydrochloride serves as a nitrogen source and a carbon source to be polymerized on the surface of the hard template, after a metal source is added, the metal source is attached to the template, and the hollow nitrogen-doped carbon sphere supported metal catalyst is obtained; and roasting to finally form the nitrogen-doped hollow carbon sphere loaded metal nano-catalyst. According to the post-synthesis method, dopamine hydrochloride is added into a prepared hard template to serve as a nitrogen source and a carbon source, the nitrogen source and the carbon source are polymerized and roasted on the hard template to form nitrogen-doped hollow carbon spheres, and a metal source is added on the basis of the nitrogen-doped hollow carbon spheres, so that the metal source is loaded on the nitrogen-doped hollow carbon spheres. According to the two methods, nitrogen-doped hollow carbon spheres are prepared on the basis of taking polystyrene as a hard template, and the nitrogen-doped hollow carbon spheres are taken as a frame structure.

The invention provides a cobalt-based mesoporous material Co-TUD-1 catalyst and a preparation method and application thereof, belonging to the technical field of composite materials. The cobalt-basedmesoporous material Co-TUD-1 catalyst comprises TUD-1 and cobalt cations loaded on the pore wall of the TUD-1. The cobalt-based mesoporous material Co-TUD-1 catalyst has a cobalt-silicon molar ratio of 8-80%. The cobalt-based mesoporous material Co-TUD-1 catalyst has high specific surface area, adjustable pore structure and high catalytic efficiency when used for catalyzing magnesium sulfite oxidation. The results show that the cobalt-based mesoporous material Co-TUD-1 catalyst has a sponge-like mesoporous structure, has a specific surface area of 400-1000m<2>/g and a pore diameter of 2.5-25 nm, and can reach a catalytic rate of 0.1015 mmol/L/s when being used for catalyzing the magnesium sulfite oxidation.

The present invention relates to a bifunctional catalyst of a sodium-free aluminosilicate acidic molecular sieve encapsulating metal nanoparticles and a preparation method thereof. The bifunctional catalyst is added with a metal precursor during the in-situ synthesis process of a sodium-free aluminosilicate acidic molecular sieve. Utilize the "one-step method" to realize the encapsulation of metal nanoparticles by sodium-free silica-alumina acidic molecular sieve, and obtain a dual-functional catalyst with both metal hydrogenation/dehydrogenation function and molecular sieve acid catalytic function; the metal content in the dual-functional catalyst is 0.1-10wt %, the distribution of metal nanoparticles is uniform, the particle size is uniform, and the size is 1-10nm.

The invention discloses a method for preferentially adsorbing and separating ethylbenzene from a C8 aromatic hydrocarbon isomeride mixture, which comprises the following steps: by taking a microporous material synthesized from a carboxylic acid ligand and metal ions as an adsorbent, carrying out contact adsorption on the C8 aromatic hydrocarbon isomeride mixture containing ethylbenzene and the adsorbent, selective adsorption separation of ethylbenzene from a C8 aromatic hydrocarbon isomeride mixture is realized; the microporous material synthesized by carboxylic acid ligands and metal ions is a porous material formed by metal ions M and carboxylic acid organic ligands through coordinate bonds, and the general formula is [M3L6] n, 1 is an integer, and L represents HCOO-; the metal ion M is at least one of Co < 2 + >, Ni < 2 + > and Mg < 2 + >; and the carboxylic acid organic ligand is HCOOH.

The invention discloses a composite molecular sieve carbon film based on a phenolic resin-based carbon tube as a support body and a preparation method thereof. The composite molecular sieve carbon membrane comprises a carbon tube support body and a carbon membrane separation layer, the carbon membrane separation layer is attached to the outer surface or the inner surface of the carbon tube support body, the carbon tube support body is of a carbon-containing porous tubular structure, the average pore diameter is 0.05-0.5 micron, the porosity is 20-80%, the average pore diameter of the carbon membrane separation layer is smaller than 10nm, and the porosity is 20-40%. And the carbon tube support body and the carbon membrane separation layer are both made of a carbon material. As a carbon tube support body precursor and a separation layer precursor are jointly subjected to curing and carbonization treatment to obtain the support body and the separation layer which are both made of carbon materials, the problem that the membrane performance is reduced due to a two-phase gap in a composite carbon membrane in the prior art is solved, the preparation process is simple, the process parameters are controllable, the preparation cost is saved by about 50%, and the permeation flux of the membrane performance is improved by more than 20%.