9results about How to "Larger than surface" patented technology

The invention discloses a Fe3O4 (at) FeMgAl-LDH (layered double hydroxide) magnetic catalyst. The Fe3O4 (at) FeMgAl-LDH magnetic catalyst comprises FeMgAl-LDH and Fe3O4, the FeMgAl-LDH is prepared by taking a solution A and a solution B as raw materials and adopting a coprecipitation reaction; the solution A is a mixed aqueous solution of Fe < 3 + >, Al < 3 + > and Mg < 2 + >, and the solution B is a mixed aqueous solution of OH <-> and CO3 < 2->. By adding the magnetic Fe3O4, the specific surface area of the catalyst is increased, the dispersity and catalytic activity of the catalyst are improved, the raw material conversion rate and the product yield are remarkably increased, and recycling of the catalyst is facilitated. The invention discloses an application of a Fe3O4-coated FeMgAl-LDH magnetic catalyst in catalysis of a condensation reaction of furfural and acetone. Under the optimal reaction condition, the conversion rate of furfural reaches 100%, and the total yield of a primary condensation product FAc and a secondary condensation product F2Ac is 99.8% or above.

The invention relates to the technical field of new energy materials, and discloses a silicon-containing carbon-based negative electrode material and a preparation method and application thereof. The negative electrode material is prepared by depositing nano-silicon in the pores of a nitrogen / sulfur-doped microporous carbon material using a vapor deposition method, wherein the nitrogen / sulfur-doped microporous carbon material is prepared by using chemically cross-linked dextran aerogel as a carbon precursor and is prepared by carbonization. Since the chemically cross-linked dextran aerogel has a uniform and dense micro-nanoscale pore structure, the prepared nitrogen / sulfur-doped microporous carbon material can have high porosity and a large specific surface area. The material also contains miscellaneous elements doped therein, and the nano-silicon is coated with the aerogel as a coating material. The formed silicon-containing carbon-based negative electrode material has strong conductivity, good cycle stability, and high specific capacity, and can be used as an excellent negative electrode material for lithium-ion batteries.

The invention discloses a method for preparing a palladium-based high-efficiency catalyst, comprising the following steps: 1) adding all reducing solvents, palladium salts and half of the dispersant to a reaction container in sequence, stirring evenly, heating to the reaction temperature for reaction, dropping the remaining half of the dispersant, continuing stirring after the reaction is completed and naturally cooling to room temperature to obtain a mother liquor containing palladium nanoparticles; 2) filtering the mother liquor, then adding deionized water and a fluorine-containing surfactant, stirring and mixing evenly to obtain a palladium-based high-efficiency catalyst. The preparation method of the invention obtains a high content of palladium nanoparticles in the mother liquor of the palladium-based high-efficiency catalyst, a high degree of preparation reduction, and a high yield; the average particle size of the palladium nanoparticles is small and evenly distributed, all in the range of 2 to 8 nm; the palladium-based high-efficiency catalyst has good stability at room temperature; the palladium nanoparticles in the palladium-based high-efficiency catalyst have a large specific surface area, and the efficiency of catalytic preparation of the current collector is high and the effect is good.

The invention relates to a composite material catalysis technology, and aims to provide a preparation method of a diatomite composite catalytic material. The method comprises the steps that diatomite is subjected to acid leaching modification treatment and then used for a hydrothermal reaction to achieve loading of precious metal active components, and a reaction system comprises a precious metal nitrate aqueous solution, modified diatomite and a proper amount of distilled water; and carrying out suction filtration, washing and drying on the reaction product, and calcining by using an ink method or a Joule thermal method to obtain carbon paper capable of being used as an electrode, and loading the diatomite composite catalytic material on the carbon paper. The diatomite composite catalyst used in the invention can effectively realize electrocatalytic reduction from carbon dioxide to carbon monoxide, and has good conversion efficiency and carbon monoxide yield; the composite catalyst has a developed pore structure and a relatively large specific surface and is beneficial to capture and diffusion of carbon dioxide, the rough carrier surface is beneficial to uniform dispersion of loaded noble metal, nano-scale growth of metal components is realized, and reaction quality transmission and catalytic activity are comprehensively improved.

The invention discloses a method for preparing a sulfur-doped iron-cobalt-nickel ternary oxide nanotube directly. The method uses a current collector substrate as a working electrode, a Pt sheet as a counter electrode, a saturated calomel electrode as a reference electrode, and a KCl ion electrolyte. By configuring the concentration of the corresponding metal ions and the sulfur source in the corresponding salt solution, and setting the redox voltage interval to 1.2 V to 0.2 V, the metal ions are first adsorbed within the reduction voltage range, and deposited on the current collector surface in the form of hydroxides to form crystal seeds, inducing the growth of subsequent crystals, and obtaining sulfur-doped iron-cobalt-nickel ternary oxide nanotubes grown along the surface of the current collector substrate material. The preparation method of the present invention can directly obtain sulfur-doped iron-cobalt-nickel ternary metal oxide nanotubes grown along the current collector surface, without the need for intermediate template materials such as carbon nanotubes, etc., and successfully avoids the loss of active sites of the material part due to the intervention of inactive intermediate carrier materials, which is beneficial to guaranteeing and improving the effective activity of the material.

This invention relates to a magnesium-based composite hydrogen storage material regulated by UiO-66, its preparation method, and its application. The high-performance magnesium-based composite hydrogen storage material provided comprises MgH2 and UiO-66, wherein MgH2 powder is the main phase, and UiO-66 is a high-temperature resistant metal-organic framework (MOF) composed of Zr, O, and C, possessing a large specific surface area and ultra-high structural stability, and plays a catalytic role. It is synthesized by hydrothermal and calcination methods. Compared with existing technologies, the magnesium-based composite hydrogen storage material provided by this invention has a dehydrogenation temperature range of 180 ℃–271 ℃ and a dehydrogenation activation energy as low as 69.26 kJ / mol. ‑1 It also possesses rapid room-temperature hydrogen absorption capacity and excellent circulating hydrogen storage performance, which is of great significance for promoting the application of MgH2 and improving its hydrogen storage performance.

The invention discloses an in-situ construction method of an artificial island for ecological restoration, and relates to the technical field of river channel ecological restoration. An outer net and an inner net frame of an artificial island are constructed in situ on a river channel, and a near-natural structural area and a suspended filler area are formed by using a filler. The specific steps are to form an inner net frame and an outer net frame of an artificial island, and fill the inner net frame and the outer net frame of the artificial island with natural stones, crushed stones and soil to form the near-natural structural area of ​​the artificial island, and fill the inner net frame of the artificial island with crushed stones and modified activated carbon suspended fillers to form the suspended filler area of ​​the artificial island, and plants form a vegetation layer on the fill layer, and a blocking net is set on the top of the suspended filler area to complete the construction of the artificial island. The invention realizes the construction of an in-situ artificial island, can reduce the construction difficulty, shorten the construction period, does not need to replace the riverbed sediment, reduces the water quality deterioration caused by the construction, and is more conducive to the improvement of the water quality of the river channel.

The invention discloses a catalyst for catalytic synthesis of lactide, a preparation method and a method for catalytic synthesis of lactide. The catalyst is prepared by a sol-gel method to obtain a ZnO-SnO substrate, and SO4 2‑ Modification is performed; at the same time, the catalyst is loaded with a polymerization inhibitor of formula I during the process of preparing the catalyst. The catalyst prepared by the present invention has strong thermal stability and is easy to regenerate, and can replace organic zinc / tin catalysts. The catalyst of the present invention is used for high-temperature depolymerization of lactic acid prepolymer to obtain lactide, and the product has high yield and high optical purity, and no high molecular weight still polymer is generated, thereby avoiding the influence of high molecular weight still polymer on recycling, and can effectively simplify the reaction process and reduce production costs.

The invention discloses a digital micro-fluidic chip integrated with a coupling active membrane, the digital micro-fluidic chip comprises a chip top plate and a chip substrate, and the coupling active membrane is arranged on the lower surface of the chip top plate or the upper surface of the chip substrate; the coupling active film is prepared by carrying out secondary photocuring on a photocuring raw material containing a coupling active group. According to the prepared digital micro-fluidic chip, the coupling active group on the surface of the digital micro-fluidic chip can be subjected to covalent coupling reaction with functional groups such as amino, carboxyl, sulfydryl or aldehyde group in biomolecules, so that the connection efficiency and stability of the biomolecules can be greatly improved. The chip can effectively overcome the problems of complex system, high cost, difficult miniaturization and integration and the like caused by using magnetic beads as a solid medium. Besides, the processing process of the coupled active membrane is simple, convenient and rapid, has small influence on the performance of the DMF chip, has the potential of batch replication, and is expected to have very good application prospects in the fields of detection of biological molecules such as nucleic acid and protein, detection, separation and culture of microorganisms and cells and the like.