46results about How to "Improve surface chemical activity" patented technology

The invention discloses novel composite-carrier honeycomb monolithic denitration catalyst, in particular to honeycomb monolithic SCR (selective catalytic reduction) denitration catalyst with modified cordierite and titanium dioxide as a composite carrier and a preparing method of the honeycomb monolithic SCR denitration catalyst. The novel composite-carrier honeycomb monolithic denitration catalyst includes the following components, 10-25wt% of modified cordierite powder, 65-85wt% of titanium tungsten powder (containing 3-10wt% of WO3), 1-2wt% of V2O5, and the balance additive which is glass fiber or polyvinyl alcohol. The novel composite-carrier honeycomb monolithic denitration catalyst is prepared from following steps of mixing, mud refining, extrusion forming, drying and roasting, has the advantages of chemical stability, thermostability and wear-resisting property, and expresses higher catalytic activity of NH3-SCR and wider active temperature window. Cordierite power at low cost is utilized to substitute part of imported titanium tungsten powder and serve as the carrier for the SCR denitration catalyst which is simple to prepare, degree of dependence on imported titanium tungsten powder is reduced, and the defects that the carrier for existing SCR denitration catalyst is unstable in mechanical performance and high in price are overcome.

The invention discloses a tin dioxide nanoflower with a hollow structure and a preparation method of the tin dioxide nanoflower, belonging to the technical field of nanomaterials and solving the technical problems that a preparation method of tin dioxide nanoparticles is complex in operation and high in cost and tin dioxide nanoparticles with complex appearances cannot be prepared in the prior art. The nanoflower is composed of more than one subunit, wherein all the subunits share the same geometric central point; each subunit is composed of a hollow tin dioxide sheet layer and a solid tin dioxide sheet layer which are respectively of a regular hexagonal structure; the hollow tin dioxide sheet layer is composed of a shell and an inner cavity; the solid tin dioxide sheet layer is parallel to the hollow tin dioxide sheet layer and shares the same geometric central point with the hollow tin dioxide sheet layer; and the solid tin dioxide sheet layer is arranged in the hollow tin dioxide sheet layer to divide the inner cavity into two regions. The nanoflower is of a hollow hierarchical structure and is good in monodispersity and crystallinity, large in specific surface area and favorable in gas sensibility.

The invention relates to the technical field of nano materials, in particular to a preparation method and application of a two-dimensional lead telluride nano sheet and a nano material. The method comprises the steps that a reaction raw material which is used for the growing of the lead telluride nano sheet is weighed; a sheet-like material with a surface with an atomic level smoothness is taken as a growing substrate; the reaction raw material is thermostatically heated to perform vapor deposition in a protective gas flow after programmed temperature increasing; the substrate is allowed to bequenched after the decomposition process is completed, and the two-dimensional lead telluride nano sheet is obtained on the substrate. The thickness of the nano sheet is 5 nm-200 nm, the width or length is 0.1-70 microns, and the nano sheet is provided with a monocrystalline structure. The nano sheet is of a face-centered cubic crystal, and the exposed crystal face of the nano sheet belongs to {100} crystal face family and is provided with a sheet-like rectangular morphology; the ultra-thin two-dimensional lead telluride nano sheet with large area, uniform orientation and morphology and crystallinity can be obtained through a Van der waals epitaxy technology, and the two-dimensional lead telluride nano sheet can be applied to the fields of infrared ray photoelectric detectors and the like.

The invention discloses a preparation method of a magnetic biomass functional carbon fiber based on photo-Fenton catalysis. The method includes: taking a biomass material as the raw material, performing hydrothermal treatment to extract plant fiber, and then conducting charing, polydopamine modification and loading of ferriferrous oxide and titanium dioxide nanoparticles, thus obtaining the functional carbon fiber. The magnetic biomass functional carbon fiber prepared according to the invention includes carbon fiber and ferriferrous oxide nanoparticles and titanium dioxide nanoparticles loadedon the carbon fiber in situ. The magnetic biomass functional carbon fiber provided by the invention can be applied to photo-Fenton treatment of wastewater, and has the advantages of low raw materialcost, simple preparation method, magnetic recoverability in the wastewater treatment process, good treatment effect, etc.

A semiconductor structure and a formation method thereof are disclosed. The formation method of the semiconductor structure comprises the following steps of providing a substrate and forming a through hole in the substrate; forming amorphous silicon layers on a through hole bottom and a sidewall surface; forming a barrier layer on an amorphous silicon layer surface, wherein the barrier layer preferentially orients a crystal plane (111); and forming a metal layer on a barrier layer surface, wherein the metal layer fills in the through hole and the metal layer preferentially orients the crystal plane (111). In the invention, after the amorphous silicon layers are formed on the silicon through hole bottom and the sidewall surface, the barrier layer and the metal layer which preferentially orient the crystal plane (111) are formed on the amorphous silicon layer surface so that an electromigration resistance capability of the metal layer is increased; a resistance of the metal layer is reduced; an electromigration resistance capability of the semiconductor structure is increased; an RC delayed effect of the semiconductor structure is reduced and electric performance of the semiconductor structure is improved.

The invention discloses a preparation method for semiconductor material The preparation method comprises the steps that ethylene and / or acetylene are / is adopted asa carbon source; a chemical vapour deposition method is adopted, and graphene containing surface defect grows on a substrate which metal catalyst is not loaded; and in addition, the grapheme which is formed on the substrate and containsthe surface defects is adopted as a substrate body, and a semiconducting material epitaxially grows on the substrate body directly. According to the preparation method for the semiconductor materials,the graphene containing the great number of defects can be directly prepared through the chemical vapour deposition method; chemical treatment is not needed to be additionally conducted on the surface of the graphene; surface chemistry activity of the graphene can be improved; the graphene which is large in size and is uniformly provided with the great number of defects is obtained; The obtainedgraphene is directly adopted as the substrate body to grow the semiconducting material; transfer is not needed; and the problem that contamination is introduced in the substrate transfer process, so that the growing semiconducting material has macroscopic defects is avoided.

The invention discloses an in-situ preparation method of a layered dihydroxy metal oxide film on the surface of an Al-Cu-Li alloy. The preparation method comprises the following steps: a, pretreating,specifically, the surface of the Al-Cu-Li alloy is pretreated by polishing, alkali etching and acid washing to the pretreated Al-Cu-Li alloy; b, preparing a lithium carbonate solution with the concentration of 0.05-0.15M and the pH of 11.5-13.0; AND c, putting the pretreated Al-Cu-Li alloy obtained in the step a into the lithium carbonate solution in the step b, heating at a constant temperaturefor 10-60min under an atmospheric environment and a temperature of 25-70 DEG C, taking out the treated Al-Cu-Li alloy, rinsing with deionized water, drying and growing the on the surface of the Al-Cu-Li alloy in situ to obtain the layered dihydroxy metal oxide film. The uniform and compact LDH film can be prepared on the surface of the Al-Cu-Li alloy in situ, the corrosion resistance of the alloyis remarkably improved, the reaction condition is mild, and the method is suitable for industrial production.

The invention belongs to the field of plastic processing, and relates to a plastic deformation method for achieving structural performance optimization of an inner surface of a straight pipe. High-speed shearing deformation is carried out on the inner surface of the metal straight pipe in a point contact mode, so that the structural performance of the inner surface of the pipe fitting is optimized. The plastic deformation method for achieving the structural performance optimization of the inner surface of the straight pipe has the following technical advantages that the point contact is introduced into the high-speed shearing plastic deformation, and effective cooling in straight pipe processing is achieved; the uniformity and the collimation degree of the wall thickness is effectively guaranteed before and after straight pipe processing; a 500-micron plastic deformation surface layer is formed on the inner surface of the straight pipe, so that the hardness and the strength of the inner surface of the straight pipe are improved by 5-20 times, and the surface quality is improved until the roughness Ra is 0.02-0.2; and the chemical activity of the inner surface of the straight pipe is greatly improved, and the temperature of chemical heat treatment such as nitrizing and carburizing is reduced by 200 DEG C or above.

The invention relates to a heavy metal repairing agent for soil and a preparation method thereof. The heavy metal repairing agent for soil is prepared from modified porous ferroferric oxide, modifiedactivated carbon and modified imvite, the modified porous ferroferric oxide is prepared from porous ferroferric oxide, ethylene diamine tetraacetic acid and mercaptoethanol through a reaction, and theporous ferroferric oxide is prepared from ferric sulfate, urea, water, iron powder, ethylene diamine tetraacetic acid, trioxymethylene, oxalic acid, a KH-550 coupling agent and ethyl alcohol througha reaction; the modified activated carbon is prepared from activated carbon, hydrogen peroxide, concentrated nitric acid, ethylene diamine tetraacetic acid and 12-sulfydryl lauric acid through a reaction, and the modified imvite is prepared from imvite, ethylene diamine tetraacetic acid, mercaptoacetic acid and quadrol through a reaction. The heavy metal repairing agent for soil has excellent performance for reducing heavy metal ion content in soil.

The invention discloses a surface treatment method for improving corrosion resistance of an aluminum alloy. Firstly, sand blasting treatment is carried out on the surface of the aluminum alloy, foreign matter and non-compact oxide skin adhering to the surface of the aluminum alloy are removed, and the fresh surface of the aluminum alloy is exposed; and then, a plasma spraying method is adopted forcarrying out high-temperature plasma surface oxygen-rich ion treatment on the surface of the aluminum alloy, that is, O2 is added on the basis of adopting Ar and H2 as plasma gas in traditional plasma spraying, O2 is ionized under high temperature and reacts with the aluminum alloy, a compact corrosion-resistant Al2O3 film is formed on the surface of the aluminum alloy, and therefore the corrosion resistance of the aluminum alloy is improved. Compared with the traditional aluminum alloy corrosion protection technology, the surface treatment method has the advantages of being efficient, low incost, free of waste water and waste gas pollution and the like.

The invention discloses novel composite-carrier honeycomb monolithic denitration catalyst, in particular to honeycomb monolithic SCR (selective catalytic reduction) denitration catalyst with modified cordierite and titanium dioxide as a composite carrier and a preparing method of the honeycomb monolithic SCR denitration catalyst. The novel composite-carrier honeycomb monolithic denitration catalyst includes the following components, 10-25wt% of modified cordierite powder, 65-85wt% of titanium tungsten powder (containing 3-10wt% of WO3), 1-2wt% of V2O5, and the balance additive which is glass fiber or polyvinyl alcohol. The novel composite-carrier honeycomb monolithic denitration catalyst is prepared from following steps of mixing, mud refining, extrusion forming, drying and roasting, has the advantages of chemical stability, thermostability and wear-resisting property, and expresses higher catalytic activity of NH3-SCR and wider active temperature window. Cordierite power at low cost is utilized to substitute part of imported titanium tungsten powder and serve as the carrier for the SCR denitration catalyst which is simple to prepare, degree of dependence on imported titanium tungsten powder is reduced, and the defects that the carrier for existing SCR denitration catalyst is unstable in mechanical performance and high in price are overcome.

The invention relates to a method for preparing titania raw materials with high specific surface area used by denitration catalyst, which relates to the chemical product preparation technical field. The method comprises the following steps that: a metatitanic acid produced by adoption of the sulfuric acid method is processed by an organic surfactant and then modified so as to reduce the viscosityof the metatitanic acid; and loose titania products with high specific surface area and high surface chemical activity used by the denitration catalyst are prepared through filtration and calcinationof the processed metatitanic acid. The method has a simple technique for processing the metatitanic acid and has low cost; and added organic substances are fully decomposed during the calcining stage, thereby impurities can not be brought into the final products and the environmental pollution can not be caused.

The invention discloses a production method of a carbon-doped hydroxyapatite defluorination filter material. The method comprises the steps of adopting industrial calcium nitrate, phosphoric acid, ammonia water and ammonium bicarbonate as raw materials; and synthesizing the carbon-doped hydroxyapatite defluorination filter material, wherein the ammonia water is capable of playing a role in regulating the pH value of a reaction system to ensure the purity and defluorination capacity of a product. The doping amount of the ammonium bicarbonate is extremely low. Crystal lattices of hydroxyapatite distort due to doping of CO3<2->, the hole concentration of the surface is correspondingly increased, the structure becomes loose, and the surface chemical activity is correspondingly strengthened, so that the defluorination ability is improved; and the total defluorination capacity of the filter material is improved by 3-4 times in comparison with that of a single hydroxyapatite defluorination filter material and improved by over 7 times in comparison with that of an activated aluminum oxide defluorination filter material. The method is simple, the defluorination effect is stable for a long period of time, and the production efficiency is higher.

The invention discloses a production method of a carbon-doped hydroxyapatite defluorination filter material. The method comprises the steps of adopting industrial calcium nitrate, phosphoric acid, ammonia water and ammonium bicarbonate as raw materials; and synthesizing the carbon-doped hydroxyapatite defluorination filter material, wherein the ammonia water is capable of playing a role in regulating the pH value of a reaction system to ensure the purity and defluorination capacity of a product. The doping amount of the ammonium bicarbonate is extremely low. Crystal lattices of hydroxyapatite distort due to doping of CO3<2->, the hole concentration of the surface is correspondingly increased, the structure becomes loose, and the surface chemical activity is correspondingly strengthened, so that the defluorination ability is improved; and the total defluorination capacity of the filter material is improved by 3-4 times in comparison with that of a single hydroxyapatite defluorination filter material and improved by over 7 times in comparison with that of an activated aluminum oxide defluorination filter material. The method is simple, the defluorination effect is stable for a long period of time, and the production efficiency is higher.

The invention relates to a heavy metal restoration agent for soil and a preparation method thereof. The heavy metal remediation agent for soil is composed of modified porous ferric oxide, modified activated carbon and modified montmorillonite, and the modified porous ferric oxide is composed of porous ferric oxide, ethylenediaminetetraacetic acid and mercapto Prepared by ethanol reaction, the porous ferric ferric oxide is prepared by the reaction of ferric sulfate, urea, water, iron powder, ethylenediaminetetraacetic acid, paraformaldehyde, oxalic acid, KH-550 coupling agent and ethanol, the modified Activated carbon is prepared by the reaction of activated carbon, hydrogen peroxide, concentrated nitric acid, ethylenediaminetetraacetic acid and 12-mercaptododecanoic acid, and the modified montmorillonite is made of montmorillonite, ethylenediaminetetraacetic acid, thioglycolic acid and ethylenediamine The reaction is made. The heavy metal remediation agent for soil provided by the invention has excellent performance in reducing the content of heavy metal ions in soil.

The invention relates to a surface treatment agent and its preparation method and application, in particular to a surface treatment agent and its preparation method and its application in the bonding of the silicone rubber heat insulating layer and the butyl hydroxy lining layer, belonging to the solid rocket motor heat insulating layer bonding In the field of jointing technology, it is especially related to the technology of enhancing the interface bonding between the silicone rubber heat insulating layer and the butylated hydroxyl lining layer. Compared with traditional silicone rubber surface treatment methods, such as corona and plasma treatment techniques, the viscosity increasing technique adopted in the present invention does not require specific equipment, is easy to operate, and the treated interface has a longer application time.

The invention discloses a method for preparing magnetic biomass functional carbon fibers based on photo-Fenton catalysis. Biomass materials are used as raw materials, plant fibers are extracted through hydrothermal treatment, and then carbonized, polydopamine modified, ferroferric oxide and titanium dioxide nanoparticles loaded to obtain functionalized carbon fibers. The magnetic biomass functional carbon fiber prepared by the present invention includes carbon fiber and Fe3O4 nanoparticles and titanium dioxide nanoparticles loaded on the carbon fiber in situ. The present invention can be applied to photo-Fenton treatment of wastewater, and has the advantages of low raw material cost, The preparation method is simple and has the advantages of magnetic recovery in the process of treating waste water, good treatment effect and the like.