36 results about "Nanocomposite catalyst" patented technology

The invention relates to a coal chemical wastewater treatment device with nano-catalysis coupled with bioelectrochemistry. The invention belongs to the technical field of coal chemical wastewater treatment. The device comprises a pretreatment area, a bioelectrochemical treatment area, a catalyst recovery area and a clear water area which are connected in sequence, a nano Fe3O4 / TiO2 composite catalyst filling layer and a microporous aeration device are arranged in the pretreatment area; a biological anode region of the biological electrochemical treatment region adopts a graphene modified carbon brush, and a biological cathode region of the biological electrochemical treatment region adopts a sulfur-doped carbon felt; and the catalyst recovery area adopts a high-gradient permanent magnetic roller and is matched with a pulse backwashing system. The treatment cost of each ton of water is reduced to 25-35 yuan, and the cycle life of the catalyst is gt; the time is 200 times; the sulfur can be reused in a desulfurization process of a sewage treatment plant, so that the medicament cost is reduced; the carbon emission is reduced by 60%; the COD removal rate is not less than 95%, the total phenol removal rate is not less than 98%, and the total nitrogen removal rate is not less than 90%; energy consumption is reduced by 40% compared with a traditional electrochemical method, and the catalyst recovery rate is gt; 95%.

The invention discloses a method for efficiently depolymerizing polyethylene glycol terephthalate, which comprises the following steps: mixing a PET material, ethylene glycol and a core-shell type magnetic nano composite catalyst, and carrying out alcoholysis reaction at 160-200 DEG C for 30-180 minutes; after the reaction is finished, separating the catalyst from a reaction system through an external magnetic field to obtain a solution containing bis (2-hydroxyethyl) terephthalate; the core-shell type magnetic nano composite catalyst comprises a magnetic FeO core, a SiO shell layer and active metal sites, the FeO core is coated with the SiO shell layer, the SiO shell layer is an insulating inorganic layer and is of a porous structure, the active metal sites are fixed to the surface of the SiO shell layer through coordinate bonds, and active metal is selected from one or more of Co, Ni, Cu, Ce, La and Al. The problems that an existing PET alcoholysis catalyst is easy to dissolve out, difficult to separate, harsh in reaction condition and poor in cycling stability are solved.

A nanocomposite catalyst for use as an electrode in water electrolysis includes a cobalt triazole (Co-Tri) metal-organic framework (MOF), carbon quantum dots (CQDs), carbon nanosheets (CNs), and an ionically conductive polymer binder. The mass ratio of the nanocomposite catalyst includes cobalt triazole metal-organic framework to the carbon quantum dots is in the range of 1:2 to 1:4, and the mass ratio of the cobalt triazole metal organic framework to the carbon nanosheets mass ratio is in the range of 1:4 to 1:6. The nanocomposite catalyst includes current density less than or equal to (≤) −5 milliampere per centimeter square (mA·cm−2) at an applied potential of −100 millivolts (mV) when catalyzing the hydrogen evolution reaction (HER) in water electrolysis.

The invention provides a Ni-molybdenum oxide / Nb2O5 nano composite catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The catalyst precursor is prepared by adopting an excessive impregnation method, then the Ni-molybdenum oxide / Nb2O5 nano-composite catalyst is prepared by adopting a hydrogen reduction treatment method, active components in the catalyst are uniformly loaded, and the catalyst has excellent self-hydrogen hydrothermal catalytic performance. The Ni-molybdenum oxide / Nb2O5 nano composite catalyst prepared by the invention can minimize the dissociation energy of a C-O bond, promote the breakage of the C-O bond, enable the reaction to be carried out in a forward direction, and realize high-value conversion of guaiacol to catechol under mild reaction conditions without exogenous hydrogen.

The present invention provides a method for preparing a magnesium-based hydrogen storage material and a magnesium-based hydrogen storage material. The method comprises the following steps: introducing hydroxyl groups onto the surface of TiO2 using a hydrothermal method to obtain TiO2 nanotubes, grafting aminopropylsiloxane onto the TiO2 surface to obtain modified TiO2 nanotubes; introducing reduced graphene oxide into the modified TiO2 nanotubes to obtain a graphene@TiO2 nanocomposite catalyst; and introducing the graphene@TiO2 nanocomposite catalyst into nanomagnesium particles using a dry method and a wet ball milling method using cyclohexane as a solvent to obtain a magnesium-based hydrogen storage material. This method can produce a magnesium-based hydrogen storage material with a high hydrogen storage capacity.

The invention relates to a porous ceramic core loaded with a nano composite catalyst and a preparation method thereof, the porous ceramic core comprises a porous ceramic matrix, a nano composite catalyst layer and a surface functionalization layer in sequence, and the porous ceramic matrix is prepared by mixing, pressing and molding bamboo charcoal powder, zeolite powder, alumina powder, mullite powder and lignocellulose and then firing; the nano-composite catalyst layer is composed of g-C3N4 / TiO2 / Ag3PO4 nano-particles loaded on the surface of the porous ceramic matrix and in pore channels of the porous ceramic matrix; the surface functionalization layer is formed by nano-silver particles modified by the surface of the catalyst layer. Through hierarchical pore structure design and heterojunction energy band regulation and control, the synergistic effect of efficient photocatalytic degradation and pollutant adsorption is achieved, the degradation rate of pollutants such as formaldehyde and benzene is high, good adsorption performance, photocatalytic performance and antibacterial performance are achieved, and the preparation method is reasonable in process and easy for large-scale production and can be applied to the field of air purification.

The invention provides a process method for producing ferrotitanium powder by reducing ilmenite, which comprises the following steps of: uniformly mixing ilmenite concentrate with a biomass-coal mixed reducing agent, a nanoscale additive and the like, reducing in a rotary kiln under a temperature-controlled and oxygen-controlled atmosphere, quenching and cooling a product by water, and performing multi-stage ore grinding magnetic separation to obtain metal iron particles and a titanium-rich material; and preparing the two into a ferrotitanium powder product. The process integrates innovative units of raw material homogenization pretreatment, biomass-coal mixed reducing agent dynamic proportioning, LIBS + Raman spectrum on-line monitoring closed-loop control, nano CaO-Na2O composite catalyst buffer addition, finished product multistage magnetic separation reforming and the like. The product composition fluctuation is obviously reduced, the TiO2 content fluctuation is controlled within + / -0.4%, the FeO content fluctuation is controlled within + / -0.5%, the metallization ratio is improved to 90% or above, the heat efficiency is improved by about 20%, and the energy consumption per unit yield is reduced by about 15%. The ilmenite is directly, efficiently and cleanly utilized, a high-quality titanium-rich raw material can be provided for production of titanium dioxide, titanium sponge and the like, meanwhile, the byproduct high-grade iron powder is used for steelmaking, and the comprehensive utilization benefit of resources is remarkable.

The application belongs to the technical field of metallurgy, and discloses a high-purity raw material low-carbon silicon-manganese alloy precise smelting method. The method adds 0.1%-0.3% of nano CaO-Al2O3 composite catalyst in electrolytic manganese, silica and semi-coke raw materials, and then smelts in stages in an inert atmosphere ore-heating electric furnace after mixing and briquetting; the catalyst forms CaAl2O4 active phase at 1550-1650 DEG C, selectively adsorbs and activates SiO2, and reduces the reduction activation energy of SiO2 by 46.4%, while Fe2O3 is inhibited from reduction due to difficult adsorption. The application breaks through the inherent constraints of thermodynamics and kinetics in traditional silicon-manganese alloy smelting by constructing a nano catalyst-selective reduction technology paradigm, significantly reduces energy consumption and carbon emissions, and simultaneously realizes the multiple goals of low carbonization, high purification and greenization without sacrificing production efficiency.

This invention discloses a composite catalyst, its preparation method, and its application in sludge treatment, belonging to the field of sludge treatment and environmental protection technology. The invention synthesizes an iron-carbon nanocomposite catalyst using ferric nitrate nonahydrate, antibiotic bacterial residue, and melamine as precursors. The resulting catalyst can, on the one hand, activate ammonium persulfate to generate free radicals that disrupt the water-locking structure of the sludge, enhancing its hydrophobicity and thus improving dewatering efficiency. On the other hand, the Fe species in the composite catalyst activates ammonium persulfate to form Fe... 3+ Fe 3+ The hydrolysis generates ferric hydroxide colloids that can adsorb sludge particles, neutralize surface charges, thereby reducing interparticle repulsion, promoting floc aggregation, and enhancing dewatering efficiency. The advanced oxidation process of ammonium persulfate catalyzed by iron-carbon nanocomposite catalysts also achieves the removal of antibiotic resistance genes from sludge.

A method of absorption includes contacting a copper hydroxide nitrate / calcium silicate / graphite-phase carbon nitride [Cu2(OH)3NO3 / CaSiO3@g-C3N4] nanocomposite catalyst with a solution including one or more pollutants. Further, the method includes absorbing the one or more pollutants on the Cu2(OH)3NO3 / CaSiO3@g-C3N4 nanocomposite catalyst.

A method of producing hydrogen gas comprising hydrolyzing sodium borohydride (NaBH4) with water at a temperature of from about 20° C. to about 75° C. in the presence of a particulate crystalline nanocomposite catalyst, where the ratio by weight of NaBH4 to the particulate crystalline nanocomposite catalyst is from about 1:1 to about 5:1. The particulate crystalline nanocomposite catalyst comprises a calcium hydrogen phosphate (CaHPO4) crystalline phase, a calcium silicate hydroxide [Ca6Si6O17(OH)2] crystalline phase, a silicon oxide (SiO2) crystalline phase, graphitic carbon nitride (C3N4) crystalline phase, wherein at least a fraction of the graphitic-C3N4 is in the form of mesoporous nanosheets.

A method of producing hydrogen gas comprising: hydrolyzing sodium borohydride (NaBH4) with water at a temperature of from 20 to 75° C. in the presence of a nanocomposite catalyst. The method is characterized in that the ratio by weight of sodium borohydride to the nanocomposite catalyst is from 1:1 to 5:1. Further, the nanocomposite catalyst comprises graphite sheet particles on which are disposed nanorods of δ-MnO2 and nanoparticles of MgO.

The invention relates to the technical field of rubber and plastic material auxiliaries, in particular to an environment-friendly rubber and plastic deodorant with double deodorization functions and a preparation method thereof.The environment-friendly rubber and plastic deodorant is prepared from, by weight, 30-50 parts of a modified natural mineral carrier, 5-15 parts of a nano-composite catalyst, 3-8 parts of an environment-friendly dispersing agent, 2-5 parts of a natural stabilizer and 20-40 parts of deionized water; according to the environment-friendly rubber and plastic deodorant with the double deodorization functions, a modified natural mineral carrier serves as a physical adsorption core, a nano composite catalyst serves as a chemical degradation core, a synergistic deodorization mechanism of adsorption locking and degradation elimination is achieved, and the deodorization efficiency and the long-term effect are remarkably improved; meanwhile, a full-environment-friendly raw material system is adopted, so that the deodorant is non-toxic, harmless and free of secondary pollution, and meets strict environmental protection standards at home and abroad.

The invention provides a microwave-assisted magnetic catalyst plastic dechlorination method, which comprises: placing plastic in a reactor containing a magnetic nano composite catalyst, carrying out an irradiation reaction by using microwaves, continuously adsorbing a plastic melt generated after the irradiation by using a composite adsorption bed, recycling hydrogen chloride gas generated by the irradiation reaction; according to the method provided by the invention, the dechlorination efficiency is 85%-90% of that of a traditional method, the dechlorination efficiency can reach 98% or above, and the treatment time is shortened to 15-30 min; the comprehensive energy consumption is not higher than 0.8 kWh / kg of waste plastics, 0.2-0.5 ton of hydrochloric acid (with the concentration of 30%-35%) is co-produced by per ton of waste plastics, the economic benefit is increased by 200-500 yuan / ton, solid waste is reduced by 90% by recycling the catalyst, and the method has a good application prospect.

The invention provides a method for producing ferrotitanium powder by reducing ilmenite. The method comprises the following steps: carrying out homogenization pretreatment on raw materials; dynamically proportioning a biomass-coal mixed reducing agent; multi-source online spectrum monitoring closed-loop feedback control is carried out; adding a nano CaO-Na2O composite catalyst in a buffer manner; and performing multi-stage magnetic separation reforming on the finished product. The method has the beneficial effects that through the synergistic effect of various innovative units, the fluctuation of raw materials and reducing atmosphere is reduced through pretreatment homogenization and dynamic proportioning, the real-time optimum reaction in the furnace is guaranteed through spectrum monitoring closed-loop control, the reaction rate is increased through the nano-catalyst, iron particle formation and magnetic separation reforming are fully separated, and products are utilized. According to the process, the direct reduction process of the ilmenite is precisely regulated and controlled, the content of TiO2 in the produced titanium-rich material is stabilized at 90-92%, the FeO residue is lower than 2%, the total recovery rate of metallic iron reaches 90% or above, and the energy consumption of unit output is reduced by about 15% compared with that of a traditional process. The process provides a new way for clean and efficient utilization of titanium resources.

A method of producing hydrogen comprising hydrolyzing sodium borohydride (NaBH4) with water at a temperature of from about 20 to about 75° C. in the presence of a particulate crystalline nanocomposite catalyst, wherein the ratio by weight of sodium borohydride to the particulate crystalline nanocomposite catalyst is from about 1:1 to about 5:1. The particulate crystalline nanocomposite catalyst comprises: a monoclinic Bi2O3 crystalline phase; a CaSiO3 crystalline phase; and, a graphitic-C3N4 crystalline phase, wherein at least a fraction of the graphitic-C3N4 is in the form of mesoporous nanosheets.

The invention belongs to the technical field of nano material preparation, and provides a preparation method of a biomass-derived molybdenum carbide-based electrochemical hydrogen evolution catalyst. Specifically, biomass Chinese yam with a wide source is used as a carbon and nitrogen source, a molybdenum-based precursor is obtained through simple impurity removal, airing, grinding and hydrothermal reaction with ammonium molybdate, then the precursor is roasted in an inert atmosphere, and the biomass nitrogen-doped carbon-molybdenum carbide nano composite catalyst is prepared by adjusting the carbonization temperature and the carbon-molybdenum ratio of reaction raw materials. The molybdate and the common biomass Chinese yam are adopted as raw materials, the source is wide, the price is low, the preparation method is simple and safe, and the controllability of the preparation process is high. In the prepared composite material, molybdenum carbide particles are good in dispersity on biomass carbon, and the composite material has good electrochemical activity and stability when being applied to an electro-catalysis water desorption hydrogen desorption reaction.

This invention provides a Ni-molybdenum oxide / Nb₂O₅ nanocomposite catalyst, its preparation method, and its application, belonging to the field of catalyst technology. The invention first prepares a catalyst precursor using an excess impregnation method, and then prepares the Ni-molybdenum oxide / Nb₂O₅ nanocomposite catalyst using a hydrogen reduction treatment method. This catalyst exhibits uniform loading of active components and excellent self-hydrothermal catalytic performance. The Ni-molybdenum oxide / Nb₂O₅ nanocomposite catalyst prepared by this invention can minimize the C-O bond dissociation energy, promote C-O bond breaking, and enable the reaction to proceed in the forward direction, achieving a high-value conversion of guaiacol to catechol under mild reaction conditions without exogenous hydrogen.

A method for photothermal synthesis gas production. The method comprises feeding methane and carbon dioxide into a photothermal reactor, the photothermal reactor comprising a catalyst. The catalyst comprises a metal organic framework (MOF) derived nanocomposite oxide catalyst, the MOF derived nanocomposite oxide catalyst being grown on titanium dioxide (TiO2) quantum dots.

The invention belongs to the technical field of metallurgy, and discloses an accurate smelting method for a high-purity raw material low-carbon silicon-manganese alloy. The method comprises the following steps: adding 0.1%-0.3% of a nano CaO-Al2O3 composite catalyst into electrolytic manganese, silica and semi-coke raw materials, mixing and briquetting, and performing staged smelting in an inert atmosphere ore-smelting electric furnace; the catalyst forms a CaAl2O4 active phase at 1550-1650 DEG C, and selectively adsorbs and activates SiO2, so that the reduction activation energy is reduced by 46.4%, and the reduction of Fe2O3 is inhibited due to difficult adsorption. According to the method, by constructing a nano catalyst-selective reduction technology normal form, the inherent constraints of thermodynamics and dynamics in traditional silicon-manganese alloy smelting are broken through, energy consumption and carbon emission are remarkably reduced, and multiple targets of low carbonization, high purification and greenization are synchronously achieved on the premise that the production efficiency is not sacrificed.

The invention discloses a composite catalyst as well as a preparation method and application thereof in sludge treatment, and belongs to the technical field of sludge treatment and environmental protection. The iron-carbon nano composite catalyst is synthesized by taking iron nitrate nonahydrate, antibiotic mushroom dregs and melamine as precursors. On one hand, the obtained catalyst can activate ammonium persulfate to generate free radicals to destroy the water locking structure of sludge, enhance the hydrophobicity of the sludge and further enhance the dewatering effect, on the other hand, Fe species in the composite catalyst activate ammonium persulfate to form Fe < 3 + >, and Fe < 3 + > is hydrolyzed to generate ferric hydroxide colloid which can adsorb sludge particles and neutralize surface charges, so that the dewatering effect is improved. Therefore, repulsive force among particles is reduced, floc aggregation is promoted, and the dehydration effect is enhanced. And the advanced oxidation process of catalyzing ammonium persulfate by the iron-carbon nano composite catalyst also realizes removal of antibiotic resistance genes in the sludge.

The invention relates to the technical field of nano composite catalyst preparation, in particular to a nano catalyst and a preparation method and application thereof. The invention relates to a nano catalyst, which is a Fe-Si-B-based alloy doped with transition metal, and the chemical general formula of the nano catalyst is Fe < 75-x > M < x > Si < 12.5 > B < 12.5 >, x is 2 to 10; wherein M is selected from transition metal Co or Ni. According to the nano catalyst prepared by the preparation method disclosed by the invention, the problems that the electrocatalytic activity and the stability of NS-Fe75Si12.5 B12.5 are relatively low are solved. In addition, the preparation method is simple in process, high in repeatability and free of dependence on a foamed nickel substrate, and the nano-catalyst is excellent in self-supporting performance and suitable for large-scale production.

The invention relates to a method for preparing beta-phenethyl alcohol from styrene through chemical-enzymatic coupling catalysis. In the method, the beta-phenethyl alcohol can be prepared from styrene by a one-pot method by using the MgO-CNT nanocomposite catalyst prepared by the method and the immobilized enzyme. The method has the characteristics of high efficiency, simplicity and low cost, and is suitable for industrial production of beta-phenethyl alcohol.

The present application relates to the technical field of nanocomposite catalyst preparation, and particularly relates to a kind of nanometer catalyst and its preparation method and application.A kind of nanometer catalyst, the nanometer catalyst is Fe-Si-B base alloy doped with transition metal, its general chemical formula is Fe 75‑ x M x Si 12.5 B 12.5 ;x is 2-10;Wherein, M is selected from transition metal Co or Ni.The nanometer catalyst prepared by the preparation method of the present application overcomes the problem of low electrocatalytic activity and stability of NS-Fe 75 Si 12.5 B 12.5 In addition, the preparation method of the present application is simple, and the repeatability is high, without relying on nickel foam substrate, and the nanometer catalyst is self-supporting, and is suitable for large-scale production.

The application discloses a high-efficiency recyclable amino black phosphorus / carbon dot / covalent organic framework ternary composite catalyst and a preparation method and application thereof, and belongs to the technical field of catalysts. The carbon dot is used as a reinforcing body, is loaded through a covalent organic framework, is mixed with amino black phosphorus nanosheets through a mechanical mixing electrostatic adsorption mode, and after a heterostructure is constructed, a nanocomposite catalyst with excellent photocatalytic effect can be prepared, and the nanocomposite catalyst is used as a photocatalyst. The composite catalyst is economic and environment-friendly, has excellent chemical stability and high-efficiency photodegradation performance, and is suitable for the field of photocatalysis.

A method of producing hydrogen gas by hydrolyzing sodium borohydride (NaBH4) with water at a temperature of about 20 to 75° C. in the presence of a particulate crystalline nanocomposite catalyst, wherein the ratio by weight of NaBH4 to the particulate crystalline nanocomposite catalyst is from about 1:1 to about 5:1. The particulate crystalline nanocomposite catalyst comprises: a hexagonal lanthanum hydroxide (La(OH)3) crystalline phase; a lanthanum oxide (La2O3) crystalline phase; a monoclinic calcium silicate (CaSiO3) crystalline phase; and, a graphitic carbon nitride (g-C3N4) crystalline phase, wherein at least a fraction of the g-C3N4 is in the form of mesoporous nanosheets.

The application provides a preparation method of a nanocomposite catalyst, comprising the following steps: preparing a Cu-BTC carrier by a solvothermal method; anchoring Pd species in the carrier channel under an acid condition by using a sol immobilization method to obtain a Pd / Cu-BTC precursor; and placing the Pd / Cu-BTC precursor in an aqueous solution containing 4-nitrophenol and sodium borohydride to react, so that the Pd / Cu-BTC precursor is in-situ converted into a high-performance PdCu-Cu2O nanocomposite catalyst in an aqueous solution at normal temperature. The sol immobilization process is adopted to accurately anchor the palladium species in the regular channel of the Cu-BTC carrier, fundamentally overcoming the technical contradiction that the high dispersion and the structural integrity of the traditional impregnation method are difficult to be compatible, realizing the high dispersion of the active site and the integrity of the carrier structure, and effectively reducing the 4-nitrophenol into 4-aminophenol, and the nanocomposite catalyst has excellent catalytic performance in pollutant degradation and resource utilization.

The present invention provides a nanocomposite catalyst, and the preparation process of the nanocomposite catalyst is as follows: first, peroxidase nanomimetic enzyme is subjected to aldehyde modification to obtain CHO-nanozyme, and then the CHO-nanozyme is coupled with a protease and a ketoamine oxidase to obtain a nanocomposite catalyst. The present invention also provides a one-step method for determining glycated albumin, comprising the following steps: adding the aforementioned nanocomposite catalyst to a glycated albumin test solution, then adding a TMB solution to react for a period of time, observing the results, and the color of the solution after the reaction turns blue, indicating the presence of glycated albumin, and the blue color deepens as the concentration of glycated albumin in the glycated albumin test solution increases. The present invention uses a composite catalyst that integrates the triple functions of protease, ketoamine oxidase, and peroxidase, and detects glycated albumin in a one-step cascade reaction, which can simplify the operation and improve the detection efficiency and accuracy.