17 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.

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 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 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.

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.

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 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 invention relates to the technical field of catalysts, in particular to a copper-zirconium bimetallic oxide nano-composite catalyst as well as preparation and application thereof. The preparation method comprises the following steps: dissolving a precursor salt of copper and zirconium hydroxide, uniformly mixing, and adding an ammonia water solution to obtain a copper-zirconium precursor solution; and carrying out post-treatment on the copper-zirconium precursor solution, and then carrying out roasting treatment to obtain the copper-zirconium bimetallic oxide nano composite catalyst. The preparation method of the copper-zirconium bimetallic oxide nano-composite catalyst has the advantages that the process is simple, the reaction condition is mild, the prepared copper-zirconium bimetallic oxide nano-composite catalyst is good in copper dispersity, and the product has the advantages of strong adsorption to * CO, high conductivity and the like; when the prepared copper-zirconium double-metal oxide nano composite catalyst is further used for preparing methane through electrocatalysis CO2 reduction, the catalyst can effectively inhibit hydrogen evolution side reaction, is high in stability and has high selectivity and excellent stability on methane.