611 results about "Ammonium molybdate" patented technology

The invention provides a preparation method of a shape-controllable iron-molybdenum formaldehyde catalyst, and belongs to the technical field of catalyst preparation. The preparation method of the catalyst comprises the following steps: firstly, respectively mixing ammonium heptamolybdate tetrahydrate, ferric nitrate nonahydrate and a complexing agent, and dissolving in water to prepare a molybdenum-containing solution and an iron-containing solution; then mixing the molybdenum-containing solution and the iron-containing solution, adjusting the pH value, carrying out vacuum rotary evaporation to form sol, finally drying the sol to form xerogel, and roasting the xerogel to obtain a catalyst finished product. The coordination environment of Mo and Fe in the precursor solution is regulated and controlled through the complexing agent, uneven distribution of components is prevented, the uniform precursor solution is formed, the morphology and particle size of the catalyst are influenced by adjusting the pH of the solution and changing the precipitation rate of the precursor and the growth process of particles, and the catalyst with different morphologies and excellent comprehensive performance is prepared.

The invention discloses a special organic-inorganic compound fertilizer for improving the yield and quality of rice in a rice field, and belongs to the technical field of agricultural fertilizers. The compound fertilizer comprises a three-layer structure consisting of a porous core layer, a quick release coating layer and a biodegradable film, wherein the porous core layer is prepared from ammonium polyphosphate, potassium humate, nano charcoal modified chicken manure, mineral source potassium fulvate and sodium carboxymethyl cellulose-bentonite composite colloid; the quick-release coating layer is prepared from sulfur-resin double-layer coated urea, amino acid chelated zinc, alginic acid complex boron, silica sol, ammonium molybdate, 5-aminolevulinic acid and nano cerium oxide; the biodegradable film is prepared from a film forming solution and a bioactive microbial agent. Through the design of a three-layer structure and the combination of an organic-inorganic-microorganism synergistic technology, accurate matching of nutrient release and a rice fertilizer requirement rule is achieved, meanwhile, soil health and environmental protection are considered, and an innovative solution is provided for green high-yield rice planting.

The invention discloses a monatomic-cluster double-active-site efficient ammonia cracking hydrogen production catalyst and a preparation method thereof, and belongs to the field of new energy catalytic materials. The catalyst comprises a 2-methylimidazole zinc derived nitrogen-doped carbon-loaded cobalt monatomic carrier, a molybdenum disulfide nanosheet-loaded iron cluster carrier, monatomic active metal, cluster active metal and an auxiliary agent. Wherein the 2-methylimidazole zinc derived nitrogen-doped carbon-loaded cobalt monatomic carrier is prepared by the following steps: stirring 2-methylimidazole, zinc acetate and cobalt nitrate hexahydrate in methanol to generate a ZIF-8 precursor, washing, drying, and calcining in an H2 / Ar mixed atmosphere, thereby obtaining the 2-methylimidazole zinc derived nitrogen-doped carbon-loaded cobalt monatomic carrier; the molybdenum disulfide nanosheet loaded iron cluster carrier is prepared by carrying out hydrothermal reaction on ammonium molybdate and thiourea to generate MoS2 nanosheets and then loading iron clusters. The catalyst prepared by the invention has high activity, long service life and industrial applicability.

The embodiment of the invention relates to the photovoltaic field, and provides a cyanide-free electroplating silver-coated copper conductive material, a preparation method thereof and a crystalline silicon solar cell. The silver-coated copper electrode provided by the embodiment of the invention comprises a copper core and a copper-tin alloy electroplated layer coated on the surface of the copper core, the surface of the pre-plating material is coated with the silver electroplating layer; the surface of the silver-coated copper material is coated with the self-repairing layer; wherein the self-repairing layer comprises a resin film and a pH response type microcapsule, the microcapsule is embedded in the resin film, and the microcapsule is filled with an ammonium molybdate corrosion inhibitor. The copper-silver interface bonding force can be improved through the copper-tin alloy electroplated layer, and the silver layer material does not contain cyanogen and is environmentally friendly; the corrosion inhibitor in the pH response type microcapsule in the self-repairing film layer on the surface of the silver layer is released under a specific pH condition to form a protection film on the silver layer again, so that the self-repairing purpose is achieved, and the dynamic protection effect is achieved.

The invention discloses a method for recovering Mo and Fe from direct coal liquefaction oil residues, and belongs to the technical field of hydrometallurgy. The method comprises the steps of solvent extraction, roasting enrichment, wet leaching, extracting agent extraction, ammonia water reverse extraction and evaporative crystallization, and ammonium molybdate and Fe (OH) 3 are obtained. Wherein in the wet leaching process, a leaching aid and sulfuric acid are jointly used for leaching, so that Ca and Si in the oil residues are left in leaching residues, and Mo, Fe, Al and the like enter a solution. The method comprises the following steps: simultaneously extracting Mo and Fe from a solution by using an extracting agent, precipitating Fe in a Fe (OH) 3 state by using an ammonia water reverse extraction method, leaving Mo in a reverse extraction solution in the form of ammonium molybdate, and further evaporating and crystallizing the reverse extraction solution to obtain the ammonium molybdate. According to the method, two valuable metals Mo and Fe in the direct coal liquefaction oil residue can be effectively recovered, and resource recycling is facilitated.

This invention discloses a method for the efficient treatment and recovery of copper and molybdenum from high-copper-molybdenum concentrate. The method involves pre-treating low-grade high-copper-molybdenum concentrate with oxygen-pressure water leaching to remove copper. The resulting low-copper-molybdenum concentrate is then processed through oxidative roasting, alkaline leaching, extraction, and evaporation crystallization to prepare ammonium molybdate. The copper-removing solution is then subjected to synergistic extraction and stepwise back-extraction to recover copper and molybdenum. This method not only achieves efficient removal of copper from the high-copper-molybdenum concentrate, avoiding the impact of copper on molybdenum recovery and ammonium molybdate preparation, but also innovatively employs a synergistic extraction and stepwise back-extraction method to separately enrich and recover copper and molybdenum. Matching this with an electrowinning process achieves high-value copper recovery. Simultaneously, the acidic copper extraction residue and the alkaline molybdenum extraction residue are synergistically neutralized, saving reagent costs.

The invention relates to a preparation method of a niobium pentoxide loaded molybdenum disulfide catalyst and application of the niobium pentoxide loaded molybdenum disulfide catalyst in lignin conversion. The preparation method comprises the following steps: dissolving ammonium molybdate heptahydrate and thiourea in distilled water, adding Nb2O5, and adjusting the pH value of the mixture to 0.8-1.1 by using hydrochloric acid; transferring the solution into a stainless steel autoclave for hydrothermal reaction; centrifugally separating to obtain a black precipitate, washing with water and absolute ethyl alcohol, and drying in vacuum overnight; and placing the obtained substance in a high-temperature and high-pressure reaction kettle, screwing the reaction kettle to seal the reaction kettle, discharging gas after introducing H2, discharging air in the device, pressurizing to 3-5 MPa, and reacting to obtain the catalyst Nb2O5-MoS2. The catalyst shows excellent activity of aromatic phenol and ether compound hydrodeoxygenation for aromatic hydrocarbon preparation. The invention provides the catalyst which is low in cost, simple and convenient to prepare and excellent in performance, after ten cycle experiments, the activity of the catalyst is still stable, and the indexes of the conversion rate and the yield are reduced by less than 5%.

The invention discloses a special organic fertilizer for soybeans and a preparation method thereof, and belongs to the technical field of organic fertilizers. The special organic fertilizer for soybeans is prepared from the following raw materials in parts by weight: 8-10 parts of fish protein modified charcoal, 40-50 parts of decomposed soybean meal, 20-25 parts of decomposed livestock and poultry manure, 15-20 parts of humic acid, 10-15 parts of plant ash, 3-5 parts of a seaweed extract and 0.1-0.3 part of ammonium molybdate. According to the organic fertilizer, the soybean meal fermented by the trichoderma reesei and the aspergillus awamori and the fish protein modified biochar are added, the two components are compounded with the cooked livestock and poultry manure, the humic acid, the plant ash, the seaweed extract and the ammonium molybdate to form the organic fertilizer, the nitrogen fixation capacity of the soybeans is effectively improved through the synergistic effect of various substances, and the growth and development of the soybeans are remarkably promoted; the soybean yield and quality are improved. In addition, the whole organic fertilizer preparation process is free of strong acid and strong alkali treatment, the environmental pollution risk is reduced, and the standard of organic agriculture is met.

The invention provides a method for short-process all-component echelon recovery of a waste hydrogenation catalyst, and relates to the field of solid waste treatment. The recovery method of the waste hydrogenation catalyst comprises the following steps: roasting the waste hydrogenation catalyst and sodium carbonate to obtain a roasted product; the roasted product is leached with water, and leaching liquid and leaching residues are obtained; extracting the leaching solution by using an extracting agent to obtain a vanadium-molybdenum-containing organic phase, sequentially carrying out reverse extraction treatment on the vanadium-molybdenum-containing organic phase by using a strong alkaline reverse extraction agent and a weak alkaline reverse extraction agent to obtain a vanadium reverse extraction solution and a molybdenum reverse extraction solution, and carrying out vanadium precipitation treatment on the vanadium reverse extraction solution to obtain ammonium metavanadate; acidizing the molybdenum strip liquor to precipitate molybdenum to obtain ammonium molybdate; carrying out sintering treatment on the leaching residues and alkaline substances, leaching obtained calcine with water to obtain water leaching residues and filtrate, and carrying out aluminum precipitation treatment on the filtrate to obtain aluminum hydroxide, aluminum oxide or pseudo-boehmite; and reducing and smelting the water leaching residues to obtain the ferro-nickel alloy. According to the invention, multi-element comprehensive recovery of all components of vanadium, molybdenum, nickel, aluminum and sulfur can be realized, and high-value utilization of all components of the waste hydrogenation catalyst is realized.

The invention discloses a preparation method and application of a TiO2 / Ag-coated MoS2 composite photocatalyst, and relates to the technical field of catalysts.The method comprises the steps that titanium dioxide is evenly dispersed in an ethanol-water mixed solution to form turbid liquid; adding a silver nitrate solution and carrying out ultraviolet irradiation to carry out a photodeposition process; adding an ammonium tetrathiomolybdate precursor solution into the turbid liquid, carrying out ultraviolet irradiation, inducing MoS < 2-> to be subjected to an auto-oxidation reduction reaction through an electronic effect, generating an amorphous MoS2 shell on the surface of silver, and forming a core-shell Ag-coated MoS2 cocatalyst; and centrifuging, washing and drying to obtain the TiO2 / Ag-coated MoS2 composite photocatalyst. According to the Ag-coated MoS2 cocatalyst, the electron density of S atoms is higher, the strength of S (2 + delta)-Had bonds is weakened, and Had is more easily desorbed to form hydrogen; and the photocatalyst also has better light absorption and photo-generated charge separation efficiency, so that the photocatalyst shows better photocatalytic hydrogen evolution activity and stability.

The application relates to the field of fireproof bricks, and discloses a baking-free fireproof brick and a preparation method thereof. The baking-free fireproof brick comprises iron tailings, cement, fly ash, a functional additive, fine aggregate, quartz sand, a chromium aluminum phosphate binder, a water reducing agent and water. The functional additive is prepared by using aluminum chloride hexahydrate and alkaline silica sol as raw materials, ammonium molybdate tetrahydrate as a catalyst, growing mullite whiskers on the surface of silicon carbide fibers through vacuum impregnation and heat treatment, modifying the prepared composite silicon carbide fibers through 3-(methacryloxy) propyl trimethoxysilane, and then copolymerizing the modified composite silicon carbide fibers with acrylic acid and 4-hydroxybutyl vinyl ether. The chromium aluminum phosphate binder is prepared by using aluminum hydroxide, phosphoric acid and chromium trioxide as raw materials and calcium hydroxide as a curing agent. The baking-free fireproof brick prepared through the synergistic effect of the components has high compressive strength and bending strength, small water absorption and good baking-free fireproof and heat insulation performance.

The invention relates to the technical field of production and preparation of ammonium tetramolybdate, and particularly discloses a preparation method for producing high-purity ammonium tetramolybdate from low-grade molybdenite. The preparation method for producing the high-purity ammonium tetramolybdate from the low-grade molybdenite comprises the following steps: S1, pretreating the low-grade molybdenite to obtain slag, and roasting the slag to obtain roasted slag; s2, the roasted slag and an ammonia water solution are mixed and leached, and a leaching solution is obtained; s3, an impurity removal agent and an adsorbent are added into the leachate for adsorption and purification, the impurity removal agent comprises mercaptoacetic acid and disodium ethylene diamine tetraacetate, the adsorbent is modified calcium alginate, and after purified liquid passes through an anion exchange resin column, an ammonium molybdate solution is obtained; and S4, adding a nitric acid solution into the ammonium molybdate solution, adjusting the pH value, and then crystallizing to obtain high-purity ammonium tetramolybdate. According to the preparation method, the purity of the ammonium molybdate solution is effectively improved through three procedures, and then the purity of ammonium tetramolybdate prepared from low-grade molybdenite is effectively improved.

The invention relates to the technical field of catalysts, in particular to a graphene-based desulfurization catalyst and a preparation method thereof. Graphene oxide is used as a carrier, an initiating group is introduced firstly, a short-brush amphoteric polymer gradient modification layer and a long-brush amphoteric polymer gradient modification layer are sequentially constructed through atom transfer radical polymerization, ammonium molybdate-urea complex deposition is fused, and uniform nucleation of a metal precursor is achieved. Two-stage vulcanization is adopted in the preparation process, the crystallization process of a precursor is controlled step by step at different temperatures, and the size and dispersity of a molybdenum disulfide sheet layer are optimized. The catalyst is high in conversion rate under a hydrodesulfurization model system, low in total sulfur of discharged materials, and excellent in activity retention rate after multiple cycles. The method can be widely applied to the field of fuel oil deep desulfurization, and the efficient and environment-friendly industrial catalysis requirement is met.

The invention discloses a bio-oil enhanced hydrodenitrogenation method, which comprises the following steps: adding bio-oil, a catalyst, formic acid and deionized water into a reaction kettle, uniformly stirring to obtain a mixed solution, continuously stirring for reaction, and after the reaction is finished, carrying out suction filtration and distillation to obtain reformed bio-oil. The preparation method of the catalyst comprises the following steps: mixing corn straw and ammonium molybdate, adding deionized water after mixing, stirring and dipping, and then carrying out vacuum drying and calcining to obtain the catalyst. In the catalytic reforming process, formic acid is innovatively introduced to serve as a hydrogen source, the gas-liquid interface transmission resistance of a traditional gaseous hydrogen source is eliminated through the homogeneous hydrogen supply characteristic of liquid formic acid, the flammable and explosive risk of high-pressure hydrogen is avoided, the process safety is improved, meanwhile, formic acid is subjected to in-situ decomposition on the surface of the catalyst to generate active hydrogen species, and the catalytic reforming efficiency is improved. And a synergistic catalysis mechanism is formed with a platinum-like active site of the catalyst, so that the kinetic advantage of the hydrodenitrification reaction is enhanced, and an efficient, safe and environment-friendly bio-oil hydrodenitrification process system is constructed.

The invention belongs to the technical field of photocatalysis and environmental governance, and particularly relates to a composite photocatalyst, in particular to a graphite-phase carbon nitride / molybdenum trioxide composite photocatalyst as well as a preparation method and application thereof. The method comprises the following steps: S1, dispersing ammonium heptamolybdate in deionized water, adjusting the pH value of the solution to 0.5 + / -0.3 by using sulfuric acid, stirring and centrifuging the formed system, and carrying out vacuum drying to obtain a molybdic acid precursor; s2, mixing melamine and the molybdic acid precursor, calcining the formed mixture, and naturally cooling to room temperature after calcining is finished, so as to obtain the composite photocatalyst. Tests prove that the prepared catalyst has excellent cycling stability, still keeps high catalytic activity after being recycled for multiple times, and has a good industrial application prospect.

The invention discloses a method for recycling process water in an APT (ammonium paratungstate) production process, and relates to the field of water recovery in an APT production process, and the method comprises the following steps: S1, recycling wastewater of an alkali extraction system; s2, evaporating strip liquor and recovering ammonia water; s3, chemical treatment of pure ammonium tungstate evaporation ammonia water; s4, ammonium molybdate evaporation ammonia water closed-loop utilization; and S5, recycling ammonia gas in a crystallization section. According to the method, the recovery rate of tungsten and molybdenum in the tail liquid is remarkably increased by optimizing the processes of wastewater reuse of the alkali extraction system, strip liquor evaporation, ammonia water recovery and the like; one part of the tail liquid is recycled in the pulping process, the other part of the tail liquid is subjected to evaporation treatment, zero emission of wastewater is achieved, evaporated condensate water can be recycled to be used for preparing a stripping agent, the utilization rate of water resources is further increased, the production cost is reduced, and meanwhile the environment-friendly requirement is met.

The invention provides a hot-melt epoxy resin composition, a prepreg, a fiber reinforced composite material and a preparation method, the hot-melt epoxy resin composition comprises 60-70 parts of liquid epoxy resin, 30-40 parts of solid epoxy resin, 10-20 parts of a flame retardant, 5-15 parts of a flexibilizer, 5-15 parts of a curing agent, and 0.5-1.5 parts of an impregnating compound; the prepreg comprises the following components in parts by weight: 30-45 parts of a hot-melt epoxy resin composition and 55-70 parts of a reinforcing material, the fiber-reinforced composite material is obtained by laminating prepregs in a predetermined form and pressing / heating to cure the resin. The carboxyl-terminated nitrile rubber and the polyethersulfone are mixed for toughening, so that the viscosity of a resin matrix in the curing process is effectively ensured while toughening is performed, serious gummosis of the resin matrix is prevented, and the anti-stripping strength of the composite material is improved; the flame retardant and smoke suppression performance of the composite material can meet the requirements of 60s vertical combustion, 30s 45-degree combustion and smoke density test of an aviation system, so that the system realizes halogen-free flame retardance, and the application range of the material is wider.

The invention relates to a synergistic biological prevention and control double-effect regulation compound fertilizer applicable to corn and a preparation method, and the synergistic biological prevention and control double-effect regulation compound fertilizer applicable to corn is prepared from the following raw materials in parts by mass: 15-20 parts of urea, 10-15 parts of controlled-release nitrogen fertilizer, 8-12 parts of monoammonium phosphate, 5-8 parts of calcium magnesium phosphate fertilizer, 10-15 parts of potassium sulfate, 1-2 parts of zinc sulfate, 0.5-1 part of boric acid and 0.2-0.5 part of ammonium molybdate. According to the invention, through the synergistic effect of the microbial agent and the Chinese herbal medicine extract, the effect of biological prevention and control is achieved, the use of chemical pesticides is reduced, and the risk of pesticide residues in corn is reduced.

The application discloses a biomass-based nitrogen-doped carbon-carbide molybdenum composite catalyst and a preparation method and application thereof, and is characterized in that: a widely-sourced biomass, especially agricultural biomass waste, is used as a carbon and nitrogen source, ammonium molybdate is used as a molybdenum source, and a nitrogen-doped carbon-carbide molybdenum composite catalyst is prepared through one-step pyrolysis under an ammonia atmosphere; the catalyst is mesoporous nitrogen-doped carbon loaded with pure beta-phase carbide molybdenum, has the characteristics of a large pore size, high dispersion of beta-phase carbide molybdenum and the like, and has good thermal stability; the catalyst can efficiently denitrogenate quinoline and directively convert the quinoline, and high-selectivity aromatic hydrocarbon products can be obtained; the conversion rate is not less than 99%, the denitrogenation rate is not less than 99%, the selectivity of aromatic compounds is not less than 86%, and the catalyst has the characteristics of low hydrogen consumption due to the avoidance of hydrogen saturation reaction.

This application relates to the technical field of waste catalyst recovery, and specifically discloses a method for recovering valuable metals from vanadium-molybdenum-containing waste catalysts. The method includes the following steps: S1: Heating the vanadium-molybdenum-containing waste catalyst for roasting, continuously heating for roasting, and then cooling to obtain a roasted material; S2: Mixing the roasted material with sulfuric acid solution A containing oxalic acid, heating for leaching to obtain leaching solution A and residue A; Mixing residue A with sulfuric acid solution B containing thiourea and ethylenediaminetetraacetic acid, heating for secondary leaching to obtain leaching solution B and residue B, washing residue B with acid solution to obtain a washing solution; Combining the leaching solutions and the washing solution to obtain a combined solution; S3: Adjusting the pH of the combined solution to 2.5 - 3, then adjusting the pH to 4.5 - 5, adding dimethylglyoxime alcohol solution, heating to obtain a purified solution; Mixing the purified solution with an extraction solution evenly to obtain a vanadium-molybdenum-containing organic phase; S4: Back-extraction and product preparation. The ammonium molybdate and vanadium pentoxide obtained in this application have high purity, and the recovery rates of vanadium and molybdenum are relatively high.

The invention relates to the technical field of fertilizers, and discloses a molybdenum-boron synergistic control type macroelement water-soluble fertilizer, which is prepared from the following raw materials in parts by weight: nitrate nitrogen, ammonium nitrogen, ammonium polyphosphate, potassium oxide, chelated magnesium (MgO), trace elements, a stress-resistant enhancer, a synergistic control agent and a stabilizer, the trace elements are composed of ammonium molybdate, a boric acid-glycerol compound, chelated zinc, chelated manganese (Mn-EDTA) and a chelating agent. According to the molybdenum-boron synergistic control type macroelement water-soluble fertilizer and the preparation process thereof, the ammonium molybdate and the boric acid-glycerol compound are added into the fertilizer, so that the nutrient deficiency symptom can be effectively and synergistically prevented, the fungal disease resistance can be effectively improved by adding the salicylic acid and the nano silicon dioxide, and meanwhile, the effect of preventing and treating the macroelement is achieved. By adding the chlamydomonas rubra enzymolysis extract containing natural abscisic acid, potassium silicate and polyaspartic acid, the high temperature resistance, drought resistance and heavy metal pollution resistance of the fertilizer can be effectively improved, so that the effect of the whole water-soluble fertilizer is improved, and the application range of the water-soluble fertilizer can be widened.

This invention relates to a fully automated rapid silicate concentration detection method, comprising: S1, establishing a standard curve based on a silicate standard solution; S2, performing fully automated rapid silicate concentration detection based on the standard curve; S1 includes: S11, preparing the standard solution; S12, performing automatic sample injection and detection; S13, signal acquisition and processing; S14, fitting the standard curve; S15, verifying and storing the standard curve; S16, performing anti-interference verification, including: adding interfering substances to the standard solution to verify the reliability of the curve; S2 includes: S21, performing range calibration using the standard solution before sample measurement, setting the photomultiplier tube's high voltage value to V1 to achieve the standard measurement range; S22, preparing reagent A (2% ammonium molybdate), reagent B (4% dilute sulfuric acid), and reagent C (basic luminescent agent) required for fully automated rapid silicate concentration detection; S23, performing fully automated rapid silicate concentration detection based on the standard curve. A corresponding fully automated rapid silicate detector is also disclosed.

The invention discloses a green process method for extracting alkali metal from composite ore, and relates to the field of metal extraction.The green process method comprises the following steps that S1, aluminosilicate composite ore containing alkali metal and ammonium carbonate are mixed and roasted, and activated clinker is obtained; s2, mixing the activated clinker with an ammonium citrate solution, carrying out a leaching reaction at 80-95 DEG C, and carrying out solid-liquid separation after the reaction to obtain a leaching solution and leaching residues; according to the green process method for extracting the alkali metal from the composite ore, through systematic coupling of a low-temperature ammonium carbonate activation-ammonium citrate complexing leaching-manganese system / ammonium phosphomolybdate specific adsorption-bipolar membrane electrodialysis closed-loop regeneration technology chain, a synergistic interaction effect is formed; the activation step significantly improves the leaching efficiency of the subsequent mild leaching agent.

The present invention belongs to the field of hydrometallurgy technology, and specifically relates to a method for recovering ammonia and nitrogen from ammonium molybdate mother liquor and removing other impurity ions. The method comprises: extracting the ammonium molybdate mother liquor and performing oil separation to produce an ammonia recovery stock solution; neutralizing and filtering the ammonia recovery stock solution to obtain a neutralized filtrate; deeply decalcifying the neutralized filtrate to obtain a decalcified filtrate; steam stripping the decalcified filtrate to recover ammonia; recovering ammonia from the non-condensable gas produced in the overhead condenser after steam stripping and the steam produced during the neutralization process; and heat exchanging the deeply impurity-removed purified liquid produced at the bottom of the steam stripping tower and the oil-separated ammonia recovery stock solution, cooling them, and then transferring them to the production system for reuse. The present invention can effectively recover ammonia and nitrogen resources from the ammonium molybdate mother liquor, deeply remove other impurity ions in the solution, eliminate the blockage effect of CaSO4 scale on pipelines and heat exchangers, improve the Mo leaching rate, and reduce the three-phase product yield and organic phase loss.

The present invention relates to the field of nanomaterial synthesis, and discloses an upconversion luminescent material, a preparation method thereof, and an application thereof. The preparation method of the upconversion luminescent material comprises: (1) first stirring an ytterbium salt solution, an ammonium molybdate tetrahydrate solution, and a rare earth metal salt solution to obtain an intermediate I; the rare earth metal salt in the rare earth metal salt solution is selected from at least one of an erbium salt, a holmium salt, a praseodymium salt, and a europium salt; (2) subjecting the intermediate I to a hydrothermal reaction in a hydrothermal reactor to obtain an intermediate II; and (3) sequentially subjecting the intermediate II to a drying treatment and a calcination treatment to obtain the upconversion luminescent material. The upconversion luminescent material particles prepared by the method of the present invention have an average particle size of nanometer level, a good degree of crystallinity, and good reverse thermal quenching performance.

The invention discloses a nutrition regulating agent for regulating the mature period of citrus fruits and application of the nutrition regulating agent. The nutrition regulating agent is prepared from potassium nitrate, monopotassium phosphate, magnesium sulfate, ferric sodium ethylenediaminetetraacetate, zinc sodium ethylenediaminetetraacetate, boric acid, ammonium molybdate, gibberellin, abscisic acid and diatomite which is supplemented to 100 parts. The invention further provides a preparation method of the nutrition regulating agent and application of the nutrition regulating agent in regulating the mature period of citrus fruits, and the application mode is that when the diameter of the citrus fruits is 40-50 mm, the preparation is diluted by 600-800 times to be sprayed on leaf surfaces, once every 7 days and twice continuously. Through the synergistic effect of mineral nutrient elements and low-concentration hormones, bidirectional precise regulation and control of the citrus mature period are achieved, fruits can be promoted to mature in advance or later for 7-15 days, the sugar-acid ratio and color of the fruits can be remarkably improved, meanwhile, the problems of tree vigor decline and quality decline caused by single hormone treatment are solved, and the method is suitable for large-scale popularization and application. The method has the characteristics of high efficiency, safety and simple operation.

This invention discloses a hydrogenation and upgrading catalyst, its preparation method, and its application, belonging to the field of catalyst technology. The invention first pyrolyzes wheat straw into biochar, then mixes it with KOH and nitrides and calcines it to obtain nitrogen-doped biochar. The nitrogen-doped biochar is then mixed with a solution of cobalt nitrate and ammonium molybdate, dried, and calcined under nitrogen, followed by calcination under hydrogen to obtain a Co-Mo / NBC catalyst with Mo2C and Co3Mo3C as active components and nitrogen-doped activated biochar as the support. Because the nitrogen-doped activated biochar contains pyridine nitrogen as a coordination element for metallic Mo, Mo anchors pyridine nitrogen to form N-Mo, which promotes the dispersion of Mo2C and enhances the interaction between Mo2C and the nitrogen-doped biochar support. Furthermore, the addition of the promoter Co promotes Mo carburization, resulting in more Mo oxides forming Mo2C, and Co transfers electrons to Mo, making Mo electron-rich, significantly improving the hydrogenation activity of the catalyst. The catalyst maintains high desulfurization and denitrification rates even after at least seven reuses without any further treatment.

This application relates to the field of cable materials, specifically disclosing a low-smoke, low-halogen polyvinyl chloride (PVC) cable material and its preparation method. The material includes the following raw materials: polyvinyl chloride resin, EVM500 rubber, heat stabilizer, antioxidant, plasticizer, lubricant, filler, flame retardant, flame retardant synergist, and acrylate processing aids. The flame retardant includes a mixture of aluminum hydroxide and magnesium hydroxide, and the flame retardant synergist includes a zinc borate and ammonium octamolate-sepiolite composite. The preparation method includes the following steps: mixing the raw materials according to a specified ratio, then melting and mixing them, followed by granulation and extrusion molding to obtain the low-smoke, low-halogen PVC cable material. This application alleviates the problem of traditional PVC cable materials producing large amounts of black smoke and toxic gases during combustion, reduces smoke density, and improves the material's environmental performance and flame retardant properties.

This invention discloses a C / MoS2-Co9S8-Co composite electrochemical catalyst, its preparation, and application. This material is synthesized using ammonium tetrathiomolybdate, cellulose, and a metal cobalt salt via a coating-pyrolysis method. The resulting composite material effectively enhances the electrocatalytic activity for oxygen evolution and reduction, making it a highly efficient electrocatalyst for oxygen evolution and reduction reactions.

The invention discloses a titanium dioxide nanorod / dissimilar metal MOFs heterojunction material and a preparation method and application thereof, and belongs to the technical field of photoelectrochemistry seawater hydrogen production. Soluble nickel salt, soluble cadmium salt or soluble cobalt salt and ammonium molybdate are adopted as metal sources, spherical dissimilar metal MOFs grow on the surface of a TiO2 nanorod in situ, and the TiO2 nanorod / dissimilar metal MOFs heterojunction material is prepared. According to the present invention, the oxygen deficiency-regulated dissimilar metal MOFs material (i.e., the titanium dioxide nanorod / dissimilar metal MOFs heterojunction material) is obtained through subsequent acid etching and annealing treatment, the material is subjected to in-situ reconstruction during the OER process to spontaneously form the active hydroxide (NiOOH) of anion protection (MoO4 < 2->), and the excellent stability is represented; only small Faraday efficiency loss (1.2-2.3%) occurs in a high chloride ion environment (3.5 wt%-7wt% of NaCl), and an extensible path is provided for industrial-scale solar hydrogen production by using seawater.