22results about "Complex cyanides" patented technology

The invention provides a process for removing cyanide from a cyanide-bearing aqueous fluid, the process comprising: (i) adding a solid composition comprising a first mixed-metal cyanide complex comprising copper and iron to a cyanide-bearing aqueous fluid comprising free cyanide and metal-complexed cyanide, wherein at least a portion of the first mixed-metal cyanide complex dissolves, with complexation of the copper by the free cyanide, to produce an aqueous solution comprising cyanometallates, the cyanometallates comprising copper cyanide and iron cyanide complexes derived from the first mixed-metal cyanide complex; (ii) contacting the aqueous solution with an anion-exchange absorbent to absorb the cyanometallates, thereby producing a cyanide-lean aqueous fluid; (iii) extracting the anion-exchange absorbent comprising the absorbed cyanometallates with at least one non-acidic aqueous extractant to produce an aqueous extract comprising the copper cyanide and iron cyanide complexes; and (iv) acidifying the aqueous extract to produce a precipitate comprising a second mixed-metal cyanide complex comprising copper and iron.

The present invention provides a nano-sized metal complex in which volume change on the occasion of temperature change is suppressed. The present invention pertains to a metal complex that has a crystallite diameter of 60 nm or less and is represented by general formula (1).　Formula (1): (M1)p[(M2)q(CN)6•nH2O (in the formula, M1 represents at least one item selected from the group consisting of Ag (I), Au (I), and Cu (I), M2 represents at least one trivalent transition metal, p is a positive number between 2.5 and 3.5 inclusive, q is a positive number between 0.5 and 1.5 inclusive, p + q is a positive number between 3.5 and 4.5 inclusive, and n is 0 or a positive number).

The invention discloses a copper cyanoaurate hexagonal sheet loaded cuprous oxide material as well as a preparation method and application thereof. The copper cyanoaurate hexagonal sheet loaded cuprous oxide material comprises a copper cyanoaurate hexagonal sheet and cuprous oxide loaded on the copper cyanoaurate hexagonal sheet. According to the preparation method, copper ammonium chloride and potassium cyanoaurate are taken as raw materials, a copper cyanoaurate hexagonal sheet is prepared by a hydrothermal method, and then cuprous oxide is loaded on the copper cyanoaurate hexagonal sheet, so that the copper cyanoaurate hexagonal sheet loaded cuprous oxide material is obtained. The invention provides application of the copper cyanoaurate hexagonal sheet loaded cuprous oxide material as a catalyst for electrocatalytic reduction of carbon dioxide, and provides a gas diffusion electrode, and the catalyst in the gas diffusion electrode is the copper cyanoaurate hexagonal sheet loaded cuprous oxide material. The preparation process is simple and environment-friendly; the prepared material has higher ethylene selectivity and stability in the reaction of electrocatalytic reduction of carbon dioxide.

The present invention relates to a particulate composite metal cyanide complex catalyst wherein: the 50% cumulative volume particle diameter of the composite metal cyanide complex catalyst is 0.01-4.0 µm as determined from the volume-based cumulative particle size distribution obtained by a laser diffraction scattering method; and the content of the particles having a particle diameter of 11 µm or more relative to the total volume of the composite metal cyanide complex catalyst is 10 vol% or less.

The invention relates to the technical field of flow batteries, in particular to a Fe-free Prussian blue analogue, a preparation method thereof and a solid energy storage material. The chemical composition of the Fe-free prussian blue analogue is Va [M (CN) b] c, wherein V exists in a form of one or a mixture of more than two of V < 2 + >, V < 3 + >, VO < 2 + > or VO < 2 + >; wherein M is one or two of Co and Ni, when M is a mixture of Co and Ni, the molar ratio of Co to Ni is (3: 1)-(1: 3), and the molar ratio of M to V is (1: 2)-(1: 5); trivalent cobalt is partially reduced, the molar weight ratio of trivalent nickel to divalent nickel is less than or equal to 0.3: 1, and V, M and cyanide ions form a three-dimensional network crystal through coordinate bonds. The Fe-free Prussian blue analogue is prepared from hexacyanocobaltate and / or tetracyanonickelate through a direct coordination method with a vanadium ion salt solution after valence regulation, and the technical problems that an existing solid energy storage material is poor in reversibility, low in voltage efficiency and the like can be solved.

The present invention pertains to a double metal cyanide complex catalyst in a form of particles, wherein a 50% cumulative volume particle diameter determined from a cumulative volumetric particle size distribution obtained by a laser diffraction scattering method in the double metal cyanide complex catalyst is from 0.01 to 4.0 μm, and a content of the particles having a particle diameter of 11 μm or more with respect to the total volume of the double metal cyanide complex catalyst is 10% by volume or less.

The present invention pertains to a double metal cyanide complex catalyst in a form of particles, wherein a 50% cumulative volume particle diameter determined from a cumulative volumetric particle size distribution obtained by a laser diffraction scattering method in the double metal cyanide complex catalyst is from 0.01 to 4.0 µm, and a content of the particles having a particle diameter of 11 µm or more with respect to the total volume of the double metal cyanide complex catalyst is 10% by volume or less.

To provide a method and an apparatus for recovering ammonia in exhaust gas as a solid under more convenient, inexpensive and mild conditions than those under a controlled temperature and pressure.SOLUTION: Ammonia bicarbonate aqueous solution is brought into contact with an ammonia adsorbed PB derivative represented by general formula (1), and after ammonia is desorbed, carbon dioxide is introduced to recover the ammonium carbonate precipitated in the solution as a solid. AxM[M'(CN)6]y.zH2O...(1) [In formula (1), x is 0-3, y is 0.1-1.5, z is 0-6, A is hydrogen, ammonium cation, alkali metal ion, etc., and M, M 'are predetermined cations.]SELECTED DRAWING: Figure 2

The present invention relates to a facile synthetic method to synthesize novel hexagonal phase CuCo (H—CuCo) PBAs with high crystallinity, as well as extended synthesis of doping PBAs with hexagonal phase: Fe0.1—CuCo, Fe0.2—CuCo, Co0.1—CuCo, Ni0.1—CuCo, and Zn0.1—CuCo. The hexagonal phase H—CuCo PBAs and the doping sequence of PBAs with hexagonal phase exhibit superior crystallinity and significantly higher intrinsic specific surface area. Meanwhile, H—CuCo PBAs show great potential for gas adsorption and have a positive impact on the development of PBAs for other applications.

Embodiments of the present application provide a Prussian blue-like transition metal cyanide, a preparation method therefor, and related positive electrode plate, secondary battery, battery pack and device. The Prussian blue-like transition metal cyanide may comprise secondary particles which comprise a plurality of primary particles, wherein the primary particles may have a spherical or spherical-like morphology.

The invention provides an ammonia chemical species desorption process capable of desorbing ammonia chemical species adsorbed onto a Prussian blue derivative more simply at lower cost under milder conditions as compared with the use of an aqueous solution of a salt or strong acid, and more efficiently as compared with the use of only water. This ammonia chemical species desorption process comprises an ammonia chemical desorption step of bringing carbon dioxide and water into contact with a Prussian blue derivative represented by the following general formula (1), thereby desorbing an ammonia chemical species.         AxM[M' (CN) 6]y·zH2O ···     (1) where x is 0 to 3, y is 0.1 to 1.5, z is 0 to 6, A is at least one cation of hydrogen, ammonium, an alkaline metal, and an alkaline earth metal, and M and M' are each independently at least one cation of at least one of atoms having atomic numbers 3 to 83 except for ammonium, an alkali metal, and an alkaline earth metal.

The application discloses a kind of post-processing methods of prussian blue positive material and application, it is related to battery material technical field.The post-processing method of the application mixes water-resistant dispersant solution with mass concentration of 0.1%-5% with prussian blue matrix containing water, and the prussian blue dispersion slurry with solid content of 10%-50% is prepared;The prussian blue positive material is prepared after the slurry is filtered and dried.The post-processing method is less changed to the existing process route, and the input cost is low;It utilizes water-resistant dispersant to modify the surface of prussian blue, significantly reduces the resorption rate and resorption amount of prussian blue to moisture in high dew point environment, while the electrical performance is not affected;The prussian blue positive material prepared has good dispersibility, tap density is improved, which is beneficial to subsequent uniform slurry and prepared high compaction electrode, wide applicability, can be used for preparing positive electrode, secondary battery and electric device.

The invention provides a potassium ion / metal battery high-entropy negative enthalpy Prussian blue analogue positive electrode material and a preparation method thereof, the material also comprises ions of at least five different metal elements in addition to potassium ions, and the preparation method comprises the following steps: synthesizing the material by using a cyanide complex with the chemical formula of Kx [M '(CN) 6], potassium salt and salts of various metals as raw materials and adopting a coprecipitation method. On the basis of the design of the high-entropy component, the disorder of an N coordination environment can be remarkably improved, and then generation of anion defects is inhibited; the high-entropy negative enthalpy structure can significantly enhance the structural stability of the material, and further inhibits complex phase state transition caused by Jahn-Teller lattice distortion, Fouli repulsion, d-pi orbit overlapping and coulomb gravitation change. The regulated electronic structure can eliminate band gaps and reduce potassium ion diffusion barriers, so that the electrochemical dynamic behavior is enhanced; the high element compatibility in the high-entropy component can significantly weaken the accumulation of lattice stress in long-term circulation so as to enhance the electrode stability. Therefore, the prepared series of high-entropy negative-enthalpy electrode materials have high reversible specific capacity, high working voltage and excellent rate capability and cycling stability.

The present invention relates to a simple synthesis method for the synthesis of a novel hexagonal phase CuCo (H-CuCo) Prussian blue analogue (PBA) having a high degree of crystallinity, and to the extended synthesis of the following doped PBA having a hexagonal phase: Fe < 0.1 >-Cu < Co >, Fe < 0.2 >-Cu < Co >, Co < 0.1 >-Cu < Co >, Ni < 0.1 >-Cu < Co >, and Zn < 0.1 >-Cu < Co >. The hexagonal phase H-CuCo PBA and the doped PBA having the hexagonal phase exhibit superior crystallinity and a higher intrinsic specific surface area. Meanwhile, H-CuCo PBA shows greater gas adsorption potential, and has a positive influence on the development of PBA for other applications.

The purpose of the present invention is to provide a granulation adsorbent having high strength and in particular stability in water that ensures certain throughputs at low costs. The granulated adsorbent of the invention comprises a metal-cyano complex as an effective component, a flocculation precipitant for flocculation precipitation of the metal-cyano complex from slurry containing the metal-cyano complex, a binder, and a crosslinking agent. The granulated adsorbent is produced by a step of adding the flocculation precipitant to the metal-cyano complex slurry and then dehydrating the metal-cyano complex slurry to prepare a metal-cyano complex dehydrated cake, a step of heat drying the metal-cyano complex dehydrated cake to prepare a metal-cyano complex dried block, a step of pulverizing the metal-cyano complex dried block into metal-cyano complex powder, and a step of preparing a mixture containing the metal-cyano complex powder, binder and crosslinking agent, and then granulating using the mixture.

The invention relates to a potassium tetracyanopalladate synthesis method, which comprises: S1, acid dissolution oxidation: carrying out a dissolution reaction on a metal palladium powder raw material to generate a palladium nitrate-containing aqueous phase solution; s2, precipitation: carrying out precipitation reaction on the aqueous phase solution containing palladium nitrate prepared in the step S1 to generate a palladium cyanide solid intermediate; s3, washing: washing the palladium cyanide solid intermediate generated in the step S2 to remove impurity ions; and S4, reactive crystallization: reacting the palladium cyanide intermediate purified in the step S3 with potassium cyanide, and crystallizing to obtain a potassium tetracyanopalladate product. According to the method, synthesis of potassium tetracyanopalladate can be achieved through a simple and rapid method, and the obtained product is high in purity, uniform in crystal form, good in solubility and suitable for application scenes with high requirements for plating quality in the industries of semiconductors, PCBs, aerospace and the like; the potassium tetracyanopalladate is used as a key raw material of a palladium plating process and is used in the field with high requirements on material performance and appearance.

The application relates to the technical field of liquid flow batteries, in particular to a Fe-free Prussian blue analogue, a preparation method thereof and a solid energy storage material. a [M(CN) b ] c ; wherein: V exists in one of V 2+ , V 3+ , VO 2+ or VO2 + or a mixed form of two or more thereof; wherein M is one of Co, Ni or a mixture of Co and Ni, when M is the mixture of Co and Ni, the molar ratio of Co to Ni is 3:1-1:3, the molar ratio of M to V is 1:2-1:5; the trivalent cobalt is partially reduced, the molar ratio of trivalent nickel to divalent nickel is <=0.3:1, and V, M and cyanide ions form a three-dimensional network crystal through coordination bonds. The Fe-free Prussian blue analogue of the application is prepared by directly coordinating hexacyanocobaltate and / or tetracyanonickelate with a vanadium ion salt solution after valence state regulation, and can solve the technical problems of poor reversibility and low voltage efficiency of the existing solid energy storage material.

The invention belongs to the technical field of metal-organic framework materials, and provides a metal cyanide metal-organic framework material with a cation gating effect and a preparation method and carbon dioxide capture application thereof, the structural general formula of the metal-organic framework material is Mx [M '(CN) 6] y.Az.nH2O, n represents the water content of the material, and n is larger than or equal to 0 and smaller than or equal to 10; when n is greater than or equal to 1, the XRD spectrum of the crystal structure has a single peak at 2theta = 16 + / -2 degrees and 20 + / -2 degrees, and has a single peak or double peaks at 2theta = 13 + / -2 degrees, 22 + / -2 degrees and 24 + / -2 degrees, and the crystal structure belongs to a space group (space group number 167) in a trigonal system; when 0 < = nlt; 1, the XRD pattern of the crystal structure has a single peak at 2 [theta] = 10 + / -2 degrees and 16.5 + / -2 degrees, and has a single peak or double peaks at 14.5 + / -2 degrees and 20.2 + / -2 degrees, and the space group of the crystal structure is converted into a P2 / c space group (space group number 13). The metal-organic framework material has the highest CO2 adsorption capacity and selectivity in carbon dioxide capture, in particular to flue gas carbon dioxide adsorption in a low-pressure (less than or equal to 0.15 bar) and high-humidity environment (more than or equal to 40% RH).

The invention discloses a potassium sulfate-based KxNayMn [Mn (CN) 6]. NH2O preparation method, which is characterized in that a manganese sulfate aqueous solution is used as a first solution, a sodium cyanide aqueous solution containing sodium sulfite is used as a second solution, and potassium sulfate is introduced into the first solution and / or the second solution as a potassium source; and dropwise adding the second solution into the first solution in an inert environment, carrying out a co-precipitation reaction to obtain a suspension, and carrying out aging treatment to obtain a final product. Cheap sodium cyanide is used for replacing potassium cyanide to serve as a cyano source, potassium ions are introduced in combination with potassium sulfate, the production cost is remarkably reduced, and efficient recovery of raw materials and emission reduction of cyanide-containing wastewater are achieved by cooling, crystallizing and recycling reaction mother liquor. The Prussian blue compound prepared by the invention has a regular crystal structure and excellent electrochemical performance, and is suitable for being used as a sodium ion battery negative electrode material.

The application belongs to the technical field of composite materials, and relates to an electrode material, in particular to a preparation method of a manganese octacyanomolybdate nanoparticle / carbon nanotube (Mn2[Mo(CN)8] / CNTs) composite material. A carboxylated carbon nanotube dispersion liquid and a manganese salt aqueous solution are prepared, and then the two are mixed. A prepared potassium octacyanomolybdate aqueous solution is added, and after uniform stirring, isopropanol is added, and then the mixture is left to stand, centrifuged, washed with deionized water and ethanol, and vacuum dried, and the manganese octacyanomolybdate nanoparticle / carbon nanotube composite material is obtained. The manganese octacyanomolybdate nanoparticle / carbon nanotube composite material is prepared by a co-precipitation method, and the manganese octacyanomolybdate nanoparticles grow in situ on the surface of the carbon nanotube conductive framework. The prepared composite material is applied to a water-based zinc ion battery positive electrode. The application is simple and feasible, has good composite effect, the prepared composite material shows excellent zinc storage performance, is suitable for large-scale production, and has potential application prospects.

The invention relates to the technical field of battery materials, and discloses a Prussian blue positive electrode material and a preparation method and application thereof. Researchers find that the specific water content and distribution ensure the structural stability of the material in the battery cell preparation process in the test, and the battery cell does not generate gas and does not fall off during circulation. Therefore, according to the Prussian blue type positive electrode material provided by the invention, the mass content ratio of coordination water Xa to interstitial water Xb to adsorbed water Xc is (0.2-5): 1, and the mass content ratio of Xc: Xa is (0.1-5): 1, so that the stability of water distribution of the Prussian blue type positive electrode material in the pole piece drying process is avoided, the stability of the material structure is kept, and meanwhile, the advantage of certain interstitial water for improving circulation is exerted; and shedding of the positive electrode material caused by the volume effect of phase change during circulation of the material with extremely low water content is avoided, so that the battery prepared from the material as the positive electrode material has excellent cycle stability.

This application relates to a Prussian blue analogue with a core-shell structure, which has a core and a coating layer covering the core. Among them, the chemical formula of the core is as follows in Formula 1, Na x P[R(CN)6] δ ·zH2O Formula 1 where P and R are each independently selected from at least one of transition metal elements, 0 < x ≤ 2, 0 < δ ≤ 1 and 0 ≤ z ≤ 10. The chemical formula of the coating layer is as follows in Formula 2, A y L[M(CN)6] α ·wH2O Formula 2 where A is an alkali metal or alkaline earth metal element other than sodium, L and M are each independently selected from at least one of transition metal elements, 0