59results about How to "Lower valence" patented technology

The invention discloses a method for preparing cerium oxide nano particles and antioxidation use thereof and belongs to the field of biological nano materials. The method for preparing the cerium oxide nano particles comprises: adding glacial acetic acid into aqueous solution of a cerate and sodium acetate, uniformly stirring and mixing, heating the mixed solution for 5 to 60 hours, centrifuging,washing and drying an obtained yellow precipitate, and obtaining cerium oxide nano particles. Meanwhile, based on the subunit desorption and re-polymerization of proteins, the cerium oxide nano particles are filled into cavities of apoferritin which is a spherical cavity protein by controlling the opening and closing of the shell of the spherical protein, and thus, the biocompatible nano antioxidant is obtained. The method can improve the biocompatibility of the cerium oxide nano particles, lower the cytotoxicity of the cerium oxide nano particles and improve the antioxidant activity of the cerium oxide nano particles obviously.

The invention provides a production method of a composite metal oxide functional electrode. The production method comprises the following steps: dissolving cobalt nitrate hexahydrate, copper nitrate trihydrate and urea in methanol to obtain a precursor solution, impregnating a carbon cloth in the precursor solution, and carrying out a hydrothermal reaction on the mixture of the carbon cloth and the precursor solution at 160-200 DEG C for 2-4 h to obtain an electrode precursor; and calcining the electrode precursor at 250-350 DEG C for 2-4 h to obtain a Co3O4/CuO electrode loaded on the carboncloth, impregnating and reducing the carbon cloth loaded with the Co3O4/CuO electrode in a sodium borohydride solution for 5-15 min to obtain a carbon cloth loaded with a CoO/Cu2O functional electrode, and performing vacuum drying. The CoO/Cu2O functional electrode obtained by the production method has the advantages of excellent reduction catalysis performance, efficient realization of reductionremoval of nitrates, low concentration of intermediate byproducts, and wide engineering application prospect.

A method of reclaiming a well completion brine solution by using an organic chelant that is capable of discriminating between (i) iron and non-zinc heavy metals; and (ii) calcium and zinc. The chelant contains a functional group selected from the group —CO₂H or —PO(OH)R²⁰ or a salt or ester thereof, —C(O)—, —OE, —SE, —N═C(R²)R³, EO—N═C(R²)R³, —N(R²)R³, and —N(C(O)R¹)R² group optionally substituted with a —COOH or —PO(OH)R20 or a salt or ester thereof, —SE or —OE group, wherein R² and R³ are independently selected from E or forms, with nitrogen, phosphorous, oxygen or sulfur, a heterocyclic ring; E is R¹ or —H; R¹ is a C₁-C₃₀ alkyl or aralkyl group or a derivative thereof and R²⁰ is —OH or R¹.

The invention discloses a fuel reactor device for chemical-looping combustion. The device consists of a mixing and reaction chamber, an overflow groove, a transition section, a riser and a carbon dioxide separator, wherein the riser is connected with the mixing and reaction chamber through the transition section; the lower end of the riser is provided with a feed port, and the upper end of the riser is connected with the upper end of the carbon dioxide separator; the lower end of the carbon dioxide separator is connected with the mixing and reaction chamber through the overflow groove; the lower end of the mixing and reaction chamber is provided with a grid plate; the lower end of the mixing and reaction chamber is provided with a solid fuel inlet; a discharge port is formed on the outer side of the mixing and reaction chamber; and a loose air port is formed at the lower end of the overflow groove. Due to the large change of cross sections of the riser and the mixing and reaction chamber change, and the selection of the position of the feed port, the device has the advantages of improving the oxygen carrying capacity of oxygen carrier and guarantees discharge of clean carbon dioxide in chemical-looping combustion, and solving the problem that clean carbon dioxide cannot be obtained during hydrogenation in chemical-looping hydrogenation.

A process is provided for converting an alkane to an oxygenated product by passing an alkane gas over a first fixed bed containing a higher valence bromide salt to produce an alkyl bromide, a hydrobromic acid, and a lower valence bromide salt. The alkyl bromide and hydrobromic acid are conveyed as a gas to a second fixed bed containing a metal oxide and are passed over the second fixed bed to produce the first bromide salt and the oxygenated product. The metal oxide in the second fixed bed is regenerated by passing oxygen over the second fixed bed producing the metal oxide and bromine. The bromine is conveyed as a gas from the second fixed bed to the first fixed bed. The first bromide salt of the first fixed bed is regenerated by passing the bromine over the first fixed bed producing the first bromide salt.

The invention provides a method for regenerating a cathode material of a waste lithium ion battery through electrolysis of molten alkali. The method includes the following steps: 1) mechanically disassembling the waste lithium ion battery, separating a mixture of the cathode material, and reducing the cathode material of the waste lithium ion battery in an argon and hydrogen atmosphere; 2) mixinghydroxide with the molten alkali, taking the pre-reduced cathode material of the waste lithium ion battery in the step 1) as a raw material, and preparing a high-quality lithium ion battery cathode material by a one-step electrolysis method. The method has the advantages that through pre-reduction, the valence state of transition metal elements in the waste lithium battery is reduced, the dissolution quantity of the transition metal elements is increased, and the problem that high-valence cathode materials are insoluble is solved. Compared with the prior art, the method has the advantages thatthe use of hydrogen peroxide and organic acids is avoided, and the recovery rate is reduced.

A method of reclaiming a well completion brine solution by using an organic chelant that is capable of discriminating between (i) iron and non-zinc heavy metals; and (ii) calcium and zinc. The chelant contains a functional group selected from the group —CO₂H or —PO(R²¹)R²⁰ or a salt or ester thereof, —C(O)—, —OE, —SE, —N═C(R²)R³, EO—N═C(R²)R³, —N(R²)R³, and —N(C(O)R¹)R² group optionally substituted with a —COOH or —PO(R²¹)R²⁰ or a salt or ester thereof, —SE or —OE group, wherein R² and R³ are independently selected from E or forms, with nitrogen, phosphorous, oxygen or sulfur, a heterocyclic ring; E is R¹ or —H; R¹ is a C₁-C₃₀ alkyl or aralkyl group or a derivative thereof and R²⁰ and R²¹ are independently selected from —OH, —OR¹ and R¹.

The invention belongs to the field of firing and wet comprehensive smelting of rare earth ore and particularly relates to a method for separating and producing rare earth from iron-containing rare earth raw ore. An iron bead product and a rare earth product are obtained through steps as follows: grinding, mixing, agglomerating, distribution in a rotary hearth furnace, smelting separation in the rotary hearth furnace, roasting, water leaching and the like. Under the condition of relatively lower cost, production efficiency and rare earth leaching rate are greatly increased.

The invention provides a lithium silicate coated lithium-rich manganese-based positive electrode material and a preparation method and application thereof. The chemical general formula of the positiveelectrode material is Li2Mn0.5M0.5O2X/Li2SiO3, M is a + 4-valent transition metal, and X is a halogen element. By introducing + 4-valent transition metal ions and halogen element ions, the valence state of Mn in the obtained modified lithium-rich manganese-based positive electrode material is reduced, and the reaction activity of O is reduced, so that the reversible specific capacity and the cycling stability of the material are improved; meanwhile, the lithium silicate is used for compounding the lithium-rich manganese-based positive electrode material, so that the formation of intercrystalline cracks of the material in a high-pressure process is inhibited, and the capacity retention ratio of the material is improved.

The invention discloses a preparation method of a sodium chlorate generator electrode. The preparation method comprises the following steps of (1) matrix treatment, (2) preparation of inner-layer active coating liquid, (3) preparation of inner-layer metal oxide, (4) preparation of outer-layer active coating liquid, and (5) preparation of the electrode. According to the novel preparation method of the sodium hypochlorite generator electrode, the prepared electrode has the advantages of being low in chlorine evolution potential, high in oxygen evolution potential, energy-saving, environmentally friendly, long in service life and high in electrolytic efficiency.

The invention provides a preparation method of a modified nickel-cobalt-manganese ternary cathode material, comprising the following steps: 1) preparation of the modified nickel-cobalt-manganese and 2) preparation of the niobium doped nickel-cobalt-manganese ternary cathode material. The invention also discloses a modified nickel-cobalt-manganese ternary cathode material prepared according to thepreparation method of the modified nickel-cobalt-manganese ternary cathode material and a lithium ion battery using the modified nickel-cobalt-manganese ternary cathode material as the cathode material. Compared with the traditional Ni-Co-Mn ternary cathode material in the prior art, the modified Ni-Co-Mn ternary cathode material prepared by the invention has the advantages of lower production cost, higher gram capacity, higher cycle stability and energy density, more excellent electrochemical performance, longer cycle service life, higher first charge-discharge efficiency, and safer and environmentally friendly use.

The invention discloses a preparing method for an air-permeable chlorine-evolution electrode. The preparing method comprises the following steps of (1) base body treatment, (2) precursor deposition bath preparing, (3) deposited layer preparing, (4) thin film middle layer preparing, (5) active solution preparing, and (6) sintering. The preparing method for the air-permeable chlorine-evolution electrode of a novel sodium hypochlorite generator is low in chlorine evolution potential, long in service life, high in electrolytic efficiency and low in operating cost.

The invention relates to a multi-element lithium-rich manganese-based positive electrode material and a preparation method and application thereof. The chemical formula of the multi-element lithium-rich manganese-based positive electrode material is expressed as Li2MnaMxM'yM''zO2B, a is greater than or equal to 0.5 and less than 1, x is greater than 0 and less than 1, y is greater than 0 and lessthan 1, and z is greater than 0 and less than 1; B is a halogen element; M is a +4 valence metal; M' is a +5 valence metal; M'' is a +6 valence metal, and Mn is +2 valence. According to the multi-element lithium-rich manganese-based positive electrode material provided by the invention, various high-valence cations are introduced at the same time, and halogen elements are introduced, so that the valence state of Mn and the reaction activity of O are reduced, the stability of the obtained lithium ion battery positive electrode material is improved, and the obtained lithium ion battery positiveelectrode material has the advantages of high voltage and high reversible specific capacity.

The invention provides a method for controlling the valence state equilibrium of electrolyte in the energy storage module of an all-vanadium liquid flow battery. An electrolyte valence state reductiondevice is connected in parallel into a negative electrolyte pipeline, the valence state of electrolyte in the energy storage module of an all-vanadium liquid flow battery is reduced by electrolysis,and the electrolysis is stopped when the valence state reaches equilibrium. According to the invention, an electrolyte valence state reduction device is connected in parallel into a negative electrolyte pipeline, there is only the need to consume electric energy, there is no need to add other substances into the energy storage module, and the pump and the pipeline of the energy storage module arefully utilized. The method is simple and convenient to use and simple to operate, and can reduce labor cost compared with other methods. Meanwhile, online operation can be carried out, and the goal ofreducing the overall valence state of electrolyte in the energy storage module is achieved without stopping the operation of the energy storage module.

The invention discloses a catalyst for alkane oxidation, wherein the phosphorus-vanadium atom ratio is 1: (0.9-1.0), the phosphorus-molybdenum atom ratio is 1: (0.001-0.1), the phosphorus-aluminum atom ratio is 1: (0.9-1.1), and the phosphorus-oxygen atom ratio is 1: (7-10). A preparation method of the catalyst comprises the following steps: synthetizing a phosphorus-vanadium-oxygen precursor, synthetizing immobilized ammonium molybdate, synthetizing the catalyst, and activating the catalyst. The catalyst is used for preparing acetic acid through ethane oxidation, preparing crylic acid through dimethylmethane oxidation, and preparing fumaric acid and/or cis-butenedioic anhydride through butane oxidation. The preparation method has the advantages of simple technology, low production cost, nontoxicity, and low energy consumption and environment friendless during the production process.