8 results about "Promethium" patented technology

The invention discloses a modification method of a ternary positive electrode material. The modification method comprises the following steps: S1, carrying out a co-precipitation reaction on a solution of transition metal sulfate in an inert gas atmosphere; a sulfate solution of rare earth elements is synchronously added in the coprecipitation process, and a ternary precursor with the surface coated with rare earth hydroxide is formed; and S2, mixing the ternary precursor obtained in the step S1 with a lithium source, calcining in an air atmosphere, and cooling to obtain the fast ion conductor coated ternary positive electrode material, the rare earth elements are selected from one or more of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium; the transition metal sulfate is soluble salt of Ni, Co and Mn. The rare earth element sulfate is added in the coprecipitation process, the rare earth element hydroxide is precipitated on the surface of the precursor, the lithium source is removed after filtering and drying, uniform mixing is performed, and the ternary positive electrode material which contains the rare earth element and is uniformly coated with the fast ion conductor is obtained after calcination, so that side reactions on the surface of the material are reduced; and the cycling stability of the positive electrode material is improved.

The invention relates to a microbial growth activation accelerant based on rare earth elements as well as a preparation method and application thereof, and belongs to the field of resources and environments. The microbial growth activation accelerant based on the rare earth elements is prepared from the following components: 1 to 150g of a rare earth compound, 0.2 to 2g of pantothenic acid, 0.2 to 2g of nicotinic acid, 0.02 to 0.1 g of nicotinamide and 1000g of deionized water, the rare earth compound is one or combination of more of chlorides of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium and yttrium, nitric acid compounds and sulfuric acid compounds. A large number of cheap light rare earth elements are used as raw materials of the microbial accelerator, a new utilization approach is provided for the light rare earth elements, the light rare earth elements are converted into high-added-value products, pollution of the light rare earth elements to the environment is reduced, and meanwhile new elements are introduced into the field of microbial accelerators. More importantly, the preparation method of the microbial growth activation accelerant based on the rare earth elements provided by the invention is simple in production process and convenient for large-scale production.

Piezoelectric material comprising a ceramic material with the composition (1-x) ((Bi (a-y) RE y ) FeO3) - x (Ba b TiO3), where the molar fractions x and y satisfy the following conditions 0.28 ≤ x ≤ 0.34 and 0.0005 ≤ y ≤ 0.032 ; where RE is one or more elements from the group consisting of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and yttrium, where a = 1.04 and where b = 1.007, where the composition belongs to the perimeter and interior of a polygon which has the following eight points P (x; y) as vertices with respect to the values ​​of x and y: P1 = (0.301; 0.032); P2 = (0.304; 0.004); P3 = (0.304; 0.0315); P4 = (0,310; 0,003); P5 = (0.310; 0.029); P6 = (0.314; 0.026); P7 = (0,327; 0,005); P8 = (0,329; 0,0005).

This invention discloses a rare-earth metal fluoride superionic conductor dielectric film and its preparation method. The dielectric film is prepared from a rare-earth metal fluoride superionic conductor using a thermal evaporation method. The rare-earth metal fluoride superionic conductor is selected from scandium fluoride, yttrium fluoride, lanthanum fluoride, cerium fluoride, neodymium fluoride, samarium fluoride, europium fluoride, gadolinium fluoride, holmium fluoride, erbium fluoride, ytterbium fluoride, praseodymium fluoride, promethium fluoride, terbium fluoride, dysprosium fluoride, thulium fluoride, and lutetium fluoride. This invention utilizes thermal evaporation to heat and evaporate the rare-earth metal fluoride source material into a gaseous state within an evaporation system. The gaseous fluoride directly adheres to a substrate placed above the source material and recrystallizes. This allows for controllable thickness and defect number of the rare-earth metal fluoride, resulting in high integration. Therefore, rare-earth metal fluoride superionic conductor dielectric materials show great potential in the design and manufacture of novel functional devices.

This invention discloses a divalent rare earth-graphyne composite material, its preparation method, and its application in thermocatalytic ammonia production, belonging to the field of catalyst materials technology. The divalent rare earth-graphyne composite material comprises rare earth ions, iodide ions, and graphyne material. The rare earth ions are selected from at least one divalent ion of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, and yttrium. The rare earth ions and iodide ions exist on the surface of the graphyne material in the form of nanoparticles. This divalent rare earth-graphyne composite material achieves thermocatalytic ammonia production under mild conditions through the interaction of rare earth nanoparticles and oxygen-containing functional groups on the graphyne surface, and is expected to become a new generation of high-performance thermocatalytic ammonia production catalyst.

The application relates to the technical field of wastewater treatment, and discloses a preparation method of a photo-Fenton catalyst, which comprises the following steps: firstly, mixing, dispersing rare earth oxide powder, iron salt and deionized water to prepare dispersion liquid one; secondly, mixing and dispersing carbon nanotubes and deionized water to prepare dispersion liquid two; finally, mixing the dispersion liquid one and the dispersion liquid two, heating, evaporating the solvent and grinding to obtain the photo-Fenton catalyst; the rare earth oxide is at least one selected from oxides of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium and yttrium; the iron salt is at least one selected from ferrous chloride, ferrous sulfate and ferrous nitrate; in the process of mixing the photo-Fenton catalyst prepared by the above method with hydrogen peroxide to treat wastewater, the concentration of hydroxyl radicals in water is improved to a certain extent, and the decomposition ability of organic matters is improved; in addition, the application further discloses a photo-Fenton catalyst and a wastewater treatment method.

Disclosed in the present invention are an ammoxidation catalyst, and a preparation method therefor and the use thereof. The active component of the catalyst is represented by general formula MoxBiaFebAcBdCeDfEgFhOy, wherein A represents at least one element selected from a combination of nickel, cobalt, manganese, zinc and cadmium; B represents at least one element selected from a combination consisting of magnesium, strontium and barium; C represents at least one element selected from a combination consisting of potassium, rubidium and cesium; D represents at least one element selected from a combination of tungsten, vanadium, chromium, gallium, germanium, scandium, yttrium, indium, tin and antimony; E represents at least one element of lanthanide elements other than promethium; and F represents at least one element of platinum group elements. In the present invention, the composition proportion of the active component of the catalyst is adjusted and controlled according to the action mechanism of a metal catalyst, thereby improving the comprehensive performance of the catalyst and achieving a relatively high trinitrile product yield and a relatively low trinitrile production material consumption.

The application discloses a biomimetic water-splitting catalyst containing rare earth ions and a preparation method and application thereof, the catalyst contains [Mn n XO m ] cluster compounds, wherein n is 3 or 4; m is 2, 4 or 5, the cluster compound is a rare earth manganese heteronuclear metal cluster compound containing rare earth ions X and one of the following core structures: [Mn3XO2] heteronuclear metal cluster skeleton core, [Mn4XO4] heteronuclear metal cluster skeleton core and [Mn4XO5] heteronuclear metal cluster skeleton core, and the X is selected from scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium or lutetium. In the application, the valence of the manganese ions in the cluster compounds is +3 or +4, and the manganese ions have important values in magnetic materials. In addition, the [Mn4XO4] and [Mn4XO5] cluster compounds obtained in the application can be used as artificial water-splitting catalysts, and can be used for catalytic splitting of water on the surface of an electrode or driven by an oxidant (which can be a stable oxidant or a transient oxidant generated by light induction).