41 results about "Lanthanide nitrate" patented technology

The invention relates to a preparation method of a catalyst for synthesizing methacrylic acid. The preparation method comprises the following steps: preparing a heteropoly compound catalyst by adopting an ionic liquid and metal salt step-by-step precipitation method; performing a reaction on a molybdenum-containing compound, a vanadium-containing compound and phosphoric acid to obtain solution or slurry A; preparing imidazolium ionic liquid into solution B; preparing alkali metal nitrate, transition metal nitrate and lanthanide nitrate into mixed aqueous solution C; adding the B and the C into the A in a step-by-step precipitation and aging mode; and then obtaining the catalyst by concentrating, drying, forming and roasting. The catalyst prepared by the method has high activity and high selectivity for the reaction of preparing methacrylic acid by carrying out gas-phase oxidation on methylacrolein and has high mechanical strength and high thermochemical stability.

The invention relates to a preparation method of a zirconic acid lanthanum ceramic fiber. The method comprises the following steps: preparing a gel fiber through a colloidal sol centrifugal fiber forming technology by using zirconium nitrate as a zirconium source, lanthanum nitrate as a lanthanum source, citric acid as a chelating agent, and water as a solvent, and calcining the gel fiber to form the zirconic acid lanthanum ceramic fiber. A precursor prepared by the invention has stable colloidal sol property and is good in filamentation property with no need of adding a polymer spinning additive. The prepared zirconic acid lanthanum ceramic fiber is good in flexibility, compact in microstructure, good in phase stability an low in heat conductivity coefficient and can be used for high-temperature thermal-insulation material, and the crystal form of the zirconic acid lanthanum ceramic fiber is pyrochlore form.

The present invention is a La@Zr@SiO 2 @Preparation method of bentonite phosphorus removal adsorbent. The method includes steps 1) mixing cetyltrimethylammonium bromide and ammonia water in deionized water; 2) slowly adding ethyl orthosilicate to the mixed solution; 3) adding bentonite to the mixed solution and stirring for reaction A solid-liquid mixture is obtained; 4) after the solid-liquid mixture is subjected to suction filtration and washing steps, the solid phase is dried at a constant temperature, and granulated and calcined to be SiO 2 @Bentonite composite material; 5) Dissolve zirconium oxychloride and lanthanum nitrate in absolute ethanol, and mix with SiO 2 @Bentonite composite material stirs the reaction, the solid phase is filtered and dried and then added to the NaOH solution to continue the reaction to obtain a composite adsorbent. The adsorbent prepared by this method can adsorb phosphorus in real sewage in a dynamic system, and has good regeneration ability, which not only provides a method for the utilization of bentonite and the development of new phosphorus adsorption materials, but also provides a method for the treatment of phosphorus-containing wastewater. an effective way.

The invention discloses a method for preparing SLYTON perovskite nitrogen oxide powder, which comprises fully dissolving soluble strontium salt, soluble lanthanum salt, soluble yttrium salt, soluble tantalum salt and combustion auxiliary agent in alcohol-water mixed solution , the combustion reaction occurs when the temperature is programmed, and it is kept in the high temperature stage for a certain period of time, and the precursor is formed by cooling, and then the precursor is subjected to high-temperature nitriding treatment to obtain the target product. Soluble strontium salt is one of strontium chloride or strontium nitrate or a mixture thereof; soluble lanthanum salt is one of lanthanum chloride or lanthanum nitrate or a mixture thereof; soluble yttrium salt is one of yttrium chloride or yttrium nitrate or a mixture thereof. The soluble tantalum salt is one of tantalum pentachloride or tantalum pentaethoxide or their mixture; the combustion aid is one of urea or citric acid or their mixture. The product of the invention has high purity and low impurity content, and can be used in the fields of ferroelectricity, photoelectricity, photocatalysis, fuel cells and the like.

The invention discloses a preparation method of a high-efficiency air absorbing material. The preparation method comprises the following steps: (1) after slurry is subjected to refining treatment, de-liquoring and concentrating, adding a sodium hydroxide solution in a concentrated solution, mixing and stirring, increasing the temperature to 80 DEG C, reacting for 1 hour and then neutralizing and concentrating to 25 percent by weight of fiber pulp; (2) adding a silver nitrate and lanthanum nitrate mixed solution for fully mixing and then defiberizing to obtain micro-filament plant fiber slurry;(3) stirring and mixing the fiber pulp and fermentation mother liquor, introducing acetobacter xylinum for aerated culture, adding the micro-filament plant fiber slurry for uniform stirring and performing static culture to obtain bacterial cellulose cross-linked colloidal liquid; (4) in the colloidal liquid, adding a filling agent for uniform stirring, then adding a NaOH solution and after treatment, filtering, cleaning and granulating. The high-efficiency air absorbing material prepared by the preparation method disclosed by the invention realizes super adsorption ability to PM2.5 and otherharmful particles, meanwhile has a sterilizing effect and is natural and environmentally friendly in raw material, and simple and mild in preparation conditions.

The invention discloses a sealing agent for aluminum and aluminum alloy anode oxide films and a preparation method for the sealing agent. The sealing agent comprises the following raw materials by lL: 15-20g of lanthanide nitrate, 0.6-0.8g of oxidizing agent, 0.25-0.3g of stabilizing agent and deionized water, wherein the additive amount of the deionized water is the amount of adding the deionized water until the volume is constant at 1L after the rest raw materials are mixed. According to the sealing agent disclosed by the invention, by utilizing the combined action of rare-earth metal and the oxidizing agent, porous layers of the anode oxide films can be effectively sealed, and the corrosion resistance of the anode oxide films is obviously improved. Meanwhile, the sealing agent disclosed by the invention does not contain chromium, nickel or fluorine, therefore, the human body cannot be harmed, and the environment cannot be polluted. The sealing agent is a green environmental-protection sealing agent. Moreover, the aluminum and aluminum alloy anode oxide films can be sealed at normal temperature, therefore, not only is the energy consumption reduced but also the operation convenient is improved. After being treated by the sealing agent disclosed by the invention, the aluminum and aluminum alloy anode oxide films are compact in surface structure, is in uniform golden yellow and is higher in bonding strength.