181 results about "Rare earth metal compounds" patented technology

A method of treating a thermal barrier coating comprises applying a dopant composition to a selected surface of the thermal barrier coating disposed on a turbine engine part, and heating the surface to form an enhanced thermal barrier coating. The dopant composition comprises a rare earth metal compound.

The invention discloses a catalytic agent for an air electrode and a novel air electrode manufactured by the catalytic agent and a manufacturing method of the air electrode; the catalytic agent for the air electrode is formed by compounding a main catalytic agent and at least one auxiliary catalytic agent; the main catalytic agent is metal salts containing manganese, and the auxiliary catalytic agent is rare earth compound or rare metal compound; the weight of the main catalytic agent accounts for 60-85 percent of total weight of the catalytic agent, and the remaining is the auxiliary catalytic agent. The novel air electrode is formed by pressing a catalytic membrane, a current collector and a water-proofing breathable film sequentially. In order to manufacture the novel air electrode, thecatalytic membrane and the water-proofing breathable film are firstly manufactured, and then are pressed together or pressed together with a meshed current collector, and then the air electrode is prepared after removing organic solvents.

The invention discloses a catalyst preparing zero-COx hydrogen by ammonia decomposition reaction as well as its preparing method. Its components: active component 0.1-30%, carrier 60-99% and assistant 0-20%. The active component is a metal nitride where the metal is selected from the transition metals and has noble metal property, the carrier is a nano crystal metal oxide (crystal particle size 2-200nm); the assistant is selected from alkali metal, alkali earth metal and rare-earth compound. Its preparing method: firstly, dipping the carrier in the solution of the precursor of the active component, and then drying to bake at 300-900 deg.C; then reducing the sample at 300-900 deg.C by hydrogen, adding in the assistant, drying and baking and then activating at 300-900deg.C. It has very high catalysis activity to ammonia decomposition reaction and simple preparing technique. It can be applied to not only the reaction technique of making zero-COx hydrogen by ammonia decomposition, but also the purifying treatment.

A light-emitting element is provided, in which n (n is a natural number of two or more) EL layers are provided between an anode and a cathode. Between the m-th (in is a natural number, 1≦m≦n−1) EL layer and the (m+1)-th EL layer, a first layer containing any of an alkali metal, an alkaline earth metal, a rare earth metal, an alkali metal compound, an alkaline earth metal compound, and a rare earth metal compound, a second layer containing a substance having high electron-transport properties in contact with the first layer, and a charge-generation layer containing a substance having high hole-transport properties and an acceptor substance in contact with the second layer are provided in this order over the anode. The charge-generation layer does not have a peak of an absorption spectrum in a visible light region.

A catalyst for preparing non-COx hydrogen by decomposing reaction of ammonia is prepared from active component (0.5-20 wt.%) chosen from noble metal and the nitride of noble metal, carrier (70-99 wt.%) which is carbon nanotubes, and assistant (0-20 wt.%) chosen from the compounds of alkali metal, alkali-earth metal and rare-earth metal through immersing carbon nanotubes in the solution of active component's precursor, drying, calcining, reducing in hydrogen, adding assistant, drying, calcining and activating. Its advantages are high activity and stability, and high product purity.

The invention discloses an UV-resistant nylon plastic material comprising the raw materials of, by weight, 40-50 parts of PA6, 35-45 parts of modified glass fiber, 5-10 parts of polyethylene, 10-15 parts of a polyethylene-grafted maleic anhydride polymer, 10-15 parts of polypropylene, 20-30 parts of wollastonite, 10-20 parts of kaolin, 30-40 parts of glass microbead, 3-8 parts of carbon black, 5-10 parts of nano-grade titanium dioxide, 1-3 parts of a titanate coupling agent, 1-3 parts of polyethylene wax, 0.5-1.5 parts of zinc stearate, 1-2 parts of a dispersant, 2-4 parts of a toughening agent, 1-2 parts of a lubricant, 1-3 parts of an antioxidant, 1-4 parts of a light stabilizer, 1-2 parts of an ultraviolet absorber, 0.5-0.8 parts of a rare earth metal compound, and 1-5 parts of maleic anhydride-grafted EPDM. The plastic material provided by the invention has good mechanical performances, good UV resistance, and long service life.

The purifying catalyst for gas containing cyanogen is granular or formed carrier made of SiO2, Al2O3, zeolite or other material and carrying soaked transition metal oxide(s) and/or RE metal oxide(s). It is prepared through soaking the carrier in water soluble transition metal oxide(s) and/or RE metal oxide(s) and subsequent drying and activating in the air at 80-600 deg.c. The catalyst can convert compound containing cyanogens in the air completely into harmless compound at 200 deg.c and may be used widely in chemical industry, environment protection and other fields.

The invention relates to the field of spinning materials and provides a nylon 6 resin. The nylon 6 resin is prepared by carrying out polymerization reaction on a mixing fusant of a caprolactam monomer and a rare-earth metal compound, wherein the weight percentage of the rare-earth metal compound is 0.01-0.8% on the basis of the total weight of the caprolactam monomer. The invention also provides a nylon 6 filament made of the nylon 6 resin, and the nylon 6 filament is obtained by carrying out melt spinning on the nylon 6 resin. Fine denier or super-fine denier nylon filaments with fineness of about 0.20-1.0dtex can be obtained by using the nylon 6 resin and the preparation method thereof; the strength and the elongation at break of the fiber are in line with post-weaving requirements, the blank that the fine denier or super-fine denier nylon 6 filaments can be manufactured by adopting a conventional high-speed spinning method at home and abroad is filled up, and the technological content and the additional value of a nylon 6 fiber product are increased.

The invention belongs to the technical field of catalysts and preparation thereof, and discloses a catalyst for preparing hydrogen gas without COx by ammonia decomposition reaction and a preparation method thereof. Co-Mo nitride with noble metal property is used as the main active component of the catalyst, alkali metal, alkali-earth metal, transition metal or rare earth compound is used as an additive of the catalyst, and carbon nanotubes are used as carriers. The catalyst is prepared by the isometric impregnation process and the temperature programed nitridation technology, wherein the nitridation is realized by the nitriding gas which is a mixture of nitrogen gas and hydrogen gas, proportion of nitrogen gas and hydrogen gas is controlled in a staging manner, hydrogen gas dominates in the reduction stage, and the nitrogen gas dominates in the nitriding stage, so that the catalyst prepared by the method has fine reaction activity and stability and is low in cost and simple in preparation process.

The invention discloses a method for preparing cyclic carbonate. The method specifically comprises the following step: with a quadri-aryloxy bridged rare earth metal compound as a catalyst, catalyzing carbon dioxide and alkylene oxide to react in the present of quaternary ammonium salt, wherein the general formula of the quadriaryloxy bridged rare earth metal compound is LLn(THF), wherein L refers to ethanediamine group bridged quadri-aryloxy, Ln refers to rare earth metal ions, and the quaternary ammonium salt is one of tetrabutylammonium iodide, tetrabutylammonium bromide, tetrabutylammonium chloride, tetraoctyl ammonium bromide, bis(triphenylphosphine) ammonium chloride and benzyl butyl ammonium bromide. The rare earth catalyst in the catalysis system is clear in structure, easy to synthesize, high in catalysis activity, less in using amount, mild in reaction conditions and wide in universality to alkylene oxide. According to the preparation method disclosed by the invention, raw materials are easily available, the reaction conditions are wild, a reaction substrate is wide in universality, the reaction time is short, the yield of the target product, namely the cyclic carbonate is high, and the reaction operation and the posttreatment process are simple.

The invention discloses a catalytic wet oxidation catalyst and a preparation method thereof. The catalyst comprises the following core-shell structure components, the core-shell structure components take active carbon loaded with transition metal as a core, and take alumina containing rare earth metal or amorphous silicon-aluminum as a shell. The method is characterized in that during a gel forming process of alumina or amorphous silicon-aluminum and a rare earth metal compound, an active carbon slurry loaded with transition metal is introduced, and after the gel forming process, the catalyst can be obtained through an aging process. The catalyst has high reaction activity and usage stability.

The invention discloses a welding and cutting gas which consists of a natural gas and a gain agent, wherein the gain agent consists of a rare earth metal compound, a transition metallocene compound, methanol, toluene, methyl tertiary butyl ether, cyclohexane, nonane, decane and water. Compared with acetylene and propane, the welding and cutting gas is more economical, more energy-saving, more environment-friendly, safer and cleaner. The invention also provides a preparation method of the welding and cutting gas.

Provided are a rare earth nano phosphor and a method of preparing a rare earth nano phosphor, the method includes: (a) synthesis of rare earth nano phosphor precursor particles by radiating microwave energy to a solvent where rare earth metal compounds are dissolved; and (b) sintering of inorganic salt and the rare earth nano phosphor precursor mixture.

The present invention provides a process for efficiently obtaining polyethers having its high degree of polymerization by easily polymerizing substituted epoxides which could hardly or could not be made so far to provide a high degree of polymerization. That is, a polyether is obtained by a process which comprises ring-opening-polymerizing at least one substituted epoxide, except for propylene oxide and epihalohydrin, in the presence of a rare earth metal compound represented by the formula (I) and a reducing compound:Wherein M represents a rare earth element selected from Sc, Y and lanthanide, and L1, L2 and L3 are same as or different from each other and each of them represents an oxygen-binding ligand.

A light-emitting element includes an EL layer between an anode and a cathode, and a first layer, a second layer, and a third layer between the cathode and the EL layer. The first layer provided between the cathode and the second layer is in contact with the cathode and the second layer, and includes a substance having a hole-transport property and an acceptor substance. The second layer provided between the first layer and the third layer is in contact with the first layer and the third layer, and includes a phthalocyanine-based material. The third layer provided between the second layer and the EL layer is in contact with the second layer and the EL layer, and includes an alkali metal, an alkaline-earth metal, a rare-earth metal, an alkali metal compound, an alkaline-earth metal compound, or a rare-earth metal compound.

The invention discloses a high-temperature alterant, which comprises the following components in percentage by weight: 15 to 20 percent of chloride, 40 to 45 percent of chloride, 25 to 30 percent of rare earth metal compound, 3 to 8 percent of titanium dioxide, and 2 to 6 percent of graphite. The invention also discloses a method for purifying a fusant, wherein the high-temperature alterant is added into a smelting furnace. The high-temperature alterant can reduce the sodium content in an electrolytic molten aluminum fusant and effectively control the grain size to achieve good grain refining effect. The method for purifying the fusant can effectively reduce gas and foreign impurities in the fusant, optimize the production process, ensure the quality of aluminum and aluminum alloy fusants, improve the ingot yield, save the energy consumption, and reduce the discharge of pollutants.

The present disclosure relates to a plasma resistant coating film and a fabricating method thereof, more particularly a plasma resistant coating film and a fabricating method thereof which can secure chemical resistance by means of, after thermally spraying the first rare earth metal compound, double sealing through aerosol deposition and hydration, thereby minimizing open channels and open pores in the coating layer and plasma corrosion resistance by means of the dense rare earth metal compound coating film.

It is a preparation method of cracking catalyst which can resist heavy metal pollution. Making clay, de-ionized water and optional additive well blended to get clay slurry. Making molecular screen de-ionized water and optional additive well blended to get molecular screen slurry. Making agglomerant, de-ionized water, alkali soil metal compound, rare earth compound and optional inorganic acid well blended to get agglomerant slurry. Uniform mixing three kinds of slurry mentioned before, and then drying the mixture. This kind of cracking catalyst has good resistivity to nickel and vanadium, and even when there is a high level of nickel in the catalyst, the cracking catalyst can work well.

The invention discloses bridged bisamido rare-earth amide compounds, and a preparation method and catalytic application thereof. The general formula of the rare-earth compounds is {LLn[N(SiMe3)2].THF}2, and the chemical structural formula is disclosed in the specification. In the general formula, L represents a bridged bisamido ligand, and the ligand LH2 is N,N'-(cyclohexane-1,2-diyl)bis(4-tert-butylbenzamide); and Ln is a rare-earth metal selected from lanthanum, neodymium, samarium, yttrium or ytterbium. The bridged bisamido rare-earth amide compounds have the advantages of simple synthesis process, definite structure and high yield. The invention also discloses a preparation method of the compounds and an application method of the compounds as a catalyst for catalyzing carboxylation reaction between alkynyl terminal group and carbon dioxide. The application method has the advantages of mild conditions, high activity, favorable selectivity and wide substrate application range.

To provide a method of producing a spherical aluminum nitride powder which has a large thermal conductivity and excellent filling property, and is useful as a filler for heat-radiating materials.

[Means for Solution] The spherical aluminum nitride powder is produced by reductively nitriding a mixture of 100 parts by mass of an alumina or an alumina hydrate, 0.5 to 30 parts by mass of a rare earth metal compound and 38 to 46 parts by mass of a carbon powder at a temperature of 1620 to 1900° C. for not less than 2 hours.