34results about How to "Valence stable" patented technology

The invention provides an activated carbon load single valence state cuprous oxide chloride-free catalyst used for oxidating oxo synthesis carbonic ester, and a preparation method of the catalyst. The catalyst is a chloride-free catalyst taking activated carbon as a carrier; the active constituent of load is single valence state cuprous oxide, and the load capacity accounts for 12 to 22wt% of the carrier (copper is taken as the criteria). The preparation process comprises preparation of activated carbon load cupric acetate and preparation of activated carbon load single valence state cuprous oxide catalyst. The invention has the advantages that the preparation method of the catalyst is simple, the price is low, no chlorine exists when the catalyst provided by the invention is in use, the valence state of the active constituent is single and stable, sintering can not occur easily, and the product of dimethyl carbonate is high in selectivity, high in catalytic activity and the like.

A catalyst including: a support, the support including a mixture of SiO₂ and ZrO₂; an active ingredient including copper; a first additive including a metal, an oxide thereof, or a combination thereof; and a second additive including Li, Na, K, or a combination thereof. The metal is Mg, Ca, Ba, Mn, Fe, Co, Zn, Mo, La, or Ce. Based on the total weight of the catalyst, the weight percentages of the different components are as follows: SiO₂=50-90 wt. %; ZrO₂=0.1-10 wt. %; copper=10-50 wt. %; the first additive=0.1-10 wt. %; and the second additive=0.1-5 wt. %.

The invention discloses a preparation method of a cobalt-coated lithium ion battery anode material. The preparation method comprises the following steps of: coating Co(OH)2 on the surface of a lithium manganate matrix through chemical precipitation, wherein a complexing agent solution, a precipitant solution and a metal cobalt salt solution are added to a high-speed stirring reaction kettle, which is used for mixing up lithium manganate LiMn2O4 sizing agent, for carrying out a precipitation reaction; carrying out solid-liquid separating and drying into the discharged sizing agent after the cobalt precipitate is sufficiently reacted; carrying out high-temperature oxidation onto the materials by utilizing an oxidizing furnace under an oxygen atmosphere and a strong alkaline environment; carrying out pure water washing and solid-liquid separation onto the solid material after the oxidation reaction is completed; and obtaining the hydroxyl cobalt oxide-coated lithium manganate anode material after drying. The preparation method disclosed by the invention is low in device requirement, simple in process, good in material conductivity, long in cycle life, good in rate capability and high in capacity.

The invention discloses a separation and enrichment determination method for Ir, Rh, Pt, Pd and Au in a secondary resource material. The method includes the following steps that 1, samples are dissolved, and after high-temperature firing carbon removal, a Na2O2+NaCO3 mixed fluxing agent is adopted for fusion in a muffle furnace of 750 DEG C; 2, a test solution is oxidized, an appropriate quantity of sodium chlorate solution is added in a dissolving solution, boiling is performed, and Ir in the solution is oxidized so that the valence state can be made stable; the solution is adjusted to be at the appropriate volume, and the volume concentration of hydrochloric acid reaches 50%; 3, tellurium coprecipitation separation is carried out; 4, determination is carried out, an inductively coupled plasma optical emission spectrometry (ICP-AES) is used for determining the content of the Ir, Rh, Pt, Pd and Au in the solution obtained in the third step at the same time. The accurate and fast separation and enrichment determination method is specifically used for the Ir, Rh, Pt, Pd and Au with the content scope being 0.001%-5% in the secondary resource material such as waste and metallurgical middle materials formed in the using process of various precious metal products. The method is also suitable for separation and enrichment determination of Ir, Rh, Pt, Pd and Au single elements in the secondary resource material.

The invention discloses a preparation method of an anode material of a lithium ion cell, comprising the following steps of: (1) uniformly dispersing a Li source, a Mn source, a Ni source, a doping element and a metal element with superionic conductor attributes to prepare a precursor, wherein the metal element with the superionic conductor attributes is selected from two or two more of Ti, La andZr; (2) drying or igniting the precursor, then carrying out pretreatment to obtain pretreatment powder; (3) pressing the pretreatment powder into a sheet; (4) carrying out heat treatment for 6-24h; and (5) annealing, naturally cooling to room temperature, grinding, and sieving to obtain the anode material. In the invention, on the one hand, a crystal skeleton of the material and a Mn valence state are stabilized by using the doping element, on the other hand, a compound lithium ion superionic conductor improves a migration rate of the lithium ion in the material and improves the multiplying power property and cycling property of an electrode are improved.

The invention discloses a method for regulating and controlling interaction between metal nanoparticles and a carrier by plasma, which comprises the following steps: S1, loading a metal precursor on the carrier by adopting an impregnation method or a deposition-precipitation method, and cleaning and drying to obtain a catalyst; s2, putting the obtained catalyst into a plasma generating device, andpretreating the catalyst by adopting plasma in a reducing atmosphere; s3, in an oxidizing atmosphere, activating the catalyst by adopting plasma; and S4, after activation treatment, treating the catalyst by adopting plasma in a reducing atmosphere to obtain the supported metal catalyst. According to the method disclosed by the invention, the supported catalyst is pretreated, activated and retreated in sequence by utilizing plasmas generated by discharging in different atmospheres, so that the interaction between the metal nanoparticles and the carrier is effectively modulated, and the stability of the nano-catalyst is remarkably enhanced while the sizes of the metal nanoparticles are controlled.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method and application for a vanadium trioxide negative electrode material. The preparation method for the vanadium trioxide negative electrode material comprises the steps that an ammonium vanadate compound is taken as a precusor substance, a silicon wafer is taken as a carrier, a lithium sheet is taken as a reducing agent, the above substances are placed in a crucible and is calcined in a tube furnace, the above substance is cooled to the indoor temperature naturally, and a V2O3 negative material is obtained. The preparation method is simple and feasible, the production cost is low, and the safety coefficient is high; the prepared V2O3 negative material is of a multi-level structure, and material shape can be controlled. In addition, the prepared V2O3 negative material is used for assembling a half cell, the result shows that the V2O3 negative material is high in specificcapacity, good in rate capability and stable in circular performance. The prepared V2O3 material is taken as the negative material to produce lithium ion batteries and has a wide application prospect.

The invention relates to a high-performance perovskite cell and a preparation method thereof. The perovskite solar cell uses a Fe2-xMgxO3 thin film prepared by a solution method as an interface passivation layer to passivate adjacent interfaces of a perovskite photosensitive layer of a perovskite photovoltaic cell, x is greater than or equal to 0 and less than or equal to 0.2, and the thickness is30-40 nm. According to the perovskite photovoltaic cell, Fe2-xMgxO3 is used as an interface passivation layer, the preparation cost of the perovskite cell is greatly reduced, the crystallization quality of a perovskite thin film is improved by utilizing the interaction of iron, iodine, oxygen and lead, meanwhile, carriers can be rapidly migrated by the Fe2-xMgxO3 thin film, and charge accumulation at an interface is reduced; a proper amount of magnesium element can also form strong chemical bonds with surrounding ions, the structure of adjacent interfaces of perovskite is stabilized, interface defects are reduced, non-radiative recombination is reduced, and the purpose of improving device performance is improved.

The invention discloses a preparation method and application of a nano-copper catalyst. The method comprises the following steps: (1) preparing a bicarbonate solution, and dissolving an organic acid salt and a copper salt precursor in the bicarbonate solution; and (2) placing a conductive substrate in the solution obtained in the step (1), introducing at least one of N2 and CO2 gases, and simultaneously performing electrochemical reduction to obtain the nano-copper catalyst. The preparation method of the catalyst is simple, mild in condition and easy to operate. In the electrochemical reduction preparation process of the copper catalyst, the organic anions can be coordinated with copper on the surface of the catalyst and are induced to form an oriented crystal face, so that the stability and activity of the nano-copper catalyst are improved. When the nano-copper catalyst is applied to the process of electrocatalytic reduction of CO2, organic anions coordinated on the surface of the nano-copper catalyst can stabilize the valence state of surface copper and inhibit structural recombination of the catalyst in the electrocatalytic process, so that the nano-copper catalyst has excellent electrocatalytic reduction performance and stability of CO2.

The invention relates to a styrenic quaternary carbon compound and a preparation method thereof. The general structural formula of the styrenic quaternary carbon compound is (img file='dest_path_image002. TIF'wi='86'he='122'/), wherein R1 is C1-C8 alkyl chain or aromatic group and R2 is the substituent group of OMe and CF3. The reaction of the styrenic quaternary carbon compound and the preparation method thereof is the catalytic-reduction coupled reaction of metallic nickel, wherein the reducing agent is the environmentally friendly Zn powder and the catalyst is nickel bromide glycol dimethyl ether (NiBr2. glyme) which has the advantage of low cost and stable valence. The reaction condition has the advantages of being mild, being simple to operate, having good acceptability for functional groups and higher productivity as well as producing no-isomerized by-products of tertiary halogenated substrates.

The invention belongs to the technical field of functional high polymer materials, and provides star-branched ternary integrated rubber prepared through catalysis of a mono-scandium-cyclopentadienyl rare earth catalyst and a preparation method of the star-branched ternary integrated rubber. The star-branched ternary integrated rubber is prepared by copolymerizing a macromonomer containing a plurality of overhanging double bonds, amino-containing styrene, isoprene and butadiene under the catalysis of a mono-scandium-cyclopentadienyl rare earth catalyst. The content of amino-containing styrene is 5%-50% by mole, and the content of isoprene is 20%-90% by mole; the content of the 3, 4-polyisoprene is 3%-78% based on the total molar amount of the polyisoprene being 100%; the content of the 1, 4-polybutadiene is 50%-98% based on 100% of the total mole of the polybutadiene; the amino-containing styrene is selected from styrene derivatives containing nitrogen substituent groups. The prepared star-branched terpolymer can effectively improve the blending performance of the star-branched terpolymer and a polar filler, increase the acting force between a rubber matrix and the filler, and improve the physical and mechanical properties of a rubber material.

The invention relates to the technical field of chemical processes, in particular to a preparation method of a D2 structure hexafluoropropylene dimer. According to the preparation method of the D2 structure hexafluoropropylene dimer, 5-bromine-6-sulfydryl pyridine and vinyl trifluoroborate are subjected to a sulfydryl-alkene reaction, the prepared auxiliary is added into metal fluoride, the valence state of metal can be stabilized, the catalytic activity can be improved, and high dispersion of active components in a fluorine-containing catalyst is achieved.

The invention relates to an imitated jewel photochromic glass. The imitated jewel photochromic glass comprises, by weight, 30-60 parts of silicon dioxide (SiO2); 5-20 parts of rare earth element oxide; and 0.5-3 parts of aluminum oxide (Al2O3). The imitated jewel photochromic glass has a photochromic effect, the hue difference delta h0 is 20 degrees or above, and the obvious red-green discoloration phenomenon can be observed by naked eyes. The imitated jewel photochromic glass is green or green with yellow color under natural light (D65 light source) due to doping of rare earth elements, is red or red with brown color under an incandescent lamp (A light source), and is in various transition colors between the red color and the green color under a mixed light source. In addition, the invention also provides a preparation method and application of the imitated jewel photochromic glass.