40 results about "Tantalum chloride" patented technology

This invention introduces a method for treating a surface of an electrically conductive object with a refractory metal. In one embodiment, the refractory metal is tantalum and the object is a titanium substrate. A surface layer of mixed tantalum and titanium oxides is created by first heating the object and tantalum chloride in a reaction chamber and subsequently heat treating the object in an oxygen containing environment. The electrically conductive object can in a non-limiting way be DSA solutions (Dimensionally Stable Anodes), fuel cells or connector plates.

The invention relates to a preparing method for a visible light response CdS / (cal-Ta2O5-SiO2) composite photocatalyst. The method includes the steps of dissolving tantalum chloride in an ethanol water solution, adjusting pH to be equal to 4-6 with citric acid, adding silicon balls to stir for 3-8 h, conducting centrifugal separation, drying at 80 DEG C, roasting for 2 h at 400-600 DEG C to obtaina sample, and repeating the above steps by 3 times to obtain a Cal-Ta2O5-SiO2 sample; immersing the sample into 0.2 M Cd (AC) 2 solution for 2-3 min, immersing the sample into 50-80 ml of 0.2 M Na2Ssolution for 2-3 min, centrifuging, and washing; putting into a drying oven at 80 DEG C for drying for 12-16 h; repeating in this way, and finally obtaining the sample which is named as CdS / (cal-Ta2O5-SiO2). The preparing method is novel, precursors are low in cost and uniform in size, and moreover, the CdS / (cal-Ta2O5-SiO2) composite photocatalyst has high photocatalytic activity, a long catalytic life, and a potential industrial application value.

The preparation process of tantalum-containing carbon-base composite material precursor includes mixing coal tar pitch or petroleum asphalt of softening point of 60-80 deg.c and tantalum chloride in the mass ratio of 100 to 1-20 in inert atmosphere and water-less environment; and reaction at 260-420 deg.c and self pressurizing or 0.3-1.0 MPa pressure while mechanical stirring for 4-10 hr. The preparation process is simple and low in cost, and the tantalum-containing carbon-base composite material precursor may be used as the soaking agent, adhesive or self-sintering material for preparing high performance tantalum-containing carbon-base composite material.

The invention discloses a preparation method of niobium, tungsten and tantalum-doped cobalt trioxide and belongs to the technical field of lithium ion batteries. The preparation method is characterized in that the synthetic reaction is performed by taking a certain concentration of cobalt solution as a cobalt source, a sodium hydroxide solution as a precipitating agent, an ammonia aqueous solutionas a complexing agent, a hydrazine hydrate solution as a reducing agent and a niobium, tungsten and tantalum chloride anhydrous alcohol solution as a doping agent; in the reaction process, the niobium, tungsten and tantalum chloride anhydrous alcohol solution is added in a reaction kettle in a dispersive liquid adding manner to participate in the reaction; after the end of the synthetic reaction,a synthetic product is oxidized into hydroxyl cobalt oxide by utilizing a hydrogen peroxide solution under the condition of a certain pH value, and then a mixture is washed, dried and calcined to obtain a niobium, tungsten and tantalum-doped cobalt trioxide product with uniformly-distributed doped elements; the production efficiency is high. The niobium, tungsten and tantalum-doped cobalt trioxide product prepared by the preparation method disclosed by the invention has a doping amount of 0.5-1 percent, has the uniformly-distributed doped elements, has a laser particle size of 15-20 mum, a tap density of more than or equal to 2.5 g / cm<3> and a specific surface area of 1.0-3.0 m<2> / g and has a massive or nearly-spherical appearance.

Provided is a method for preparing an oxygen tantalum nitride photocatalytic material by means of waste tantalum capacitors. The method comprises the following steps that various waste tantalum capacitors are subjected to mechanical crushing and decladding; metal and nonmetal are separated; metal materials are subjected to magnetic separation, and ferro-nickel magnetic materials are separated; screening is conducted, and tantalum-containing powder is obtained; the tantalum-containing powder is subjected to chlorination treatment, and tantalum chloride is obtained; tantalum chloride is dissolved into an alcoholic solution, ammonia gas is introduced to separate ammonium chloride out, filtration is conducted, and an alcoholic solution of tantalum is obtained; the alcoholic solution of tantalum is hydrolyzed, tantalum oxide sol is obtained, drying is conducted, and tantalum oxide gel is obtained; the tantalum oxide gel is subjected to high-temperature calcination in ammonia gas atmosphere, and the oxygen tantalum nitride photocatalytic material is obtained. The method for preparing the oxygen tantalum nitride photocatalytic material by means of the waste tantalum capacitors has the advantages that the waste tantalum capacitors in the market are utilized, requirements of photocatalytic tantalum material preparation on tantalite ore are reduced, and nickel and iron electrodes in the waste tantalum capacitors are recycled.

The invention discloses a dehydrofluorination catalyst aiming at solving the problems of low activity of the catalsyt and low selectivity to Z-type fluoroolefin. The precursor of the catalyst consists of 30-80 percent of trivalent chromium compound, 10-35 percent of metal halide and 10-35 percent of fluoride of ammonium by mass percent, wherein the trivalent chromium compound is chromic oxide or chromium hydroxide, the metal halide is stannic chloride, titanium tetrachloride, tantalum chloride, antimony pentachloride, tin tetrafluoride, titanium tetrafluoride, tantalic fluoride or antimony pentafluoride, and the fluoride of ammonium is ammonium fluoride or ammonium bifluoride. The catalyst is prepared by the following method: evenly mixing the trivalent chromium compound, the metal halideand the fluoride of ammonium by mass percent, pressing and shaping the mixture, and then baking and activating by hydrogen fluoride. The dehydrofluorination catalyst has high activity and selectivityto the Z-type fluoroolefin and is mainly used for preparing corresponding Z-type fluoroolefin by dehydrofluorination using hydrofluorocarbon as the material under the condition of gaseous phase reaction.