248 results about "Palladium oxide" patented technology

The invention relates to porcelain glaze and in particular relates to high and low-temperature resistant porcelain glaze for enamel. According to the technical scheme, the highnd low-temperature resistant porcelain glaze for enamel is prepared from the following raw materials in parts by weight: 22-38 parts of sodium silicate with the modulus of 2-3.8, 11-19 parts of aluminum oxide, 10-20 parts of manganese dioxide, 6-9 parts of palladium oxide, 6-9 parts of high-boron calcium borate, 23-29 parts of lead sulfate, 2-4 parts of talc, 7-13 parts of calcium carbonate, 8-12 parts of barium sulfate, 12-19 parts of zinc sulfate and 2-9 parts of titanium oxide. The high and low-temperature resistant porcelain glaze has excellent ultralow-temperature resistance and high-temperature resistance.

The invention discloses a thermostable white nano far-infrared ceramic powder and a preparation method thereof. The thermostable white nano far-infrared ceramic powder is prepared from the following components in percentage by weight: 20-30% of nano alumina, 3-8% of nano magnesia, 15-25% of nano monox, 10-20% of nano zirconia, 15-25% of nano zinc oxide, 7-10% of nano titanium oxide, 1-3% of nano rare earth oxide and 0.1-0.3% of nano precious metal oxide. In the invention, the nano rare earth oxide is one of yttrium oxide or lanthana or cerium oxide, and the nano precious metal oxide is one of platinum oxide or palladium oxide. The nano far-infrared ceramic powder can be subjected to subsequent processing at the high temperature of 1300-1450 DEG C, without reduction of radiance and radiation intensity, wherein the radiance can reach 0.90-0.94, and the nano far-infrared ceramic powder is white and can be widely applied to far-infrared household porcelain, wall and floor tiles, heating ceramic plates and high-temperature coating.

A dealkylation and transalkylation catalyst for increasing the output of heavy (C9 or more) arylhydrocarbon contains the hydrogen-type zeolite containing SiO2/Al2O3 (20-90 Wt portions), adhesive (10-80) and palladium oxide (0.001-5).

The invention discloses a catalyst for preparing alcohol through hydrogenation of acetic acid, and a preparation method of the catalyst. The catalyst is a multicomponent load catalyst and comprises ingredients a, b and c, and a carrier, wherein the ingredient a is one or more of calcium, potassium, sodium, barium, strontium, calcium oxide, potassium oxide, sodium oxide, barium oxide and strontium oxide; the ingredient b is one or more of tin, cobalt, molybdenum, nickel, iron, tin oxide, cobalt oxide, molybdenum oxide, nickel oxide and iron oxide; the ingredient c is one of platinum, palladium, ruthenium, rhodium, platinum oxide, palladium oxide, ruthenium oxide and rhodium oxide; the carrier is silicon dioxide, cerium dioxide, titanium dioxide, graphite, aluminum oxide or active carbon; and the mass ratio of the ingredient a to the ingredient b to the ingredient c to the carrier is (1-20):(0.5-2):(0.5-1):100. The multicomponent load catalyst is prepared by a multistep impregnation method, and used for preparing alcohol through the hydrogenation of acetic acid, and results prove that the catalyst is excellent in catalytical performance, long in service life and high in reaction stability.

The invention discloses a method for recycling palladium from a palladium-contained waste catalyst. The method comprises following steps that firstly, waste pre-treatment, wherein composite liquid isadopted for eluting the palladium-contained waste catalyst, filtering is carried out, and palladium-contained filter residue is obtained; secondly, palladium formation through palladium oxide reduction, wherein a reducing agent and the palladium-contained filter residue are used for having a reaction, the palladium oxide in the waste residue is reduced into elementary substance palladium; thirdly,acid soluble operation to obtain palladium ions, wherein organic acid haves a reaction with the elementary substance palladium, and an acid solution system existing in a palladium ion state is obtained; fourthly, replacement to obtain palladium, wherein a metal replacement method is adopted to carry out replacement on the palladium ions in the acid solution system, and sponge palladium is obtained; fifthly, palladium refining, wherein hydrogen is further used for reducing the metal palladium, and high-purity metal palladium is obtained. The organic composite liquid is used for eluting the palladium-contained waste catalyst, the problems of high energy consumption and environment pollution in the prior art are solved, the process flow is short, and the problems that in the current palladium recycling technology, energy consumption is high, and the recycling rate is low are solved.

The invention relates to a method for treating a waste mobile phone circuit board and recovering precious metals. The method comprises: crushing and burning a waste mobile phone circuit board; washing residue with water after burning; soaking the washed residue in sulfuric acid, stirring, and concentrating the filtrate to produce a copper sulfate product; washing the filter residue with water to remove the residual sulfuric acid; adding nitric acid to the washed residue, stirring, and filtering; respectively treating the filtrate and the filter residue, wherein O3 is introduced into the filtrate to carry out an oxidation reaction and then filtration is performed, the filter residue is a palladium oxide product, and the filtrate is concentrated to produce a silver nitrate product; heating the filter residue, and dissolving in aqua regia to carry out a reaction; adding sodium hydroxide or potassium hydroxide to adjust the pH value to 10-12, filtering, and uniformly heating the filter residue for 30-40 min at a temperature of 140-150 DEG C; and adjusting the temperature to 250-300 DEG C, and uniformly heating for 20-30 min to produce a gold product. According to the invention, the waste mobile phone circuit board is subjected to the harmless treatment and the precious metals in the waste mobile phone circuit board are recovered, such that the waste mobile phone circuit board pollution problem is solved, and the waste of valuable resources is avoided.

The invention provides a titanium anode plate with a precious metal combination coating. The titanium anode plate is provided with titanium base materials. The surface of the titanium base materials is orderly coated with a ruthenium oxide coating, a mixing coating of molybdenum oxide, tantalum oxide and titanium oxide, and a mixing coating of iridium oxide and palladium oxide. The titanium anode plate provided by the invention solves the anode corrosion problem in a mixing system of chloride and sulfate, prolongs the service life of a titanium anode, and is suitable for producing metal materials, such as nickel, cobalt, copper, and the like through hydrometallurgy electrolysis.

The invention discloses a supported magnetic nano-palladium/gold catalyst and a preparation method and an application thereof, which belong to the field of a nano-material and an environment restoration material. The catalyst takes a ferriferrous oxide/silicon oxide core-shell structure as a carrier, the palladium/gold nano particles are supported on the surface; a surface etching method is used for processing the surface of the carrier, a ferriferrous oxide/silicon oxide carrier with the rough surface is constructed; then a homogeneous precipitation method is used for precipitating a palladium oxide which is a precursor of palladium on the surface of a silicon oxide shell layer, finally hydrogen is used for reduction, and crosslinking of polyvinylpyrrolidone is used for fixing the palladium nano particles on the silicon oxide shell layer. The catalyst has good monodispersion performance, the catalytic activity component palladium/gold can be distributed on the surface of the catalyst, so that the utilization is fully realized. The catalyst can be used for catalytic reduction of pollutants such as nitrite, azos dye and hexavalent chromium in water, has superparamagnetism, is easy to separat and reuse, and has high stability.

The invention discloses an activation and regeneration method of a deactivated catalyst in a process of synthesizing dimethyl oxalate by CO. The activation and regeneration method mainly comprises the following steps: washing the deactivated catalyst with alkali at high temperature and under high pressure and removing organic matters attached on the surface of the catalyst; immersing with a pore-expanding agent solution and roasting at 400 DEG C to 700 DEG C to remove deposited carbon attached on the surface of the catalyst and dredge a blocked pore channel of the catalyst; purging with mixed gas of nitrogen gas and hydrogen chloride to disperse an active Pd material which grow large by agglomeration again; immersing with alkali liquid and fixing the Pd material, which is dispersed again, on a carrier; finally, reducing with the catalyst through two steps including a wet process and a dry process, so as to reduce palladium oxide into palladium. The deactivated catalyst is subjected to activation treatment by the method and the agglomerated and sintered active Pd material is effectively dispersed; the activity of the catalyst can be recovered to be about 96 percent of original activity. The method provided by the invention is simple in process, easy to operate and low in cost, and circulating utilization of a noble metal catalyst is realized.

The invention discloses a CO gas-phase oxidative coupling oxalate synthesizing palladium catalyst reactivating method in coal ethylene glycol production technical synthesizing processes. The method comprises four steps of baking at high temperature CO gas-phase oxidative coupling oxalate synthesizing palladium catalyst of Pd/a-Al2O3 to remove impurities like organic matters and carbon carried by carriers, and converting palladium on the catalyst into palladium oxide; reacting the catalyst with acid to convert the palladium oxide into soluble palladium salt, and together drying and baking the reacted solution and the carriers to redistribute and load palladium products on the carriers; performing reduction treatment to obtain reactivated palladium catalyst of Pd/a-Al2O3. The reactivated catalyst can restore the quality of fresh catalyst. The CO gas-phase oxidative coupling oxalate synthesizing palladium catalyst reactivating method can effectively reactivate deactivated palladium catalyst to obtain the catalyst excellent in active indexes.

A preparation method of nano palladium oxide catalyst comprises following steps: (1) preparing a nano palladium array and an alumina composite structure; (2) extracting the nano palladium array; (3) subjecting the nano palladium array to a heat treatment to obtain a nano palladium oxide array. The operation of the preparation method is simple. The pH value is adjusted through controlling the ammonia liquor concentration in the electro-deposition solution. The electro-deposition current density, the electro-deposition time, and the temperature and time during the heat treatment process are controlled to prepare a nano-grade palladium oxide array, which has a relatively high specific surface energy and catalyzing ability. The morphology of the nano palladium oxide is controllable, the size of the nano palladium oxide is the same, the application range is wide, and the nano palladium oxide is especially suitable for applications of tailing gas purifying technology in the automobile industry.

The invention discloses a carbon loaded palladium oxide nano cluster catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts and preparation thereof. The invention solves the technical problems of low activity, poor stability, complex preparation method and no possibility of batch production for the catalyst for preparing hydrogen by decomposing formic acid in the prior art. The preparation method comprises the following steps: firstly, uniformly dispersing porous carbon in water at room temperature to obtain first suspension; then dropwise adding a Pd(II) precursor into the first suspension and stirring for 4 to 6 hours to obtain second suspension; finally, adjusting the pH value of the second suspension to 10 to 12 by using alkaline liquor and stirring for 4 to 12 hours to obtain third suspension; carrying out suction filtration, washing and drying to obtain the catalyst. The preparation method has the advantages of simplicity, economy, environment friendliness and suitability for large-scale industrial production; in addition, the prepared catalyst has the advantages of particle shape, good stability, good dispersity, high decomposition rate of catalyzing the formic acid and capability of showing excellent activity and stability on preparation of the hydrogen through the decomposition of the formic acid.

The invention relates to a method for preparing metal palladium nanowires of controllable size. The method is characterized in that the method comprises the following steps of (1) preparation of palladium oxide nano-particles, namely a palladium chloride solution of certain concentration is prepared according to needs and hydrolysis is carried out; (2) preparation of azelon, namely an insulin solution is dropwise added on a mica sheet; (3) synthesis of palladium oxide nanowires, namely palladium oxide nano-particle solution is dropwise added on the mica sheet with azelon deposited, and then cultivation and blow-drying are carried out to obtain the palladium oxide nanowires; (4) reduction of palladium oxide, namely borane dimethyl amine is dropwise added on the mica sheet with the palladium oxide nanowires prepared, and after cultivation, washing and blow-drying, the one-dimension metal palladium nanowires are obtained. Compared with the prior art, the method can be used for preparing the environment-friendly metal palladium nanowires of controllable size and is simple.

The invention relates to a supported palladium catalyst using palladium oxide as a support and a preparation method thereof. A solid base and a metal salt are subjected to mixing reaction to obtain stable palladium oxide colloid and palladium solution; the palladium solution and the palladium oxide colloid are mixed, to be specific, the palladium solution and the palladium oxide colloid are mixed well for reacting and supporting; after several hours, centrifugal washing, lyophilizing, high-temperature calcining and low-temperature reduction are performed to obtain the finished catalyst. The support material, palladium, for the catalyst is evenly distributed on the support palladium oxide; therefore, the catalyst has good low-temperature oxidizing performance, and can fully oxidize carbon monoxide at 60 DEG C. In addition, by adjusting the concentration of the solid base dissolving in the solution and the temperature of mixing, the temperature for the catalyst to fully oxidize carbon monoxide is controllably variable in the range of 60 DEG C to 150 DEG C. Therefore, the catalyst is more suitable for different operating conditions and window temperatures.

The invention provides a cerium-based catalyst for producing chloromethane by catalyzing oxidization reaction of methane chloride and a preparation method thereof, and relates to the cerium-based catalyst. The catalyst is Pd/CeO2 catalyst which is produced from cerium dioxide modified by palladium oxide, or Mn-Pd/CeO2 catalyst which is produced from cerium dioxide modified by palladium oxide and manganese together. The Pd/CeO2 catalyst is produced through the steps of: preparing CeO2 at first, adding a palladium salt solution to water and then adding the CeO2, evaporating to dryness in a water bath, and finally, performing drying and baking. The Mn-Pd/CeO2 catalyst is produced through the steps of: preparing CeO2 at first, mixing a manganese salt solution with a palladium salt solution in water and then adding the CeO2, evaporating to dryness in a water bath, and finally, performing drying and baking. The preparation method is simple and suitable for generating chloromethane by catalytically converting methane through the oxidization reaction of methane chloride. Besides, the catalyst is capable of obviously improving the selectivity of CH3Cl and the conversion rate of methane. The catalyst is also stable in catalytic performance for the oxidization reaction of methane chloride.