22 results about "Palladium oxide" patented technology

The invention provides a bacteriostatic proppant technology based on a palladium oxide-reduced graphene oxide composite material, aiming at the problem of hydrogen loss caused by microbial activity in a hydrogen storage bank of an exhausted gas reservoir. A PdO (at) rGO composite material functionally modified by lead ions (Pb < 2 + >) is loaded on the surface of a porous ceramsite carrier to form an adsorption-inactivation-blocking synergistic antibacterial network; precise laying of the proppant in a crack network is achieved through the end sand removal technology, hydrogen consumption is reduced, and an efficient, economical and environment-compatible innovative solution is provided for biological pollution control of the underground hydrogen storage library.

A method comprising: generating NO2 in a catalyst (70) comprising a washcoat with zirconium, one or more base metal oxides and a palladium oxide, wherein an exhaust gas flow rate is between the lower and upper threshold flow rates; and facilitating regeneration of a particulate filter (72) located downstream of the catalyst (70) via NO2 when an exhaust gas temperature is greater than a threshold temperature; wherein the palladium oxide is contained in an upstream section (70A) of the catalyst (70) in relation to a direction of the exhaust gas flow; and the at least one base metal oxide is contained in a downstream section (70B) of the catalyst (70) in relation to the direction of the exhaust gas flow.

Various embodiments disclosed herein provide for several methods of fabricating p-type semiconductors with industrially relevant hole mobilities that are back end of the line (BEOL) compatible. A first method of fabrication includes forming a buffer layer on a substrate, forming a palladium oxide layer over the buffer layer, annealing the palladium oxide layer, and then forming a cap layer over the palladium oxide layer, then cooling the stack, wherein each step is performed at a variety of predefined temperatures. Each of the substrate, buffer layer and cap layer can be magnesium oxide. A second method includes forming a palladium oxide layer over a titanium dioxide substrate, annealing the stack, and then cooling the stack, all performed at a different variety of predefined temperatures.

The invention relates to a preparation method and application of an alkaline palladium ruthenium hydroxide-cerium oxide electrocatalyst with a high-activity and wide-potential stability window. According to the preparation method, the non-platinum carbon-loaded ruthenium-based alloy is successfully prepared by adopting a wet chemical reduction and annealing combined method, and uniform dispersion of metal nanoparticles is realized. The palladium ruthenium-cerium oxide electrocatalyst prepared by the invention is small in particle size, uniform in dispersity and relatively high in current density and mass ratio activity, the problem of inactivation caused by over-oxidation of the ruthenium-based electrocatalyst under relatively high potential is also greatly improved, and the palladium ruthenium-cerium oxide electrocatalyst is suitable for an oxidation reaction of hydrogen at an anode side of an alkaline fuel cell.

The invention relates to the technical field of palladium recovery, and particularly discloses a method for efficiently recovering palladium from a waste palladium / resin catalyst, and the method comprises the steps of oxygen-enriched roasting, vacuum roasting, synergistic oxidation leaching and the like, and can achieve the following effects that under the oxygen-enriched condition, on one hand, decomposition and combustion of macromolecular organic matter are accelerated, and the decomposition rate of a resin carrier is increased; under the conventional roasting condition, the resin decomposition rate is 70-80% within 1-2 h, the organic matter decomposition rate is increased to 85-95% after oxygen is blown in, and subsequent leaching of palladium is facilitated. And meanwhile, the temperature required by roasting is reduced, and efficient decomposition of organic matters can be realized at 500-650 DEG C. Through vacuum roasting, palladium oxide is reduced under the high-temperature condition, the reduction process is shortened, and the efficiency is improved. Hydrochloric acid, hydrogen peroxide and ozone are adopted for synergistic leaching, and the leaching rate is increased; the bivalent palladium in the ozone oxidation solution is adopted, compared with systems such as nitric acid and chlorine, the method is more environmentally friendly, and pollution is reduced.

This invention discloses a supported boron-doped palladium oxide cluster catalyst, its preparation method, and its application. The preparation method includes optimizing the geometry and electronic structure of the Pd clusters through Pd precursor regulation and B atom doping. The B-doped Pd oxide cluster material substrate is carbon nitride, the Pd cluster loading is 0.5-2%, and B atoms are distributed in the Pd clusters. The molar ratio of B to Pd atoms is 0.01-0.2:1, and the average valence of Pd atoms is Pd₂. 1+ -Pd 4+ This catalyst can efficiently mineralize perfluorooctanoic acid and other carboxylic acid perfluorinated compounds in water through a chain reaction of decarboxylation coupled with hydroxylation and defluorination under normal temperature and pressure. The defluorination rate exceeds 95%, and its activity is not affected by environmental factors such as ions, dissolved organic matter, and pH in the water. The catalyst is suitable for the removal of perfluorocarboxylic acids from surface water, groundwater, or industrial wastewater, and has the advantages of simple operation, high efficiency, and good stability.

The application relates to the technical field of hydrogen energy equipment safety, and discloses a hydrogen storage container leakage detection device.The device comprises a sealed shell assembly, a gas detection device, an alarm and a position detection assembly.The sealed shell assembly is composed of a first bottle body sealing plate and a second bottle body sealing plate, is internally provided with a high-pressure hydrogen storage cylinder, and is separated into a top groove and a bottom groove by a sealing limiting ring.The gas detection device actively samples and detects the gas in the sealed shell through a gas suction pump and a hydrogen sensor, and triggers the alarm.The position detection assembly comprises a palladium oxide test paper attached to the inner wall of the shell and a water spraying assembly.When leakage is detected, the water spraying assembly sprays water to activate the color development reaction of the palladium oxide test paper to accurately locate the leakage point, and cooling and explosion prevention are simultaneously achieved.The application solves the problems of inaccurate leakage point positioning, low detection efficiency and lack of active safety measures in the prior art.

The invention discloses an electroplating palladium redistribution layer-chemical nickel and gold plating convex block structure and a manufacturing method thereof, and relates to the technical field of semiconductor manufacturing, in particular to the electroplating palladium redistribution layer-chemical nickel and gold plating convex block structure and the manufacturing method of the electroplating palladium redistribution layer-chemical nickel and gold plating convex block structure. Comprising a wafer, an aluminum pad conducting layer, an insulating layer, a first sputtering UBM titanium tungsten layer, a first sputtering UBM gold layer, an electroplating palladium rewiring layer, a polyimide layer, a second sputtering UBM titanium tungsten layer, a second sputtering UBM gold layer, a chemical nickel plating layer and a chemical gold plating layer which are arranged from bottom to top. According to the invention, palladium has more stable chemical characteristics, and copper is easier to oxidize than palladium in a normal temperature environment. The melting point of the palladium material is higher than that of copper, the palladium material is more stable in a high-temperature process, and circuit failure caused by copper migration can be avoided.

The invention relates to the technical field of hydrogen energy storage and transportation, in particular to a vehicle-mounted liquid hydrogen cylinder which comprises a welded heat insulation gas cylinder body, a valve pipeline safety system, a fixed support and an interlayer supporting structure. The welded heat insulation gas cylinder body is composed of an inner container, a shell and a high-vacuum multi-layer heat insulation interlayer formed between the inner container and the shell. The interlayer supporting structure is arranged at the two ends of the gas cylinder body, one end is a fixed end, the degree of freedom of the interlayer supporting structure is completely restrained, all pipelines penetrate out of the end, and the other end is a movable end and can slide in the axial direction of the gas cylinder so as to compensate thermal shrinkage deformation of the inner container. An adsorbent is arranged in the high-vacuum multi-layer heat insulation interlayer and comprises a molecular sieve and palladium oxide; the valve pipeline safety system comprises an emptying pipeline, and the emptying pipeline is provided with a main safety valve and an auxiliary safety valve. The device can realize high hydrogen storage density, low evaporation rate and high safety, and is adaptive to a commercial vehicle platform.

The invention relates to a diesel particulate trapping catalyst with an irregular zigzag coating and a preparation method of the diesel particulate trapping catalyst, the diesel particulate trapping catalyst is characterized in that the zigzag coating is loaded on a DPF carrier, and the zigzag coating is prepared by coating the air inlet side wall surface of the DPF carrier with slurry or solution containing aluminum and precious metal. Then metal oxide crystals are promoted to grow and anchored on the outer wall of a DPF carrier air inlet side pore channel under a specific heat treatment condition; the noble metal is platinum or platinum and palladium; the metal oxide is an aluminum oxide and a platinum oxide, or an aluminum oxide, a platinum oxide and a palladium oxide, and the sum of single platinum or platinum and palladium oxides accounts for 0.2-5 wt.% of the total amount of the whole coating oxide. The catalyst provided by the invention can realize rapid sedimentation of soot particles and improve the trapping efficiency, and active noble metals are dispersed on the irregular zigzag coating, so that the dual problems of excessive PN emission and insufficient passive regeneration efficiency of a catalytic diesel particulate filter are well solved.

A Pd@PdO / CaSiO3@g-C3N4 nanocomposite material includes spherical metal oxide nanoparticles, including a palladium@palladium oxide (Pd@PdO) phase and a calcium silicate (CaSiO3) phase dispersed on a matrix of graphitic carbon nitride (g-C3N4) nanosheets. The spherical metal oxide nanoparticles have an average particle diameter in a range from 25 to 250 nanometers (nm). The Pd@PdO / CaSiO3@g-C3N4 nanocomposite material has a Brunauer-Emmett-Teller (BET) surface area of at least 45 square meters per gram (m2·g−1). A method of preparing the nanocomposite material includes forming CaSiO3, g-C3N4, and Pd@PdO intermediates and combining in a microwave reaction to form the Pd@PdO / CaSiO3@g-C3N4 nanocomposite material.

The application discloses a preparation method of a copper-palladium bimetallic catalyst and application of the catalyst, and the catalyst is prepared by a hydrothermal method and takes silica as a carrier and a copper-palladium composite metal oxide as an active component. The copper-palladium composite metal oxide is loaded on the surface of the silica in the form of nanometer small balls, and through the synergistic effect of the copper-palladium oxide, high conversion rate and high selectivity of bimorpholine diethyl ether synthesis are realized. The method has simple steps, is environment-friendly, and has a wide market application prospect.

The invention discloses a preparation method of a graphite flake loaded palladium ruthenium platinum hydrogen evolution catalyst. The preparation method comprises the following steps: weighing ruthenium oxide trihydrate and anhydrous palladium oxide according to a molar ratio of Ru to Pd of (10-5): 1, mixing, grinding, adding a certain amount of graphite, fully grinding, pressing into a small wafer, calcining the small wafer in a muffle furnace in an air atmosphere at 500-800 DEG C for 1-3 hours to obtain a precursor A, transferring a certain amount of the precursor A into an H2PtCl6 solution, and carrying out vacuum drying to obtain the catalyst. The preparation method comprises the following steps: adding palladium, ruthenium and platinum into a reaction kettle to form a turbid liquid, heating the obtained turbid liquid in a closed reaction kettle at 160-200 DEG C for 5-10 hours to complete a hydrothermal process, and carrying out suction filtration and drying to obtain the graphite flake supported palladium, ruthenium and platinum hydrogen evolution catalyst. The prepared catalyst is used for catalytic hydrogen production, the hydrogen evolution overpotential under the current density of-50 mA cm <-2 > is low, the excellent hydrogen evolution catalytic property is shown, and the potential commercial application prospect is achieved.

The application belongs to the technical field of resources and environment, and particularly relates to a supported bimetallic catalyst for catalytic oxidation of toluene, a preparation method and application thereof. The catalyst takes gamma-Al2O3 and / or Y type molecular sieve as a carrier, and supports palladium oxide and nickel oxide as active components. The mass percentage of palladium is 0wt%-0.07wt%, the mass percentage of nickel is 1wt%-5wt%, and the atomic molar ratio of Pd to Ni is 0:1-1:700. The catalyst is prepared by a co-impregnation method, including steps of carrier pretreatment, impregnation, washing, drying and calcination. Through the synergistic effect of Pd and Ni and the specific carrier matching, the catalyst is particularly suitable for deep oxidation removal of toluene, can realize efficient complete conversion of toluene at a low temperature window of 170-300 DEG C under the condition of photo-thermal synergy, has high carbon dioxide selectivity (>=90%), and effectively inhibits the generation of toxic intermediate products. The catalyst has low cost, high activity and good stability, and has good application prospect in the field of industrial waste gas purification.

The application provides a catalyst for acrylonitrile absorption tower tail gas treatment and a preparation method and application thereof, and the catalyst comprises 80-97 parts by mass of a metal skeleton carrier, 0.5-1 part by mass of an active component, 5-10 parts by mass of an additive and 0.2-0.5 part by mass of a hydrothermal stability material; wherein the active component is at least one of platinum oxide and palladium oxide; the additive is at least one of titanium oxide, vanadium oxide, chromium oxide, manganese oxide, cobalt oxide, nickel oxide, copper oxide and rare earth metal oxide; and the hydrothermal stability material is magnesium-aluminum spinel. The catalyst has excellent activity and stability.

The invention relates to a method for detecting aflatoxin B1 in edible oil. The method comprises the following steps: 1) preparing PdO nano-enzyme particles by taking palladium nitrate as a raw material; 2) drawing an aflatoxin B1 standard curve and obtaining a linear equation; (3) extracting aflatoxin B1 in to-be-detected edible oil, and preparing to-be-detected liquid; 4) replacing the aflatoxin B1 standard solution with the to-be-measured solution, and measuring the absorbance value of the to-be-measured solution at 652 nm; and 5) substituting the absorbance value into a linear equation, and calculating the concentration of aflatoxin B1 brought into the edible oil to be detected. According to the detection method, the aflatoxin B1 in the edible oil can be rapidly and efficiently detected, and meanwhile, the preparation method of the palladium oxide nano-enzyme particles is simple, low in cost, high in stability, environmentally friendly and suitable for large-scale preparation. In the detection process, the dosage of the required nano enzyme is small, the detection sensitivity is high, the response time is short, and the detection time is greatly shortened.

The present invention provides an exhaust gas purification catalyst having an excellent purification performance for purifying chemically stable methane. A catalyst material 30 includes a carrier 32 formed of alumina and a catalyst 34 formed of at least one of palladium and a palladium oxide directly supported on the carrier 32. A specific surface area of the carrier 32 is preferably 20 m2 / g or more 90 m2 / g or less. In one preferred aspect, a proportion of Pd(100) and PdO(101) in crystal planes of the catalyst 34 at a joint surface between the catalyst 34 and the carrier 32 is 20 number % or more.

The invention provides a bimetal phenol hydrogenation catalyst and a preparation method thereof.The preparation method comprises the steps that aluminum oxide with the high surface area is obtained to serve as a carrier, and the carrier is pretreated; preparing a precursor solution containing palladium and ruthenium; the pretreated carrier is soaked in the precursor solution; drying and calcining the impregnated carrier to obtain an intermediate product containing palladium oxide and ruthenium oxide; and activating the intermediate product in a hydrogen atmosphere to generate the phenol hydrogenation catalyst with the bimetallic active component.

This invention discloses a method for preparing supported palladium nanocatalysts and their applications. The method includes: Step 1, adding an aqueous precursor solution containing sulfite ions to an aqueous precursor solution containing a soluble Pd salt to carry out a complexation reaction, thereby obtaining [Pd(SO3)4]. 6‑ Step 1: Add an alkaline aqueous solution to the reaction system of Step 1, causing the complex to precipitate as a white precipitate. Step 2: Wash the white precipitate and react it with H2O2 to obtain a palladium oxide colloidal dispersion. Step 4: Add a support to the colloidal dispersion for impregnation and adsorption, followed by centrifugation, washing, drying, and calcination in a reducing atmosphere to obtain the supported palladium nanocatalyst. The catalyst prepared by this invention avoids the adsorption and poisoning of organic impurities on the catalyst surface, exhibits high catalyst activity, can operate for a long time without agglomeration or decay, and demonstrates good catalyst stability.

The application belongs to the technical field of photocatalytic materials, and discloses a S-type titanium dioxide-palladium oxide-cuprous oxide composite material and a preparation method and application thereof. First, a titanium source is added into ethylene glycol, and a titanium dioxide precursor is prepared through a reflux reaction; second, the titanium dioxide precursor, a palladium salt solution and water are mixed, and a titanium dioxide-palladium oxide composite material is prepared through calcination; finally, the titanium dioxide-palladium oxide composite material, a copper salt solution and water are mixed and subjected to oil bath stirring, and then a sodium hydroxide solution and an ascorbic acid solution are added in sequence and subjected to stirring reaction, so that the S-type titanium dioxide-palladium oxide-cuprous oxide composite material is finally obtained. In the application, cuprous oxide nanoparticles and palladium oxide nanoparticles are loaded on the surface of titanium dioxide microrods, and an S-type heterojunction is successfully constructed between TiO2 and Cu2O, so that the obtained composite material exhibits good photocatalytic performance under light, and is suitable for popularization and application.

The invention relates to the technical field of hydrogen energy equipment safety, and discloses a hydrogen storage container leakage detection device. The device comprises a sealed shell assembly, a gas detection device, an alarm and a position detection assembly. The sealing shell assembly is formed by hinging a first bottle body sealing plate and a second bottle body sealing plate, a high-pressure hydrogen storage bottle is arranged in the sealing shell assembly, and a bottle body area is divided into a top groove and a bottom groove through a sealing limiting ring. The gas detection device actively samples and detects gas in the sealed shell through a sucking pump and a hydrogen sensor, and the alarm is triggered to give an alarm. The position detection assembly comprises palladium oxide test paper attached to the inner wall of the shell and a water spraying assembly, when leakage is detected, the water spraying assembly sprays water to activate the color development reaction of the palladium oxide test paper so as to accurately position a leakage point, and meanwhile cooling and explosion prevention are achieved. The problems of inaccurate leakage point positioning, low detection efficiency and lack of active safety measures in the prior art are solved.

The present application relates to the technical field of palladium recovery, and particularly discloses a method for efficiently recovering palladium from waste palladium / resin catalysts, which can achieve the following effects through the steps of oxygen-rich roasting, vacuum roasting, and synergistic oxidative leaching: under the condition of oxygen enrichment, the decomposition and combustion of high-molecular organic matter are accelerated, and the decomposition rate of the resin carrier is improved; under conventional roasting conditions, the resin decomposition rate is 70-80% in 1-2 hours, and after oxygen is blown in, the organic matter decomposition rate is increased to 85-95%, which is conducive to the subsequent leaching of palladium; meanwhile, the required roasting temperature is reduced, and efficient decomposition of organic matter can be achieved at 500-650 DEG C; through vacuum roasting, palladium oxide is reduced under high-temperature conditions, thereby shortening the reduction process and improving the efficiency; through the synergistic leaching of hydrochloric acid+hydrogen peroxide+ozone, the leaching rate is improved; through the ozone oxidation of divalent palladium in the solution, the system is more environmentally friendly than nitric acid and chlorine systems, and pollution is reduced.