10 results about "Palladium alloy" patented technology

The invention discloses a preparation method of a copper-palladium alloy loaded nano titanium dioxide semiconductor material as a catalyst for a carbon dioxide reduction reaction. Firstly, alloy nanoparticles are generated through a sol-gel method, the morphology of the nanoparticles is controlled and agglomeration is prevented through oleylamine and oleic acid, and borane-tert-butylamine is added at the temperature of 170 DEG C to regulate and control the sizes of the generated alloy nanoparticles. A series of characterizations prove that the catalyst has a very good particle loading condition, uniform particle distribution and increased reaction active sites, and shows excellent activity when being applied to a carbon dioxide reduction reaction, when the loading capacities of copper and palladium are respectively 1%, the activity of the obtained catalyst is the highest, the methane generation rate can reach 20.23 mol / g / h, and the methane generation rate can reach 20.23 mol / g / h. The selectivity of methane reaches 100%.

The invention relates to a catalyst system for flow reactors, said catalyst system being characterized by the order of the noble metal-containing alloys used in the catalyst gauze which forms the catalyst system. By using a ternary platinum alloy for a second catalyst gauze group and a palladium alloy for a third catalyst gauze group, the platinum and rhodium content of the catalyst system can be kept relatively low overall while having a high degree of efficiency. The invention additionally relates to a method for catalytically combusting ammonia, in which a fresh gas which contains at least ammonia is conducted through a catalyst system.

The application provides a preparation method of low-resistance flaky silver-palladium alloy powder and conductive paste, and belongs to the field of preparation of precious metal powder materials. The preparation method of low-resistance flaky silver-palladium alloy powder comprises the following steps: (1) mixing a silver salt solution, a palladium salt solution and a reducing agent solution to perform a reduction reaction, so as to obtain silver-palladium alloy powder; (2) mixing the silver-palladium alloy powder, a dispersion liquid and a ball-milling dispersant, and then performing ball-milling, so as to obtain flaky silver-palladium alloy powder; the milling balls used in the ball-milling include one or more of steel balls, zirconium dioxide balls and agate balls. The flaky silver-palladium alloy powder is prepared by adopting the mode of "alloying first and then ball-milling", the two key links of "alloying" and "flaky" can be independently optimized, the uniformity and the controllability of the morphology of the powder are improved at the atomic level, the prepared flaky silver-palladium alloy powder has good dispersibility and a smooth surface, and has a resistance superior to that of spherical alloy powder, spherical mixed powder and flaky mixed powder.

This invention relates to the field of hydrogen production technology and discloses a hydrogen production device and method using low-temperature, high-pressure ammonia cracking coupled with palladium membrane purification. The device includes a container-type enclosure containing a liquid ammonia storage tank, a liquid ammonia vaporizer, a high-pressure cracking reactor, thermally coupled connecting pipelines, and a palladium alloy membrane separator, all connected in sequence. The high-pressure cracking reactor is equipped with fireproof bricks, with a furnace liner embedded inside each fireproof brick. Heating strips are attached to the outside of the fireproof bricks. The rated operating pressure of the device is 0.8–1.5 MPa, and the reaction temperature is 450–560 °C. It is used to catalytically crack ammonia into a mixed gas containing H2 and N2. This low-temperature, high-pressure ammonia cracking coupled with palladium membrane purification hydrogen production device and method achieves direct thermal coupling between the cracking unit and the membrane separation unit through specific parameter matching, eliminating the need for intermediate cooling and pressurization equipment. This significantly reduces energy consumption and system volume while obtaining high-purity hydrogen with a purity of not less than 7N (99.99999%).

The application relates to the technical field of water electrolysis catalyst materials, and discloses an acetylene black loaded iridium-palladium alloy catalyst as well as a preparation method, application and device thereof. The preparation method comprises the following steps: acid treatment of acetylene black with a nitric acid solution, washing until neutral, and then dispersing in an alcohol solvent to obtain an acetylene black suspension; mixing an iridium precursor and a palladium precursor, adding the suspension under ultrasonic assistance, and stirring and adsorbing; cooling the obtained mixture to 0-5 DEG C, quickly adding a sodium borohydride solution for a reduction reaction, and then continuing the reaction after the temperature is increased to room temperature; and finally filtering, washing and drying. The obtained catalyst has the advantages of small particle size (2-5 nm), high alloy uniformity (atomic level distribution), excellent catalytic performance (eta 10 = 278 mV) and good stability (100h attenuation < 5%), significantly reduces the iridium consumption and the catalyst cost, and is suitable for a PEM water electrolysis hydrogen production system.

The application relates to the technical field of power semiconductor chip manufacturing, and particularly discloses a preparation method of a power semiconductor chip surface metal layer, which comprises the following steps: taking SiC or GaN as a substrate, carrying out surface cleaning, plasma etching and interface modification pretreatment, sequentially adopting magnetron sputtering to prepare a titanium-tantalum alloy transition layer, adopting cyanide-free electroplating to prepare a silver-copper-tin alloy main body layer, adopting electron beam evaporation to prepare a gold-palladium alloy oxidation-resistant protective layer, and then carrying out segmented collaborative annealing and post-treatment detection to obtain a finished product. Through the combination of interface modification and layered alloy preparation, the application improves the bonding strength of the metal layer and the substrate, optimizes the electric conduction and heat conduction performance, is environmentally friendly in the cyanide-free process, solves the pain points of the prior art, adapts to the demand of high-voltage and high-current chips, and is high in reliability.

This invention discloses a ternary composite asymmetric nanoparticle, its preparation method, and its applications. It belongs to the field of nanomaterials. This composite nanomaterial uses a gold bipyramidal nanoparticle as a substrate, with spherical silver-palladium alloys selectively grown at one end of the gold bipyramidal nanoparticle. The other tip is uncoated and resembles a dart. The preparation method of this ternary nanoparticle combines galvanic substitution reaction, co-reduction reaction, and Oswald ripening effect. This Au-AgPd ternary composite asymmetric nanoparticle exhibits diverse physicochemical properties, high purity, and strong controllability. The Au-AgPd nanoparticle possesses three characteristics: superior near-infrared II photothermal conversion performance; effective catalysis of hydrogen peroxide to generate reactive oxygen species; and easy loading of various functional molecules onto the exposed end of the gold bipyramidal nanoparticle. These three unique properties of the Au-AgPd nanoparticle enable its application in near-infrared II photothermal-catalytic combined therapy of tumor cells.

This utility model relates to a multifunctional composite coated glass cover and a display module containing the same, comprising a glass substrate and composite coated structures on its front and back sides. The front coated structure, from the outside to the inside, comprises: a gold-palladium alloy layer (5-10 nm thick); a chromium-nickel alloy layer (10-20 nm thick); and a samarium oxide coating layer (5-10 nm thick). The back coated structure, from the outside to the inside, comprises: a photosensitive color-changing ink screen printing layer (4-5 μm thick, containing a polymer matrix with spiropyran derivatives); a titanium oxide layer (10-20 nm thick, with an anatase crystal structure); and a titanium-aluminum alloy layer (20-30 nm thick). The glass cover has asymmetrically arranged snap-fit ​​grooves at the center of each of its four opposite sides. The snap-fit ​​grooves have an inverted "L" shaped cross-section. Correspondingly, the backlight portion of the display module has snap-fits. During assembly, the snap-fit ​​grooves and snap-fits cooperate to form an assembly.

The application discloses an inner heat type palladium membrane purifier, which comprises an outer shell and an inner shell, a heat preservation layer is filled between the outer shell and the inner shell, the inner shell comprises a diffusion chamber and a preheating chamber, the palladium membrane purifier further comprises a heating pipe which is inserted into the diffusion chamber, the heating pipe is internally provided with an electric heating element, a palladium alloy pipe is spirally wound outside the heating pipe, one end of the diffusion chamber is provided with an end face flange, the end face flange is provided with a pure hydrogen interface and a tail gas interface, the pure hydrogen interface is communicated with the diffusion chamber and the outside of the outer shell, the tail gas interface is connected with one end of the palladium alloy pipe, the other end of the palladium alloy pipe is connected with a raw material gas preheating coil pipe, the other end of the preheating coil pipe is extended out of the outer shell and is provided with a raw material hydrogen interface, and the palladium membrane purifier further comprises a temperature measuring sleeve pipe. The hydrogen purifier disclosed by the application has the advantages of compact layout, small device volume, few welding points of a palladium membrane assembly, reliable process, long service life, uniform heating temperature of the device, small heat loss, high purification and separation efficiency of hydrogen, and large gas processing capacity per unit volume.