Preparation method and application of nano-catalytic material having the structure of palladium oxide shell and nickel oxide core
A nano-catalytic material, palladium oxide technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, catalyst activation/preparation, chemical instruments and methods, etc., can solve thermal collapse, insufficient hollow structure strength, reduced efficiency, etc. question
Active Publication Date: 2018-10-23
HUNAN JIANTE TECH CO LTD
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Problems solved by technology
However, during use, it is found that the efficiency decreases after high temperature (1000°C), and thermal collapse may occur due to insufficient strength of the hollow structure
Method used
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Embodiment 1
[0024] Prepare 1000ml of nickel sulfate solution with a concentration of 0.5mol / l, and add complexing agent sodium citrate according to the molar ratio of nickel sulfate / sodium citrate=1:2. Take 500ml of hydrazine hydrate, add a certain amount of NH 3 OH to adjust the pH of the hydrazine hydrate solution to 11. Hydrazine hydrate and NH 3 The OH mixed solution is poured into the nickel sulfate solution and reacted for 5 minutes, so that the hydrazine hydrate reduces the nickel ions, and the metal nickel particles with an average particle diameter of about 200 nm are obtained.
[0025] Prepare 1000ml of palladium nitrate solution with a concentration of 0.2mol / l, add a certain amount of nitric acid to adjust the pH value of the palladium nitrate solution to 3. Under the conditions of room temperature and mechanical stirring, the nano-nickel particles prepared above were washed with deionized water and then added to a palladium nitrate solution for 20 minutes to react to obtain...
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The invention provides a preparation method of a nano-catalytic material having the structure of a palladium oxide shell and a nickel oxide core. In the invention, firstly, nano metal nickel particlesare prepared; then through a replacement reaction to surfaces of nickel ions with palladium ions in a palladium ion solution, the palladium ions are reduced by the metal nickel and are deposited on the surfaces of nickel ions to form a metal palladium coating layer, being nano-scale in thickness, according to the property that the electrode potential of metal palladium is higher than that of metal nickel, thus preparing the nano-metal palladium-nickel composite particles having the structure of palladium shell / nickel core. In glycerol, the nano-metal palladium-nickel composite particles having the structure of palladium shell / nickel core can be oxidized by ozone to prepare the nano-oxide composite particles, which can be used as a motor vehicle exhaust catalyst material and has the structure of palladium oxide shell and nickel oxide core. The nano-noble metal oxide composite particles having the structure of a palladium oxide shell and a nickel oxide core can be used for replacing palladium oxide particles used in a motor vehicle exhaust catalytic purifier.
Description
technical field [0001] The invention provides a method for preparing a nano catalytic material with a palladium oxide shell-nickel oxide core structure, belonging to the field of lighter detection and debugging equipment. technical background [0002] Palladium oxide is a kind of excellent catalytic purification material for motor vehicle exhaust. At present, in the preparation of automobile exhaust catalytic purification materials, a certain amount of palladium salt is added to the slurry prepared by mixing powder coating material and water ball mill (also known as water washing slurry, English washcoat) and coated on the catalyst carrier. (generally honeycomb ceramic carrier or metal honeycomb carrier) the surface of dense small channels, and then the carrier coated with catalyst is heated and baked to shape. During the sintering process, the palladium salt in the slurry is roasted and oxidized to transform into sub-micron or micron-sized palladium oxide particles attache...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B01J23/89B01J37/12B01D53/94
CPCB01D53/94B01J23/002B01J23/892B01J37/12B01J35/398
Inventor 姚小刚刘颖
Owner HUNAN JIANTE TECH CO LTD