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Method for chemically plating palladium on surface of porous composite supporting body

A composite support and body surface technology, applied in liquid chemical plating, metal material coating process, coating, etc., can solve the problems of loose metal film structure, waste, and inability to effectively fill potholes, etc., to reduce the difficulty of modification , improve flatness and eliminate film defects

Active Publication Date: 2020-09-22
SINOPEC NANJING RES INST OF CHEM IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this invention, palladium particles for pressure are used to fill the unevenness of the pores on the surface of the support, resulting in a large amount of precious metals and increased costs.
[0009] It can be seen that there are microscopic pores and concave-convex structures on the surface of the porous composite support, which makes it a challenge to form a uniform film on the surface. Although the electroless plating method can form a uniform coating on the surface of the material, it cannot effectively fill the pits and the metal film layer. The structure is relatively loose, so there are technical problems such as unevenness, unevenness, gaps, non-denseness and waste of precious metals in the process of preparing a flat metal film on the surface of porous materials by electroless plating.

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  • Method for chemically plating palladium on surface of porous composite supporting body

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Experimental program
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Effect test

Embodiment 1

[0036] Adopt the present invention to prepare pure palladium film on the porous composite support body surface, comprise the following steps:

[0037] ① The porous composite support used is a composite material composed of porous alumina and yttrium oxide, and the maximum pore size on the surface is 6 μm. The porous composite support was washed with dilute hydrochloric acid and dried.

[0038] ②Molar ratio of PdCl 2 : Mg (NO 3 ) 2 •6H 2 O: Al (NO 3 ) 3 •9H 2 O=0.02:3:1 to prepare 100mL aqueous solution A with a cation concentration of 1mol / L; take NaOH, Na 2 CO 3 Prepare 100 mL of aqueous solution B with an anion concentration of 2 mol / L, add solutions A and B dropwise into 100 mL of deionized water, and keep stirring at 60 °C.

[0039] ③ Aging the above mixture, suction filtering, drying at 120°C, and heat treatment at 500°C for 4 hours to obtain magnesium aluminum hydrotalcite loaded with nano-palladium.

[0040] ④ Mix the above-mentioned palladium-loaded hydrotalcit...

Embodiment 2

[0046] Adopting the present invention to prepare palladium-silver-platinum alloy film on the surface of porous composite support body, comprises the following steps:

[0047] ① The porous composite support used is a composite material composed of porous alumina, zirconia and yttrium oxide, and the maximum pore size on the surface is 10 μm. The porous composite support was washed with dilute hydrochloric acid and dried.

[0048] ②Molar ratio of PdCl 2 : Mg (NO 3 ) 2 •6H 2 O: Al (NO 3 ) 3 •9H 2 O=0.02:3:1 to prepare 100mL aqueous solution A with a cation concentration of 1mol / L; take NaOH, Na 2 CO 3 Prepare 100 mL of aqueous solution B with an anion concentration of 2 mol / L, add solutions A and B dropwise into 100 mL of deionized water, and keep stirring at 60 °C.

[0049] ③ Aging the above mixture, suction filtering, drying at 120°C, and heat treatment at 500°C for 4 hours to obtain magnesium aluminum hydrotalcite loaded with nano-palladium.

[0050] ④ Mix the above-m...

Embodiment 3

[0056] Adopting the present invention to prepare palladium-silver-yttrium alloy film on the surface of porous composite support body, comprises the following steps:

[0057] ① The porous composite support used is a composite material composed of porous alumina, zirconia and yttrium oxide, and the maximum pore size on the surface is 10 μm. The porous composite support was washed with dilute hydrochloric acid and dried.

[0058] ②Molar ratio of PdCl 2 : Mg (NO 3 ) 2 •6H 2 O: Cu (NO 3 ) 2 •3H 2 O: Al (NO 3 ) 3 •9H 2 O=0.02:2.8:0.2:1 to make 100mL aqueous solution A with a cation concentration of 1mol / L; take NaOH, Na 2 CO 3 1. Prepare 100 mL of aqueous solution B with an anion concentration of 2 mol / L in urea, add solutions A and B dropwise into 100 mL of deionized water, and keep stirring at 60°C.

[0059] ③ Aging the above mixture, suction filtering, drying at 120°C, and heat treatment at 500°C for 4 hours to obtain magnesium-aluminum-copper hydrotalcite loaded with...

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Abstract

The invention relates to a method for chemically plating palladium on the surface of a porous composite supporting body. According to the method, a hydrotalcite like compound loaded with palladium nanometer is precoated on the surface of the porous composite supporting body, the surface of the supporting body is smoother, by means of the manner of pre-growing palladium crystal seeds, and smoothness and chemical plating efficiency of a palladium film are improved, and the palladium use amount is reduced. In an ultrasonic environment, the chemical plating method is adopted for depositing a palladium or palladium alloy film on the surface of the porous composite supporting body. In inert gas, heat treatment is carried out on the palladium or palladium alloy film, and thus the uniform compactpalladium or palladium alloy film with long service life is obtained. In the palladium alloy film preparation process, energy consumption is low, the cost is low, the prepared metal film is uniform and compact, and the maintenance cost is low.

Description

technical field [0001] The invention belongs to the field of preparation and application of inorganic membranes, in particular to a method for electroless palladium plating on the surface of a porous composite support. Background technique [0002] Energy and the environment are the two major themes of sustainable development in today's society. As a secondary energy source, hydrogen has many advantages, such as good combustion performance, high efficiency, clean and pollution-free, and does not cause greenhouse effect. In recent years, more and more people believe that hydrogen is the future energy of mankind. [0003] At present, the problems required for the effective utilization of hydrogen energy include: hydrogen production, hydrogen separation and purification, hydrogen storage and transportation, etc. Many by-products are often produced in the process of traditional hydrogen production, such as CO, CO 2 , O 2 、H 2 O, CH 4 and other impurities, and most of the a...

Claims

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Application Information

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IPC IPC(8): C23C18/44C23C18/48C23C18/18
CPCC23C18/44C23C18/48C23C18/1803
Inventor 张楚璠江洋洋孔京黄伟贺向坡
Owner SINOPEC NANJING RES INST OF CHEM IND CO LTD