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Preparation method for low-density foam palladium material

A low-density, foam technology, applied in the field of palladium material preparation, can solve the problems of serious environmental pollution, difficulty in further reducing the bulk density of the material, low density, etc. rate effect

Inactive Publication Date: 2014-03-26
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, there are few reports on the density of bulk materials for the preparation of porous palladium materials. The porous palladium materials prepared by the water-soluble pore-forming agent method have a porosity of 85.3% to 87.8%, and the density is not low enough.
However, the preparation of porous palladium materials by the dealloying method requires the use of corrosive strong acid or strong alkali solutions, which is more serious to environmental pollution, and the porosity of the obtained porous palladium materials will not be higher than 85%, so it is difficult to increase the bulk density of the materials. reduce

Method used

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  • Preparation method for low-density foam palladium material

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Comparison scheme
Effect test

Embodiment 1

[0032] A preparation method for low-density palladium foam material, comprising the following steps:

[0033] (1) Take 0.75ml of a monodisperse PS microsphere aqueous solution with a mass fraction of 10% and a diameter of 10μm produced by Suzhou Nano Microbiology Technology Co., Ltd., disperse the PS microsphere emulsion in 7.5ml of deionized water, and add the aforementioned 10ml of nano-palladium For hydrosol, centrifuge the solution after vigorous stirring;

[0034] (2) After centrifugation, the sample is dispersed in 80ml of deionized water, 1.2ml of 0.4mol / L sodium chloropalladate aqueous solution is added, the solution is centrifuged after vigorous stirring, and the obtained sample is dispersed in 1ml of deionized water, using the aforementioned rheological casting process, The resulting suspension was molded into a polytetrafluoroethylene tube with an inner diameter of 5.0mm, and placed in a 40°C incubator to dry for 24 hours;

[0035] (3) After the sample is completel...

Embodiment 2

[0038] A preparation method for low-density palladium foam material, comprising the following steps:

[0039] (1) Take 0.75ml of monodisperse PS microsphere aqueous solution with a mass fraction of 10% and a diameter of 10 μm, disperse the PS microsphere emulsion in 7.5ml deionized water, add 10ml nano-palladium hydrosol, and centrifuge the solution after vigorous stirring separation;

[0040] (2) After centrifugation, the sample is dispersed in 80ml deionized water, and 0.4mol / L palladium chloride is added

[0041] 0.6ml of sodium bicarbonate aqueous solution, centrifuge the solution after vigorous stirring, disperse the obtained sample in 1ml of deionized water, mold the obtained suspension into a polytetrafluoroethylene tube with an inner diameter of 5.0mm, and place it in a 40°C incubator Dry for 24 hours;

[0042] (3) After the sample is completely dried, it is removed from the mold, and placed in a tube furnace for sintering, and the temperature is slowly raised to 400...

Embodiment 3

[0045] A preparation method for low-density palladium foam material, comprising the following steps:

[0046] (1) Take 0.75ml of a monodisperse PS microsphere emulsion with a mass fraction of 10% and a diameter of 1.0 μm, disperse the PS microsphere emulsion in 7.5ml of deionized water, add 10ml of nano-palladium hydrosol, and stir the solution vigorously centrifugal separation;

[0047] (2) After centrifugation, the sample is dispersed in 80ml deionized water, and 0.4mol / L palladium chloride is added

[0048] 0.5ml sodium bicarbonate aqueous solution, centrifuge the solution after vigorous stirring, disperse the obtained sample in 1ml deionized water, mold the obtained suspension into a polytetrafluoroethylene tube with an inner diameter of 5.0mm, and place it in a 40°C incubator to dry 24 hours;

[0049] (3) After the sample is completely dried, it is removed from the mold, and placed in a tube furnace for sintering, and the temperature is slowly raised to 400°C at 2°C / min...

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Abstract

The invention discloses a preparation method for a low-density foam palladium material. The preparation method is characterized by comprising the following steps: adopting sodium tetrachloropalladate(II) as palladium resources to prepare nano-palladium hydrosol; taking polystyrene microsphere with negative charges on the surface as a template to prepare a polystyrene microsphere aqueous solution with palladium plated on the surface; preparing a polystyrene microsphere suspending liquid with palladium particles coated on the surface; adopting a rheocasting method to pour the palladium plated polystyrene microsphere suspending liquid into a mould for moulding, drying and demoulding to prepare a palladium plated polystyrene microsphere block material; calcining at the temperature of 300-500 DEG C for 6-24 h to obtain the low-density foam palladium material. The low-density foam palladium material prepared by the preparation method has the volume density which can be as low as 0.42 g / cm<3>, the specific surface area reaches 18.5 m<2> / g, the poriness and microstructure are uniform and adjustable, and a certain mechanical strength is achieved; the low-density foam palladium material is suitable for the fields of catalyzing, sensing, heat change and the like, and can also be applied to the fields of storage, purifying, separation and the like of hydrogen isotope.

Description

technical field [0001] The invention belongs to the preparation of palladium materials, and relates to a method for preparing low-density foamed palladium materials. The low-density foamed palladium material prepared by the invention is suitable for the fields of catalysis, sensing, heat exchange, etc., and can also be used in the fields of storage, purification, separation of hydrogen isotopes, and the like. Background technique [0002] It is well known that Pt and Pd series noble metal catalysts have excellent catalytic activity and have huge potential application value in the catalytic industry. In industrial applications, Pt and Pd nanopowders are often directly used as catalysts. Due to the surface effect of the metal nanopowders themselves, it is easy to cause agglomeration and agglomeration during use, reducing the permeability of gas or liquid media, thereby making them Loss of catalytic activity, this process is a common catalytic poisoning phenomenon in industry....

Claims

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Application Information

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IPC IPC(8): C22C1/08C22C5/04
Inventor 张魁宝黄毅马雪吴浪李玉香滕元成
Owner SOUTHWEAT UNIV OF SCI & TECH
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