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A method for preparing palladium membrane on the surface of macroporous carrier

A macroporous carrier and porous carrier technology, applied in separation methods, chemical instruments and methods, membrane technology, etc., can solve problems such as hydrogen resistance, and achieve the effects of avoiding resistance, easy operation, and simple methods

Active Publication Date: 2017-08-25
LIAONING UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the carrier modification material exists in the palladium composite membrane, which will produce certain resistance to the transmission of hydrogen in the palladium composite membrane (Journal of Membrane Science, 2010,362:241-248)

Method used

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  • A method for preparing palladium membrane on the surface of macroporous carrier
  • A method for preparing palladium membrane on the surface of macroporous carrier
  • A method for preparing palladium membrane on the surface of macroporous carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Preparation of polyvinyl alcohol (PVA) sol

[0025] Dilute a certain amount of concentrated nitric acid with deionized water into a 0.05mol / L nitric acid aqueous solution, mix polyvinyl alcohol and the above nitric acid aqueous solution according to a solid-to-liquid ratio of 1:30 (g / mL), pour it into a three-necked flask and stir at high speed , with a stirring rate of 500rpm, and kept in a constant temperature water bath at 90°C for 2 hours to completely dissolve the polyvinyl alcohol, leave it to stand, and cool down naturally to obtain a PVA sol;

[0026] 2) PVA modified macroporous carrier surface

[0027] Such as figure 1 As shown, the porous ceramic carrier with a pore size of 3 μm was vertically immersed in the PVA sol obtained in step 1) for 1 second, then quickly pulled out, and dried with a hair dryer or naturally dried at room temperature. This process was repeated twice to obtain a surface Flat and smooth modified carrier, SEM image of the surface of t...

Embodiment 2

[0033] 1) Preparation of polyvinyl alcohol (PVA) sol

[0034] Dilute a certain amount of concentrated nitric acid with deionized water into a 0.02mol / L nitric acid aqueous solution, mix polyvinyl alcohol and the above nitric acid aqueous solution according to a solid-to-liquid ratio of 1:100 (g / mL), pour it into a three-necked flask and stir at high speed , with a stirring rate of 200rpm, and kept in a constant temperature water bath at 50°C for 6 hours to completely dissolve the polyvinyl alcohol, let it stand, and naturally cool down to obtain a PVA sol;

[0035] 2) PVA modified macroporous carrier surface

[0036] The porous stainless steel carrier with a pore size of 10 μm was vertically immersed in the PVA sol obtained in step 1) for 10 seconds, then quickly pulled out, and dried with a hair dryer or dried naturally at room temperature. This process was repeated 5 times to obtain a flat and smooth surface. modified carrier;

[0037] 3) The preparation process of the pal...

Embodiment 3

[0041] 1) Preparation of polyvinyl alcohol (PVA) sol

[0042]Dilute a certain amount of concentrated nitric acid with deionized water into a 0.1mol / L nitric acid aqueous solution, mix polyvinyl alcohol and the above nitric acid aqueous solution according to a solid-to-liquid ratio of 1:60 (g / mL), pour it into a three-necked flask and stir at high speed , with a stirring rate of 300rpm, and kept in a constant temperature water bath at 70°C for 4 hours to completely dissolve the polyvinyl alcohol, let it stand, and naturally cool down to obtain a PVA sol;

[0043] 2) PVA modified macroporous carrier surface

[0044] Vertically immerse the porous glass carrier with a pore size of 0.5 μm in the PVA sol obtained in step 1) for 5 seconds, then pull it out quickly, and dry it with a hair dryer or dry it naturally at room temperature. This process is repeated 3 times to obtain a flat and smooth surface. Modified carrier;

[0045] 3) the preparation process of palladium membrane is t...

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Abstract

A method for preparing a palladium film on the surface of a macroporous carrier, using a dip coating method to cover a layer of organic modification layer on the surface of the porous carrier, and then using a sensitization-activation method to pre-coat a layer of palladium seed crystals on the surface of the polyvinyl alcohol modification layer , and then prepare a layer of palladium film on the surface of the organic modification layer by electroless plating, and finally remove the organic modification layer in the palladium composite film through high temperature heat treatment under the protection of an inert atmosphere, and obtain a palladium film with good hydrogen permeability. The use of organic materials to modify the porous carrier can not only effectively improve the surface roughness of the carrier and reduce the surface pore size, but also the organic modification layer can be removed by simple heat treatment after the electroless palladium plating film, which avoids the effect of the modification layer on hydrogen transmission. generated resistance. The method is simple, flexible, easy to operate and highly practical.

Description

technical field [0001] The invention belongs to the field of inorganic membrane preparation, in particular to a method for preparing a palladium membrane on the surface of a macroporous carrier. Background technique [0002] In recent years, with the continuous consumption of fossil energy, its reserves are increasingly depleted. Moreover, the use of fossil energy will produce a large amount of pollutants, causing serious pollution to the environment. Therefore, searching for efficient and clean energy has become a hot spot in the current research field. Due to its high combustion calorific value and non-polluting use process, hydrogen has attracted increasing attention from researchers. [0003] The utilization of hydrogen energy is inseparable from the separation and purification of hydrogen. Palladium and its alloy membranes, as hydrogen permeable materials, are widely used in the fields of hydrogen separation and purification because of their unique selectivity to hyd...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D67/00B01D53/22C01B3/50
Inventor 郭宇吴红梅金玉家周立岱陈强强张志华
Owner LIAONING UNIVERSITY OF TECHNOLOGY
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