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Method for modifying porous substrate and modified porous substrate

A technology for porous substrates and modification methods, applied in the field of modification methods and modified porous substrates, can solve the problems of reduced service life of palladium membranes, reduction of dense palladium membrane thickness, poor adhesion, etc., and achieve good adhesion properties, reducing film thickness

Active Publication Date: 2016-10-05
IND TECH RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the literature, aluminum oxide particles are used to fill the metal porous substrate to make the surface smooth, which can reduce the film thickness required for the obtained dense palladium film and make the surface smooth, but the poor adhesion will lead to the service life of the palladium film. Shortcomings such as reduction and poor hydrogen purification effect

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  • Method for modifying porous substrate and modified porous substrate

Examples

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Effect test

Embodiment 1

[0028] The 316 porous stainless steel substrate (hereinafter referred to as 316PSS) was immersed in a + and Al 3+ the alkaline solution for one hour before drying. Contains Li + and Al 3+ The preparation method of the alkaline solution is to grind about 0.1-0.4 grams of AlLi intermetallic compound in a ceramic mortar into powder with a particle size of about 100-1000 μm. In this embodiment, the weight % of Li contained in the AlLi intermetallic compound relative to the total weight of the AlLi intermetallic compound is about 18-21%. Next, the AlLi intermetallic compound powder is placed in 100 mL of pure water, and an inert gas (for example, Ar or N) is introduced 2 ) and after aeration and stirring for several minutes, most of the AlLi intermetallic compound powder reacts with water and dissolves. Next, filter the impurities with filter paper with a pore size of 5A to obtain a clear and Li-containing + and Al 3+ alkaline solution. In this example, Li contains + and A...

Embodiment 2

[0036] The pores on the surface of 316PSS are filled with alumina particles, wherein the average particle size of the alumina particles is 10 μm. Next, by performing the LDH preparation method three times (as described in Example 1), a Li-AlLDH layer was obtained covering the surface of the 316PSS.

[0037]Next, the Li-AlLDH / 316PSS was calcined in a high-temperature furnace with a heating and cooling rate of 3°C / min and nitrogen gas flow. The process temperature was raised to 600°C and then kept at a constant temperature for 12 hours to remove the crystal water, carbonate and hydroxide of the LDH layer, so as to convert the Li-AlLDH layer into an aluminum oxide layer containing lithium. In this example, the obtained aluminum oxide layer Most of the layers have γ-phase, this test piece is referred to as γ-Al 2 O 3 / Al 2 O 3 / 316PSS.

[0038] Next, through the electroless plating preparation method (as described in Example 1), a sample of 316PSS with alumina particles in th...

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Abstract

The invention provides a modifying method for a porous substrate, comprising the steps of: coating at least one metal hydroxide layer on a porous substrate;, and calcining the porous substrate having the metal hydroxide layer to transform the metal hydroxide layer into a metal oxide layer having a continuous phase, and forming a modified porous substrate. The present invention also provides a modified porous substrate.

Description

technical field [0001] The present invention relates to a method for modifying a porous substrate and a modified porous substrate, in particular to a method for modifying a porous substrate that can be applied to separate gases. Background technique [0002] Hydrogen energy has low environmental hazards in use and can be continuously recycled. It is a promising emerging energy in recent years. Steam reforming is the main hydrogen-producing reaction, however, steam reforming is a highly endothermic reaction, which requires a very high reaction temperature to achieve sufficient conversion due to thermodynamic constraints. To achieve 90% methane conversion at a reaction pressure of 1000 kPa and a water / methane ratio of 3, the required reaction temperature is 850 °C. If 90% of the hydrogen can be removed in time in the steam reforming reaction, the required reaction temperature is only 500°C. Palladium or its alloy membrane can be used to separate and purify hydrogen. Palladiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/00B01D53/22
Inventor 林孟昌林育立纪岩勋汪俊延
Owner IND TECH RES INST
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