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Modifying method for 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: 2013-07-03
IND TECH RES INST
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  • Summary
  • 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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  • Modifying method for porous substrate and modified porous substrate

Examples

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Embodiment 1

[0028] The 316 porous stainless steel substrate (hereinafter referred to as 316PSS) was immersed in a Li + and Al 3+ alkaline solution for one hour before drying. Contains Li + and Al 3+ The preparation method of the alkaline solution is as follows: about 0.1-0.4 grams of the AlLi intermetallic compound is ground into a powder with a particle size of about 100-1000 μm in a ceramic mortar. 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, put the AlLi intermetallic compound powder into 100mL of pure water, introduce an inert gas (for example, Ar or N 2 ) and after several minutes of aeration and stirring, most of the AlLi intermetallic compound powder reacted with water and dissolved. Then, filter the impurities with a filter paper with a pore size of 5A to obtain a clear and Li-containing + and Al 3+ alkaline solution. In this example, containing Li ...

Embodiment 2

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

[0037]Then, Li-AlLDH / 316PSS was calcined in a high-temperature furnace with a heating and cooling rate of 3°C / min and nitrogen gas. After the process temperature was increased to 600°C, the temperature was kept constant for 12 hours to remove the crystal water, carbonate and hydroxide in the LDH layer, so as to convert the Li-Al LDH layer into an aluminum oxide layer containing lithium. In this example, the oxide Most of the aluminum layer has a γ phase, and this test piece is subsequently called γ-Al 2 o 3 / Al 2 o 3 / 316PSS.

[0038] Then, by the electroless plating preparation method (as described in Example 1), a sample with aluminum oxide particles in the holes of 316PSS and a γ-Al2O3 laye...

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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 invention relates to a method for modifying a porous substrate and the modified porous substrate, in particular to a method for modifying a porous substrate applicable to gas separation. Background technique [0002] Hydrogen energy has low environmental hazards and can be continuously recycled and utilized. It has become a promising new energy source in recent years. Steam recombination is the main hydrogen production reaction, however, the steam recombination reaction is a highly endothermic reaction, which requires very high reaction temperature to achieve sufficient conversion due to thermodynamic constraints. When the reaction pressure is 1000kPa and the water / methane ratio is 3, the required reaction temperature is 850°C to achieve 90% methane conversion. 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 ...

Claims

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Application Information

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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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