A kind of palladium-based membrane whose surface covers molecular sieve membrane and preparation method thereof

A surface covering and molecular sieve technology, applied in the field of membrane separation, can solve the problems of easy poisoning, inactivation, corrosion and wear of palladium-based hydrogen permeable membranes, and achieve the effect of broad-spectrum resistance to poison erosion and wear resistance

Active Publication Date: 2015-08-12
ZHANGJIAGANG IND TECH RES INST CO LTD DALIAN INST OF CHEM PHYSICS CHINESE ACADEMY OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems that palladium-based hydrogen permeable membranes are prone to poisoning, inactivation, corrosion and wear, and provide a protective method for palladium-based hydrogen permeable membranes

Method used

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  • A kind of palladium-based membrane whose surface covers molecular sieve membrane and preparation method thereof
  • A kind of palladium-based membrane whose surface covers molecular sieve membrane and preparation method thereof
  • A kind of palladium-based membrane whose surface covers molecular sieve membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Aluminum plating: a 1um aluminum film is plated on the surface of the palladium film (12mm in diameter) of the palladium film / porous ceramic support by vacuum sputtering.

[0035] Alloy diffusion: In nitrogen, the temperature is raised to 300°C at a rate of 2°C / min, then switched to hydrogen, and the temperature is raised to 400°C at 1°C / min, kept at a constant temperature for 2 hours, then switched back to nitrogen, and the temperature is naturally lowered.

[0036] Molecular sieve seed crystals were prepared as follows: NaOH (33.0g) and deionized water (189g) were mixed to form NaOH solution, poured into aluminum powder (1.5g), dissolved and filtered to remove impurities, and the silica sol (30wt%, 11.1 g) Slowly drop in, stir at room temperature for 2 hours, then pour the solution into a reaction synthesis kettle, crystallize at 40°C for 17 hours, wash with deionized water after synthesis, centrifuge for 5 times, and dry at 120°C for use.

[0037] The molecular sieve...

Embodiment 2

[0041] Salt corrosion resistance test: the 4A molecular sieve membrane palladium membrane prepared on the surface of the palladium membrane in the above examples was treated in 60°C 0.05M KCl solution for 4h, then cleaned in 90°C deionized water for 2h, and then washed at 400°C Drying under a nitrogen atmosphere shows no increase in nitrogen permeability at room temperature.

Embodiment 3

[0043] The 4A type molecular sieve membrane prepared on the surface of the palladium membrane in the above examples is ion-exchanged into a 3A type molecular sieve membrane, and the process is as follows:

[0044] The palladium membrane with the 4A-type molecular sieve membrane was placed in the 0.05M KCl solution, treated at 60°C for 4h, and then washed in 90°C deionized water for 2h to obtain a palladium membrane covering the 3A-type molecular sieve membrane. This 15mm long 3A type molecular sieve palladium membrane has a nitrogen permeability of 11ml / min at 300°C, which is less than the 40ml / min nitrogen permeability of the reference palladium membrane. The hydrogen permeation data of the 3A molecular sieve palladium membrane at 500°C is shown in the table below, which shows a higher hydrogen permeation rate than the reference original palladium membrane.

[0045]

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PUM

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Abstract

The invention discloses a palladium-based membrane with the surface covered by a molecular sieve membrane and a preparation method thereof. The palladium-based membrane and the preparation method have the advantages that a sliicon-alumininm-based microporous sieve membrane is prepared on the surface of the palladium-based membrane, and by utilizing the characteristic that small molecules of microporous channels of the molecular sieve membrane, the small-molecular hydrogen passes preferentially, and other toxic macromolecules or dusts are blocked, so that the poisoning and the wear of the palladium-based membrane are avoided and the palladium-based membrane is protected. The method disclosed by the invention provides an anti-poisoning and protective measure and can be widely applied.

Description

technical field [0001] The present invention relates to a palladium-based membrane with a surface covered silicon-aluminum-based molecular sieve membrane and a preparation method thereof, in particular to a palladium-based membrane with a three-layer structure of molecular sieve membrane|palladium-based membrane|porous support and a preparation method thereof, which can be used The invention relates to the anti-toxicity, anti-corrosion and anti-abrasion of selective hydrogen-permeable palladium-based membranes, and belongs to the technical field of membrane separation. Background technique [0002] Hydrogen is an indispensable basic raw material for many industrial processes, and as a clean energy carrier in the future, it also carries human’s hope for a green earth. The separation and purification of hydrogen has always been a research hotspot in the industrial and academic circles of various countries. Traditional technologies such as pressure swing adsorption (PSA) adopt ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D69/12B01D67/00C01B39/14
Inventor 李春林徐恒泳侯守福
Owner ZHANGJIAGANG IND TECH RES INST CO LTD DALIAN INST OF CHEM PHYSICS CHINESE ACADEMY OF SCI
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