Method for preparing zeolite molecular film reactor coating carried noble metal

A technology of zeolite molecular sieve membrane and zeolite molecular sieve, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of application limitations, small specific surface area of ​​precious metal catalysts, etc., and achieve convenient operation, good catalytic activity, The effect of simple process

Active Publication Date: 2008-03-26
BINHAI IND RES INST OF TIANJIN UNIV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In practical applications, noble metal catalysts such as Pd, Pt, etc. have good catalytic performance, and are widely used in reactions such as hydrogenation, oxidation, cracking, and isomerization. Due to the small specific surface area of ​​noble metal catalysts, their application is limited to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] Step 1, soak the stainless steel reaction tube (inner diameter 2mm, length 900mm) with acetone (analytical purity 99.5%) for 30min, remove impurities such as oil stains on the inner surface of the tube, and clean the inner wall of the tube twice with deionized water. Inject hydrochloric acid with a mass concentration of 30% into the stainless steel tube, and let it stay for 20 minutes to discharge. Wash the inner wall of the tube with deionized water for 3 times until the inner surface of the tube is clean and free of acid residue, and dry it at 25°C for later use.

[0020] In step 2, 38.4 g of tetraethyl orthosilicate (TEOS), 32.2 g of ethanol, 20 g of deionized water and 1.5 g of nitric acid (65% mass fraction) were added into a three-necked flask. The three-necked flask was placed in a water bath at 60° C. and stirred and mixed at 120 r / min for 2 h. Made into adhesive for use.

[0021] In step 3, 30g of HZSM-5 molecular sieve with an average particle size of 1-5 μm...

example 2

[0029] Steps 1-5 are the same as steps 1-5 in Example 1.

[0030] Step 6, inject the sensitization solution prepared in step 5 into the stainless steel tube with HZSM-5 molecular sieve membrane in step 4, sensitize for 5 minutes, and clean the stainless steel tube twice with deionized water; then inject the activation solution prepared in step 5 into the stainless steel tube In the tube, activate for 5 minutes, wash the stainless steel tube twice with deionized water, and repeat the sensitization and activation for 6 times.

[0031] Step 7, take 0.1gPdCl 2 Pour it into a 100mL beaker, add 2mL of HCl acid or ammonia water and stir it with a glass rod to dissolve it, take 5mL of distilled water and add it to the beaker to dilute until the solution is light pink, then add 1.0g of complexing agent Na 2 EDTA, measured with NH under pH meter 4 OH (25%-28% mass fraction) and deionized water to adjust the pH, so that when the solution volume reaches 50 mL, the pH=10. This gives the m...

example 3

[0035] Steps 1-5 are the same as steps 1-5 in Example 1.

[0036] Step 6, inject the sensitization solution prepared in step 5 into the stainless steel tube with HZSM-5 molecular sieve membrane in step 4, sensitize for 5 minutes, and clean the stainless steel tube twice with deionized water; then inject the activation solution prepared in step 5 into the stainless steel tube In the tube, activate for 5 minutes, wash the stainless steel tube with deionized water twice, and repeat the sensitization and activation for 8 times.

[0037] Step 7, take 0.1gPdCl 2 Pour it into a 100mL beaker, add 2mL of HCl acid or ammonia water and stir it with a glass rod to dissolve it, take 5mL of distilled water and add it to the beaker to dilute until the solution is light pink, then add 1.0g of complexing agent Na 2 EDTA, measured with NH under pH meter 4 OH (25%-28% mass fraction) and deionized water to adjust the pH, so that when the solution volume reaches 50 mL, the pH=11. This gives the...

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PUM

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Abstract

The present invention discloses a preparation method of zeolite molecular sieve membrane reactor coated with noble metal. Said preparation method includes the following steps: stainless steel tube treatment, preparing binding agent, preparing coating liquor, utilizing gas auxiliary coating technique to obtain the stainless steel tube coated with zeolite molecular sieve membrane, using tin dichloride, hydrochloric acid and deionized water to prepare sensitizing agent, using palladium chloride or chloroplatinic acid or silver nitrate, hydrochloric acid and deionized water to prepare activating agent, sensitizing and activating the stainless steel tube coated with zeolite molecular sieve membrane, mixing the solution untaining noble metal ions and complexing agent, and using ammonia water and deionized water to regulate pH, injecting plating liquor into the interior of stainless steel tube coated with zeolite molecular sieve membrane, drop-adding reduction agent to make plating, introducing hydrogen gas or nitrogen gas, baking so as to obtain the invented zeolite molecular sieve membrane reactor coated with noble metal.

Description

technical field [0001] The invention relates to a method for preparing a zeolite molecular sieve membrane reactor coated with noble metal, which belongs to the preparation of molecular sieve membrane loaded noble metal coating. Background technique [0002] Molecular sieve membranes not only have the advantages of general inorganic membranes such as high temperature resistance, corrosion resistance, microbial erosion resistance, chemical stability, high strength, no swelling, easy cleaning and regeneration, but also have the characteristics of molecular sieves. The pore size of molecular sieve membrane is uniform and adjustable, and its size is generally between 0.3-1nm, which is similar to the size of ordinary molecules. Therefore, the sieving and separation of different molecules can be realized according to the pore size. At the same time, the silicon-aluminum ratio of molecular sieves can be adjusted, cations can be exchanged by other ions, and Si or Al atoms can be repl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/06B01J29/068
Inventor 张香文赵海龙孟凡旭郭伟邹吉军赵杰
Owner BINHAI IND RES INST OF TIANJIN UNIV CO LTD
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