Method for producing zeolite molecular sieve film carrier noble metal catalyst

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

Active Publication Date: 2009-01-28
TIANJIN UNIV
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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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  • Method for producing zeolite molecular sieve film carrier noble metal catalyst
  • Method for producing zeolite molecular sieve film carrier noble metal catalyst
  • Method for producing zeolite molecular sieve film carrier noble metal catalyst

Examples

Experimental program
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Effect test

example 1

[0021] Step 1, immerse the stainless steel sheet (25×60mm) in hydrochloric acid with a mass concentration of 25% for surface treatment, and soak for 4 hours. Take out the stainless steel sheet, wash it with deionized water until the surface is clean and free of acid residue, and dry it at 25°C for later use.

[0022] Step 2, the tetraethyl orthosilicate (TEOS) of 38.4g (chemically pure, manufacturer is Tianjin Chemical Reagent No. The manufacturer is Tianjin Dengfeng Chemical Reagent Factory), 20g of deionized water and 1.5g of nitric acid (65% mass fraction) are added in the there-necked flask to form a mixed solution, and the molar ratio of the mixed solution is: TEOS to ethanol to distilled water ratio Nitric acid=1:3.8:6.4:0.08. The three-necked flask was placed in a water bath at 60° C. and stirred at a stirring speed of 120 r / min for 2 hours. The prepared adhesive is placed under the condition of 25° C. for use.

[0023] Step 3, with HZSM-5 molecular sieve (purchase f...

example 2

[0030] Step is the same as example 1, utilizes NH 4 OH (25%-28% mass fraction) to adjust the pH of the plating solution in step 5 to 10. The composition of the coating and the valence state of Pd were analyzed by XPS, and the atomic content of Pd on the surface of the catalyst was found to be 0.6%.

example 3

[0032] Step is the same as example 1, utilizes NH 4 OH (25%-28% mass fraction) adjusts the pH of the plating solution in step 5 to 11. The composition of the coating and the valence state of Pd were analyzed by XPS, and the atomic content of Pd on the surface of the catalyst was found to be 1.8%.

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Abstract

A process for preparing the zeolite molecular sieve film carried noble metal catalyst by chemical plating includes such steps as treating stainless steel as carrier by acid, preparing adhesive from TEOS, alcohol, deionized water and nitric acid, preparing coating liquid from zeolite molecular sieve powder, alcohol and said adhesive, sequentially immersing said carrier in adhesive and coating liquid to generate the zeolite molecular sieve film on the surface of carrier, mixing the solution containing noble metal precursor with complexing agent, regulating pH value to obtain plating liquid, immersing said carrier in it while dripping reducing agent, plating, washing, and baking.

Description

technical field [0001] The invention relates to a method for preparing a zeolite molecular sieve membrane-loaded noble metal catalyst by electroless plating, which belongs to the technology of molecular sieve membrane-loaded noble metal catalysts. 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J37/025B01J29/80B01J23/40
Inventor 邹吉军赵海龙孟凡旭郭伟张香文王莅
Owner TIANJIN UNIV
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