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Method for preparing a sintering-resistant metal catalyst

A metal catalyst and anti-sintering technology, applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, chemical instruments and methods, etc., can solve problems such as easy deactivation, and achieve universal application Effect

Active Publication Date: 2019-08-23
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem that Cu-based catalysts on fixed-bed reactors are easily deactivated due to high-temperature sintering, and proposes a preparation method for anti-sintering Cu-based catalysts

Method used

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  • Method for preparing a sintering-resistant metal catalyst
  • Method for preparing a sintering-resistant metal catalyst
  • Method for preparing a sintering-resistant metal catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 30.2 g Cu(NO 3 ) 2 ·3H 2 O and 18.6 g Zn(NO 3 ) 2 ·6H 2 O was dissolved in 100 ml distilled water to obtain 1# mixed solution.

[0021] Weigh 55.1 g of aluminum isopropoxide and place it in a three-necked flask, add 300 ml of water, heat to 80 °C in the electric heating mantle for hydrolysis for 1.0 h, gradually heat up to 95 °C over 30 min, then add 2.3 ml of concentrated nitric acid, and slowly pour The above 1# mixed solution was stirred and refluxed at 95°C for 10 h until a translucent sol was formed. The sol was aged at room temperature for 10 days to obtain jelly-like 2# gel.

[0022] Disperse 2# gel in 300 ml of liquid paraffin, drop an appropriate amount of span80, use a high-shear mixing emulsifier to emulsify the gel and liquid paraffin, and then 2 Under protection, the temperature was raised to 300 °C for 10 h to obtain a slurry catalyst. After the slurry catalyst is centrifuged, take the solid phase and place it in a Soxhlet extractor to extrac...

Embodiment 2

[0028] Weigh 61.2 g Cu(NO 3 ) 2 ·3H 2 O and 37.6 g Zn(NO 3 ) 2 ·6H 2 O, 37.8 g Al 2 (NO 3 ) 3 9H 2 O was dissolved in 100 ml distilled water to obtain 4# mixed solution.

[0029] Weigh 62 g Na 2 CO 3 Dissolve in 100ml of water to obtain 5# solution.

[0030] Pump the 4# mixed solution and the 5# solution into the large beaker at the same flow rate with a liquid pump, and stir at the same time to obtain the co-precipitation catalyst precursor. After the precipitation is completed, let it stand for aging for 2 hours, filter, and wash repeatedly until no Na is present. + , to obtain the 6# catalyst precursor.

[0031] Disperse the 6# catalyst precursor in 300 ml of ethylene glycol, drop an appropriate amount of span80, use a high-shear mixing emulsifier to emulsify the gel and liquid paraffin, and then 2 Under protection, the temperature was raised to 220 °C for 10 h to obtain a slurry catalyst.

[0032] After the slurry catalyst is centrifuged, take the solid phas...

Embodiment 3

[0038] Preparation of Cu-Zn / ZrO by Equal Volume Impregnation Method 2 catalyst. The specific steps are as follows: the Cu(NO 3 )2 •6H 2 O and Zn(NO 3 ) 2 •6H 2 O was dissolved in deionized water and an equal volume was impregnated in ZrO 2 Carrier, magnetically stirred at room temperature for half an hour and allowed to stand for 1 day to obtain 8# catalyst precursor.

[0039] Disperse the 8# catalyst precursor in 300 ml polyethylene glycol-600, use a high-shear mixing emulsifier to emulsify the gel and liquid paraffin, and then 2 Under protection, the temperature was raised to 250 °C for 10 h to obtain a slurry catalyst.

[0040] After the slurry catalyst is centrifuged, the solid phase is placed in a Soxhlet extractor and extracted with a low-boiling organic solvent for a period of time, and the extracted catalyst is placed at room temperature to volatilize the solvent to obtain a catalyst that has been heat-treated in the organic liquid phase.

[0041] Put the cat...

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Abstract

The invention discloses a method for preparing a sintering-resistant metal catalyst, and belongs to the field of catalyst preparation. The problem of sintering is common in the field of catalysis, andis especially common for fixed bed reactions, and migration, agglomeration and growth of active components are caused by sintering of catalysts so that the catalysts are deactivated. The method for preparing the sintering-resistant catalyst has the characteristic of comprising the steps: performing heat treatment on a precursor in an organic liquid phase firstly, then performing Soxhlet extraction and natural airing so as to form solid powder, and finally performing calcination in an inert atmosphere. The surface of the metal catalyst prepared using by the method is covered with a layer of porous carbon films, and the metal catalyst particles can be isolated through the porous carbon films, so that the catalyst is prevented from being sintered; and the method for preparing the catalyst issuitable for preparation of sintering-resistant catalysts which adopt elemental metal as a main body, and the use environment of the metal catalyst is a reaction system which contains no oxidizing gas.

Description

technical field [0001] The invention relates to a method for preparing a sintering-resistant metal catalyst, which relates to a method for preparing a catalyst capable of slowing down and preventing the sintering of the metal catalyst, and belongs to the technical field of catalyst preparation. The method is suitable for the preparation of various metal-based anti-sintering catalysts on a fixed-bed reactor. Background technique [0002] As the basis of the chemical industry, catalysts play a vital role in modern chemical production. Among them, metal catalysts are widely used due to the advantages of simple preparation process, low cost, high activity and high selectivity. When the size of metal particles reaches the nanoscale or even smaller, the atomic utilization rate of the metal can be improved, and even the size effect of the material can be used to improve the catalytic activity of the metal catalyst. However, the smaller the particle size of the metal particles, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J37/02B01J37/08C07C29/154C07C31/04C07C41/01C07C43/04C07C43/06
CPCB01J23/80B01J37/0201B01J37/082C07C29/154C07C41/01C07C31/04C07C43/043C07C43/06Y02P20/52
Inventor 栾春晖李旭平刘勇军樊金串黄伟
Owner TAIYUAN UNIV OF TECH
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