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Method for preparing olefin double-bond isomerization catalyst

An olefin double bond and catalyst technology, applied in the field of catalyst preparation, can solve the problems of poor stability and low reaction activity, and achieve the effects of improved lattice synergy, cheap raw materials and uniform distribution

Inactive Publication Date: 2018-07-17
王一卓
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the disadvantages of poor stability and low reaction activity of existing olefin isomerization catalysts, and provides a preparation method of olefin double bond isomerization catalysts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of preparation method of olefin double bond isomerization catalyst, comprises the steps:

[0029] 1) Add 88g of magnesium oxide powder with a particle size of 50 to 100nm into the mixed solution of 0.3mol / L ferric chloride and nickel chloride prepared in 1000ml, and control the mixture of the magnesium oxide powder and the mixed solute in the solution. The mass ratio is 2:1, and Fe 3+ with you 2+ The molar ratio of the mixture is 1:1, stirred and mixed evenly under ultrasonic conditions;

[0030] 2) Add dropwise 1000ml of ammonia solution with a concentration of 2wt% to the mixture obtained in step 1) while stirring, control the pH of the system to be 9-10, and place the system in a water bath oscillator at 50°C for crystallization reaction for 12 hours after the addition is completed , that is, a hydrotalcite-like structure is grown in situ on the surface of magnesium oxide;

[0031] 3) The product obtained in step 2) is centrifuged, washed with water until p...

Embodiment 2

[0034] A kind of preparation method of olefin double bond isomerization catalyst, comprises the steps:

[0035] 1) Add 60g of magnesia powder with a particle size of 50 to 100nm into 1000ml of a prepared 0.1mol / L mixed solution of ferric chloride and nickel nitrate, and control the quality of the magnesia powder and the mixed solute in the solution The ratio is 3:1, and Fe 3+ with you 2+ The molar ratio of the mixture is 2:1, stirred and mixed evenly under ultrasonic conditions;

[0036] 2) Add 1000ml of ammonia solution with a concentration of 1wt% dropwise to the mixture obtained in step 1) while stirring, control the pH of the system to be 9-10, and place the system in a water bath oscillator at 55°C for crystallization reaction for 12 hours after the addition is completed , that is, a hydrotalcite-like structure is grown in situ on the surface of magnesium oxide;

[0037] 3) The product obtained in step 2) is centrifuged, washed with water until pH = 7-8, and then dried...

Embodiment 3

[0040] A kind of preparation method of olefin double bond isomerization catalyst, comprises the steps:

[0041] 1) Add 270g of magnesia powder with a particle size of 100 to 200nm into 1000ml of a prepared 0.5mol / L mixed solution of iron nitrate and nickel chloride to control the quality of the magnesia powder and the mixed solute in the solution The ratio is 2:1, and Fe 3+ with you 2+ The molar ratio of the mixture is 1:1, stirred and mixed evenly under ultrasonic conditions;

[0042] 2) Add 2000ml of sodium hydroxide solution with a concentration of 4wt% dropwise to the mixture obtained in step 1) while stirring, control the pH of the system to be 9 to 10, and place the system in a water bath shaker at 60°C for crystallization after the addition is complete After reacting for 12 hours, a hydrotalcite-like structure is grown in situ on the surface of magnesium oxide;

[0043] 3) The product obtained in step 2) is centrifuged, washed with water until pH = 7-8, and then drie...

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Abstract

The invention relates to a method for preparing an olefin double-bond isomerization catalyst. The method comprises the following steps: 1) putting magnesium oxide powder into a prepared mixed solutionof an iron salt and a nickel salt, and uniformly stirring and mixing under an ultrasonic condition; 2) stirring while dropping an inorganic alkali solution into the mixture obtained in the step 1), controlling the pH value of the system to 9-10, after dropping completion, performing a crystallization reaction on the system in a water-bath oscillator, and carrying out in-situ growth on the surfaceof magnesium oxide so as to obtain a hydrotalcite structure; 3) performing centrifugal separation on the product obtained in the step 2), and performing water washing and drying to obtain a catalystprecursor; 4) roasting the catalyst precursor obtained in the step 3), thereby obtaining the catalyst. By adopting the method, a hydrotalcite-like precursor of a structure of MgNiFe / LDHs is synthesized on the surface of nano magnesium oxide through crystallization, active components, namely nickel and iron, of the catalyst prepared through roasting with the magnesium oxide as a carrier, are uniformly distributed, the lattice synergetic effect with a magnesium element is further improved, and the catalysis effect is remarkably improved.

Description

technical field [0001] The invention relates to a preparation method of a catalyst, in particular to a preparation method of an olefin double bond isomerization catalyst, and belongs to the technical field of catalyst preparation. Background technique [0002] Double bond isomerization, that is, the transfer of the position of a double bond in an olefinic compound, can convert relatively less valuable or excess olefins into more valuable or relatively less isomers. [0003] At present, the market demand for α-olefins, such as 1-butene, 1-hexene, etc., is gradually increasing. The production of commercial alpha olefins is usually accompanied by the generation of large amounts of isomers. Taking industrial C4 logistics as an example, in addition to 1-butene, 2-butene also accounts for a large proportion. 2-butene can be converted to 1-butene by double bond isomerization. [0004] On the other hand, in some processes, the double bond isomerization reaction will change the bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755C07C5/25C07C11/08C07C11/107
CPCB01J23/755C07C5/2556C07C2523/755C07C11/08C07C11/107
Inventor 王一卓
Owner 王一卓
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