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Method for preparing easily dispersed magnetic biomass carbon-based solid acid catalyst

A carbon-based solid acid and biomass technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of long magnetic retention time, high chemical activity, and reduced dispersion, and achieve Low cost, simple preparation process, and long magnetic time

Inactive Publication Date: 2016-08-24
NINGBO JIANGDONG POMONA ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem mainly solved by the present invention: for the magnetic component in the current magnetic biomass carbon-based solid acid catalyst, due to the small particle size of the magnetic particles, the surface has a large specific surface area and high surface activity, so it is easy to Agglomeration, reduced dispersion, and high chemical activity, easy to be oxidized, resulting in the problem that the magnetic properties of the system are reduced. A method for preparing an easily dispersible magnetic biomass carbon-based solid acid catalyst is provided. The present invention takes walnut shells for acidification. After alkali modification, it is ground into powder, ferrous sulfate, ferric nitrate and walnut shell powder are mixed and reacted to obtain a magnetic biomass matrix, and then the surface of the magnetic biomass matrix is ​​coated with silica to obtain a catalyst precursor, and then carbonized , sulfonation reaction, washing and drying. After the magnetic biomass substrate is coated with silicon dioxide in the present invention, the dispersibility and thermal stability of the magnetic particles in the aqueous solution are promoted, agglomeration is not easy to occur, and the activity of the catalyst is improved at the same time. It is not easy to be oxidized, maintains magnetism for a long time, has a high reuse rate, and has a simple preparation process and low cost

Method used

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Examples

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Effect test

example 1

[0017] 8. First weigh 400g of walnut shells and pour them into a 5L beaker, add an appropriate amount of distilled water to the beaker until the walnut shells are completely submerged, then move the beaker into an ultrasonic oscillator, and use 100W power for ultrasonic cleaning for 20 minutes to remove floating dust on the surface of the walnut shells, and finally put Dry in an oven to obtain clean walnut shells; put the cleaned walnut shells into an airflow grinder and first crush them into walnut pieces with a particle size of less than 5mm, and use 0.5mol / L sulfuric acid and 0.3mol / L sulfuric acid to separate the pieces. Soak in L caustic soda for 1 hour, rinse the fragments with deionized water until the eluent is neutral after soaking, then put the acid-base modified walnut shell fragments into a corundum mortar and grind them into powder; Add 100mL concentration of 0.2mol / L ferrous sulfate and 200mL concentration of 0.3mol / L ferric nitrate solution into the three-necked ...

example 2

[0020]10. First weigh 450g of walnut shells and pour them into a 5L beaker, add an appropriate amount of distilled water to the beaker until the walnut shells are completely submerged, then move the beaker into an ultrasonic oscillator, and use 150W power for ultrasonic cleaning for 25 minutes to remove floating dust on the surface of the walnut shells, and finally put Dry in an oven to obtain clean walnut shells; put the cleaned walnut shells into an airflow grinder and first crush them into walnut pieces with a particle size of less than 5mm, and use 0.5mol / L sulfuric acid and 0.3mol / L sulfuric acid to separate the pieces. Soak in L caustic soda for 1.5h, rinse the fragments with deionized water until the eluent is neutral after soaking, then put the acid-base modified walnut shell fragments into a corundum mortar and grind them into powder; Add 150mL concentration of 0.2mol / L ferrous sulfate and 250mL concentration of 0.3mol / L ferric nitrate solution into the three-necked fl...

example 3

[0023] 12. First weigh 500g of walnut shells and pour them into a 5L beaker, add an appropriate amount of distilled water to the beaker until the walnut shells are completely submerged, then move the beaker into an ultrasonic oscillator, and ultrasonically wash with 200W power for 30 minutes to remove floating dust on the surface of the walnut shells, and finally put Dry in an oven to obtain clean walnut shells; put the cleaned walnut shells into an airflow grinder and first crush them into walnut pieces with a particle size of less than 5mm, and use 0.5mol / L sulfuric acid and 0.3mol / L sulfuric acid to separate the pieces. Soak in L caustic soda for 2 hours, rinse the fragments with deionized water until the eluent is neutral after soaking, then put the acid-base modified walnut shell fragments into a corundum mortar and grind them into powder; Add 200mL concentration of 0.2mol / L ferrous sulfate and 300mL concentration of 0.3mol / L ferric nitrate solution into the three-necked f...

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Abstract

The invention discloses a method for preparing an easily dispersed magnetic biomass carbon-based solid acid catalyst and belongs to the field of carbon-based solid acid catalysts. Walnut shells are obtained for acid and alkali modification and then ground into powder, ferrous sulfate, ferric nitrate and the walnut shell powder are mixed and react to obtain a magnetic biomass matrix, then the surface of the magnetic biomass matrix is wrapped by silicon dioxide to obtain a catalyst precursor, and then the catalyst is obtained through carbonization, sulfonation reaction, washing and drying. After the magnetic biomass matrix is wrapped by silicon dioxide, dispersity and heat stability of magnetic particles in an aqueous solution are promoted, agglomeration is not likely to happen, activity of the catalyst is improved, the catalyst cannot be oxidized easily, magnetism time is kept long, the repeated utilization rate is high, the preparation process is simple, and cost is low.

Description

technical field [0001] The invention discloses a preparation method of an easily dispersible magnetic biomass carbon-based solid acid catalyst, belonging to the field of carbon-based solid acid catalysts. Background technique [0002] With the enhancement of people's awareness of environmental protection and the continuous development of green chemical production in recent years, the development of environmentally friendly solid acid catalysts has attracted more and more attention from scientific researchers. It has high catalytic activity, high selectivity, mild reaction conditions, and can be recycled. Solid catalysts with advantages such as use have more and more obvious advantages in industries such as the environment, chemistry, and pharmaceuticals. In particular, bifunctional composite solid acid catalysts exhibit many excellent properties different from conventional solid acids, especially in terms of catalytic activity and high specific surface area. It also shows b...

Claims

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Application Information

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IPC IPC(8): B01J27/02B01J21/08
CPCB01J21/08B01J27/02B01J37/084B01J35/33
Inventor 叶先龙王志慧林大伟
Owner NINGBO JIANGDONG POMONA ELECTRONICS TECH
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