Method for preparing capacitive active carbon powder through biomaterial treated by fused salt

A biomass and capacitive technology, applied in the field of carbon materials, can solve the problems of large consumption of activators, difficult recovery of activators, difficulty in separating the product activated carbon from activators, etc., and achieve the effect of short reaction process and pollution reduction

Inactive Publication Date: 2014-10-01
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nevertheless, chemical activation still needs to consume a large amount of activator, and the activator is difficult to recover, and it is also difficult to separate the product activated carbon from the activator.

Method used

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  • Method for preparing capacitive active carbon powder through biomaterial treated by fused salt
  • Method for preparing capacitive active carbon powder through biomaterial treated by fused salt
  • Method for preparing capacitive active carbon powder through biomaterial treated by fused salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: One-step treatment of peanut shells with sodium carbonate-potassium carbonate molten salt to prepare capacitive activated carbon powder

[0026] Na with a mass ratio of 1:1 2 CO 3 and K 2 CO 3 Mix molten salt as the molten salt medium for the reaction of peanut shells. Wash the peanut shells and dry them. Then chop the dried peanut shells and press them into a cake shape. Then wrap the cake-shaped peanut shells with a high-temperature-resistant material net and use a liftable The operating rod of high temperature resistant material is immersed in the molten salt for cracking, and the molten salt is heated to 850 ℃ for 1 hour by electric energy. After cracking for 1 hour, the processed product is taken out of the molten salt and placed in the reaction Cool in the inert atmosphere above the reactor, then take it out from the reactor and wash the molten salt in the product with water, and finally dry the product to obtain capacitive activated carbon powd...

Embodiment 2

[0028] Example 2: Li 2 CO 3 -Na 2 CO 3 -K 2 CO 3 Preparation of capacitive activated carbon powder by one-step processing of peanut shells with ternary mixed molten salt at different temperatures

[0029] With Li 2 CO 3 -Na 2 CO 3 -K 2 CO 3 Mix molten salt (the molar ratio is 43.5:31.5:25) as the molten salt medium for peanut shell cracking reaction, and use the same method as in Example 1 at different temperatures (450°C, 550°C, 650°C, 750°C, 850°C) Methods and steps Treat peanut shells to prepare activated carbon powder. It is found that the carbon powder obtained at the temperature of 650 ℃ and below has basically no capacitance, and the capacitance of the carbon powder prepared at the temperature of 750 ℃ ​​and above increases significantly. Among them, the capacitance value at 750 ℃ ​​is 82.5 F / g, and the capacitance value at 850 ℃ is 120 F / g.

[0030]

Embodiment 3

[0031] Example 3: One-step treatment of peanut shells in different carbonate molten salt systems at the same temperature to prepare capacitive carbon powder

[0032] Under the condition of cracking temperature of 850℃, Na 2 CO 3 -K 2 CO 3 , Li 2 CO 3 -Na 2 CO 3 -K 2 CO 3 Molten salt is as the molten salt medium of peanut shell cracking, handles peanut shell with the same method and step in embodiment 1 and prepares gac powder, finds that in Na 2 CO 3 -K 2 CO 3 Peanut shells prepared in molten salt have a capacitance (149 F / g) higher than that of Li 2 CO 3 -Na 2 CO 3 -K 2 CO 3 system (120 F / g).

[0033]

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PUM

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Abstract

The invention relates to a method for preparing capacitive active carbon powder through a biomaterial treated by fused salt, and belongs to the field of carbon materials. The method comprises the following steps: washing, drying and mincing a waste biomaterial, and preparing the waste biomaterial into a feed material in a definite shape; wrapping the prepared feed material by using a mesh bag made from high-temperature resistant materials or a basket, and fixing on an operating rod made from the high-temperature resistant materials; heating the fused salt to 750-850 DEG C, then immersing the feed material into the fused salt for cracking, and lifting to the upper part of a reactor after 1 hour, and cooling in an inert atmosphere; finally washing a small amount of salt contained in a product by using water so as to prepare active carbon. The method disclosed by the invention can not only be used for recycling the waste biomaterial, but also be used for preparing the active carbon, and changing wastes into valuables.

Description

[0001] technical field [0002] The invention relates to a method for preparing capacitive activated carbon powder by treating biomass with molten salt, and belongs to the field of carbon materials. Background technique [0003] Due to its huge specific surface area and stable physical and chemical properties, activated carbon is widely used in adsorption, battery and electrode materials, catalyst supports and other fields. At present, the common activated carbon is prepared by cracking wood or high-quality coal under high temperature conditions, and its high production cost restricts the application of activated carbon. The preparation of activated carbon from cheap and readily available biomass as a carbon source has attracted extensive attention in recent years. The current method of using biomass to prepare activated carbon is generally a two-step method. The first step is to carbonize the biomass under an inert atmosphere at a certain temperature to form biochar. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12
Inventor 汪的华尹华意卢北虎毛旭辉
Owner WUHAN UNIV
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