High temperature carbon dioxide adsorbent and preparation method

A carbon dioxide and adsorbent technology, applied in the field of high-temperature carbon dioxide adsorbent, can solve the problems of low absorption rate, stability, repeatability, long reaction time, low absorption rate, etc., achieving simple preparation process, stable sample performance, The effect of reducing energy consumption

Inactive Publication Date: 2014-03-05
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Japan, in 1997, carried out research on the absorption of carbon dioxide by lithium silicate ceramic materials, but the absorption rate was low at that time, less than 10%, and the reaction time was long and the energy consumption was large (Nakagawa R, Ohashi T.A novel method of CO2capture from high temperature gases[J].Electrochem Soc,1998,145:1344-1346)
In China, Wang Yinjie and others have also done some research on the absorption of carbon dioxide by lithium silicate, but the absorption rate, stability and repeatability are not very high (Wang Yinjie, Qi Lu, Wang Weijun. Research on the absorption of CO2 by lithium silicate at high temperature[J] .Journal of Inorganic Chemistry, 2006,22(2):268-272)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] SiO 2 : Li 2 CO 3 : (sodium carbonate + potassium carbonate) according to the molar ratio of 1:2:0.01 to mix the ingredients, take 200g into the beaker, then add ethanol and stir evenly, then pour into the ball mill, homogenize and refine again. Sinter at 750°C for 2 hours, and then grind and refine again to obtain a finer Na and K element co-doped lithium silicate ceramic material. The obtained co-doped lithium silicate material is tested for carbon dioxide absorption rate in a thermogravimetric analyzer , During the test, the temperature was raised from room temperature to 700°C at a rate of 5°C / min, and it was kept at 700°C for 20 minutes to take advantage of the full progress of the reaction. When it reached the adsorption-release equilibrium, the absorption rate was 25wt%, and then carried out When the temperature continues to rise, carbon dioxide will be released. When the temperature reaches 900°C, all carbon dioxide will be released. Repeat this to test the nu...

Embodiment 2

[0020] The preparation method is the same as in Example 1, except that the sintering time is 6 hours, and the others are the same as 1. The absorption rate when reaching the absorption-release equilibrium is 28wt%, and at the same time, when the number of cycles is 10, the attenuation is 3.4%.

Embodiment 3

[0022] SiO 2 : Li 2 CO 3 : (sodium carbonate + potassium carbonate) according to the molar ratio of 1:2:0.02 to mix the ingredients, take 200g into the beaker, then add ethanol and stir evenly, then pour into the ball mill, homogenize and refine again. Sintered at 800°C for 6 hours, then finer Na and K element co-doped lithium silicate ceramic materials were obtained by grinding again, and the obtained co-doped lithium silicate materials were tested for carbon dioxide absorption rate, which reached the adsorption-release The absorption rate at equilibrium is 45wt%, and the attenuation is 3% when the number of cycles is 15.

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PUM

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Abstract

The invention discloses a high temperature carbon dioxide adsorbent and its preparation method, which belong to the field of emission reduction technology in greenhouse effect. According to the invention, SiO2 and Li2CO3 are taken as a raw material, sodium carbonate and potash are taken as an adulterant, and a lithium silicate ceramic material codoped by Na and K elements can be obtained through batch mixing and sintering at high temperature. The high temperature carbon dioxide adsorbent and preparation method have the advantages that the prepared lithium silicate material has stable performance for absorbing carbon dioxide, the repetition rate usage is high, and the industrial production is easy.

Description

technical field [0001] The invention relates to the field of emission reduction in the greenhouse effect, in particular to a method for preparing a high-temperature carbon dioxide adsorbent, that is, a Na and K co-doped lithium silicate ceramic material. The adsorbent can be used for tail gas flues of industrial enterprises using fossil fuels, etc. CO2 is directly processed during the emission process. Background technique [0002] At present, fossil fuels such as coal and petroleum are still the main energy materials in heavy industrial enterprises. The burning of fossil fuels will inevitably release a large amount of high-temperature carbon dioxide, which will increase the carbon dioxide content in the atmosphere and intensify the greenhouse effect. There are many materials that absorb carbon dioxide at room temperature, and the absorption rate is also very high, some even reach 80% of the theoretical absorption value, but there is a premise that carbon dioxide must be at ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30B01D53/02C04B35/16C04B35/622
CPCY02C10/08Y02C20/40
Inventor 陈思达徐征
Owner BEIJING JIAOTONG UNIV
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