Preparation method of lithium silicate porous material used for absorption of high temperature CO2

A porous material, lithium silicate technology, applied in the field of preparation of lithium silicate porous materials, can solve problems such as lithium silicate porous materials that have not yet been seen, and achieve the effects of avoiding ball milling and calcination, reducing emissions, and reducing CO2 emissions.

Active Publication Date: 2014-08-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] So far, no high-temperature absorbing CO has been prepared by sol-gel combustion synthe

Method used

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  • Preparation method of lithium silicate porous material used for absorption of high temperature CO2
  • Preparation method of lithium silicate porous material used for absorption of high temperature CO2
  • Preparation method of lithium silicate porous material used for absorption of high temperature CO2

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Lithium nitrate 0.4mol is dissolved in the mixed solvent 80ml that contains ethanol 55vol% ethanol and water, configuration molar concentration is the lithium nitrate solution of 5mol / L, then adds the citric acid of 0.07mol, stirs to obtain solution A; Add lithium nitrate and Add 0.1mol tetraethyl orthosilicate dropwise to the clear solution of citric acid and stir to obtain solution B; heat and stir the above solution B at 60°C for two hours to promote the hydrolysis of tetraethyl orthosilicate and complete the sol-gel transformation at the same time to obtain jelly shaped gel; put the gel in an oven, age at 70°C for 12 hours, and then dry at 120°C for 15 hours to obtain a xerogel precursor; grind the xerogel precursor into powder, then press it into a Lithium silicate porous material is obtained after medium ignition and combustion.

[0043] The thermogravimetric-differential thermal analysis results of the xerogels are found in figure 1 ,from figure 1 It can be see...

Embodiment 2

[0046] Dissolve 0.4 mol of lithium nitrate in 80 ml of a mixed solvent of ethanol and water containing 55 vol % of ethanol, configure 2 parts of lithium nitrate solutions with a molar concentration of 5 mol / L, add 0.05 mol and 0.1 mol of citric acid respectively, stir to obtain clarification Solution, other technological process and process parameter are with implementing example 1.

[0047] Carry out CO under the same condition as embodiment example 1 2 Adsorption test shows that the absorption rates are 26.5% and 24.2%, respectively.

Embodiment 3

[0049] Referring to the configuration of 3 parts of solution B in Example 1, the hydrolysis and sol-gelation processes were carried out at 40°C, 50°C and 70°C respectively. The corresponding hydrolysis time is shown in Table 1. Other technological process and technological parameter are with implementing example 1.

[0050] Carry out CO under the same condition as embodiment example 1 2 Adsorption test, the measured absorption rate is shown in Table 1.

[0051] Table 1 CO of products at different hydrolysis and sol-gelation temperatures 2 Absorption rate

[0052]

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Abstract

The invention relates to a preparation method of a lithium silicate porous material used for absorption of high temperature CO2; according to the preparation method, lithium nitrate is used as a lithium source and an oxidizing agent, ethyl orthosilicate is used as a silica source, citric acid is used as a complexing agent and a fuel, a mixture of ethanol and water is used as a solvent, and a sol-gel combustion synthesis method is used. The preparation method is as follows: first, the citric acid and the lithium nitrate are dissolved in the solvent, then the ethyl orthosilicate is added to obtain a precursor by hydrolysis, sol-gelatinization, ageing and drying, after compression moulding, the precursor is ignited in air, and after combustion, the lithium silicate porous material used for absorption of high temperature CO2 can be obtained. The lithium silicate porous material used for absorption of high temperature CO2 is uniform in pore distribution and high in activity of carbon dioxide absorption. Compared with the prior art, the lithium silicate porous material is directly prepared by the sol-gel combustion synthesis method, the technological process is simplified without the need for complex and expensive equipment, and the lithium silicate porous material is easy to realize the industrialized production.

Description

technical field [0001] The invention relates to a method for absorbing high temperature CO 2 The preparation method of the lithium silicate porous material, which is used to absorb high-temperature CO emitted from the flue of power plants, cement plants, etc. 2 , belonging to the field of environmental materials. technical background [0002] In recent years, climate warming has become a global environmental problem, CO in the atmosphere 2 The greenhouse effect caused by the increase of the content of greenhouse gases is the main cause of climate warming. Currently, the global response to CO 2 The demand for emission reduction is becoming more and more urgent, and the CO 2 Separation technologies present challenges requiring the development of more 2 Chemical absorbents to reduce greenhouse gas emissions and rationally utilize CO 2 Resource SDGs. [0003] Currently, for high temperature CO 2 There are still many studies on chemical absorbents. Due to the considerati...

Claims

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Application Information

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IPC IPC(8): C01B33/32B01J20/10B01J20/30B01D53/02
CPCY02P20/151
Inventor 张迎春洪明向茂桥姜媛媛
Owner UNIV OF SCI & TECH BEIJING
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