A kind of medium temperature carbon dioxide adsorbent and its preparation and use method

A carbon dioxide and adsorbent technology, which is applied in the field of medium-temperature carbon dioxide adsorbents, can solve the problems of low adsorption capacity of medium-temperature carbon dioxide adsorbents, and achieve the effects of excellent adsorption performance, improved processing efficiency, and increased average pore size

Active Publication Date: 2020-07-24
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a medium-temperature carbon dioxide adsorbent with high adsorption capacity at a temperature of 200-400 ° C and its preparation and use method, so as to solve the problem of low adsorption capacity of the existing medium-temperature carbon dioxide adsorbent

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  • A kind of medium temperature carbon dioxide adsorbent and its preparation and use method
  • A kind of medium temperature carbon dioxide adsorbent and its preparation and use method

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Experimental program
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Effect test

Embodiment 1

[0024] (1). Accurately weigh 15.385g Mg(NO 3 ) 2 ·6H 2 O and 7.51gAl(NO 3 ) 3 9H 2 O dissolved in 100ml to remove CO 2 prepared in deionized water containing [Mg 2+ ]=0.6mol / L, [Al 3+ ]=0.2mol / L mixed salt solution; Weigh 6.4g solid NaOH and dissolve in 100ml to remove CO 2 Prepare a 1.6mol / L alkaline solution in deionized water.

[0025] (2). Use the nucleation crystallization isolation method to prepare the hydrotalcite precursor. Add the mixed salt solution and the mixed alkali solution in step (1) dropwise to the colloid mill at the same speed. The stirring speed of the colloid mill is 3000rmp, and the obtained The slurry was quickly transferred to a 500ml three-necked bottle, and the slurry was crystallized at 80°C for 8 hours under nitrogen protection, and then deCO2 2Washed with deionized water to neutrality, the slurry-like intercalated hydrotalcite precursor Mg 3 Al-NO 3 -LDH.

[0026] (3). Disperse intercalated hydrotalcite precursor in CO removal 2 0.01...

Embodiment 2

[0031] (1). Accurately weigh 15.385g Mg(NO 3 ) 2 ·6H 2 O and 7.51gAl(NO 3 ) 3 9H 2 O dissolved in 100ml to remove CO 2 prepared in deionized water containing [Mg 2+ ]=1.2mol / L, [Al 3+ ]=0.6mol / L mixed salt solution; Weigh 6.4g of solid NaOH and dissolve it in 100ml to remove CO 2 Alkaline solution in deionized water.

[0032] (2). Use the nucleation crystallization isolation method to prepare the hydrotalcite precursor. Add the mixed salt solution and the mixed alkali solution in step (1) dropwise to the colloid mill at the same speed. The stirring speed of the colloid mill is 3000rmp, and the obtained The slurry was quickly transferred to a 500ml three-necked bottle, and the slurry was crystallized at 80°C for 8 hours under nitrogen protection, and then deCO2 2 Washed with deionized water to neutrality, the slurry-like intercalated hydrotalcite precursor Mg 3 Al-NO 3 -LDH.

[0033] (3). Disperse intercalated hydrotalcite precursor in CO removal 2 0.1mol / L suspens...

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Abstract

The invention discloses a medium temperature carbon dioxide adsorbent as well as a preparation and using method of the medium temperature carbon dioxide adsorbent. In the invention, hydrotalcite is prepared by using a nucleation-crystallization isolation method, organic anions are intercalated into an interlayer through an ion exchange method, a cellulosic modifier is added, finally calcined activation is performed to obtain the medium temperature carbon dioxide adsorbent. The adsorbent is obviously improved in the aspects of specific surface area, pore volume and the like, and further increased in average pore diameter, and the adsorbent surface has more adsorptive active centers, so that the medium temperature carbon dioxide adsorbent has excellent performance. The medium temperature carbon dioxide adsorbent provided by the invention is simple in preparation method, low in raw material cost and free of toxic and harmful substances, thereby avoiding pollution to the environment. The adsorbent is used in removal of carbon dioxide from medium temperature gases such as a coal-fired flue gas and a water-gas shift gas, thereby being capable of eliminating the process of gas heating orcooling to improve the processing efficiency and reduce energy consumption.

Description

technical field [0001] The invention relates to the technical field of composite functional materials, in particular, it provides a medium-temperature carbon dioxide adsorbent and a preparation and use method thereof. Background technique [0002] With the development of the world's industrial economy and the widespread use of fossil energy, carbon dioxide emissions continue to increase, and the world's climate is facing more and more serious problems. At present, in industrial production, a large amount of flue gas containing carbon dioxide is produced due to the burning of coal for power generation and heat generation. Separating and capturing industrial waste gas or carbon dioxide produced during coal reforming and utilization is very important to reduce carbon emissions. The captured carbon dioxide can be buried or reused. [0003] According to the working temperature of the adsorbent, solid carbon dioxide adsorbents can be divided into high-temperature adsorbents, medi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/06B01J20/30B01D53/02
CPCB01D53/02B01D2252/10B01D2257/504B01J20/041B01J20/06B01J2220/4806B01J2220/4825Y02C20/40
Inventor 林彦军张心悦李凯涛杨阳
Owner BEIJING UNIV OF CHEM TECH
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