Novel carbon dioxide adsorbent and preparation method thereof

Abstract

The invention discloses a novel carbon dioxide adsorbent and a preparation method thereof. The novel carbon dioxide adsorbent adopts lithium metatitanate with the chemical formula Li2TiO3 or sodium-doped lithium metatitanate with the chemical formula Li2(1-x)Na2xTiO3 to adsorb carbon dioxide at the high temperature of 500 to 700 DEG C. The lithium metatitanate is prepared by synthesizing raw materials comprising tetrabutyl titanate, lithium acetate, absolute ethanol, glacial acetic acid and water by an alkoxide hydrolysis sol-gel method; then the sodium-doped lithium metatitanate Li2(1-x)Na2xTiO3 is prepared by adding sodium acetate. When the temperature is above 500 DEG C, the adsorbent starts to react with the carbon dioxide and adsorption is performed; when the temperature is above 700 DEG C, reaction is performed reversely, carbon dioxide gas is released and the adsorbent is regenerated. The carbon dioxide of high-temperature flue gas can be adsorbed; the process is simple and convenient; products are easy to separate; materials are easy to regenerate and can be recycled. The preparation method provided by the invention is stronger in system chemical uniformity; the reaction process is easy to control; the calcinations molding temperature is low and requirements on equipment are low; modification is facilitated; components are uniform and have high purity.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a novel carbon dioxide adsorbent and a preparation method, in particular to a new technology using lithium metatitanate or sodium-doped lithium metatitanate as a novel carbon dioxide adsorbent. Background technique [0002] One of the most important environmental problems at present is the greenhouse effect caused by a large amount of carbon dioxide emissions. For the carbon dioxide emissions of coal-fired power plants, it is mainly treated by post-combustion capture. Solution absorption is a common method of post-combustion capture, that is, by using solvents (organic amine or cold ammonia) to separate carbon dioxide from flue gas, and can separate up to 90% of carbon dioxide from flue gas produced by combustion. Although this method has a large absorption capacity and rapid reaction, it inevitably faces problems such as poor thermal stability, difficult separation, easy to corr...

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Problems solved by technology

[0009] Judging from the existing technology, it has not been found that lithium metatitanate is used as a solid adsorbent material to adsorb carbon dioxide, especially as a solid adsorbent material to adsorb carbon dioxide emitted by coal-fired power plants

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