A high-purity kaolin-based carbon dioxide adsorbent and its preparation method

CN118681529BActive Publication Date: 2026-05-26CHINA UNIV OF GEOSCIENCES (WUHAN) +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA UNIV OF GEOSCIENCES (WUHAN)
Filing Date
2024-06-24
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing technologies often damage the structure of clay minerals when preparing kaolin-based carbon dioxide adsorbents, resulting in lengthy and costly preparation processes that fail to fully leverage the advantages of clay minerals as natural adsorbents for geological CO2 sequestration.

Method used

A high-purity kaolin-based carbon dioxide adsorbent was prepared by a simple method of thermal activation and acid treatment, which improved the exposure degree and specific surface area of ​​the main end faces while preserving the intrinsic structure of clay minerals. The reaction was carried out by heating at 5-10℃/min and stirring in a water bath at 60-90℃, and the concentration and time of acid treatment were controlled to ensure the controllability of the exposure degree and specific surface area of ​​the end faces.

Benefits of technology

It significantly improves the carbon dioxide adsorption performance of kaolin, increasing the adsorption capacity by 1-3 times, while maintaining the structural stability and adsorption performance of clay minerals, simplifying the preparation process and reducing costs.

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Abstract

This invention discloses a high-purity kaolin-based carbon dioxide adsorbent and its preparation method. This invention relates to the field of carbon dioxide adsorbent technology. The preparation method involves heating kaolin with a purity of not less than 96% in a muffle furnace at a heating rate of 5-10℃ / min and holding it at 100-400℃ for a period of time, then cooling it to room temperature, and taking out a sample of the high-purity kaolin-based carbon dioxide adsorbent. The sum of the relative texture coefficients (RTCs) of the end faces (020), (-110), (-1-11), (-201), (-131), and (-202) of the high-purity kaolin-based carbon dioxide adsorbent is >64. The high-purity kaolin carbon dioxide adsorbent prepared by this invention has a carbon dioxide adsorption performance that is 1-3 times higher than that of natural kaolin.
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