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Preparation method of calcium-based carbon dioxide adsorbent

A carbon dioxide and adsorbent technology, which is applied in the field of gas enrichment, separation and purification, can solve the problem of high doping cost, achieve large adsorption capacity, reduce losses, and benefit adsorption capacity

Pending Publication Date: 2021-12-31
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cost of doping with zeolite, alumina and other substances is relatively high

Method used

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  • Preparation method of calcium-based carbon dioxide adsorbent
  • Preparation method of calcium-based carbon dioxide adsorbent
  • Preparation method of calcium-based carbon dioxide adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Mix calcium nitrate tetrahydrate and citric acid monohydrate in deionized water at a mass ratio of 1:1.1, and stir for 6 hours in an oil bath at 85°C; add metakaolin to the mixed solution to control the quality of metakaolin and calcium oxide The ratio is 0.5:9.5, continuously stirred in an oil bath at 85°C for 3h; the obtained mixed solution was left to stand at room temperature for 18h; the mixed solution after standing was slowly stirred at 85°C until a wet gel was formed, and the stirring rate was controlled The temperature was 90 rpm; the wet gel was dried in an oven at 105 °C for 24 h; the obtained dry gel was ground and calcined in a muffle furnace at 850 °C for 3 h, and the heating rate was controlled at 3 °C / min. A modified calcium-based carbon dioxide adsorbent is prepared.

Embodiment 2

[0035] Mix calcium nitrate tetrahydrate and citric acid monohydrate in deionized water at a mass ratio of 1:1.05, and stir for 5.5 hours in an oil bath at 85°C; add metakaolin to the mixed solution to control the quality of metakaolin and calcium oxide. The mass ratio is 1:9, stirring continuously for 3.5h in an oil bath at 85°C; the obtained mixed solution is left to stand at room temperature for 16h; the mixed solution after standing is stirred slowly at 85°C until a wet gel is formed, controlled The stirring rate was 100 rpm; the wet gel was dried in an oven at 105 °C for 22 h; the obtained dry gel was ground and calcined in a muffle furnace at 850 °C for 3 h, and the heating rate was controlled at 3 °C / min. A modified calcium-based carbon dioxide adsorbent is prepared.

Embodiment 3

[0037] Mix calcium nitrate tetrahydrate and citric acid monohydrate in deionized water at a mass ratio of 1:1, and stir for 5 hours in an oil bath at 85°C; add metakaolin to the mixed solution to control the quality of metakaolin and calcium oxide The ratio is 1.5:8.5, continuously stirred in an oil bath at 85°C for 4h; the obtained mixed solution was left to stand at room temperature for 15h; the mixed solution after standing was slowly stirred at 85°C until a wet gel was formed, and the stirring rate was controlled The temperature was 110 rpm; the wet gel was dried in an oven at 105 °C for 20 h; the obtained dry gel was ground and calcined in a muffle furnace at 850 °C for 3 h, and the heating rate was controlled at 3 °C / min. A modified calcium-based carbon dioxide adsorbent is prepared.

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Abstract

A preparation method of a calcium-based carbon dioxide adsorbent is provided. An inert framework is formed after metakaolin is doped to solve the problem that a calcium-based adsorbent is prone to sintering. The invention belongs to the technical field of gas enrichment, separation and purification. Calcium salt, metakaolin and citric acid are used as raw materials, and an adsorbent precursor is prepared through a sol-gel process; and the adsorbent precursor is calcined in a muffle furnace to obtain the calcium-based carbon dioxide adsorbent. The calcium-based adsorbent prepared by the method is large in adsorption capacity and good in cycling stability, and can be applied to trapping carbon dioxide in flue gas after combustion and in a methane reforming hydrogen production process through stable adsorption / desorption circulation. The adopted dopant is wide in source and low in cost, the whole preparation process is simple and easy to implement, the sintering problem that calcium oxide particles are prone to agglomeration and adhesion in the process that the calcium-based adsorbent cyclically captures carbon dioxide is effectively solved, and the adsorption performance and cycle stability of the calcium oxide adsorbent on carbon dioxide are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of gas enrichment, separation and purification, and in particular relates to a preparation method of a calcium-based carbon dioxide adsorbent. Background technique [0002] In recent years, global warming caused by the greenhouse effect is bringing a series of climate disasters. Among them, carbon dioxide is the main greenhouse gas, contributing up to 70% of the greenhouse effect. The 2019 Global Atmospheric Greenhouse Gas Bulletin released by the World Meteorological Organization shows that the global atmospheric carbon dioxide concentration has reached 410.5±0.2 ppm. Industrial processes such as coal-fired gas-fired power generation, steel and cement manufacturing, etc. contribute up to 80% of the increase in carbon dioxide in the atmosphere. Capturing carbon dioxide from such large-scale emission sources is the key to mitigating global warming. [0003] Currently, CO2 capture methods mainly include pre-...

Claims

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Application Information

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IPC IPC(8): B01J20/12B01D53/02B01J20/30
CPCB01J20/041B01J20/12B01D53/02B01D2257/504Y02C20/40
Inventor 郭彦霞耿一琪程芳琴张慧荣狄子琛
Owner SHANXI UNIV
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