2002 Fiscal Year Final Research Report Summary
Study on the Absorption of Carbon Dioxide by Zeolite transformed from Coal Fly Ash
| Project/Area Number |
12650220
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Thermal engineering
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| Research Institution | ISHIKAWA NATIONAL COLLEGE OF TECHNOLOGY |
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Principal Investigator |
MATSUDA Osamu ISHIKAWA National College of Technology, Dept. of Mechanical Engineering, Professor, 機械工学科, 教授 (10110157)
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| Co-Investigator(Kenkyū-buntansha) |
TAKIMOTO Akira KANAZAWA University, Graduate School of Natural Science and Technology, Professor, 大学院・自然科学研究科, 教授 (20019780)
SANO Hiroaki ISHIKAWA National College of Technology, Dept. of Civil Engineering, Assoc. Professor (50187275)
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| Project Period (FY) |
2000 – 2002
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| Keywords | Zeolitization / Coal Fly Ash / Gas Absorption / Carbon Dioxide |
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| Research Abstract |
This study was conducted as a basic research for the development of a new physical absorption method of carbon dioxide. In this study, coal fly ash of industrial waste was transformed into zeolite by alkali treatment. And the zeolite (we call it "zeolitized coal fly ash") was used to absorb carbon dioxide contained in air-carbon dioxide mixing gas considered as flue gases. Natural zeolites and artificial zeolite being on sale were also used for absorbent to compare the absorptivity in the gas absorption experiments.
Phillipsite type zeolites were formed through reaction of coal fly ash with IN NaOH aqueous solution by heating about 90℃ for 16 hours. The zeolitization of coal fly ash was checked by X-ray powder diffraction analysis and cation exchange capacity measurement. Powdery zeolitized coal fly ash was solidified to pellet(7mm in diameter×6mm in height) by heating at low temperature with 'kibushi'clay for binder. Because, upon being heated at high temperature, zeolitized coal fly ash was extinguished the phillipsite type zeolites and disappeared properties of zeolite.
The rate of gas absorption by natural zeolite was four times faster or more than zeolitized coal fly ash. Because natural zeolite was composed of mordenite with larger macropore radius than phillipsite.
It was clarified experimentally that coal fly ash could be applied to absorbent of carbon dioxide effectively.
A new absorption method of carbon dioxide was proposed as a technology for recycling of coal fly ash of industrial waste.
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