본문 바로가기
HOME> 논문 > 논문 검색상세

학위논문 상세정보

알칼리 금속계 흡수제의 CO₂흡수·재생 특성 원문보기

  • 저자

    최보윤

  • 학위수여기관

    慶北大學校

  • 학위구분

    국내석사

  • 학과

    화학공학과 화학공학전공

  • 지도교수

  • 발행년도

    2005

  • 총페이지

    viii, 98 p.

  • 키워드

    알칼리 금속계 흡수제;CO₂흡수력;

  • 언어

    kor

  • 원문 URL

    http://www.riss.kr/link?id=T10062294&outLink=K  

  • 초록

    The alkali metal based sorbents were prepared by impregnation of alkali metal carbonate or bicarbonate to various supports such as activated carbon (AC), Al2O3, and MgO. The CO₂ capture capacities and regeneration properties were measured in the presence of H₂O (1.3 vol%, 5 vol%, and 9 vol%) in a fixed bed reactor during multiple cycles at various temperature conditions (CO₂ capture at 40-100℃ and regeneration at 150-400℃). The concentration of water in the CO₂ absorption process and in the pretreatment (1.3 vol%, 5 vol%, and 9 vol%) plays an important role in the CO₂ capture capacity. In particular, the pretreatment with sufficient water before CO₂ capture must be always carried out to increase the total CO₂ capture capacity of sorbent and the rate of CO₂ absorption. These results were explained by the formation of the new active sites defined as K₂CO₃ㆍ1.5 H₂O from X-ray diffraction. The regeneration properties of sorbents were evaluated by observing the amount of CO₂ desorbed by heating at 150-400℃. The sorbents, K₂CO₃/AC, K₂CO₃/MgO, and K₂CO₃/Al₂O₃, were completely regenerated at 150℃, 350℃, and 400℃, respectively. To understand the regeneration property in detail, a TPD test was performed after CO₂ absorption at 60℃. The test was carried out by measuring the concentration of CO₂ desorbed when the temperature ramping rate was 1 ℃/min. Only one CO₂ peak in the TPD was found in the case of K₂CO₃/AC and K₂CO₃/MgO. The peak temperatures of K₂CO₃/AC and K₂CO₃/MgO were at about 130℃ and 360℃, respectively. However, two CO₂ peaks were observed in the TPD result for K₂CO₃/Al₂O₃. One peak was found at 106℃ and the other was observed at temperature above 290℃. XRD pattern of K₂ CO₃/AC after CO₂ absorption showed only KHCO₃ crystal structure which could be easily regenerated at low temperature like 150℃. XRD pattern of K₂ CO₃/MgO after CO₂ absorption also showed one phase which was assigned to K₂ Mg(CO₃)2. While, XRD pattern of K₂CO₃/Al2O3 sorbent after CO₂ absorption showed two phases assigned KHCO₃ and KAl(CO₃ )₂(OH)₂ phase. The decrease in the CO₂ capture capacity of K₂ CO₃/Al2O3 and K₂CO₃/MgO after regeneration at lower temperature than 250℃ could be explained through the formation of KAl(CO₃)₂(OH)₂ and K₂Mg(CO₃)₂, respectively, which was not completely converted to the original K₂ CO₃ phase.


 활용도 분석

  • 상세보기

    amChart 영역
  • 원문보기

    amChart 영역