Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Synthesis of Sodalite from Water Glass: Effect of the Composition of Synthetic Mixtures on Its Crystallinity and Crystallite Size

물유리에서 소달라이트의 합성: 합성모액 조성이 결정화도와 입자 크기에 미치는 영향

  • Bae, Song Eun (School of Applied Chemical Engineering and the Institute for Catalysis Research, Chonnam National University) ;
  • Seo, Gon (School of Applied Chemical Engineering and the Institute for Catalysis Research, Chonnam National University) ;
  • Song, Mee Kyung (Bioinformatics and Molecular Design Research Center) ;
  • No, Kyoung Tai (Department of Biotechnology, Yonsei University)
  • 배송은 (전남대학교 응용화학공학부) ;
  • 서곤 (전남대학교 응용화학공학부) ;
  • 송미경 ((사)분자설계연구소 신소재설계팀) ;
  • 노경태 (연세대학교 생명공학과)
  • Received : 2009.05.06
  • Accepted : 2009.06.08
  • Published : 2009.08.31
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Abstract

The effects of $Na_2O$, $SiO_2$ and $H_2O$ contents of the synthetic mixtures prepared from water glass on the crystallinity and crystallite size of sodalite were studied. The composition of the synthetic mixtures described by $x\;Na_2O{\cdot}y\;SiO_2{\cdot}Al_2O_3{\cdot}z\;H_2O$ was varied within x=2.5~7.5, y=1.4~3.0, z=140~400. The hydrothermal reaction was carried out at $140^{\circ}C$ for 2 days. High content of $Na_2O$ resulted in the high crystallinity and small crystallite of sodalite. The $SiO_2/Al_2O_3$ molar ratios of around 2 were suitable for the synthesis of sodalite, and produced zeolite species were varied by the $H_2O$ content. Sodalite was mainly obtained with a high crystallinity from the synthetic mixtures with $SiO_2/Al_2O_3$ molar ratio of around 2 and high content of $Na_2O$. The high content of sodium ions caused a decrease in the particle sizes because of their role of structure directing agent.

물유리로 제조한 알칼리성 실리카-알루미나 합성모액에서 $Na_2O$, $SiO_2$, $H_2O$ 함량이 소달라이트의 결정화도와 입자크기에 미치는 영향을 조사하였다. x=2.5~7.5, y=1.4~3.0, z=140~400 범위에서 한 성분의 함량만 바꾸어 제조한 $x\;Na_2O{\cdot}y\;SiO_2{\cdot}Al_2O_3{\cdot}z\;H_2O$ 조성의 합성모액을 $140^{\circ}C$에서 2일간 수열 반응시켜 소달라이트를 합성하였다. $Na_2O$ 함량이 많아지면 소달라이트의 결정화도가 높아지나 입자는 작아졌다. 합성모액의 $SiO_2/Al_2O_3$ 몰비가 2 근처에서 소달라이트가 생성되었으며, 물의 함량이 달라지면 합성되는 제올라이트의 종류가 달라졌다. 이 합성조건에서는 $SiO_2/Al_2O_3$ 몰비가 2.0 근처이고, $Na_2O$ 함량이 많은 영역에서는 결정화도가 높은 소달라이트가 합성되었으며, 나트륨 이온의 구조유도체로서 효과로 입자 크기는 작아졌다.

Keywords

Acknowledgement

Supported by : 에너지자원기술기획평가원(KETEP)

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