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Research Paper

Guest-dependent Structural Transition of Trimethylamine Hydrate

객체 분자에 의한 트리메틸아민 하이드레이트의 구조 변이 분석 연구

Yeobum Youn1
,
Minjun Cha2*
윤 여범1
,
차 민준2*
2Dept. of Energy and Resources Engineering, Kangwon National University
1현대중공업 중앙기술원
2강원대학교 에너지자원공학전공
* Corresponding Author
31 August 2018. pp. 307-313
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Abstract

This paper reports the structural transition of trimethylamine (TMA) hydrate induced by a type of guest molecule. Powder X-ray diffraction patterns of (TMA + H2) hydrates reveal the formation of hexagonal P6/mmm hydrate, but those of (TMA + CH4) hydrates indicate the formation of cubic Fd3m hydrate. Without the gaseous guest molecule, the crystal structure of pure TMA hydrate is identified as hexagonal P6/mmm. Therefore, inclusion of gaseous methane in TMA hydrate can induce a structural transition from hexagonal to cubic hydrate or the formation of a metastable cubic hydrate. To further clarify this possibility, we also check the time-dependent structural patterns of binary (TMA + CH4) hydrates for 1 - 14 days. The results show that the structural transition of TMA hydrate from hexagonal P6/mmm to cubic Fd3m can occur during the methane inclusion process.

Keywords
Hydrate
Structural transition
Guest molecule
Trimethylamine

이 연구에서는 객체 분자의 종류에 따라 발생한 트리메틸아민(TMA) 하이드레이트의 구조 변이에 대한 결과를 확인하였다. X선 회절분석을 통해 얻은 (TMA + H2) 하이드레이트의 패턴은 육방정계 P6/mmm 하이드레이트 형성을 나타냈으며, (TMA + CH4) 하이드레이트의 패턴은 입방정계 Fd3m 하이드레이트의 형성을 나타냈다. 가스가 포집되지 않은 TMA 하이드레이트의 경우 육방정계의 구조를 나타내기 때문에, 메탄가스의 포집은 TMA 하이드레이트의 구조 변이 혹은 준안정한 입방정계 구조의 형성을 의미한다고 볼 수 있다. 이 가능성을 확실하게 검증하기 위해 시간에 따라 (TMA + CH4) 하이드레이트를 형성하여 X선 회절분석을 실시하였으며, 메탄가스의 포집에 따라 TMA 하이드레이트는 육방정계로부터 입방정계로 구조 변이가 발생함을 확인하였다.

키워드
하이드레이트
구조 변이
객체 분자
트리메틸아민
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Information
  • Publisher :The Korean Society of Mineral and Energy Resources Engineers
  • Publisher(Ko) :한국자원공학회
  • Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
  • Journal Title(Ko) :한국자원공학회지
  • Volume : 55
  • No :4
  • Pages :307-313
  • Received Date : 2018-07-11
  • Revised Date : 2018-08-17
  • Accepted Date : 2018-08-29
  • DOI :https://doi.org/10.32390/ksmer.2018.55.4.307
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