Structural Transition Induced by CH4 Enclathration and Cage Expansion with Large Guest Molecules Occurring in Amine Hydrate Systems
Two isomers of C2H7N, dimethylamine (DMA) and ethylamine (EA), are known to be clathrate hydrate formers by themselves. Here we introduced methane gas as a secondary guest into both dimethylamine and ethylamine clathrate hydrates and identified their structural transitions using powder X-ray diffrac...
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Online Access: | http://hdl.handle.net/10203/189400 https://doi.org/10.1021/je500167n |
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ftkoasas:oai:koasas.kaist.ac.kr:10203/189400 2023-05-15T17:12:01+02:00 Structural Transition Induced by CH4 Enclathration and Cage Expansion with Large Guest Molecules Occurring in Amine Hydrate Systems Youn, Y Youn, Yeobum Seol, J Seol, Jiwoong Cha, M Cha, Minjun Ahn, YH Ahn, Yun-Ho Lee, H Lee, Huen 201406 http://hdl.handle.net/10203/189400 https://doi.org/10.1021/je500167n ENG eng AMER CHEMICAL SOC MIXED-GAS HYDRATE; CLATHRATE HYDRATE; SPECTROSCOPIC OBSERVATION; TERT-BUTYLAMINE; RAMAN; TRANSFORMATION; METHANE; CONDUCTIVITY; INCLUSION; SPECTRA ARTICLE A 2014 ftkoasas https://doi.org/10.1021/je500167n 2014-11-28T00:53:39Z Two isomers of C2H7N, dimethylamine (DMA) and ethylamine (EA), are known to be clathrate hydrate formers by themselves. Here we introduced methane gas as a secondary guest into both dimethylamine and ethylamine clathrate hydrates and identified their structural transitions using powder X-ray diffraction (PXRD) and solid-state NMR spectroscopy. We observed the structural transitions of amine clathrate hydrates from expanded structure I (cubic Pm3n) to structure II (cubic Fd3m). In addition, from experimental results obtained through neutron powder diffraction (NPD) and PXRD, we found that neither temperature nor pressure affected the hydrate structural transition. Raman spectroscopy was used to identify the structural transition occurring in these amine clathrate hydrate systems. In addition, we measured the hydrate equilibrium conditions for amine-water-methane hydrates. The DMA and EA act as hydrate inhibitors in DMA/EA + H2O + CH4 hydrate systems compared with pure methane hydrate over our experimental pressure and temperature ranges. Article in Journal/Newspaper Methane hydrate Korea Advanced Institute of Science and Technology: KOASAS - KAIST Open Access Self-Archiving System Journal of Chemical & Engineering Data 59 6 2004 2012 |
institution |
Open Polar |
collection |
Korea Advanced Institute of Science and Technology: KOASAS - KAIST Open Access Self-Archiving System |
op_collection_id |
ftkoasas |
language |
English |
topic |
MIXED-GAS HYDRATE; CLATHRATE HYDRATE; SPECTROSCOPIC OBSERVATION; TERT-BUTYLAMINE; RAMAN; TRANSFORMATION; METHANE; CONDUCTIVITY; INCLUSION; SPECTRA |
spellingShingle |
MIXED-GAS HYDRATE; CLATHRATE HYDRATE; SPECTROSCOPIC OBSERVATION; TERT-BUTYLAMINE; RAMAN; TRANSFORMATION; METHANE; CONDUCTIVITY; INCLUSION; SPECTRA Youn, Y Youn, Yeobum Seol, J Seol, Jiwoong Cha, M Cha, Minjun Ahn, YH Ahn, Yun-Ho Lee, H Lee, Huen Structural Transition Induced by CH4 Enclathration and Cage Expansion with Large Guest Molecules Occurring in Amine Hydrate Systems |
topic_facet |
MIXED-GAS HYDRATE; CLATHRATE HYDRATE; SPECTROSCOPIC OBSERVATION; TERT-BUTYLAMINE; RAMAN; TRANSFORMATION; METHANE; CONDUCTIVITY; INCLUSION; SPECTRA |
description |
Two isomers of C2H7N, dimethylamine (DMA) and ethylamine (EA), are known to be clathrate hydrate formers by themselves. Here we introduced methane gas as a secondary guest into both dimethylamine and ethylamine clathrate hydrates and identified their structural transitions using powder X-ray diffraction (PXRD) and solid-state NMR spectroscopy. We observed the structural transitions of amine clathrate hydrates from expanded structure I (cubic Pm3n) to structure II (cubic Fd3m). In addition, from experimental results obtained through neutron powder diffraction (NPD) and PXRD, we found that neither temperature nor pressure affected the hydrate structural transition. Raman spectroscopy was used to identify the structural transition occurring in these amine clathrate hydrate systems. In addition, we measured the hydrate equilibrium conditions for amine-water-methane hydrates. The DMA and EA act as hydrate inhibitors in DMA/EA + H2O + CH4 hydrate systems compared with pure methane hydrate over our experimental pressure and temperature ranges. |
format |
Article in Journal/Newspaper |
author |
Youn, Y Youn, Yeobum Seol, J Seol, Jiwoong Cha, M Cha, Minjun Ahn, YH Ahn, Yun-Ho Lee, H Lee, Huen |
author_facet |
Youn, Y Youn, Yeobum Seol, J Seol, Jiwoong Cha, M Cha, Minjun Ahn, YH Ahn, Yun-Ho Lee, H Lee, Huen |
author_sort |
Youn, Y Youn, Yeobum |
title |
Structural Transition Induced by CH4 Enclathration and Cage Expansion with Large Guest Molecules Occurring in Amine Hydrate Systems |
title_short |
Structural Transition Induced by CH4 Enclathration and Cage Expansion with Large Guest Molecules Occurring in Amine Hydrate Systems |
title_full |
Structural Transition Induced by CH4 Enclathration and Cage Expansion with Large Guest Molecules Occurring in Amine Hydrate Systems |
title_fullStr |
Structural Transition Induced by CH4 Enclathration and Cage Expansion with Large Guest Molecules Occurring in Amine Hydrate Systems |
title_full_unstemmed |
Structural Transition Induced by CH4 Enclathration and Cage Expansion with Large Guest Molecules Occurring in Amine Hydrate Systems |
title_sort |
structural transition induced by ch4 enclathration and cage expansion with large guest molecules occurring in amine hydrate systems |
publisher |
AMER CHEMICAL SOC |
publishDate |
2014 |
url |
http://hdl.handle.net/10203/189400 https://doi.org/10.1021/je500167n |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_doi |
https://doi.org/10.1021/je500167n |
container_title |
Journal of Chemical & Engineering Data |
container_volume |
59 |
container_issue |
6 |
container_start_page |
2004 |
op_container_end_page |
2012 |
_version_ |
1766068777301049344 |