Selective Encaging of N2O in N2O N-2 Binary Gas Hydrates via Hydrate-Based Gas Separation SCIE SCOPUS

Cited 24 time in WEB OF SCIENCE Cited 24 time in Scopus
Title
Selective Encaging of N2O in N2O N-2 Binary Gas Hydrates via Hydrate-Based Gas Separation
Author(s)
Yang, Youjeong; Shin, Donghoon; Choi, Seunghyun; Woo, Yesol; Lee, Jong -Won; Kim, Dongseon; Shin, Hee-Young; Cha, Minjun; Yoon, Ji-Ho
KIOST Author(s)
Kim, Dong Seon(김동선)
Publication Year
2017-03-21
Abstract
The crystal structure and guest inclusion behaviors of nitrous oxide nitrogen (N2O N-2) binary gas hydrates formed from N2O/N-2 gas mixtures are determined through spectroscopic analysis. Powder X-ray diffraction results indicate that the crystal structure of all the N2O N-2 binary gas hydrates is identified as the structure I (sI) hydrate. Raman spectra for the N2O N2 binary gas hydrate formed from N2O/N-2 (80/20, 60/40, 40/60 mol %) gas mixtures reveal that N2O molecules occupy both large and small cages of the sI hydrate. In contrast, there is a single Raman band of N2O molecules for the N2O N2 binary gas hydrate formed from the N2O/N-2 (20/80 mol %) gas mixture, indicating that N2O molecules are trapped in only large cages of the sI hydrate. From temperature-dependent Raman spectra and the Predictive Soave-Redlich-Kwong (PSRK) model calculation, we confirm the self-preservation of N2O N-2 binary gas hydrates in the temperature range of 210-270 K. Both the experimental measurements and the PSRK model calculations demonstrate the preferential occupation of N2O molecules rather than N2 molecules in the hydrate cages, leading to a possible process for separating N2O from gas mixtures via hydrate formation. The phase equilibrium conditions, pseudo-pressure composition (P-x) diagram, and gas storage capacity of N2O N-2 binary gas hydrates are discussed in detail.
ISSN
0013-936X
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/1270
DOI
10.1021/acs.est.6b05978
Bibliographic Citation
ENVIRONMENTAL SCIENCE & TECHNOLOGY, v.51, no.6, pp.3550 - 3557, 2017
Publisher
AMER CHEMICAL SOC
Subject
VAPOR-LIQUID-EQUILIBRIA; NATURAL-GAS; CARBON-DIOXIDE; RAMAN-SPECTRA; NITROUS-OXIDE; SPECTROSCOPIC IDENTIFICATION; THERMODYNAMIC STABILITY; CO2; PSRK; 21ST-CENTURY
Type
Article
Language
English
Document Type
Article
Publisher
AMER CHEMICAL SOC
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