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    Phase Equilibrium and Spectroscopic Characterization of CO and C3H8 Binary Clathrate Hydrates

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    무색, 무미(ε‘³)이며 μœ λ…κ°€μŠ€μΈ μΌμ‚°ν™”νƒ„μ†Œ(CO)λŠ” ν”„λ‘œνŒ(C3H8) 및 μ²œμ—°κ°€μŠ€μ˜ λΆˆμ™„μ „ μ—°μ†Œμ— μ˜ν•΄ 생성될 수 μžˆλ‹€. ν™”ν•™κ³΅μ •μ˜ κ΄€μ μ—μ„œ λ³Ό λ•Œ, μΌμ‚°ν™”νƒ„μ†ŒλŠ” ν•©μ„±κ°€μŠ€μ˜ μ£Όμš” μ„±λΆ„μœΌλ‘œ, 가솔린, μ•”λͺ¨λ‹ˆμ•„ 및 λ©”νƒ„μ˜¬κ³Ό 같은 λ‹€μ–‘ν•œ ν™”ν•™λ¬Όμ§ˆμ„ μƒμ‚°ν•˜λŠ” 데 μ€‘μš”ν•œ 쀑간산물이닀. λ³Έ μ—°κ΅¬μ—μ„œλŠ” 클라슀레이트 ν™”ν•™ 및 곡학 λΆ„μ•Όμ—μ„œ μ•„μ§κΉŒμ§€ μ—°κ΅¬λ˜μ§€ μ•Šμ€ μΌμ‚°ν™”νƒ„μ†Œμ™€ ν”„λ‘œνŒ ν˜Όν•©κ°€μŠ€ ν•˜μ΄λ“œλ ˆμ΄νŠΈμ˜ 열역학적 거동과 뢄광학적 νŠΉμ„±μ— λŒ€ν•΄ μ‘°μ‚¬ν•˜μ˜€λ‹€. μΌμ‚°ν™”νƒ„μ†Œ/ν”„λ‘œνŒ ν˜Όν•©κ°€μŠ€ ν•˜μ΄λ“œλ ˆμ΄νŠΈλŠ” 각각 80/20, 60/40, 40/60, 20/80 mol%의 μΌμ‚°ν™”νƒ„μ†Œ/ν”„λ‘œνŒ ν˜Όν•©κ°€μŠ€λ‘œ ν˜•μ„±μ‹œμΌ°λ‹€. μΌμ‚°ν™”νƒ„μ†Œ/ν”„λ‘œνŒ ν˜Όν•©κ°€μŠ€ ν•˜μ΄λ“œλ ˆμ΄νŠΈμ˜ 3상 ν‰ν˜• κ²½κ³„λŠ” κ΄‘λ²”μœ„ν•œ μ˜¨λ„ 및 μ••λ ₯ (200-300 K, 20-30 MPa)μ—μ„œ κ³ μ•• λ°˜μ‘μ…€μ„ μ‚¬μš©ν•˜μ—¬ μΈ‘μ •λ˜μ—ˆλ‹€. μˆœμˆ˜ν•œ μΌμ‚°ν™”νƒ„μ†Œ ν•˜μ΄λ“œλ ˆμ΄νŠΈλŠ” ν˜•μ„± 쑰건에 따라 μ•ˆμ •ν•œ structure II (sII) λ˜λŠ” μ€€μ•ˆμ •ν•œ sturcture I (sI)λ₯Ό ν˜•μ„±ν•˜λŠ” 반면, μˆœμˆ˜ν•œ ν”„λ‘œνŒ ν•˜μ΄λ“œλ ˆμ΄νŠΈλŠ” sIIλ§Œμ„ ν˜•μ„±ν•˜λŠ” κ²ƒμœΌλ‘œ μ•Œλ €μ Έ μžˆλ‹€. Synchrotron X-ray diffraction (XRD)λ₯Ό μ‚¬μš©ν•˜μ—¬ μΌμ‚°ν™”νƒ„μ†Œ/ν”„λ‘œνŒ ν˜Όν•©κ°€μŠ€ ν•˜μ΄λ“œλ ˆμ΄νŠΈμ˜ κ²°μ • ꡬ쑰λ₯Ό ν™•μΈν•˜μ˜€λ‹€. XRD κ²°κ³ΌλŠ” μΌμ‚°ν™”νƒ„μ†Œ/ν”„λ‘œνŒ ν˜Όν•©κ°€μŠ€ ν•˜μ΄λ“œλ ˆμ΄νŠΈκ°€ λͺ¨λ“  λΉ„μœ¨μ˜ κ°€μŠ€μ— λŒ€ν•΄ sII 결정ꡬ쑰λ₯Ό ν˜•μ„±ν•˜λŠ” 것을 λ³΄μ—¬μ£Όμ—ˆλ‹€. Raman spectroscopyλ₯Ό μ΄μš©ν•˜μ—¬ sII ν•˜μ΄λ“œλ ˆμ΄νŠΈ 동곡 내에 μΌμ‚°ν™”νƒ„μ†Œμ™€ ν”„λ‘œνŒ 객체 λΆ„μžμ˜ 포접 μ—¬λΆ€λ₯Ό ν™•μΈν•˜μ˜€λ‹€. μΌμ‚°ν™”νƒ„μ†Œ/ν”„λ‘œνŒ ν˜Όν•©κ°€μŠ€ ν•˜μ΄λ“œλ ˆμ΄νŠΈμ˜ ν¬μ ‘λœ κ°€μŠ€ λΉ„μœ¨ μΈ‘μ • κ²°κ³ΌλŠ” ν”„λ‘œνŒ λΆ„μžκ°€ μΌμ‚°ν™”νƒ„μ†Œ λΆ„μžλ³΄λ‹€ sII ν•˜μ΄λ“œλ ˆμ΄νŠΈμ˜ 동곡을 μš°μ„ μ μœΌλ‘œ μ μœ ν•œλ‹€λŠ” 것을 λ‚˜νƒ€λ‚΄μ—ˆλ‹€. 이 결과듀은 ν•˜μ΄λ“œλ ˆμ΄νŠΈ 기반 κ°€μŠ€ 뢄리 κ³΅μ •μ—μ„œ μΌμ‚°ν™”νƒ„μ†Œμ™€ ν”„λ‘œνŒμ˜ 선택적 뢄리에 쒋은 정보λ₯Ό μ œκ³΅ν•œλ‹€.Carbon monoxide (CO), which is a colorless, tasteless and poisonous gas, can be produced by the incomplete combustion of propane (C3H8) and natural gases. From a point of view of chemical process, CO is a primary component of syngas, which is a crucial intermediate resource in producing a variety of chemicals such as gasoline, ammonia, and methanol. In this study, we investigate thermodynamic behavior and spectroscopic characterization of CO and C3H8 binary clathrate hydrates, which has not yet been studied in the clathrate chemistry and engineering fields. The CO/C3H8 clathrate hydrates were formed from CO/C3H8 gas mixtures of 80/20,60/40,40/60, and 20/80 mol%, respectively. Three-phase equilibrium boundaries of CO/C3H8 clathrate hydrates were measured using a high-pressure cell in a wide range of temperature and pressure (200–300 K and 20–30 MPa). It is known that pure CO hydrate forms stable structure II (sII) or metastable structure I (sI) depending on the formation condition, whereas pure C3H8 hydrate forms only sII. Synchrotron X-ray diffraction (XRD) was used to identify the crystal structure of CO/C3H8 clathrate hydrates. The XRD results reveal that the CO/C3H8 clathrate hydrates show the sII crystalline product for all binary gas mixtures. Raman spectroscopic methods confirm the enclathration of both CO and C3H8 guests in the cages of sII clathrate hydrates. Direct-release measurements of CO/C3H8 clathrate hydrates indicate that C3H8 molecules preferentially occupy the cages of sII clathrate hydrate rather than CO molecules. These results provide good information for selectively separating CO and C3H8 from CO/C3H8 gas mixtures via a hydrate-based gas separation process.1. μ„œ λ‘  1 1.1 연ꡬ배경 및 λͺ©μ  1 1.2 κ°€μŠ€ν•˜μ΄λ“œλ ˆμ΄νŠΈ 3 1.3 μ—°κ΅¬λ‚΄μš© 5 2. κ°€μŠ€ν•˜μ΄λ“œλ ˆμ΄νŠΈ ν•©μ„± 및 연ꡬ방법 6 2.1 κ°€μŠ€ν•˜μ΄λ“œλ ˆμ΄νŠΈ ν•©μ„± 6 2.2 μƒν‰ν˜•κ³‘μ„  μΈ‘μ • 7 2.3 Raman spectroscopy 12 2.4 Synchrotron X-ray diffraction 15 2.5 Gas chromatography analysis 17 3. 연ꡬ결과 20 3.1 μƒν‰ν˜•κ³‘μ„  μΈ‘μ • 20 3.2 Raman spectroscopy 23 3.3 Synchrotron X-ray diffraction 27 3.4 Gas chromatography analysis 29 4. κ²° λ‘  34 κ°μ‚¬μ˜ κΈ€ 35 μ°Έκ³ λ¬Έν—Œ 36Maste

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