scholarly journals Microscopic Insights into the Effect of the Initial Gas–Liquid Interface on Hydrate Formation by In-Situ Raman in the System of Coalbed Methane and Tetrahydrofuran

ACS Omega ◽  
2021 ◽  
Author(s):  
Jing Cai ◽  
Tao Lv ◽  
Xiao-Sen Li ◽  
Chun-Gang Xu ◽  
Nicolas von Solms ◽  
...  
Keyword(s):  
Coalbed Methane ◽  
Hydrate Formation ◽  
Liquid Interface ◽  
In Situ Raman

scholarly journals Analysis of the Dissolution of CH4/CO2-Mixtures into Liquid Water and the Subsequent Hydrate Formation via In Situ Raman Spectroscopy

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 793
Author(s):  
Zheng Li ◽  
Christine C. Holzammer ◽  
Andreas S. Braeuer
Keyword(s):  
Raman Spectroscopy ◽  
Liquid Water ◽  
Separation Efficiency ◽  
Batch Reactor ◽  
Hydrate Formation ◽  
In Situ Raman Spectroscopy ◽  
Rich Phase ◽  
In Situ Raman ◽  
Carbon Dioxide Co2

We report an experimental study for the investigation into the suitability of hydrate formation processes for the purification of methane (CH4) from carbon dioxide (CO2) at a sub-cooling temperature of 6 K and a pressure of 4 MPa. The experiments were conducted in a stirred batch reactor. Three different initial CH4/CO2 mixtures with methane fractions of 70.1 mol%, 50.3 mol%, and 28.5 mol% were tested. The separation efficiency was quantified by measuring in situ via Raman spectroscopy the ratios of CH4/CO2 in the gas mixture, the liquid water-rich phase before hydrate formation, and the solid hydrate phase after the onset of the hydrate formation. The results indicated that the main separation effect is obtained due to the preferential dissolution of CO2 into the liquid water-rich phase before the onset of the hydrate formation.

scholarly journals In-situ Raman and kinetic study on the methane hydrate formation and decomposition

2019 ◽  
Vol 158 ◽  
pp. 5615-5621 ◽  
Author(s):  
Seong Jun Cho ◽  
Truong Lam Son Hai ◽  
Ju Dong Lee
Keyword(s):  
Kinetic Study ◽  
Methane Hydrate ◽  
Hydrate Formation ◽  
In Situ Raman

scholarly journals Multiscale analysis of the hydrate based carbon capture from gas mixtures containing carbon dioxide

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Xuebing Zhou ◽  
Xiaoya Zang ◽  
Zhen Long ◽  
Deqing Liang
Keyword(s):  
Flue Gas ◽  
Carbon Capture ◽  
Gas Adsorption ◽  
Hydrate Formation ◽  
Saturation State ◽  
Line Shapes ◽  
In Situ Raman ◽  
Preferential Adsorption ◽  
Gas System

AbstractTo reveal the kinetic performance of gas molecules in hydrate growth, hydrate formation from pure CO2, flue gas, and biogas was measured using in-situ Raman and macroscopic methods at 271.6 K. In the in-situ Raman measurements, Raman peaks of gases in the hydrate phase were characterised and normalised by taking the water bands from 2800 to 3800 cm−1 as a reference, whose line shapes were not found to have a noticeable change in the conversion from Ih ice to sI hydrate. The hydrate growth was suggested to start with the formation of unsaturated hydrate nuclei followed by gas adsorption. In hydrate formed from all tested gases, CO2 concentrations in hydrate nuclei were found to be 23–33% of the saturation state. In the flue gas system, the N2 concentration reached a saturation state once hydrate nuclei formed. In the biogas system, competitive adsorption of CH4 and CO2 molecules was observed, while N2 molecules hardly evolved in hydrate formation. Combined with micro- and macroscopic analysis, small molecules such as N2 and CO2 were suggested to be more active in the formation of hydrate nuclei, and the preferential adsorption of CO2 molecules took place in the subsequent gas adsorption process.

Insights into the Kinetics of Methane Hydrate Formation in a Stirred Tank Reactor by In Situ Raman Spectroscopy

2015 ◽  
Vol 3 (9) ◽  
pp. 925-934 ◽  
Author(s):  
Jong Min Lee ◽  
Seong Jun Cho ◽  
Ju Dong Lee ◽  
Praveen Linga ◽  
Kyung Chan Kang ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Methane Hydrate ◽  
Hydrate Formation ◽  
Stirred Tank ◽  
In Situ Raman Spectroscopy ◽  
Stirred Tank Reactor ◽  
Tank Reactor ◽  
In Situ Raman ◽  
Kinetics Of

“In-Situ Raman Spectroscopy of Electronic Processes in Fullerene Thin Films

2002 ◽  
Vol 725 ◽  
Author(s):  
S.B. Phelan ◽  
B.S. O'Connell ◽  
G. Farrell ◽  
G. Chambers ◽  
H.J. Byrne
Keyword(s):  
Thin Film ◽  
Indium Tin Oxide ◽  
Low Temperatures ◽  
In Situ Raman Spectroscopy ◽  
State Reduction ◽  
In Situ Raman ◽  
Linear Behavior ◽  
Current Voltage ◽  
Solid State Reduction

AbstractThe current voltage characteristics of C60 thin film sandwich structures fabricated by vacuum deposition on indium tin oxide (ITO) with an aluminium top electrode are presented and discussed. A strongly non-linear behavior and a sharp increase in the device conductivity was observed at relatively low voltages (∼2V), at both room and low temperatures (20K). At room temperature the system is seen to collapse, and in situ Raman measurements indicate a solid state reduction of the fullerene thin film to form a polymeric state. The high conductivity state was seen to be stable at elevated voltages and low temperatures. This state is seen to be reversible with the application of high voltages. At these high voltages the C60 film was seen to sporadically emit white light at randomly localized points analogous to the much documented Electroluminescence in single crystals.

In Situ Raman Spectroscopy Studies on La2CaB10O19 Crystal Growth

2020 ◽  
Vol 20 (10) ◽  
pp. 6604-6609
Author(s):  
Shanshan Liu ◽  
Guochun Zhang ◽  
Kai Feng ◽  
Yanyang Han ◽  
Tao He ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Crystal Growth ◽  
In Situ Raman Spectroscopy ◽  
In Situ Raman ◽  
Spectroscopy Studies
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