scholarly journals Spectroscopic Identification on CO2 Separation from CH4 + CO2 Gas Mixtures Using Hydroquinone Clathrate Formation

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4068
Author(s):  
Ji-Ho Yoon ◽  
Dongwon Lee ◽  
Jong-Won Lee
Keyword(s):  
Gas Mixtures ◽  
Co2 Separation ◽  
Gas Composition ◽  
Formation Pressure ◽  
Co2 Gas ◽  
Clathrate Formation ◽  
Spectroscopic Identification ◽  
Ch4 Concentration ◽  
Mixed Gases ◽  
Landfill Gases

The formation of hydroquinone (HQ) clathrate and the guest behaviors of binary (CH4 + CO2) gas mixtures were investigated by focusing on an application to separate CO2 from landfill gases. Spectroscopic measurements show that at two experimental pressures of 20 and 40 bar, CO2 molecules are preferentially captured in HQ clathrates regardless of the gas composition. In addition, preferential occupation by CO2 is observed more significantly when the formation pressure and the CH4 concentration are lower. Because the preferential occupation of CO2 is found with binary (CH4 + CO2) gas mixtures regardless of the composition of the feed gas, a clathrate-based process can be applied to CO2 separation or concentration from landfill gases or (CH4 + CO2) mixed gases.

scholarly journals New mechanism insight for the hydrogenation of CO/CO2 gas mixtures to hydrocarbons over iron-based catalyst

2021 ◽  
Vol 152 ◽  
pp. 106284
Author(s):  
Sandeep Badoga ◽  
Michela Martinelli ◽  
Muthu Kumaran Gnanamani ◽  
Young Koh ◽  
Wilson D. Shafer
Keyword(s):  
Gas Mixtures ◽  
Co2 Gas ◽  
Iron Based ◽  
Hydrogenation Of Co

Systematic investigation of plasma emission spectra during microwave diamond deposition from CH4CO2 and C2H2CO2 gas mixtures

1993 ◽  
Vol 2 (2-4) ◽  
pp. 389-392 ◽  
Author(s):  
G. Balestrino ◽  
M. Marinelli ◽  
E. Milani ◽  
A. Paoletti ◽  
P. Paroli ◽  
...  
Keyword(s):  
Emission Spectra ◽  
Gas Mixtures ◽  
Systematic Investigation ◽  
Plasma Emission ◽  
Diamond Deposition ◽  
Co2 Gas

Hydrate Phase Equilibrium of CH4+N2+CO2 Gas Mixtures and Cage Occupancy Behaviors

2017 ◽  
Vol 56 (28) ◽  
pp. 8133-8142 ◽  
Author(s):  
You-Hong Sun ◽  
Sheng-Li Li ◽  
Guo-Biao Zhang ◽  
Wei Guo ◽  
You-Hai Zhu
Keyword(s):  
Phase Equilibrium ◽  
Gas Mixtures ◽  
Co2 Gas ◽  
Hydrate Phase

scholarly journals Validation of spectroscopic gas analyzer accuracy using gravimetric standard gas mixtures: Impact of background gas composition on CO<sub>2</sub> quantitation by cavity ring-down spectroscopy

2017 ◽  
Author(s):  
Jeong Sik Lim ◽  
Miyeon Park ◽  
Jinbok Lee ◽  
Jeongsoon Lee
Keyword(s):  
Ambient Air ◽  
Gas Mixtures ◽  
Gas Composition ◽  
Optical Intensity ◽  
Negative Deviation ◽  
Gas Analyzer ◽  
Pressure Broadening ◽  
Background Gas ◽  
Standard Gas Mixtures ◽  
Cavity Ring Down

Abstract. Effect of background gas composition on the measurement of CO2 levels was investigated by wavelength-scanned cavity ring-down spectrometry (WS-CRDS) employing a spectral line centered at the R(1) of the (3 0° 1)III ← (0 0 0) band. For this purpose, eight cylinders with various gas compositions were gravimetrically and manometrically prepared within 2σ = 0.1 %, and these gas mixtures were introduced into the WS-CRDS analyzer calibrated against standards of ambient air composition. Depending on the gas composition, deviations between CRDS-determined and gravimetrically (or manometrically) assigned CO2 concentrations ranged from −9.77 to 5.36 μmol/mol, e.g., excess N2 exhibited a negative deviation, whereas excess Ar showed a positive one. The total pressure broadening coefficients (TBPCs) obtained from the composition of N2, O2 and Ar thoroughly corrected the deviations up to −0.5–0.6 μmol/mol, while these values were −0.43–1.43 μmol/mol considering PBCs induced by only N2. The use of TBPCs enhanced deviations to be corrected to ~ 0.15 %. Furthermore, the above correction linearly shifted CRDS responses for a wide extent of TPBCs ranging from 0.065 to 0.081 cm−1 atm−1. Thus, accurate measurements using optical intensity-based techniques such as WS-CRDS require TBPC-based instrument calibration.

Methods of Improving Glow-Discharge-Deposited a-Si1−xGex:H

1991 ◽  
Vol 219 ◽  
Author(s):  
Y. S. Tsuo ◽  
Y. Xu ◽  
E. A. Ramsay ◽  
R. S. Crandall ◽  
S. J. Salomon ◽  
...  
Keyword(s):  
Material Processing ◽  
Glow Discharge ◽  
Substrate Temperature ◽  
Gas Mixtures ◽  
Gas Composition ◽  
Processing Methods ◽  
Helium 4 ◽  
Process Gas

ABSTRACTWe have studied methods of improving glow-discharge-deposited a-Si1−x Gex :H alloys deposited using silane and germane gas mixtures. Material processing methods studied include (1) varying the substrate temperature from 170° to 280°C, (2) varying the process gas composition and pressure, (3) dilution of the feed gas by hydrogen, argon, or helium, (4) enhancing etching during deposition by adding small amounts of XeF2 vapor into the process gas, and (5) postdeposition annealing and/or hydrogenation.

scholarly journals Non-linear Kinetic Analysis of Decarburization and Deoxidization of Liquid Iron by Ar-CO-CO2 Gas Mixtures.

1999 ◽  
Vol 39 (4) ◽  
pp. 301-308 ◽  
Author(s):  
Tao Xiaojie ◽  
Hiroyuki Fukuyama ◽  
Masahiro Susa ◽  
Kazuhiro Nagata
Keyword(s):  
Kinetic Analysis ◽  
Liquid Iron ◽  
Gas Mixtures ◽  
Co2 Gas ◽  
Non Linear ◽  
Linear Kinetic

An isolated upper airway preparation in conscious dogs

1986 ◽  
Vol 60 (6) ◽  
pp. 2123-2127 ◽  
Author(s):  
L. Y. Lee ◽  
R. F. Morton ◽  
M. J. McIntosh ◽  
J. A. Turbek
Keyword(s):  
Breathing Circuit ◽  
Upper Airway ◽  
Gas Mixtures ◽  
Conscious Dogs ◽  
Breathing Patterns ◽  
Simple Modification ◽  
Co2 Gas ◽  
Flow Through ◽  
Gas Medium ◽  
Irregular Breathing

The purpose of this study was to develop an isolated upper airway preparation in conscious dogs. Each of the four dogs was trained to wear an individually fitted respiratory mask and surgically prepared with two side-hole tracheostomies. After full recovery, one endotracheal tube was inserted caudally into the lower tracheostomy hole and another tube cranially into the upper tracheostomy. When the two endotracheal tubes were connected to a breathing circuit including a box-balloon system, the magnitude and pattern of the inspiratory flow through the upper airway were identical to that inhaled spontaneously into the lungs by the dogs, but the gas medium inhaled into the upper airway could be independently controlled. Thus it allowed test gas mixtures to be inhaled spontaneously through an isolated upper airway. One limitation was that the inspired gas remained in the upper airway during expiration, but this can be corrected by a simple modification of the breathing circuit. This preparation was tested in studying the respiratory effects of upper airway exposure to CO2 gas mixtures. Our results showed small but significant reduction in both rate and volume of respiration when the concentration of CO2 gas mixture inhaled through the upper airway exceeded 5%. Irregular breathing patterns were frequently elicited in these dogs by higher concentrations (greater than 12%) of CO2.

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