Quantitative Analysis of Main Components of Natural Gas Based on Raman Spectroscopy

Gao, Ying; Dai, Liankui; Zhu, Hua-dong; Chen, Yunliang; Zhou, Li

doi:10.1016/s1872-2040(18)61135-1

Cited by 45 publications

(17 citation statements)

References 6 publications

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“…It is present in atmospheric air, often found in inclusions in minerals, and is also the dominant component of natural gas. Development of Raman gas analysis [1][2][3][4][5][6][7][8][9] brings up the need of information that allows taking into account changes in the methane Raman spectrum under various conditions (temperature, pressure, environment). At present, shifts and broadenings of its fundamental bands [10][11][12][13][14][15], as well as changes in the ratio of peak intensities [13,[15][16][17] are known.…”

Section: Introductionmentioning

confidence: 99%

Depolarization Ratios of Methane Raman Bands as a Function of Pressure

Petrov

2020

Molecules

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In this work, we measured the intensities of Q-branches of the ν 1 , ν 2 and ν 3 bands in the polarized and depolarized methane Raman spectra in the pressure range of 1-60 atm. It was established that the pressure dependence of depolarization ratios of the ν 2 and ν 3 bands are negligible. In turn, the depolarization ratio of the ν 1 band increases with increasing pressure and reaches approximately 0.0045 at 60 atm. These data are more precise than previously published ones because ν 1 band intensities were determined taking into account the contribution of overlapping lines of ν 3 band. The presented data will be useful in calculating the methane polarizabilities at high pressure, as well as in calculating methane Raman spectra for measuring the natural gas composition using Raman spectroscopy.

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Section: Introductionmentioning

confidence: 99%

Depolarization Ratios of Methane Raman Bands as a Function of Pressure

Petrov

2020

Molecules

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“…It should be noted that the signal-to-noise ratio is no worse than that obtained with the use of laboratory Raman setups in the course of long time signal collection at an excitation laser power of several watts. 7,27 Moreover, the analysis was always performed at 1 atm pressure, which emulates real conditions of gas analysis for many important applications. High-pressure measurement is a more straightforward task since the Raman signal intensity increases proportionally to pressure.…”

Section: Resultsmentioning

confidence: 99%

“…This disadvantage explains the choice of laser power at tens of watts and scattering signal collection times at tens of minutes to achieve a satisfactory signal for the quantitative characterization of natural gas. 7,8 Such powerful laser systems with long acquisition time are inadequate in the field conditions. In recent years, new methodological approaches have been developed and tested to mitigate these limitations.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Natural Gas Using a Portable Hollow-Core Photonic Crystal Coupled Raman Spectrometer

et al. 2020

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“…The key advantages of this method are the simultaneous control of all molecular species, including homonuclear diatomic molecules such as H 2 , N 2 , O 2 , etc., whose concentration exceeds the detection limit of the instrument, high selectivity, absence of consumables, and the possibility of real-time measurements. The potential of this method has been demonstrated for determination of composition of fuel gases such as natural gas, [12][13][14][15][16][17][18] biogas, 19,20 and syngas. 21 Previously, we studied changes in the Raman spectra of CO-CO 2 -H 2 -CH 4 mixtures as a function of pressure and molecular environment.…”

Section: Introductionmentioning

confidence: 99%