Absorption cross-section measurements of methane, ethane, ethylene and methanol at high temperatures

Alrefae, Majed A.; Es-sebbar, Et-touhami; Farooq, Aamir

doi:10.1016/j.jms.2014.06.007

Cited by 40 publications

(18 citation statements)

References 25 publications

(38 reference statements)

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“…This is within 0.3% of the average values contained in Table 3. An independent quality check can be made by compar-ing to new C 2 H 6 absorption cross sections recorded for combustion applications [45]. These data contain medium resolution (0.16-0.6 cm −1 ) nitrogenbroadened cross sections of C 2 H 6 between 2500 and 3400 cm −1 .…”

Section: Discussionmentioning

confidence: 99%

“…However, the intended use of these data are for the study of the Earth's atmosphere and will give an incorrect radiative transfer when applied to high temperature environments. High-temperature absorption cross sections of hydrocarbon species (including C 2 H 6 ) have been recorded for combustion applications [45] at relatively low resolution (≥0.16 cm −1 ) and are not sufficient for high-resolution applications.…”

Section: Introductionmentioning

confidence: 99%

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Relative high-resolution absorption cross sections of C2H6 at low temperatures

Hargreaves

Bernath

Appadoo

2015

Journal of Molecular Spectroscopy

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Infrared absorption cross sections near 3.3 µm have been obtained for ethane, C 2 H 6 . These were acquired at elevated temperatures (up to 773 K) using a Fourier transform infrared spectrometer and tube furnace with a resolution of 0.005 cm −1 . The integrated absorption was calibrated using composite infrared spectra taken from the Pacific Northwest National Laboratory (PNNL). These new measurements are the first high-resolution infrared C 2 H 6 cross sections at elevated temperatures.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Relative high-resolution absorption cross sections of C2H6 at low temperatures

Hargreaves

Bernath

Appadoo

2015

Journal of Molecular Spectroscopy

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“…For C 2 H 6 , the strongest lines in this spectral region originate from the R Q K lines from the v 7 band, but the spectrum also contains weaker P and R branch lines from the v 7 band and lines from the v 1 and v 10 bands . The HITRAN line list of vibrational transitions for C 2 H 6 is not complete in this spectral region, containing only information for the strongest R Q K branch lines of the v 7 band.…”

Section: Methodsmentioning

confidence: 97%

“…The utilization of fused silica glass as the inside wall of the electronic heater is to avoid catalyst effects. The pyrolysis and thermal decomposition of the hydrocarbons in the gas flow was assumed to be negligible for the temperatures and flow speeds used in these experiments …”

Section: Methodsmentioning

confidence: 99%

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Investigation of ro‐vibrational spectra of small hydrocarbons at elevated temperatures using infrared degenerate four‐wave mixing

Sahlberg

Zhou

Aldén

et al. 2016

J Raman Spectroscopy

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The ro-vibrational spectra around 3 μm of four small hydrocarbons (C 2 H 2 , CH 4 , C 2 H 6 and C 2 H 4 ) at 296, 550 and 820 K have been investigated using infrared degenerate four-wave mixing (IR-DFWM). The spectra were recorded in gas flows of nitrogen with small admixtures of the hydrocarbons. A fused silica glass tube surrounded by an electric heating wire was used to heat the gas flows. The recorded IR-DFWM spectra are compared with simulations using the spectral information available in the HITRAN database, in order to identify spectral lines. The measurements demonstrate good signal to noise ratio and good sensitivity even at elevated temperatures. Several weak hot lines were detected that are not included in the current database. This paper demonstrates the potential of IR-DFWM for purposes of investigating spectral lines at elevated temperatures, which is often a challenging task with conventional absorption spectroscopy techniques. The possibility of applying IR-DFWM for combustion diagnostics of small hydrocarbons is discussed from the detection limits of the measurements and the potential water line interference. Because of the non-linear nature of the DFWM technique, it provides much higher contrast for strong lines of small molecules over backgrounds of high-density weak lines, which commonly exist in hot gas flows of thermochemical reactions.

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The pyrolysis of propane

Cassady

Choudhary

Boddapati

et al. 2020

Int J of Chemical Kinetics

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The pyrolysis of propane plays an important role in determining the combustion properties of natural gas mixtures and offers insight into the cracking patterns of larger fuels. This work investigates propane pyrolysis behind reflected shock waves with a multiwavelength laser-absorption speciation technique. Nine laser wavelengths, sensitive to key pyrolysis species, were used to measure absorbance time histories during the decomposition of 2% propane in argon between 1022 and 1467 K, 3.7-4.3 atm. Absorbance models were developed at each diagnostic wavelength to interrogate common initial conditions, and time histories of all major species are reported at 1250, 1290, 1330, 1370, and 1410 K. Nearly complete carbon recovery observed at lower temperatures enabled the inference of hydrogen formation from atomic conservation, while decaying carbon recovery at high temperatures suggests the formation of allene and 1-butene. The results show systematically faster pyrolysis than predicted by kinetic modeling and motivate further study into the kinetics of propane pyrolysis.

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Absorption cross-section measurements of methane, ethane, ethylene and methanol at high temperatures

Cited by 40 publications

References 25 publications

Relative high-resolution absorption cross sections of C2H6 at low temperatures

Relative high-resolution absorption cross sections of C2H6 at low temperatures

Investigation of ro‐vibrational spectra of small hydrocarbons at elevated temperatures using infrared degenerate four‐wave mixing

The pyrolysis of propane

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