CO_2 imaging with saturated planar laser-induced vibrational fluorescence

Kirby, Brian J.; Hanson, Ronald K.

doi:10.1364/ao.40.006136

Cited by 20 publications

(3 citation statements)

References 25 publications

(32 reference statements)

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“…This effort was followed up by the same group and complemented with CO 2 . [24][25][26] The number of detected species was then extended to smaller hydrocarbons by Li et al 27 For point measurements, polarization spectroscopy of CO 2 was demonstrated by Roy et al 28 and followed up by Alwahabi et al 29 who also compared LIF and polarization spectroscopy in a later work. 30 Taking advantage of the coherent nature of polarization spectroscopy, measurements of nascent CO 2 and H 2 O in a flame was published by Li et al 31 , but two-dimensional measurements in background-challenging environments were still lacking.…”

Section: Introductionmentioning

confidence: 99%

An in situ set up for the detection of CO2 from catalytic CO oxidation by using planar laser-induced fluorescence

Zetterberg

Blomberg

Gustafson

et al. 2012

Review of Scientific Instruments

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We report the first experiment carried out on an in situ setup, which allows for detection of CO(2) from catalytic CO oxidation close to a model catalyst under realistic reaction conditions by the means of planar laser-induced fluorescence (PLIF) in the mid-infrared spectral range. The onset of the catalytic reaction as a function of temperature was followed by PLIF in a steady state flow reactor. After taking into account the self-absorption of CO(2), a good agreement between the detected CO(2) fluorescence signal and the CO(2) mass spectrometry signal was shown. The observed difference to previously measured onset temperatures for the catalytic ignition is discussed and the potential impact of IR-PLIF as a detection technique in catalysis is outlined.

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Section: Introductionmentioning

confidence: 99%

An in situ set up for the detection of CO2 from catalytic CO oxidation by using planar laser-induced fluorescence

Zetterberg

Blomberg

Gustafson

et al. 2012

Review of Scientific Instruments

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“…Pulsed laser-induced fluorescence (LIF) diagnostics using vibrational excitation of CO and CO 2 in the infrared have been demonstrated previously for spatially resolved gasdynamic measurements [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Diode laser-induced infrared fluorescence of water vapour

Hanson

Jeffries

2004

Meas. Sci. Technol.

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Infrared laser-induced fluorescence (LIF) of water vapour was investigated for its potential as a spatially resolved gasdynamic diagnostic. A cw diode laser operating near 1392 nm was scanned across a single absorption transition in the ν1 + ν3 band of H2O in a static cell, and the resulting fluorescence signal was collected near 2.7 µm (both ν1 and ν3 bands). Experiments were conducted at low pressure in pure water vapour and mixtures of water vapour and N2 using a 20 mW laser in a double-pass arrangement. A simple analytical model was developed to relate LIF intensity to gas properties as a function of laser power. The spectrally resolved, single-line excitation spectrum was fitted with a Voigt profile, allowing inference of the water vapour temperature from the Doppler-broadened component of the measured fluorescence lineshape. A two-line excitation scheme was also investigated as a means of measuring temperature with reduced measurement time. From these initial measurements, we estimate that a practical sensor for atmospheric pressure applications would require a minimum of 1–2 W of laser power for two-line, fixed-wavelength temperature measurements and a minimum of about 70 W of power for scanned-wavelength measurements.

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“…Excitation at 2.7 µm is chosen as an optimized scheme for the current setup, because it provides relatively strong absorption cross section, while the laser absorption by the air along the beam path is not so severe. Other excitation schemes for CO 2 PLIF detection can be found in [29][30][31][32][33]. As a proof of concept, quantitative measurements of both CO and CO 2 over a Pd catalyst during catalytic CO oxidation have been carried out to demonstrate the high spatial and temporal resolution of the two techniques for studies of gas phase in catalysis.…”

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confidence: 99%

A convenient setup for laser-induced fluorescence imaging of both CO and CO2 during catalytic CO oxidation

et al. 2017

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[2]. The reaction process is well known under ultra-high vacuum (UHV) conditions where gas flows and gas distribution around a sample are often neglected. However, the number of molecules interacting with the catalyst surface increases significantly at elevated pressures, and as a result, a change in the gas composition close to the surface may lead to a change of the surface structure [3,4]. Therefore, it is essential to obtain in-situ knowledge of the gas composition close to an operating catalyst to achieve a better understanding of the gas-surface interaction.Conventional gas analytical tools such as mass spectrometry (MS), gas chromatography (GC), and Fourier transform infrared spectrometry (FTIR) are often used to analyze gases from the outlet of a reactor. These techniques have the benefit of measuring several species simultaneously, but they suffer from a time delay or poor temporal resolution, and are not capable to spatially resolve the gas composition around a sample. Although capillary sampling techniques can provide spatially resolved concentration profiles inside reactors [5], it cannot deliver two-dimensional measurements to follow dynamic changes in the gas phase on a sub-second scale, and the intrusive nature of the probe may introduce errors in data interpretation.As an in-situ and non-invasive gas detection technique with high spatial and temporal resolution, planar laser-induced fluorescence (PLIF) has been widely used in the combustion community for flame studies [6][7][8], but much less applied in the catalyst community [9]. In earlier studies during the 1990s, LIF has been used to study the OH formation close to a Pt catalyst during the H 2 oxidation [10][11][12][13][14], the distribution of OH desorbed from a Pt catalyst during catalytic water formation reaction [15], and the formaldehyde distribution above a platinum plate during catalytic combustion of methanol/air mixtures [16]. However, in the 2000s, there were Abstract In-situ knowledge of the gas composition close to a catalyst is essential for a better understanding of the gas-surface interaction. With planar laser-induced fluorescence (PLIF), the gas distribution around an operating catalyst can be visualized with high spatial and temporal resolution, in a non-intrusive manner. We report on a convenient setup using a nanosecond YAG-Dye laser system together with a broadband mid-infrared optical parametric oscillator (OPO) for imaging both CO and CO 2 over a Pd(100) catalyst during catalytic CO oxidation, compare it to previously used systems, and show examples of its capabilities.

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CO_2 imaging with saturated planar laser-induced vibrational fluorescence

Cited by 20 publications

References 25 publications

An in situ set up for the detection of CO2 from catalytic CO oxidation by using planar laser-induced fluorescence

An in situ set up for the detection of CO2 from catalytic CO oxidation by using planar laser-induced fluorescence

Diode laser-induced infrared fluorescence of water vapour

A convenient setup for laser-induced fluorescence imaging of both CO and CO2 during catalytic CO oxidation

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