Rapid, Online Quantification of H₂S in JP-8 Fuel Reformate Using Near-Infrared Cavity-Enhanced Laser Absorption Spectroscopy

應用LGR激光痕量氣體分析儀快速在線量化JP-8（特級航空材料）中的H₂S

Feng Dong?, Christian Junaedi?, Subir Roychoudhury?, and Manish Gupta*?

^??Los Gatos Research, 67 East Evelyn Avenue, Suite 3, Mountain View, California 94041, United States

^??Precision Combustion, Inc., 410 Sackett Point Road, North Haven, Connecticut 06473, United States

Anal. Chem., 2011, 83 (11), pp 4132–4136

DOI:?10.1021/ac200300t

Publication Date (Web): May 3, 2011

Copyright ? 2011 American Chemical Society

Abstract

One of the key challenges in reforming military fuels for use with fuel cells is their high sulfur content, which can poison the fuel cell anodes. Sulfur-tolerant fuel reformers can convert this sulfur into H₂S and then use a desulfurizing bed to remove it prior to the fuel cell. In order to optimize and verify this desulfurization process, a gas-phase sulfur analyzer is required to measure H₂S at low concentrations (<1 ppm_v) in the presence of other reforming gases (e.g., 25–30% H₂, 10–15% H₂O, 15% CO, 5% CO₂, 35–40% N₂, and trace amounts of light hydrocarbons). In this work, we utilize near-infrared cavity-enhanced optical absorption spectroscopy (off-axis ICOS) to quantify H₂S in a JP-8 fuel reformer product stream. The sensor provides rapid (2 s), highly precise (±0.1 ppm_v) measurements of H₂S in reformate gases over a wide dynamic range (0–1000 ppm_v) with a low detection limit (3σ = ±0.09 ppm_v?in 1 s) and minimal cross-interferences from other present species. It simultaneously quantifies CO₂?(±0.2%), CH₄?(±150 ppm_v), C₂H₄?(±30 ppm_v), and H₂O (±300 ppm_v) in the reformed gas for a better characterization of the fuel reforming process. Other potential applications of this technology include measurement of coal syngas and H₂S in natural gas. By including additional near-infrared, distributive feedback diode lasers, the instrument can also be extended to other reformate species, including CO and H₂.

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