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

应用LGR激光痕量气体分析仪快速在线量化JP-8（特级航空材料）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

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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.

阅读原文：http://www.ncbi.nlm.nih.gov/pubmed/21486070