Uncertainty analysis of Raman spectra for measuring ortho-parahydrogen compositions

Appel, K. R.; Leachman, Jacob W.

doi:10.1088/1757-899x/1301/1/012054

Uncertainty analysis of Raman spectra for measuring ortho-parahydrogen compositions

Journal Article · Wed May 01 00:00:00 EDT 2024 · IOP Conference Series. Materials Science and Engineering

DOI:https://doi.org/10.1088/1757-899x/1301/1/012054· OSTI ID:2435633

Appel, K. R. ^[1]; ^[2]

Washington State University, Pullman, WA (United States); Washington State University
Washington State University, Pullman, WA (United States)

Determining ortho-parahydrogen compositions at cryogenic temperatures is an important quality control for liquid hydrogen custody exchange. High orthohydrogen compositions lead to an exothermic reaction resulting in increased boil off and increased venting losses of liquid hydrogen product by either the supplier or consumer. Traditional methods for measuring ortho-parahydrogen compositions such as hot-wire anemometry, nuclear magnetic resonance, and infrared spectroscopy are typically inconvenient at best. As the number of cryogenic hydrogen systems continue to increase, there is an increased need for flexible, standardized techniques for post processing composition measurements. A Raman spectrometer implemented in the Cryo-Catalysis Hydrogen Experimental Facility (CHEF) has demonstrated incredible flexibility for composition measurements of cryogenic hydrogen flows through a wide range of temperatures and pressures with the Raman probe in-situ at cryogenic temperatures. This article analyzes the uncertainty of Raman spectroscopy data of cryogenic hydrogen equilibrated at temperatures in IONEX catalyst. Spectra from hydrogen catalyzed to the equilibrium ortho-parahydrogen composition are processed and compared to expected statistical distributions for method verification.

Research Organization:: Washington State University, Pullman, WA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Hydrogen Fuel Cell Technologies Office (HFTO)

Grant/Contract Number:: EE0008429

OSTI ID:: 2435633

Journal Information:: IOP Conference Series. Materials Science and Engineering, Journal Name: IOP Conference Series. Materials Science and Engineering Journal Issue: 1 Vol. 1301; ISSN 1757-8981

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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