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Research at St Andrews

Production and stability of low amount fraction of formaldehyde in hydrogen gas standards

Research output: Contribution to journalArticlepeer-review

Author(s)

Thomas Bacquart, Mark Perkins, Valerio Ferracci, Nicholas A. Martin, Kate Resner, Michael K.M. Ward, Nathan Cassidy, Joshua B. Hook, Paul J. Brewer, John T. S. Irvine, Paul A. Connor, Arul Murugan

School/Research organisations

Abstract

Formaldehyde is an intermediate of the steam methane reforming process for hydrogen production. According to International Standard ISO 14687-2 the amount fraction level of formaldehyde present in hydrogen supplied to fuel cell electric vehicles (FCEV) must not exceed 10 nmol mol−1. The development of formaldehyde standards in hydrogen is crucial to validate the analytical results and ensure measurement reliability for the FCEV industry. NPL demonstrated that these standards can be gravimetrically prepared and validated at 10 μmol mol−1 with a shelf-life of 8 weeks (stability uncertainty <10%; k = 1), but that formaldehyde degrades into methanol and dimethoxymethane, as measured by FTIR, GC-MS and SIFT-MS. The degradation kinetics is more rapid than predicted by thermodynamics, this may be due to the internal gas cylinder surface acting as a catalyst. The identification of by-products (methanol and dimethoxymethane) requires further investigation to establish any potential undesirable impacts to the FCEV.
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Details

Original languageEnglish
Pages (from-to)6711-6722
JournalInternational Journal of Hydrogen Energy
Volume43
Issue number13
Early online date3 Mar 2018
DOIs
Publication statusPublished - 29 Mar 2018

    Research areas

  • Formaldehyde, Hydrogen, ISO14687, Gas analysis, Degradation products, “Gas standard”

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