Effect of boric acid on thermal dehydrogenation of ammonia borane: H2 yield and process characteristics

Hyun Tae Hwang, Patrick Greenan, Seung Jin Kim, Arvind Varma

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

We have recently demonstrated that boric acid (H3BO3, BA) is a promising additive to decrease onset temperature as well as to enhance hydrogen release kinetics for thermolysis of ammonia borane (NH3BH3, AB). The observations suggest that tetrahydroxyborate ion released by heating BA serves as Lewis acid and catalyzes AB dehydrogenation. Using this approach, we obtained high H2 yield at 85°C, along with rapid kinetics. Various operating conditions were investigated, such as reactor temperature, AB wt %, and particle size of BA. Even in the presence of 10 wt % BA, high H2 yield (13 wt %) and trace amount of ammonia (10-20 ppm) were obtained at 80°C, proton exchange membrane (PEM) fuel cell operating temperature. To our knowledge, such H2 yield value is higher than from any other method using AB with additive or catalyst at PEM fuel cell operating temperatures.

Original languageEnglish
Pages (from-to)3359-3364
Number of pages6
JournalAICHE Journal
Volume59
Issue number9
DOIs
StatePublished - Sep 2013

Keywords

  • Ammonia borane
  • Boric acid
  • Dehydrogenation
  • Hydrogen
  • Hydrogen storage

ASJC Scopus subject areas

  • Biotechnology
  • Environmental Engineering
  • Chemical Engineering (all)

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