Production of the NH radical from the catalytic decomposition of NH3 on polycrystalline Pt and Fe surfaces at high temperatures

Gary S. Selwyn*, Ming-Chang Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Decomposition of NH3 on polycrystalline platinum at temperatures >1200 K was found to result in desorption of the NH radical into the gas phase. The gaseous NH radical was detected by means of the laser-induced fluorescence technique. The desorption process is one of several possible steps involving the surface-adsorbed NH radical. NH2 was not observed to desorb from the catalyst at all temperatures studied. The measured activation energy for NH desorption is 66 ± 3 kcal/mol and appears to be independent of NH3 or H2 gas phase concentration over the range studied. Addition of H2 to NH3 enhances the yield of NH desorbed; however, addition of D2 to NH3 enhances the desorption yield of both ND and NH. A mechanism for NH3 decomposition is proposed to account for these observations and the results of other studies. A similar but brief study of NH3 decomposition on polycrystalline Fe surfaces was also made. Similarly NH, but not NH2, was found to desorb from the Fe surface above 1000 K.

Original languageEnglish
Pages (from-to)213-220
Number of pages8
JournalChemical Physics
Volume67
Issue number2
DOIs
StatePublished - 15 May 1982

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