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Weststrate CJ, Bakker JW, Rienks ED, et al. NH3 adsorption and decomposition on Ir(110): a combined temperature programmed desorption and high resolution fast x-ray photoelectron spectroscopy study. J Chem Phys. 2005;122(18):184705doi: 10.1063/1.1893690.
Weststrate, C. J., Bakker, J. W., Rienks, E. D., Lizzit, S., Petaccia, L., Baraldi, A., Vinod, C. P., & Nieuwenhuys, B. E. (2005). NH3 adsorption and decomposition on Ir(110): a combined temperature programmed desorption and high resolution fast x-ray photoelectron spectroscopy study. The Journal of chemical physics, 122(18), 184705. https://doi.org/10.1063/1.1893690
Weststrate, C J, et al. "NH3 adsorption and decomposition on Ir(110): a combined temperature programmed desorption and high resolution fast x-ray photoelectron spectroscopy study." The Journal of chemical physics vol. 122,18 (2005): 184705. doi: https://doi.org/10.1063/1.1893690
Weststrate CJ, Bakker JW, Rienks ED, Lizzit S, Petaccia L, Baraldi A, Vinod CP, Nieuwenhuys BE. NH3 adsorption and decomposition on Ir(110): a combined temperature programmed desorption and high resolution fast x-ray photoelectron spectroscopy study. J Chem Phys. 2005 May 08;122(18):184705. doi: 10.1063/1.1893690. PMID: 15918745.
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J Chem Phys. 2005 May 08;122(18):184705. doi: 10.1063/1.1893690.

NH3 adsorption and decomposition on Ir(110): a combined temperature programmed desorption and high resolution fast x-ray photoelectron spectroscopy study.

The Journal of chemical physics

C J Weststrate, J W Bakker, E D L Rienks, S Lizzit, L Petaccia, A Baraldi, C P Vinod, B E Nieuwenhuys

Affiliations

  1. Leids Instituut voor Chemisch Onderzoek, Universiteit Leiden, P.O. Box 9502, Einsteinweg 55, 2333 CC Leiden, The Netherlands.

PMID: 15918745 DOI: 10.1063/1.1893690

Abstract

The adsorption and decomposition of NH3 on Ir(110) has been studied in the temperature range from 80 K to 700 K. By using high-energy resolution x-ray photoelectron spectroscopy it is possible to distinguish chemically different surface species. At low temperature a NH3 multilayer, which desorbs at approximately 110 K, was observed. The second layer of NH3 molecules desorbs around 140 K, in a separate desorption peak. Chemisorbed NH3 desorbs in steps from the surface and several desorption peaks are observed between 200 and 400 K. A part of the NH3ad decomposes into NH(ad) between 225 and 300 K. NH(ad) decomposes into N(ad) between 400 K and 500 K and the hydrogen released in this process immediately desorbs. N2 desorption takes place between 500 and 700 K via N(ad) combination. The steady state decomposition reaction of NH3 starts at 500 K. The maximum reaction rate is observed between 540 K and 610 K. A model is presented to explain the occurrence of a maximum in the reaction rate. Hydrogenation of N(ad) below 400 K results in NH(ad). No NH2ad or NH3ad/NH3 were observed. The hydrogenation of NH(ad) only takes place above 400 K. On the basis of the experimental findings an energy scheme is presented to account for the observations.

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