Abstract
NO and NO 2 adsorption on a polycrystalline platinum surface was studied using temperature programmed desorption (TPD). NO adsorption is irreversible for NO exposures of less than 0.12 L at 120 K yielding only N 2 and O 2 upon heating. However, when the NO exposure is increased to 0.12 L and above, reversible NO adsorption is observed. Two NO desorption states occur with peaks at 470 and 300 K. No desorption of NO 2 resulting from oxidation of NO was observed at any coverage. NO 2 adsorption at 120 K is largely irreversible below monolayer saturation coverages. However, a small NO 2 desorption peak is observed at 300 K at a monolayer coverage of NO 2. NO and O 2 TPD spectra following NO 2 exposures are quite different from those spectra obtained following NO or O 2 exposures. The differences in the NO TPD spectra are due to the influence of coadsorbed O atoms on the adsorption and decomposition of both NO and NO 2. Changes in the O 2 TPD spectra are due to the very high coverages of adsorbed O atoms that can be obtained from NO 2 exposures.
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