Reactivity of Fe-0 atoms and clusters with D2O over FeO(111)

Journal Article · Thu Mar 26 04:00:00 EDT 2009 · Journal of Physical Chemistry C, 113(2):4960-4969

DOI:https://doi.org/10.1021/jp810143y· OSTI ID:951035

Parkinson, Gareth S; Kim, Yu K; Dohnalek, Zdenek; Smith, R Scott; Kay, Bruce D

The interaction of Fe0 atoms with D2O layers on FeO(111) has been investigated using the “atom dropping” preparation technique and a combination of temperature programmed desorption, x-ray photoelectron spectroscopy, Auger electron spectroscopy, and infrared absorption spectroscopy. The data demonstrate that isolated Fe atoms form DFeOD insertion species upon deposition at 35 K, which then dissociate into FeOD and a surface hydroxyl above 200 K. Interestingly, even at very low Fe0 coverages the D2O is perturbed by the presence of the Fe, but only D2O desorption is observed. At higher (≥ 0.5 ML) coverages, clusters of Fe form which have molecular D2O and OD species adsorbed on the surface. Both molecular and recombinative desorption are observed in TPD. In contrast to the low coverage data, a second reaction pathway emerges at high coverage which leads to desorption of D2 and the formation of stable substoichiometric oxide. The mechanism for this minor channel is concluded to involve a reaction between two (or more) DFeOD complexes.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 951035
• Report Number(s): PNNL-SA-63282; KC0302020
• Journal Information: Journal of Physical Chemistry C, 113(2):4960-4969, Journal Name: Journal of Physical Chemistry C, 113(2):4960-4969 Journal Issue: 2 Vol. 113; ISSN 1932-7447
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ACTIVATION ENERGY
ATOMS
CHEMISORPTION
DESORPTION
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INTERACTIONS
IRON
IRON OXIDES
KINETICS