Decomposition of N{sub 2}O on Ni(755) and the character of the atomic oxygen deposited at step sites

Journal Article · Sat Jul 25 04:00:00 EDT 1998 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.1998.2101· OSTI ID:653318

Orita, Hideo; Kondoh, Hiroshi; Nozoye, Hisakazu ^[1]

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1. National Inst. of Materials and Chemical Research, Tsukuba, Ibaraki (Japan)

Adsorption and reaction of N{sub 2}O on a stepped Ni(755) surface have been investigated by temperature-programmed desorption (TPD). The decomposition of adsorbed N{sub 2}O occurs exclusively at the step sites on Ni(755) below 200 K during TPD ramp, yielding gaseous N{sub 2} and leaving atomic oxygen there. The amount of the atomic oxygen is controlled easily by changing the exposure of N{sub 2}O. The character of the atomic oxygen has been studied by using decomposition of cycloheptane as a probe reaction. All the atomic oxygen generated in situ from coadsorbed N{sub 2}O can react with carbon atoms produced from the decomposition of cycloheptane, resulting in desorption of CO around 600 K upon heating. However, two thirds of the predeposited atomic oxygen cannot be desorbed as CO upon heating up to 723 K. The predeposited atomic oxygen becomes inactive during the predeposition process and probably interacts with the step sites more strongly.

• OSTI ID: 653318
• Journal Information: Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 2 Vol. 177; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION CONTROL
CATALYTIC EFFECTS
DECOMPOSITION
DESORPTION
EXHAUST GASES
NICKEL
NITROUS OXIDE
OXYGEN