Oxidation of CO by NO over Rh(111)

Conference · Fri Dec 31 04:00:00 EST 1993

OSTI ID:141994

Belton, D N; Ng, S; Schmieg, S J ^[1]

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1. General Motors Research Labs., Warren, MI (United States)

The authors have studied the oxidation of CO by NO over a Rh(111) catalyst at pressures between 2 and 120 Torr paying particular attention to the nitrogen containing products. Reacting 8 Torr of Co with 8 Torr of NO between 525 K and 675 K the authors detect three products, CO{sub 2}, N{sub 2}O, and N{sub 2}. All three products are formed with an apparent activation energy (E{sub {alpha}}) near 33.5 kcal/mol. Within the range of temperatures and pressures that were examined, N{sub 2}O is the primary N containing product-Rh(111) is about 70% selective for N{sub 2}O. The selectivity for N{sub 2}O is insensitive to reaction temperature, reactant pressures, and NO conversion. By varying the reactant pressures at three different temperatures, it was determined that the CO{sub 2}, N{sub 2}O, and N{sub 2} production rates are all near zero order in both CO and information pertaining to the mechanism of the reaction. The authors have (1) measured the N{sub 2}O formation rate, (2) obtained better estimates of N atom recombination rates, and (3) obtained evidence suggesting that the step, NO + N {yields} N{sub 2}, does not occur. The results over single crystals will be compared to data for supported catalysts under similar conditions.

• OSTI ID: 141994
• Report Number(s): CONF-930304--
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
CARBON MONOXIDE
CATALYTIC EFFECTS
CHEMICAL REACTIONS
EXHAUST GASES
LOW PRESSURE
NITRIC OXIDE
OXIDATION
RHODIUM
TEMPERATURE RANGE 0400-1000 K