TPD and FTIR study of the adsorption of NO and O{sub 2} on Cu/ZSM-5
- Univ. of Wisconsin, Milwaukee, WI (United States)
The adsorption and thermal programmed desorption (TPD) of NO over Cu/ZSM-5 were investigated. Two major NO desorption peaks were detected at 370K and 670K. A series of shoulders also were found below 370K and between 370K and 670K. N{sub 2}, N{sub 2}O and NO{sub 2} also were recorded in all the TPD spectra, furthermore, a simultaneous evolution of O{sub 2} was observed at 670K. To understand the interaction of NO with the surface of Cu/ZSM-5, TPD studies of NO{sub 2}, N{sub 2}O and O{sub 2}, isotopic exchange of oxygen and FTIR study also were carried out. The results suggested that the O{sub 2} detected in the NO TPD profiles came from the combination of the atomic oxygen produced through the decomposition of NO. NO{sup +} and NO{sub 2}{sup -} were detected as the two major NO adsorption species on the surface. The first is responsible for the low temperature desorption of NO whereas the second is responsible for the high temperature NO desorption and the simultaneous evolution of O{sub 2} at 670K. A conclusion can be reached that NO{sub 2} exists on the surface and behaves as a rather stable intermediate.
- OSTI ID:
- 214611
- Report Number(s):
- CONF-950801--
- Country of Publication:
- United States
- Language:
- English
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