Coadsorption of nitriles and CO on Cu-ZSM-5: An in situ FTIR spectroscopic study
The catalytic opportunity that Cu-ZSM-5 has for potentially reducing NO{sub x} emission through reduction by hydrocarbons has prompted an enormous international examination of this material and the chemical properties it displays. The coadsorption of acetonitrile (ACN) or deuterated acetonitrile (dACN) with CO at Cu-ZSM-5 reveals several interesting features concerning the partial valency of Cu. Specifically, CO binds at Cu{sup +1} and Cu{degree} centers (in the absence of preadsorbed ACN) and exhibits C-O stretching frequencies of 2,157 cm{sup {minus}1} and 2,112 cm{sup {minus}1}, respectively. Carbon monoxide readily adsorbs at an ACN (or dACN) saturated Cu-ZSM-5 and exhibits a C-O stretch of 2,122 cm{sup {minus}1}, a value more consistent with a partially reduced Cu{sup +1} center. Furthermore, the IR cross section for the CN stretch in a number of nitriles (ACN, dACN, and benzonitrile) coadsorbed with CO displays interesting effects attributed to rehybridization and changes in CN dipole moment.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 225967
- Report Number(s):
- LA-UR-96-1239; CONF-960401-13; ON: DE96009005; TRN: AHC29610%%9
- Resource Relation:
- Conference: Spring meeting of the Materials Research Society (MRS), San Francisco, CA (United States), 8-12 Apr 1996; Other Information: PBD: [1996]
- Country of Publication:
- United States
- Language:
- English
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