Catalyst transformation during NO + NH{sub 3} reaction over vanadium oxide using in situ FTIR emission spectroscopy
- Univ. of Massachusetts, Amherst, MA (United States). Dept. of Chemical Engineering
The low-frequency capabilities of infrared emission spectroscopy (IRES) were exploited to examine the reduction of vanadium pentoxide (V{sub 2}O{sub 5}) by ammonia and hydrogen, and the reoxidation of reduced vanadia by oxygen. The catalytic reduction of NO with NH{sub 3} over V{sub 2}O{sub 5} powder in the absence of O{sub 2} was also investigated with IRES. The reduction of V{sub 2}O{sub 5} was found to occur stepwise (V{sup 5+} {yields} V{sup 4+} {yields} V{sup 3+}), with the rate being controlled by the diffusion of oxygen through the crystal lattice. Vanadia reduction occurred even in high NO/NH{sub 3} atmospheres, although the presence of NO did effect the rate of reduction.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-87ER13772
- OSTI ID:
- 659074
- Journal Information:
- Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 1 Vol. 178; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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