Lean NO{sub x} reduction over Au/Al{sub 2}O{sub 3}
- Northwestern Univ., Evanston, IL (United States)
It has been observed recently that Au/Al{sub 2}O{sub 3} are promising lean NO{sub x} reduction catalysts. In this study, lean NO{sub x} reduction activity of Au/Al{sub 2}O{sub 3} was examined with respect to the preparation variables, such as co-precipitation method versus deposition-precipitation method, pH in precipitation and metal loadings. Catalysts prepared by co-precipitation only reduced NO to N{sub 2}O, whereas those prepared by deposition-precipitation method were active for the reduction of NO to N{sub 2} in the presence of H{sub 2}O and high O{sub 2} partial pressure. Stability of Au catalysts was also examined under reaction conditions. A 0.9 wt% Au/Al{sub 2}O{sub 3} catalyst tested, showed surprisingly high stability. There was no sign of deactivation after over 26 h of use between 400 and 500{degrees}C.
- OSTI ID:
- 214810
- Report Number(s):
- CONF-950801--
- Country of Publication:
- United States
- Language:
- English
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