On the mechanism of no decomposition and selective catalytic reduction by hydrocarbons over Cu-ZSM-5
- AlliedSignal Research and Technology, Des Plaines, IL (United States)
The initial reports on the catalytic activity of Cu-ZSM-5 during NO decomposition and selective catalytic reduction (SCR) by hydrocarbons have generated a lot of excitement and the follow- up research on this catalyst in recent years. Although the lack of hydrothermal aging stability may prohibit its practical application, Cu-ZSM-5 provides an excellent system for studying the mechanism and the structure-function relationship of the zeolite based NO{sub x} reduction catalysts. Reported here are our most recent analysis of the data obtained from the investigations of the catalytic mechanisms of NO removal over a Cu-ZSM-5 catalyst using the in situ X-ray absorption spectroscopy method. Two mechanism were studied and compared, they are (a) direct NO catalytic decomposition and (b) NOSCR by hydrocarbons in an oxygen-rich gas mixture. The difference and similarity between the two mechanisms were found through the analysis of cuprous and cupric ion transition energy shifts, the changes of local coordination structure, the influence of cuprous ion formation/catalytic activities by Cu exchange level and the type of hydrocarbon used in the catalytic reactions. The results are summarized.
- OSTI ID:
- 460143
- Report Number(s):
- CONF-950801-; ISSN 0569-3772; TRN: 97:002094-0050
- Journal Information:
- Preprints of Papers, American Chemical Society, Division of Fuel Chemistry, Vol. 40, Issue 4; Conference: 210. national meeting of the American Chemical Society (ACS), Chicago, IL (United States), 20-25 Aug 1995; Other Information: PBD: 1995
- Country of Publication:
- United States
- Language:
- English
Similar Records
On the mechanism of NO selective catalytic reduction by hydrocarbons over Cu-ZSM-5 via X-ray absorption spectroscopic study
Direct catalytic decomposition of nitric oxide. Final report