Direct catalytic decomposition of nitric oxide. Quarterly technical progress report No. 3, April 1992--June 1992
This project will investigate a suitable catalyst system for the direct NO decomposition, for post-combustion NO{sub x} control. The proposed process will not use a reductant, such as ammonia in case of Selective Catalytic Reduction (SCR) process for catalytic reduction of NO{sub x} to nitrogen. This is a simplified process basically involving passing the flue gas through a catalytic converter, thus avoiding problems generally associated with the commercial Selective Catalytic Reduction (SCR) process, namely high operating cost, ammonia slip, and potential N{sub 2}O emissions. A brief description of the proposed work is as follows: catalysts will be prepared by incorporating metal cations into zeolite supports according to ion exchange procedures widely used in preparation of metal/zeolite catalysts. Zeolites will be modified to improve catalytic activity, by blocking ion exchange sites in the small pores of zeolites with promoter cations of high valence. The catalysts of primary interest include copper (Cu), palladium (Pt), silver (Ag), and nickel (Ni) exchanged zeolites. Additional tests will be conducted for the promoter/Cu-exchanged zeolites, particularly the catalyst system Mg/Cu-ZSM-5 for NO conversion to nitrogen at typical flue gas O{sub 2} and NO levels and over the temperature range of 723-873K. Effects of zeolite modification, copper exchange level and catalyst preparation conditions on the catalyst activity will be studied in a packed-bed microreactor. Temperature-programmed desorption (TPD) and reduction (TPR) experiments will be carried out in a thermogravimetric analyzer and a single-particle electrodynamic balance (EDB). Kinetic studies of NO and O{sub 2} interactions with catalysts as well as catalyst structural investigations are planned. These would provide new ways for improving the decomposition in oxygen-containing exhaust gas stream.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge, MA (United States). Dept. of Chemical Engineering
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-91PC91293
- OSTI ID:
- 57262
- Report Number(s):
- DOE/PC/91293-T4; ON: DE95011482; TRN: 95:004206
- Resource Relation:
- Other Information: PBD: [1995]
- Country of Publication:
- United States
- Language:
- English
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