Direct catalytic decomposition of nitric oxide. Quarterly technical progress report number 12, July--September, 1994
- Tufts Univ., Medford, MA (United States). Dept. of Chemical Engineering
- Massachusetts Inst. of Technology, Cambridge, MA (United States). Dept. of Chemical Engineering
This project investigates a suitable catalyst system for the direct NO decomposition in post-combustion NO{sub x} control. The process does not use a reductant, such as ammonia used in the case of Selective Catalytic Reduction (SCR) of NO{sub x} to nitrogen. Therefore, it is a greatly simplified process basically involving passing the flue gas through a catalytic converter. Catalysts are prepared by incorporating metal cations into zeolite supports according to ion exchange procedures widely used in preparation of metal/zeolite catalysts. Particular emphasis is given in this work on promoted Cu-exchanged zeolites, especially the catalysts Mg/Cu-ZSM-5 and Ce/Cu-ZSM-5, which are promising for NO conversion to nitrogen at typical flue gas O{sub 2} and NO levels and over the temperature range of 723--873 K. Effects of zeolite modification, copper exchange level and catalyst preparation conditions on the catalyst activity are studied in a packed-bed microreactor. Kinetic and selectivity studies are conducted over a wide range of P{sub NO}/P{sub O{sub 2}} and temperature with promoted and unpromoted Cu-ZSM-5. Structural characterization of the catalyst employs STEM/EDX analysis, XRD, XPS, EPR and luminescence analyses. A combination of techniques, including {sup 27}Al NMR was used to identify the stabilization role of Ce{sup 3+} in Cu-ZSM-5 under wet NO decomposition conditions. This quarterly report is in the form of a manuscript to be submitted for publication, entitled ``Positive effect of cocations in Cu-ZSM-5 on the activity of nitric oxide decomposition in the presence of water.``
- 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:
- 10107639
- Report Number(s):
- DOE/PC/91293-12; ON: DE95005202; BR: AA1525050; TRN: AHC29505%%36
- Resource Relation:
- Other Information: PBD: [1994]
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
NITRIC OXIDE
SELECTIVE CATALYTIC REDUCTION
FLUE GAS
DENITRIFICATION
COPPER
CATALYTIC EFFECTS
CERIUM
ZEOLITES
CATALYSTS
MATERIALS TESTING
PROGRESS REPORT
CHEMICAL PREPARATION
STRUCTURAL CHEMICAL ANALYSIS
IMPREGNATION
ION EXCHANGE
EXPERIMENTAL DATA
540120
010800
CHEMICALS MONITORING AND TRANSPORT
WASTE MANAGEMENT