Direct catalytic decomposition of nitric oxide. Quarterly technical progress report No. 7, April--June 1993

Technical Report · Wed Sep 01 04:00:00 EDT 1993

DOI:https://doi.org/10.2172/10179351· OSTI ID:10179351

Flytzani-Stephanopoulos, M

This project investigates a suitable catalyst system for direct NO decomposition in post-combustion gas streams. This process does not use a reductant, such as the ammonia used in Selective Catalytic Reduction (SCR) of NO{sub x} to nitrogen. Therefore, it is 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. The catalysts of primary interest include copper, palladium, silver and nickel exchanged ZSM-5 catalysts. Particular emphasis is given in this work on promoted Cu-exchanged zeolites, especially the catalyst system Mg/Cu-ZSM-5 and a few others, 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--873K. The effect of zeolite modification, copper exchange level and catalyst preparation conditions on the catalyst activity are studied in a packed-bed microreactor. Temperature-programmed desorption (TPD) and reduction (TPR) experiments will be carried out in a thermogravimetric analyzer. Kinetic studies of NO and O{sub 2} interaction with catalysts over a wide temperature range as well as catalyst structural investigations are planned.

• 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: 10179351
• Report Number(s): DOE/PC/91293--T3; ON: DE93040709
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800
20 FOSSIL-FUELED POWER PLANTS
200202
AIR POLLUTION CONTROL
CATALYSTS
COAL
COMBUSTION
COMBUSTION PRODUCTS
COPPER
DECOMPOSITION
FLUE GAS
NICKEL
NITRIC OXIDE
NOXIOUS GAS AND PARTICULATE EMISSIONS
PALLADIUM
PERFORMANCE
PROGRESS REPORT
SILVER
TEMPERATURE DEPENDENCE
WASTE MANAGEMENT
ZEOLITES