Direct catalytic decomposition of nitric oxide

Technical Report · Wed Jan 01 04:00:00 EST 1992

DOI:https://doi.org/10.2172/6930554· OSTI ID:6930554

Flytzani-Stephanopoulos, M; Sarofim, A F; Zhang, Y

This project investigates a suitable catalyst system for the direct NO decomposition in post-combustion gas streams. The 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 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. 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. Effects 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 and a single-particle electrodynamic balance (EDB). 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: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-91PC91293
• OSTI ID: 6930554
• Report Number(s): DOE/PC/91293-5; ON: DE93011623
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
200202* -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
CATALYST SUPPORTS
CATALYSTS
CATALYTIC CONVERTERS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COPPER
DECOMPOSITION
DESORPTION
DOCUMENT TYPES
ELEMENTS
EQUIPMENT
FLUE GAS
GASEOUS WASTES
GRAVIMETRIC ANALYSIS
INORGANIC ION EXCHANGERS
ION EXCHANGE
ION EXCHANGE MATERIALS
MATERIALS
METALS
MINERALS
NICKEL
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM METALS
POLLUTION CONTROL EQUIPMENT
PROGRESS REPORT
QUANTITATIVE CHEMICAL ANALYSIS
REDUCTION
SILICATE MINERALS
SILVER
SORPTION
SYNTHESIS
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
TRANSITION ELEMENTS
WASTES
ZEOLITES