SO/sub 2/ deactivation in NO reduction by NH/sub 3/: IV. Auger studies of deactivated catalysts in selective NO reduction

Conference · Mon Aug 01 04:00:00 EDT 1977 · Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States)

OSTI ID:7060972

Tsai, J; Agrawal, P K; Sullivan, D R; Katzer, J R; Manogue, W H

The extent and cause of deactivation of supported metal catalysts by SO/sub 2/ in the selective reduction of NO by NH/sub 3/ was studied as a function of the gas-phase O/sub 2/ concentration. Al/sub 2/O/sub 3/-supported foils of Pt, Pd, Ru, and Ni were used and the surface composition and concentration-depth profile were determined for each after steady-state operation. Surface analyses gave the oxygen and sulfur peak intensities. A comparison of the metals in NO reduction systems showed that the relative catalytic activities in the NO--NH/sub 3/ system is Pt approximately Pd much greater than Ru > Ni. The order of activity in the No--NH/sub 3/ --O/sub 2/ system was Pt much greater than Pd > Ru approximately Ni. The relative activity in the NO-NH/sub 3/ --SO/sub 2/ system was Ru much greater than Pt,Pd,Ni. The relative activity for the No--NH/sub 3/ --O/sub 2/--SO/sub 2/ system was Pt much greater than Pd > Ru >Ni, and the severe deactivation caused by SO/sub 2/ was largely eliminated by the presence of O/sub 2/ along with SO/sub 2/. (JSR)

• Research Organization: Univ. of Delaware, Newark
• OSTI ID: 7060972
• Conference Information: Journal Name: Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States) Journal Volume: 22:4
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000 -- Coal
Lignite
& Peat-- Combustion
33 ADVANCED PROPULSION SYSTEMS
330700 -- Advanced Propulsion Systems-- Emission Control
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION CONTROL
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COMPARATIVE EVALUATIONS
DEACTIVATION
ELEMENTS
METALS
NICKEL
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM
PLATINUM METALS
POLLUTION CONTROL
REDUCTION
REFRACTORY METALS
RUTHENIUM
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SURFACE PROPERTIES
TRANSITION ELEMENTS