Power plants – Internal combustion engine with treatment or handling of... – Methods
Reexamination Certificate
2005-09-13
2005-09-13
Denion, Thomas (Department: 3748)
Power plants
Internal combustion engine with treatment or handling of...
Methods
C060S297000, C060S303000, C060S311000, C423S238000, C423S239100, C423S242200, C423S244010
Reexamination Certificate
active
06941742
ABSTRACT:
To reduce the number of particles in an exhaust gas (A), in particular in the exhaust gas (A) from an internal-combustion engine, sulfur dioxide SO2which is contained in the exhaust gas (A) is at least partially catalytically oxidized, in the presence of ammonia NH3in a catalytic converter system having a catalytic activity which increases in the direction of flow, to form sulfur trioxide SO3. The simultaneous presence of sulfur trioxide SO3and ammonia NH3in the exhaust-gas stream which is brought about in this way results in an agglomeration of the small and very small particles and reduction in the number thereof.
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Published International Application No. WO 96/36797 (Hofman et al.), dated Nov. 21, 1996, as mentioned on p. 2 of the specification.
Published International Application No. WO 92/17268 (Deeba et al.), dated Oct. 15, 1992.
“SO3NH3, Wahlco Dual FGC System”, Wahlco Environmental Systems Inc., 11/90 edition, pp. 1-4, as mentioned on p. 3 of the specification.
Fischer Stefan
Neufert Ronald
Pajonk Günther
Witzel Frank
Denion Thomas
Greenberg Laurence A.
Locher Ralph E.
Siemens Aktiengesellschaft
Stemer Werner H.
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