| US 7,569,197 B2 | ||
| Process for purification of sulphur-containing exhaust gas | ||
| Keld Johansen, Frederikssund (Denmark) | ||
| Assigned to Haldor Topsoe A/S, Lyngby (Denmark) | ||
| Filed on Mar. 01, 2007, as Appl. No. 11/712,371. | ||
| Claims priority of application No. 2006 00338 (DK), filed on Mar. 09, 2006. | ||
| Prior Publication US 2007/0209350 A1, Sep. 13, 2007 | ||
| Int. Cl. B01D 53/62 (2006.01); B01D 53/72 (2006.01); B01D 53/94 (2006.01); F01N 3/10 (2006.01) | ||
| U.S. Cl. 423—213.2 [423/213.5; 423/213.7; 423/245.3; 423/215.5; 423/247; 60/274; 60/282; 60/285; 60/289; 60/299; 60/302] | 12 Claims |
| 1. A process for purification of an exhaust gas stream from a combustion engine containing hydrocarbons, soot, carbon monoxide,
nitrogen oxides and sulphur dioxide, comprising the steps of
(a) oxidising the hydrocarbons and part of the soot in a first reactor in the presence of a first catalyst active in oxidising
hydrocarbons and soot without oxidising sulphur dioxide and forming a partly purified exhaust gas stream;
(b) cooling of the partly purified exhaust gas stream;
(c) oxidising the carbon monoxide of the partly purified exhaust gas stream in a second reactor in presence of a second catalyst
active in oxidising carbon monoxide without oxidising sulphur dioxide; and
(d) withdrawing a purified exhaust gas stream.
|