Patent ID: 6941742
Filing Date: 2005-09-13
Classification: B01D,F01N,Y02T

Abstract:
1. A method of reducing a number of particles in an exhaust gas formed during a combustion of a fuel, which comprises the steps of providing an exhaust gas containing sulfur dioxide and particles having a first average particle diameter, admixing ammonia with the exhaust gas, and flowing the mixture of ammonia and exhaust gas through a catalytic converter system having oxidation activity such that the catalytic activity increases, in terms of the oxidation of sulfur dioxide SO 2 , in the direction of flow, whereby sulfur dioxide is at least in part catalytically oxidized to form sulfur trioxide and ammonia and sulfur trioxide interact on a particle surface, leading to agglomeration of the particles and affording exhaust gas with diminished content of sulfur oxides and particles diminished in number and having a second average particle diameter greater than said first average particle diameter.