Erhöhung der abscheidung ultrafeiner dieselrußpartikeln durch mikrokugelbeschichtung auf metallträgerbasierten katalysatorstrukturen

Measurements made at a model gas facility using the PM-Oxi-Kat system reduced diesel soot particle emissions by 35-48% without the disadvantages of the conventional commercially available soot particle filter. Using a complex aerosol conditioning and precise measuring technique the slight influences on the deposition behavior of fractal model soot particles on microsphere-coated catalysts structures was quantified. Optimal deposition rates were determined for a loading with spheres of small diameter and for higher flow velocities. In the same way a correspondingly designed ceramic wash coat can additionally increase the deposition. Further studies relate to modifications of the ceramic wash coat and detailed studies of the oxidation kinetics of actual soot. The discussion covers statement of the problem (diesel exhaust gas treatment to comply with future limits on exhaust pollution); the PM-Oxi-Kat system; experimental procedure (model exhaust gas facility and flat bed reactor; model aerosol generation and particle classification); experimental results (microsphere-coated structure; localization of the particle deposition/clarification of the deposition mechanisms); ESC test cycle application study; and conclusion.