Abstract: An exhaust gas treatment device adapted to be connected into an exhaust line of an internal combustion engine comprises a porous body made of heat resistant material and having a plurality of conduits extending axially therethrough having an inlet end and an opposite outlet. The construction includes a closure member closing the inlet ends of at least some of the conduits. An additional closing member closes the outlet ends of at least some of the other of the conduits. A catalyst mesh material is positioned in at least some of the conduits which have open inlet ends. Exhaust gases flow into the inlet ends which are open. In some if not all of the cases, the opposite ends of the open inlet ends that is the outlet ends are closed so that the gases must flow through the porous walls of the porous body and move into contact with the catalyst mesh material of the others of the conduits and flow out the ends of those conduits which are open.

Abstract: A filtering and post-combustion device for waste gases, particularly of internal combustion engines, is designed with a plurality of filtering elements which are mounted at equally spaced radial locations within a circular or oval housing and are radially transversable by the gas stream which enters and leaves axially through funnels. At the inner filtering elements, the outlet chambers are separated from the adjacent inlet chambers of the respective following filtering element by axially extending walls. Each individual filtering element comprises a perforated retaining shell, a filter body, such as a wire mesh, permeable to gas, and a perforated supporting wall.