Abstract: The invention relates to an annular catalytic converter, having a first, tubular flow path, having a diverting region (4) and having a second, annular flow path, wherein the tubular flow path is formed by an inner pipe (1), wherein the annular flow path is formed between the inner pipe (1) and an outer pipe (2) surrounding the inner pipe, and the diverting region (4) is of pot-shaped form for the purposes of diverting the exhaust-gas flow from the tubular flow path into the annular flow path, wherein the inner pipe (1) and/or the outer pipe (2) has a conical cross section (D1, D2, D1, D4) that widens or narrows along the flow direction of the exhaust gas.

Abstract: A catalytic converter for the aftertreatment of exhaust gases from an internal combustion engine, with a first tubular central flow section, with a deflecting device for deflecting the flow direction and with an annular flow section which has at least one catalytically active matrix. The tubular flow section is formed by an inner jacket and the annular flow section is formed by an outer jacket surrounding the inner jacket, wherein the deflecting device is formed by a flat half-shell.