A method of regenerating an oxidation device (3) of an internal combustion engine (1), in particular a stationary internal combustion engine, wherein the oxidation device (3) is connected downstream of the internal combustion engine (1) and wherein a mixture of combustion gas and exhaust gas can be fed to the oxidation device (3) to increase a temperature in the oxidation device (3) and wherein exhaust gas can be passed around the oxidation device (3) by way of a bypass conduit (4), wherein the amount of exhaust gas passed around the oxidation device (3) by way of the bypass conduit (4) is controlled in open-loop or closed-loop control mode in dependence on an ascertained exhaust gas temperature downstream of the oxidation device (3).

A method for detecting the aging of a heterogeneous catalytic converter, including the following steps: acquiring at least one measurement signal in a media flow passing through the catalytic converter downstream of the catalytic converter; applying a time-variant input signal to the media flow and/or the catalytic converter; evaluating a behavior of the at least one measurement signal as a function of the time-variant input signal; and detecting a state of aging of the catalytic converter.