A device for additive-free, catalytically induced oxidation of solid carbon particles and decomposition of chemical compounds, comprising a converter chamber with compartments, in which porous structure catalyst carrier matrix profiles are mounted, so that a space between the internal diameter of catalyst profiles is connected to an inlet connection of the converter chamber, and a space around the external diameter of the catalyst profiles is connected to an outlet connection into the catalyst chamber. The profiles are mounted so that gas particles reach outlets only by passing through porous profiles. Advantageously, a third opening through which liquid, gaseous media, e.g., NO.sub.2, O.sub.3 or H.sub.2O or auxiliary means maybe in front of the porous structures. The porous structures are made of catalytically active material with catalytic action at temperatures below 400.degree. C., preferably below 350.degree. C. and especially below 300.degree. C. The low-temperature below 250.degree. C. by H.sub.2O is preferred.