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A matrix for a catalytic reactor used for exhaust gas purification in internal combustion engines includes corrugated strips of sheet steel that are coatable with catalyst material. The sheets are folded to produce several layers in a tubular housing which is traversed by a flow of exhaust gases. Th

A matrix for a catalytic reactor used for exhaust gas purification in internal combustion engines includes corrugated strips of sheet steel that are coatable with catalyst material. The sheets are folded to produce several layers in a tubular housing which is traversed by a flow of exhaust gases. The individual layers are part of a continuous length or strip of sheet steel which is folded in a meandering or serpentine fashion. A zigzag folding pattern is especially preferred. This arrangement simplifies manufacturing and results in improved radial equalization of exhaust gases. Uniformity of flow profile is improved by cutouts provided in the matrix material.

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Matrix for a catalytic reactor for purifying exhaust gas, said matrix having a longitudinal axis and comprising a corrugated sheet of steel having surfaces coatable with a catalyst material, and two flat steel sheets, arranged respectively on either side of said corrugated sheet, said flat and corru

Matrix for a catalytic reactor for purifying exhaust gas, said matrix having a longitudinal axis and comprising a corrugated sheet of steel having surfaces coatable with a catalyst material, and two flat steel sheets, arranged respectively on either side of said corrugated sheet, said flat and corrugated sheets being arranged in a plurality of layers, wherein said layers are formed from said flat and corrugated sheets being folded in a serpentine pattern.