Abstract: A catalyst support comprises a stack of metal strips, said strips being coated with a catalyst material. Indentations in the strips maintain uniform spacing between the strips, so that gas can flow between the strips. The indentations are spaced so that the indentations in adjacent strips cannot coincide and nest together, so that adjacent strips cannot collapse together.
Abstract: The catalyst support is a spiral formed by winding a single strip of metal upon itself. Indentations in the strip maintain a uniform spacing between the layers in the spiral. Heretofore this uniform spacing has been obtained only by winding a double layer of two strips, one flat and one corrugated.