VK48 is a high vanadium version of the standard all-round VK38 catalyst. The catalyst composition is specifically formulated for lower pass service, particularly where the process gas contains large amounts of SO₃. The conversion ratio of SO₂ affects the balance between the active vanadium species in the catalyst. An optimized ratio of the alkali-metal promoters enables an increased vanadium content in VK48, resulting in a considerably enhanced activity. In high SO₃ gas environments, such as the lower passes of single absorption plants, or the third pass of a 3:1 double absorption plant, VK48 offers a significant performance advantage.

12 mm Daisy : improved energy efficiency throughout the operating cycle due to low initial pressure drop; 6 mm cylinder and 10 mm ring: ensure an even gas distribution in applications with low gas velocity converters.