Vanadium pentoxide series of sulfuric acid catalysts can be used in the process of sulfuric acid production, to be more specific, is the process of SO2+I/2O2---SO3. With the help of Vanadium Catalyst, the rate of conversion can be improved greatly. It can guarantee the air speed of operation to add 10-20% more when using type star ring catalysts or ring catalysts. Vanadium catalyst can be applied in many fields, such as, sulfur-based acid production, pyrite-based acid production, nonferrous smelting gas-based acid production, gypsum-based acid production etc. Chinese traditional types of catalyst S101 series broad temperature and S108 series low temperature, which are equivalent to the types of BASF O4-110/O4-111, TOPSOE VK38/VK48 and MECS LP-120/LP-110 with shapes cylinder, ring, star ring and Triangular prism. Type S101 Catalyst is a medium broad temperature vanadium pentoxide catalyst to promote the oxidation of SO2 and O2 to give SO3, which is developed independently in China. This catalyst has a manufacturing history of over 40 years with high standard quality and steady performance. Advantages: This catalyst has advantages of wide applicability, broad range of temperature, high conversion and high mechanical strength. Ring or Plum Blossom Ring shaped catalysts have solved some problems with cylinder shaped catalyst, which are small pellets, high pressure drop and high energy consumption, bad resistance of dust accumulation. Type S108 Series sulfuric acid catalysts are invented in early 80sâ?? by China. The advantages of them are outstanding. In general, they are low ignition temperature, high activity in low temperature, high-resistant crushed strength etc. If can be used together with medium temperature type catalyst, such as, S101, you can make more profits; for instance, high conversion, and lowering environmental pollution. 1). Type S101 series are broad temperature catalysts which suit for every bed of converter. 2). Type S108 is low temperature catalysts which suit for 1/3 top of the first bed to decrease inlet operating temperature, and 4th bed, 5th bed to improve equilibrium conversion and decrease gas emission.