2013HG/T 2086-2013 The catalyst oxidizing sulphuric dioxide into sulphuric acid
2004HG 2086-2004 Catalyst for Sulfur Dioxide Oxidation to Sulfuric Acid
1970HG 2087-1991 S101-2H type vanadium catalyst for sulfuric acid production
HG 2087-1991 S101-2H type vanadium catalyst for sulfuric acid production was changed to HG 2086-2004 Catalyst for Sulfur Dioxide Oxidation to Sulfuric Acid.