2013HG/T 2086-2013 The catalyst oxidizing sulphuric dioxide into sulphuric acid
2004HG 2086-2004 Catalyst for Sulfur Dioxide Oxidation to Sulfuric Acid
1970HG 2088-1991 S107, S108 vanadium catalysts for sulfuric acid production
HG 2088-1991 S107, S108 vanadium catalysts for sulfuric acid production was changed to HG 2086-2004 Catalyst for Sulfur Dioxide Oxidation to Sulfuric Acid.