Abstract:Cs-Rb-V series low temperature sulphuric acid catalyst was prepared for the first time by using carbonized mother liquor containing alkali-metal salts. The results show that the conversion of SO₂ on catalyst prepared directly with carbonized mother liquor could reach to 24.8％ at 410 ℃. If n (Na)/ n (V) was adjusted properly, the conversion of SO₂ could be increased to 35.6％ at  410 ℃. Refined carbonized mother liquor could make the catalytic activity even higher at low temperature, the conversion of SO₂ could be increased to 36.65% at 410 ℃. The catalyst was examined with differential thermal analysis. It was found that both endothermic peaks and exothermic peaks of catalyst shifted forward obviously and the catalyst possessed higher activity at low temperature.

Key words: sulphuric acid catalyst; sulphur dioxide; alkali-metal element; low temperature activity; promoter