MSQ, ie. a combination of manganese sulfate-salicylic acid-hydroquinone, is a low-cost, high-efficiency desulfurizing catalyst with low environmental impact and good compatibility.

        1. High regeneration efficiency, as can be improved by 15-20%.
        2. Good desulfurizing effect. For semi-water gas with high sulfur content (below 10g/m³), the H₂S can be reduced down to below 0.1g/m³.
        3. Reduces occurrence of side reactions from about 25% to 5-12%,
        4. Cuts ammonia consumption by roughly 30%.
        5. The sulfur formed is of large particle size, facilitating separation.
        6. Cuts cost on catalyst by at least 50%.

        1. Dissolve the MSQ catalyst in diluted ammonia to produce a solution with the following concentration: hydroquinone 0.03-0.08g/L, Manganese sulfate 0.02-0.05g/L, salicylic acid 0.1-0.2g/L, ammonia 8-20 titre.

        2. MSQ catalyst shall be added once every day or every shift.

        1. The salicylic acid in MSQ catalyst is sparingly soluble in water, dissolution is diluted ammonia is required.
        2. Once the MSQ catalyst is dissolved in diluted ammonia, do not stay for prolonged time, as hydroquinone may be oxidized under basic condition.