Sulfur dioxide (SO₂) in combustion exhaust gas from medium-scale facilities must be removed because it pollutes the air. In this study, dry-DeSO_x filters, particularly calcium carbonate, that used simple desulfurization materials to capture SO₂ is focused on. Physically modified calcium compound, which is the main ingredient of marine waste such as scallop shell, was synthesized using the amorphous citric acid complex method to improve low-temperature desulfurization. The effects of reaction conditions such as calcination temperature and concentration of citric acid were investigated to obtain materials with high specific surface areas and desirable pore-diameter distribution. Calcium carbonate, with a specific surface area of 166 m²/g and pore diameter of 8 Å, was obtained under a 4:1 molar ratio of organic acid molecules to Ca²⁺ ions and 823 K calcination temperature. The desulfurization of the modified calcium carbonate was evaluated by thermogravimetric analysis for particle performance with calcium carbonate wash-coated onto a monolith to represent real-use conditions. All these results indicated that the desulfurization performance of the modified calcium carbonate was superior to that of commercially available calcium carbonate.

来自中等规模设施的燃烧废气中的二氧化硫（SO ₂）必须除去，因为它污染了空气。在这项研究中，重点是使用简单的脱硫材料捕获SO _2的干式DeSO _x过滤器，尤其是碳酸钙。物理改性的钙化合物是扇贝壳等海洋废弃物的主要成分，是使用无定形柠檬酸络合物方法合成的，以改善低温脱硫效果。研究了反应条件如煅烧温度和柠檬酸浓度的影响，以获得具有高比表面积和理想的孔径分布的材料。碳酸钙，比表面积为166 m ²在有机酸分子与Ca ²⁺离子的摩尔比为4：1且煅烧温度为823 K时，获得的碳原子数/ g和孔径8Å。通过热重分析评估改性碳酸钙的脱硫性能，用碳酸钙洗涂在整料上代表实际使用条件。所有这些结果表明，改性碳酸钙的脱硫性能优于市售碳酸钙的脱硫性能。