Tseng Hui-Hsin, Wey Ming-Yen, Lin Chiou-Liang, Chang Yu-Chen
Department of Environmental Engineering, National Chung-Hsing University, Taiwan, Republic of China.
J Air Waste Manag Assoc. 2002 Nov;52(11):1281-7. doi: 10.1080/10473289.2002.10470859.
The reaction between three different Ca-based sorbents and SO2 were studied in a medium temperature range (473-773 K). The largest SO2 capture was found with Ca(OH)2 at 773 K, 126.31 mg SO2 x g Ca(OH)2(-1), and the influence of SO2 concentration on the sorbent utilization was observed. Investigations of the internal porous structure of Ca-based sorbents showed that the initial reaction rate was controlled by the surface area, and once the sulfated products were produced, pore structure dominated. To increase the surface area of Ca-based sorbents available to interact with and retain SO2, one kind of CaO/ activated carbon (AC) sorbent/catalyst was prepared to study the effect of AC on the dispersion of Ca-based materials. The results indicated that the Ca-based material dispersed on high-surface-area AC had more capacities for SO2 than unsupported Ca-based sorbents. The initial reaction rates of the reaction between SO2 and Ca-based sorbents and the prepared CaO/AC sorbents/catalysts were measured. Results showed that the reaction rate apparently increased with the presence of AC. It was concluded that CaO/AC was the active material in the desulfurization reaction. AC acting as the support can play a role to supply O2 to increase the affinity to SO2. Moreover, when AC is acting as a support, the surface oxygen functional group formed on the surface of AC can serve as a new site for SO2 adsorption.
研究了三种不同钙基吸附剂与SO₂在中温范围（473 - 773 K）内的反应。发现Ca(OH)₂在773 K时对SO₂的捕获量最大，为126.31 mg SO₂·g Ca(OH)₂⁻¹，并观察到SO₂浓度对吸附剂利用率的影响。对钙基吸附剂内部多孔结构的研究表明，初始反应速率受表面积控制，一旦生成硫酸化产物，孔结构起主导作用。为增加钙基吸附剂与SO₂相互作用并保留SO₂的可用表面积，制备了一种CaO/活性炭（AC）吸附剂/催化剂，以研究AC对钙基材料分散性的影响。结果表明，分散在高比表面积AC上的钙基材料比无载体的钙基吸附剂对SO₂具有更大的吸附容量。测量了SO₂与钙基吸附剂以及制备的CaO/AC吸附剂/催化剂之间反应的初始反应速率。结果表明，AC的存在使反应速率明显提高。得出结论，CaO/AC是脱硫反应中的活性材料。AC作为载体可起到提供O₂以增加对SO₂亲和力的作用。此外，当AC作为载体时，在AC表面形成的表面氧官能团可作为SO₂吸附的新位点。
