A Novel Cyclic Reaction System Involving CaS and CaSO4 for Converting Sulfur Dioxide to Elemental Sulfur without Generating Secondary Pollutants. 3. Kinetics of the Hydrogen Reduction of the Calcium Sulfate Powder to Calcium Sulfide
A Novel Cyclic Reaction System Involving CaS and CaSO4 for Converting Sulfur Dioxide to Elemental Sulfur without Generating Secondary Pollutants. 3. Kinetics of the Hydrogen Reduction of the Calcium Sulfate Powder to Calcium Sulfide
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DOI：
10.1021/ie010995
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发表时间：
2002-05
影响因子：
4.2
通讯作者：
B. Kim;H. Sohn
中科院分区：
文献类型：
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作者：
B. Kim;H. Sohn
硫酸钙还原生成硫化钙不仅是本系列第1部分中描述的将二氧化硫转化为元素硫的循环过程的一部分，而且作为从石膏生产元素硫的方法也很有意义。在不存在和存在浸渍的镍催化剂的情况下，在973和1153 K之间的反应温度和1.7和86.1 kPa之间的氢分压下，使用热重分析技术研究该反应。作为镍催化的硫酸钙粉末的反应性的实例，在1123 K和86.1 kPa的氢分压下，超过95%的新鲜镍催化的硫酸钙粉末在20分钟内转化为硫化钙。此外，反应性在10个反应和再生循环后保持相对完整，这是重要的，因为固体必须可重复使用以避免产生二次污染物。Erofeev成核和生长动力学方程。
The reduction of calcium sulfate to produce calcium sulfide is not only a part of the cyclic process for converting sulfur dioxide to elemental sulfur described in part 1 of this series but also of interest as a means of producing elemental sulfur from gypsum. This reaction was investigated using a thermogravimetric analysis technique in the absence and presence of an impregnated nickel catalyst at reaction temperatures between 973 and 1153 K and hydrogen partial pressures between 1.7 and 86.1 kPa. As an example of the reactivity of the nickel-catalyzed calcium sulfate powder, more than 95% of fresh nickel-catalyzed calcium sulfate powders was converted to calcium sulfide in 20 min at 1123 K under a hydrogen partial pressure of 86.1 kPa. Furthermore, the reactivity remained relatively intact after 10 cycles of reactions and regenerations, which is important because the solids must be reusable for repeated cycles to avoid generating secondary pollutants. The Erofeev nucleation and growth kinetics equation ...