Catalysis, Reactors and Control Research Group (CRC), Dept. of Chemical and Environmental Engineering. University of Oviedo, Julián Clavería s/n, Oviedo 33006, Spain.
Intocast Ibérica, Av. Conde Santa Bárbara, 12, Lugones 33420, Spain.
Waste Manag. 2023 Aug 1;168:431-439. doi: 10.1016/j.wasman.2023.06.031. Epub 2023 Jun 28.
The feasibility of using dolomite powders, by-product from the refractory industry, as a CO adsorbent and as a catalyst for the acetone liquid-phase self-condensation is demonstrated in this article. The performance of this material can be largely improved by combining physical pretreatments (hydrothermal ageing, sonication) and thermal activation at different temperatures (500-800 °C). The highest CO adsorption capacity was observed for the sample after sonication and activated at 500 °C (46 mg·g). As to the acetone condensation, the best results were obtained also with the sonicated dolomites, mainly after activation at 800 °C (17.4% of conversion after 5 h at 120 °C). The kinetic model reveals that this material optimizes the equilibrium between catalytic activity (proportional to the total basicity) and deactivation by water (specific adsorption process). These results demonstrate that the valorisation of dolomite fines is feasible, proposing attractive pretreatments for obtaining activated materials with promising results as adsorbents and basic catalysts.
本文研究了菱镁矿粉末（耐火材料工业的副产品）作为 CO 吸附剂和丙酮液相自缩合催化剂的可行性。通过物理预处理（水热老化、超声处理）和不同温度（500-800°C）的热激活，可以显著提高这种材料的性能。经超声处理并在 500°C 下活化后的样品表现出最高的 CO 吸附容量（46mg·g）。就丙酮缩合而言，最佳结果也是在经超声处理的菱镁矿上获得的，主要是在 800°C 下活化的样品（在 120°C 下 5 小时后转化率达到 17.4%）。动力学模型表明，这种材料优化了催化活性（与总碱度成正比）和水失活之间的平衡（特定吸附过程）。这些结果表明，菱镁矿细粉的增值是可行的，提出了有吸引力的预处理方法，可获得具有吸附剂和碱性催化剂良好性能的活化材料。
