LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal; ALiCE - Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal.
LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal; ALiCE - Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal; LSRE - LCM - Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal.
J Environ Manage. 2022 Nov 15;322:116084. doi: 10.1016/j.jenvman.2022.116084. Epub 2022 Sep 5.
The degradation of toluene from a gas stream by the heterogeneous Fenton process was evaluated over a carbon-coated monolith impregnated or not with iron as catalyst in a bubble column reactor (BCR). The carbon-coated monolith support (CM) was prepared by chemical vapor deposition and the catalyst (CM impregnated with iron - herein called CM-Fe) by adsorption. In the screening of processes (absorption, adsorption and reaction), it was shown that the heterogeneous Fenton process catalyzed by CM-Fe presents the best efficiency (toluene transfer (η) = 10 × 10 mol, for 300 mL of liquid solution and 0.69 g of catalyst). Finally, the stability of CM and CM-Fe was evaluated, wherein ten consecutive runs were carried out, the results showing a considerable deactivation of CM during the first five cycles. In contrast, the CM-Fe sample only slightly decreases its activity from the 1st to 2nd cycle (due to a small amount of iron leached from the monolith, 0.7%), remaining stable after that, which is important for applying this technology at the industrial level. This work showed for the first time that the treatment of gaseous effluents containing organic compounds by the Fenton process (which takes place in the liquid phase) using a carbon-coated monolith impregnated with iron is plausible, so the proof of concept was successfully accomplished.
采用鼓泡式反应器（BCR），通过非均相芬顿工艺在涂覆碳的整体式催化剂（CM）上评价甲苯从气流中的降解情况，CM 上负载有铁（CM 负载铁，简称 CM-Fe）作为催化剂。在对吸收、吸附和反应这三个工艺的筛选过程中，CM-Fe 催化的非均相芬顿工艺表现出最高的效率（300mL 液相中，0.69g 催化剂时，甲苯转化率 η=10×10）。最后，评估了 CM 和 CM-Fe 的稳定性，进行了十次连续运行，结果表明在最初的五个循环中 CM 出现了相当大的失活。相反，CM-Fe 从第一个循环到第二个循环的活性仅略有下降（由于从整体式上浸出的少量铁，0.7%），此后保持稳定，这对于在工业规模上应用这项技术非常重要。这项工作首次表明，使用涂覆碳的整体式催化剂（CM）和铁负载催化剂（CM-Fe）处理含有有机化合物的气态流出物是可行的，因此成功验证了概念的可行性。
