Department of Pharmaceutical Engineering, School of Pharmacy and Key Laboratory of Basic Pharmacology of Guizhou Province, Zunyi Medical University, Zunyi, Guizhou 563000, China.
Department of Pharmaceutical Engineering, School of Pharmacy and Key Laboratory of Basic Pharmacology of Guizhou Province, Zunyi Medical University, Zunyi, Guizhou 563000, China.
J Hazard Mater. 2021 Aug 15;416:125913. doi: 10.1016/j.jhazmat.2021.125913. Epub 2021 Apr 18.
Deep degradation of chlorophenols (CPs) into safe and ecofriendly cyclohexanol during catalytic hydrodechlorination (HDC), shows important practical significance and attractive prospect in the treatment of wastewater containing chlorophenols. An efficient Rh-La/SiO catalyst was developed, by employing La as promoter. The presence of La in catalyst promoted catalytic performance of HDC significantly. Characterization results revealed that the interaction occurred between Rh and La in Rh-La/SiO catalyst. This interaction accompanied with the high dispersion and finely particle size of active Rh, and generation of abundant Rh sites neighboring La atom. Kinetic study illustrated that Rh-La(1:1)/SiO catalyst possessed the fastest kinetic constants, and minimized the apparent activation energies of 4-CP, phenol and cyclohexanone greatly. Complete degradation of 4-CP with a very high yield of cyclohexanol (> 98%) can be achieved at room temperature, making Rh-La(1:1)/SiO catalyst to be a promising candidate for deep degradation of CPs during HDC and other Rh catalyzed hydrogenation reactions.
在催化加氢脱氯（HDC）过程中，将氯酚（CPs）深度降解为安全环保的环己醇，在处理含氯酚废水中具有重要的实际意义和诱人的前景。本文采用 La 作为促进剂，开发了一种高效的 Rh-La/SiO 催化剂。催化剂中 La 的存在显著促进了 HDC 的催化性能。表征结果表明，Rh-La/SiO 催化剂中 Rh 和 La 之间发生了相互作用。这种相互作用伴随着活性 Rh 的高分散性和细颗粒尺寸的产生，以及大量邻近 La 原子的 Rh 位的生成。动力学研究表明，Rh-La(1:1)/SiO 催化剂具有最快的动力学常数，极大地降低了 4-CP、苯酚和环己酮的表观活化能。在室温下，4-CP 可完全降解，环己醇的收率非常高（>98%），使得 Rh-La(1:1)/SiO 催化剂成为 HDC 过程中以及其他 Rh 催化加氢反应中深度降解 CPs 的有前途的候选者。
