School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, Guangzhou 510006, China.
Environ Sci Technol. 2024 Apr 16;58(15):6725-6735. doi: 10.1021/acs.est.4c00710. Epub 2024 Apr 2.
It is a promising research direction to develop catalysts with high stability and ozone utilization for low-temperature ozone catalytic oxidation of VOCs. While bimetallic catalysts exhibit excellent catalytic activity compared with conventional single noble metal catalysts, limited success has been achieved in the influence of the bimetallic effect on the stability and ozone utilization of metal catalysts. Herein, it is necessary to systematically study the enhancement effect in the ozone catalytic reaction induced by the second metal. With a simple continuous impregnation method, a platinum-cerium bimetallic catalyst is prepared. Also highlighted are studies from several aspects of the contribution of the second metal (Ce) to the stability and ozone utilization of the catalysts, including the "electronic effect" and "geometric effect". The synergistic removal rate of toluene and ozone is nearly 100% at 30 °C, and it still shows positive stability after high humidity and a long reaction time. More importantly, the instructive significance, which is the in-depth knowledge of enhanced catalytic mechanism of bimetallic catalysts resulting from a second metal, is provided by this work.
开发具有高稳定性和臭氧利用率的催化剂，用于低温下 VOCs 的臭氧催化氧化，这是一个很有前景的研究方向。虽然双金属催化剂与传统的单贵金属催化剂相比表现出优异的催化活性，但在双金属效应对金属催化剂的稳定性和臭氧利用率的影响方面，取得的成果有限。因此，有必要系统地研究第二金属在臭氧催化反应中引起的增强效应。本文采用简单的连续浸渍法制备了铂铈双金属催化剂。并从第二金属（Ce）对催化剂稳定性和臭氧利用率的贡献的几个方面进行了研究，包括“电子效应”和“几何效应”。在 30°C 时，甲苯和臭氧的协同去除率接近 100%，在高湿度和长时间反应后仍表现出积极的稳定性。更重要的是，这项工作提供了双金属催化剂增强催化机制的深入知识，具有指导意义。
