Kim Jihee, Kwon Eilhann E, Lee Jung Eun, Jang Seong-Ho, Jeon Jong-Ki, Song JiHyeon, Park Young-Kwon
School of Environmental Engineering, University of Seoul, Seoul 02504, South Korea.
Department of Environment and Energy, Sejong University, Seoul 05006, South Korea.
J Hazard Mater. 2021 Feb 5;403:123934. doi: 10.1016/j.jhazmat.2020.123934. Epub 2020 Sep 12.
Five different Ru-Mn/zeolites were used to investigate their catalytic efficiencies for removing toluene (100 ppm) with ozone (1000 ppm) at room temperature. In general, most of metal oxide catalysts for removal of organic compounds need higher temperature than the ambient temperature, but Mn-based catalysts shows activity for prevalent organic pollutants even at room temperature with ozone. For the removal of toluene at room temperature without further heating, bimetallic Ru added Mn catalysts were applied in combination with different zeolite supports. The catalytic activity of the Ru-Mn catalysts strongly depended on the zeolite, of which the characteristics such as acidity and adsorption degree of toluene are dependent on the ratio of SiO/AlO. Among the five Ru-Mn catalysts used, Ru-Mn/HY (SiO/AlO ratio: 80) and Ru-Mn/ZSM-5 (SiO/AlO ratio: 80) had higher toluene and ozone removal efficiencies. The toluene removal efficiency of Ru-Mn/zeolites was proportional to the pore volume and surface area. In terms of ozone degradation, Ru-Mn/HY(80) and Ru-Mn/HZSM-5(80) had the highest removal efficiencies. Overall, the catalytic ozone oxidation of toluene using Ru-Mn/zeolites seemed to be affected by a combination of the acidic properties of zeolites, Mn/Mn ratio, and concentration ratio of oxygen vacancies to oxygen lattices on the catalyst surface.
使用五种不同的Ru-Mn/沸石来研究它们在室温下用臭氧（1000 ppm）去除甲苯（100 ppm）的催化效率。一般来说，大多数用于去除有机化合物的金属氧化物催化剂需要高于环境温度的温度，但锰基催化剂即使在室温下与臭氧一起也对常见有机污染物具有活性。为了在室温下无需进一步加热即可去除甲苯，将添加了双金属Ru的Mn催化剂与不同的沸石载体结合使用。Ru-Mn催化剂的催化活性强烈依赖于沸石，而沸石的酸度和甲苯吸附程度等特性取决于SiO/AlO的比例。在所使用的五种Ru-Mn催化剂中，Ru-Mn/HY（SiO/AlO比例：80）和Ru-Mn/ZSM-5（SiO/AlO比例：80）具有较高的甲苯和臭氧去除效率。Ru-Mn/沸石的甲苯去除效率与孔体积和表面积成正比。就臭氧降解而言，Ru-Mn/HY(80)和Ru-Mn/HZSM-5(80)具有最高的去除效率。总体而言，使用Ru-Mn/沸石进行甲苯的催化臭氧氧化似乎受到沸石酸性性质、Mn/Mn比例以及催化剂表面氧空位与氧晶格浓度比的综合影响。
