| Title: | Insights into effects of grain boundary engineering in composite metal oxide catalysts for improving catalytic performance |
| Author(s): | Zhou B; Bai B; Zhu X; Guo J; Wang Y; Chen J; Peng Y; Si W; Ji S; Li J; |
| Address: | "State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China; State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China. State Environmental Protection Key Laboratory of Eco-Industry, Chinese Research Academy of Environmental Sciences, Beijing 100012, China. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China. School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China. State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China. State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China. Electronic address: siwenzhe521@126.com" |
| DOI: | 10.1016/j.jcis.2023.09.148 |
| ISSN/ISBN: | 1095-7103 (Electronic) 0021-9797 (Linking) |
| Abstract: | "Volatile Organic Compounds (VOCs) have long been a threat to human health. However, designing economical and efficient transition metal composite oxide catalysts for VOCs purification remains a challenge. Herein, this study demonstrates the enormous potential of grain boundary engineering in facilitating VOCs decomposition over ordered mesoporous composite oxide denoted as 3D-Mn(x)Co(y) (x, y = 1, 3, 5, 7, 9). Specifically, the three-dimensional (3D) Mn7Co1 catalyst shows 100% ethyl acetate removal efficiency for a continuous airflow containing 1000 ppm ethyl acetate over 60000 h(-1) space velocity at 160 degrees C. Mechanism study suggests that the high catalytic performance originates from the lattice distortion caused by the introduction of heteroatoms, along with the size effect of nanopore walls, which leads to the formation of various grain boundaries on the catalyst surface. The presence of grain boundaries facilitates the generation of oxygen vacancies, thus promoting the migration and activation of oxygen species. Furthermore, the near-atmospheric pressure X-ray photoelectron spectroscopy (NAP- XPS) monitoring results reveal that the bimetallic synergy enhanced by grain boundary accelerates the catalytic reaction rate of VOCs through Mn(3+)+Co(3+)<-->Mn(4+)+Co(2+) redox cycle. This study may shed light on the great potential of ordered mesoporous bimetallic oxide catalysts in VOCs pollution control" |
| Keywords: | 3D-Mn(x)Co(y) Grain boundary engineering Nap-xps Surface defects Synergy effects VOCs emissions; |
| Notes: | "PublisherZhou, Bin Bai, Bingyang Zhu, Xiaofeng Guo, Jingjie Wang, Yu Chen, Jianjun Peng, Yue Si, Wenzhe Ji, Shengfu Li, Junhua eng 2023/10/04 J Colloid Interface Sci. 2023 Sep 26; 653(Pt B):1177-1187. doi: 10.1016/j.jcis.2023.09.148" |
