Synergistic double doping of Co and Cu constructs multiple active sites to achieve catalyzed degradation of toluene at high humidity
Synergistic double doping of Co and Cu constructs multiple active sites to achieve catalyzed degradation of toluene at high humidity
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DOI：
10.1016/j.fuel.2023.127875
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发表时间：
2023
期刊：
影响因子：
7.4
通讯作者：
Minhui Xu;Lei Wang;Yong-gang Sun;Yulong Ma;Li Zhu;Yingbo Zhu;Juanni Zhang;Song Qiao;
中科院分区：
文献类型：
--
作者：
Minhui Xu;Lei Wang;Yong-gang Sun;Yulong Ma;Li Zhu;Yingbo Zhu;Juanni Zhang;Song Qiao;
开发高耐水、高效、稳定的功能性催化剂对降低和控制挥发性有机物具有重要意义。阐明环境水体作用下VOCs降解的催化过程和机理是一个相当大的挑战。本研究设计了CoCu-CeO 2三金属氧化物催化剂，通过调节多相界面上的颗粒形态和结构特征，考察了其在水-甲苯复合体系中的催化性能。结果表明，Cu物种的引入促进了Co 3+向Co2+的电子转移过程，从而提高了催化剂的氧化还原性能。Co物种显著促进了Cu物种在纳米尺度上的迁移和转化，实现晶格原子取代。CeO 2的掺杂增强了CeO 2形成氧缺陷的能力。在环境水的存在下，Co-Cu相互作用抑制甲苯氧化成苯甲醛和苯甲酸副产物，同时增强甲苯的矿化。设计缺陷和多金属中心在O2-H2O-甲苯反应体系中起着至关重要的作用。该催化剂体系的构建为复杂多介质环境中挥发性有机污染物的高效去除提供了科学指导。
Developing high water resistance, efficient, and stable, functional catalysts under practical working conditions is significant reducing and controlling VOCs (volatile organic compounds). It is a considerable challenge to elucidate the catalytic process and mechanism of VOCs degradation under the action of environmental water. In this study, CoCu-CeO2trimetallic oxide catalysts are designed to investigate the catalytic performance in the water-toluene complex system by modulating the morphological and structural characteristics of the bimetallic at the multiphase interface. The result indicates that introducing Cu species enhances the electron transfer process from Co3+to Co2+resulting in improved redox performance. Co species significantly promote the migration and conversion of the Cu species at the nanoscale to achieve lattice atom substitution. The bimetallic substitution enhances the ability of CeO2to form oxygen defects. In the presence of ambient water, Co-Cu interactions inhibit the oxidation of toluene to benzaldehyde and benzoic acid by-products with enhanced mineralization of toluene. Design defects and multi-metal sites play a crucial role in the O2-H2O-toluene reaction system. The construction of this catalyst system provides scientific guidance in efficiently removing volatile organic pollutants in complex multi-media environments.