纳米棒
催化作用
煅烧
材料科学
氧化还原
X射线光电子能谱
化学工程
铜
复合数
氧气
合金
多孔性
复合材料
化学
纳米技术
冶金
有机化学
工程类
作者
Xiaolong Zhang,Guijing Li,Ruilan Tian,Wenjie Feng,Lei Wen
标识
DOI:10.1016/j.jallcom.2020.154149
摘要
Synergistic interaction is an improved and unique catalytic property that is superior to the catalytic effect of a counterpart when two or more materials are combined to form a composite. Copper-ceria composites are proven to be high-active materials for various catalytic reactions owing to the synergistic interaction between Cu species and CeO2 that endowed them exceptional redox and catalytic performances. In this study, CuO/CeO2 nanorod composites were fabricated by a facile alloying-dealloying strategy along with calcination for CO oxidation. The obtained CuO/CeO2 displayed a porous framework structure in which highly dispersed CuO were in-situ loaded on the surfaces of CeO2 nanorods. XRD studies revealed the incorporation of Cu ions into the CeO2 lattice, resulting in the formation of abundant oxygen vacancies in the composites as evidenced by XPS results. The CuO/CeO2 nanorod catalyst prepared from Al85Ce10Cu5 alloy calcined at 500 °C exhibited high catalytic activity for CO oxidation, which can realize 98% CO conversion as low as 160 °C owing to the strong synergistic interaction between dispersed CuO and CeO2 nanorods. Kinetic studies indicated a possible reaction mechanism over CuO/CeO2 catalyst: chemisorbed CO on reductive Cu+ species reacted with lattice oxygen activated in the oxygen vacancies of CeO2 nanorods.
科研通智能强力驱动
Strongly Powered by AbleSci AI