Insight into the Ag-CeO2 interface and mechanism of catalytic oxidation of formaldehyde
Insight into the Ag-CeO2 interface and mechanism of catalytic oxidation of formaldehyde
复制标题
深入了解Ag-CeO2界面及甲醛催化氧化机理
DOI：
10.1016/j.apsusc.2021.149277
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发表时间：
2021-02-22
影响因子：
6.7
通讯作者：
Zhang, Zuotai
中科院分区：
文献类型：
--
作者：
Jiang, Guimin;Su, Yiping;Zhang, Zuotai
研究贵金属与载体之间的界面效应有助于设计高效、低成本的催化剂。两种Ag/CeO 2催化剂是通过使用两种具有明确晶面的CeO 2载体制备的：由{110}和{100}晶面包围的纳米棒（Ag/CeO 2-棒）和由{111}晶面包围的商业CeO 2。结果表明，Ag/CeO（2）棒是一种高效的催化剂，在80 ℃下可完全氧化甲醛。与商用CeO 2相比，CeO 2纳米棒具有更多的氧空位和表面活性氧物种，而Ag-CeO 2界面对氧空位和表面活性氧物种的形成起到了进一步的促进作用。HCHO在Ag-CeO 2界面上能快速吸附和氧化，具有较高的氧化活性。本文不仅提出了甲醛氧化的反应机理，而且为设计附加的高效、低成本催化剂提供了思路。
The interfacial effects between noble metals and supports should be well understood for the design of efficient and low-cost catalysts for HCHO removal. Two Ag/CeO2 catalysts were prepared by using two CeO2 supports with well-defined crystal planes: a nanorod enclosed with the {110} and {100} crystal planes (Ag/CeO2-rod) and commercial CeO2 enclosed with the {111} crystal plane. The reactivity results demonstrated that Ag/CeO(2)rod was a highly efficient active catalyst, which completely oxidized HCHO at 80 degrees C Compared to commercial CeO2, CeO2 nanorod had more oxygen vacancies and surface-active oxygen species, which were further promoted by the Ag-CeO2 interface. The HCHO could be quickly adsorbed and oxidized at the Ag-CeO2 interface, which led to the high reactivity for HCHO oxidation. This article not only proposes the reaction mechanism of HCHO oxidation but also provides ideas for the design of additional highly efficient and low-cost catalysts.