Citation: FU Zhi-Dan, ZANG Jia-Xin, YE Qing, CHENG Shui-Yuan, KANG Tian-Fang. Cu-Doped Octahedral Layered Birnessites Catalysts for the Catalytic Oxidation of CO and Ethyl Acetate[J]. Acta Physico-Chimica Sinica, ;2017, 33(9): 1855-1864. doi: 10.3866/PKU.WHXB201704282 shu

Cu-Doped Octahedral Layered Birnessites Catalysts for the Catalytic Oxidation of CO and Ethyl Acetate

Key Laboratory of Beijing on Regional Air Pollution Control, Beijing University of Technology, Beijing 100124, P. R. China

Received Date: 17 March 2017
Revised Date: 20 April 2017

Fund Project: The project was supported by the National Natural Science Foundation of China (21277008, 20777005) and Natural Science Foundation of Beijing, China (8082008) and Project of Construction of Innovative Teams and Teacher Career Development for Universities and Colleges Under Beijing Municipality (IDHT20140504)

Octahedral layered birnessite (denoted as OL) was synthesized by the oxidation-reduction method and a series of Cu_x/OL catalysts were prepared by the ion exchange method with various Cu loadings. The materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), N₂ adsorption-desorption, hydrogen temperature-programmed reduction (H₂-TPR), X-ray photoelectron spectroscopy (XPS), thermogravimetric (TG) and.oxygen temperature-programmed desorption (O₂-TPD) techniques, and their catalytic activities for CO and ethyl acetate oxidation were evaluated. The results show that OL is a typical octahedral layered structure, and the doping of Cu hardly affects the structure of OL. Moreover, Cu_x/OL samples had different reducibility, oxygen mobility, and atomic ratio of Cu²⁺/CuO, (Mn²⁺+Mn³⁺)/Mn⁴⁺, and O_ads/O_latt after the addition of Cu to OL. Among the Cu_x/OL samples, the Cu₅/OL sample showed the best activity for the catalytic oxidation of CO and ethyl acetate (T₅₀=70 and T₉₀=100℃ for CO oxidation; T₅₀=160℃ and T₉₀=200℃ for ethyl acetate oxidation). Cu₅/OL showed the best reducibility, most isolated Cu²⁺ species, highest surface (Mn²⁺+Mn³⁺)/Mn⁴⁺ atomic ratio, highest chemisorbed oxygen species, and lowest O₂ desorption temperature. Hence, factors such as the strong interaction between copper and manganese, good reducibility, and oxygen mobility were responsible for the excellent catalytic activity of Cu₅/OL.
- Octahedral layered birnessite,
- Cu_x/OL,
- Carbon monoxide,
- Ethyl acetate,
- Catalytic oxidation
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