OL负载Cu催化剂及其催化氧化CO及乙酸乙酯性能

doi:10.3866/PKU.WHXB201704282

Abstract

Abstract:

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.

Key words: Octahedral layered birnessite, Cu_x/OL, Carbon monoxide, Ethyl acetate, Catalytic oxidation

Zhi-Dan FU,Jia-Xin ZANG,Qing YE,Shui-Yuan CHENG,Tian-Fang KANG. Cu-Doped Octahedral Layered Birnessites Catalysts for the Catalytic Oxidation of CO and Ethyl Acetate[J].Acta Phys. -Chim. Sin., 2017, 33(9): 1855-1864.

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

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