The noble metals M (M = Pd, Ag, Au) decorated CeO2 catalysts derived from solution combustion method for efficient low-temperature CO catalytic oxidation: effects of different M loading on catalytic performances

Cui Xiuxiu; Zhang Xu; Yang YaqiChen TingWang Yude

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The noble metals M (M = Pd, Ag, Au) decorated CeO2 catalysts derived from solution combustion method for efficient low-temperature CO catalytic oxidation: effects of different M loading on catalytic performances

机译：The noble metals M (M = Pd, Ag, Au) decorated CeO2 catalysts derived from solution combustion method for efficient low-temperature CO catalytic oxidation: effects of different M loading on catalytic performances

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The noble metal nanoparticles have attracted attention due to their excellent catalytic performance for CO oxidation at low temperatures. M-CeO2 (M = Pd, Ag, Au) catalysts with different atomic ratios of M/Ce were deposited via solution combustion method. Among them, 3 at% Pd-CeO2, 5 at% Ag-CeO2 and 1 at% Au-CeO2 catalysts have better catalytic performances. Especially, 5 at% Ag-CeO2 catalyst shows better low-temperature CO oxidation performance. The catalytic activity for CO oxidation follows the follows the following sequence: 5 at% Ag-CeO2 (T-50 = 69 degrees C) > 3 at% Pd-CeO2 (T-50 = 99 degrees C) >1 at% Au-CeO2 (T-50 = 115 degrees C). Meanwhile, the catalysts are characterized by means of powder x-ray diffraction, scanning electron microscope, transmission electron microscopy, Raman spectroscopy, x-ray photoelectron spectroscopy, Brunauer-Emmett-Teller and H-2-TPR. The characterization results show that the 5 at% Ag-CeO2 catalyst has excellent catalytic activity due to the good dispersion of Ag nanoparticles, the specific surface area of the material, and the reduction catalyst between different valence ions. Moreover, the surface of the catalyst enhances the mutual synergy, effectively promotes the generation of oxygen vacancies, and increases the active oxygen content of the catalyst surface. Finally, the catalytic mechanism of M-CeO2 catalysts is summarized.

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来源
《Nanotechnology》 |2022年第41期|共14页
作者
Cui Xiuxiu; Zhang Xu; Yang YaqiChen TingWang Yude;
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作者单位

Yunnan Univ;

Suzhou Univ Sci & Technol;

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原文格式 PDF
正文语种英语
中图分类特种结构材料;
关键词
M-CeO2 catalysts; CO catalytic oxidation; low-temperature; synergistic effect; solution combustion method; PREFERENTIAL OXIDATION; OXYGEN VACANCIES; CARBON-MONOXIDE; SURFACE; NANOPARTICLES; CERIA; NANOCRYSTALS; AG/CEO2; SUPPORT; OXIDES;

The noble metals M (M = Pd, Ag, Au) decorated CeO2 catalysts derived from solution combustion method for efficient low-temperature CO catalytic oxidation: effects of different M loading on catalytic performances

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