Synthesis of Flower-like Structured Mn/CuO-CeO2 and the Catalytic Performance for CO Oxide Reaction †

doi:10.7503/cjcu20190382

Abstract

Abstract:

The unique properties make CeO₂ play important roles in many catalytic reactions. However, CeO₂ alone as a catalyst is fairly unfavorable due to its low catalytic activity and poor stability for high-temperature reactions. Therefore, in this work, we constructed the composite of CeO₂ and transition metal oxides for the purpose of increasing the stability and improving the catalytic performance of CeO₂. We synthesized the Mn/CuO-CeO₂ composite nanomaterials with different components and three-dimensional flower-like structures via solvent thermal method. The XRD patterns confirmed that the synthesis formed solid solutions affording the single phase of fluorite-type CeO₂. And the SEM images showed the composites have flower-like structures which were assembled by numerous nanocrystals and the structural unit of each nanocrystal was nanoparticles with a size of about 10 nm. The catalytic activity of the catalyst increases successively in the order of CeO₂<CuO-CeO₂<xMn/CuO-CeO₂ mainly associated with the strong interaction between constituents owing to the highly dispersed copper and manganese species. And with the increase of Mn doping, the catalytic activity of the composite increases first and then decreases. When n_Ce∶n_Cu∶n_Mn=25∶5∶2, the catalyst exhibited the best catalytic performance: the complete transformation of CO can be achieved at 173 ℃ in CO oxidation test, and it showed good stability.

Key words: CeO₂, CuO, Composite nanomaterial, Oxidation of CO, Synergy

CLC Number:

O643

TrendMD:

Long TIAN,Yan LONG,Shuyan SONG,Cheng WANG. Synthesis of Flower-like Structured Mn/CuO-CeO₂ and the Catalytic Performance for CO Oxide Reaction ^†[J]. Chem. J. Chinese Universities, 2019, 40(12): 2549.

Figures/Tables 8

Scheme 1 Synthetic process of xMn/CuO-CeO2

Fig.1 XRD pattern(A), mean particle size distribution(B) and SEM images(C, D) of 0.08Mn/CuO-CeO2 Image (D) is enlarged part of image (C).

Fig.2 SEM images of samples obtained at different reaction time Reaction time/h: (A) 1; (B) 3; (C) 5; (D) 7.

Fig.3 SEM images of samples synthesized with different dosages of NaOH NaOH dosage/mL:(A) 0; (B) 1; (C) 2; (D) 3; (E) 4; (F) 5.

Sample	Molar ratio of Ce/Cu/Mn		Sample	Molar ratio of Ce/Cu/Mn
Sample	In precursor	In product	Sample	In precursor	In product
CeO₂	25:0:0	25:0:0	0.08Mn/CuO-CeO₂	25:5:2	25:5.18:1.73
CuO-CeO₂	25:5:0	25:5.09:0	0.20Mn/CuO-CeO₂	25:5:5	25:5.37:5.10
0.04Mn/CuO-CeO₂	25:5:1	25:4.89:0.87

Fig.4 XRD patterns(A, B) and SEM images(C—G) of CeO2, CuO-CeO2 and xMn/CuO-CeO2 a. CeO2; b. CuO-CeO2; c. 0.04Mn/CuO-CeO2; d. 0.08Mn/CuO-CeO2; e. 0.20Mn/CuO-CeO2; (C) CeO2; (D) CuO-CeO2; (E) 0.04Mn/CuO-CeO2; (F) 0.08Mn/CuO-CeO2; (G) 0.20Mn/CuO-CeO2.

Fig.5 Catalytic activity of asprepared catalysts for CO oxide a. CeO2; b. CuO-CeO2; c. 0.04Mn/CuO-CeO2;d. 0.20Mn/CuO-CeO2; e. 0.08Mn/CuO-CeO2.

Fig.6 Stability test of 0.08Mn/CuO-CeO2 at 175 ℃(a) and 100 ℃(b)

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Synthesis of Flower-like Structured Mn/CuO-CeO₂ and the Catalytic Performance for CO Oxide Reaction ^†

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