Auto-redox Strategy for the Synthesis of Co3O4/CeO2 Nanocomposites and Their Structural Optimization Towards Catalytic CO Oxidation

doi:10.7503/cjcu20190649

Abstract

Abstract:

A simple auto-redox strategy was successfully used to synthesize Co₃O₄/CeO₂ nanocomposites. These samples were then characterized by means of TEM, XRD, XPS, and so on, to study the influence of reaction parameters on their catalyst activity. The results indicate that the catalytic performance of Co₃O₄/CeO₂ nanocomposites could be optimized by changing the molar ratio of Co/Ce, pH values, reaction and calcination temperatures. The optimal Co₃O₄/CeO₂ nanocomposite could reach a 100% CO conversion at 140 ℃ compared to the others. Moreover its catalytic activity kept stable after cycling, indicating its good stability.

Key words: Co₃O₄, CeO₂, Auto-redox, CO oxidation

CLC Number:

O643

TrendMD:

JIN Xin, FENG Xilan, LIU Dapeng, SU Yutong, ZHANG Zheng, ZHANG Yu. Auto-redox Strategy for the Synthesis of Co₃O₄/CeO₂ Nanocomposites and Their Structural Optimization Towards Catalytic CO Oxidation[J]. Chem. J. Chinese Universities, 2020, 41(4): 652.

Figures/Tables 12

Scheme 1 Synthetic process of Co3O4/CeO2 nanocomposites

Fig.1 TEM images(A—H) and XRD patterns(I, J) of Co3O4/CeO2 samples before(A—D, I) and after calcination(E—H, J)(A, E) Co1/Ce5; (B, F) Co5/Ce1; (C, G) Co9/Ce1; (D, H) Co15/Ce1; (I, J) a. CeO2; b. Co1/Ce5; c. Co5/Ce1; d. Co9/Ce1; e. Co15/Ce1.

Fig.2 CO conversions of Co3O4/CeO2 samples with different molar ratios of Co/Ce

Fig.3 CO conversions of Co3O4/CeO2 samples with different amounts of NaOH(aq)

Fig.4 CO conversions of Co3O4/CeO2 samples prepared at different temperatures

Fig.5 CO conversions of Co9/Co1-tC-300, Co9/Co1-tC-400 and Co9/Co1-tC-500

Fig.6 TEM(A), HRTEM(B) images and mapping analysis(C—F) of Co9/Ce1-tC-400

Fig.7 XPS spectra of Ce3d(A), Co2p(B), O1s(C) of Co9/Ce1-tC-400

Sample	S_BET/(m²·g^-1)	Pore volume/(cm³·g^-1)	Pore size/nm
Co₉/Ce₁-t_C-300	113.6700	0.230290	6.3285
Co₉/Ce₁-t_C-400	95.2122	0.277253	9.4890
Co₉/Ce₁-t_C-500	77.2589	0.221758	9.2293
Co₃O₄	19.5577	0.189476	29.7476
CeO₂	74.7081	0.097905	3.9790

Fig.8 H2-TPR profiles of Co9/Ce1(a), Co9/Ce1-3NaOH(b), Co9/Ce1-tR-60(c), Co9/Ce1-tC-400(d), Co3O4(e) and CeO2(f)

Fig.9 Cycling test curves of Co3O4/CeO2 nanocomposites

Sample	Amount of catalyst/mg	Feed gas	t₁₀₀/℃	Ref.
Co₃O₄@CeO₂ core@shell cubes	25	1%CO/20%O₂/79%N₂(30 mL/min)	190	[18]
CeO₂/Co₃O₄ yolk-shell nanospheres	100	1%CO/99%Air(30 mL/min)	110	[28]
Co₃O₄/CeO₂ nanosheets	30	1%CO/99%Air(30 mL/min)	140	[29]
CeO₂/Co₃O₄ nanojunctions	50	1%CO/99%Air(30 mL/min)	110	[32]
CeO₂@Co₃O₄ core@shell microspheres	50	1%CO/20%O₂/79%N₂(50 mL/min)	170	[31]
Co₃O₄/CeO₂ composites	25	1%CO/99%Air(30 mL/min)	140	This work

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Auto-redox Strategy for the Synthesis of Co₃O₄/CeO₂ Nanocomposites and Their Structural Optimization Towards Catalytic CO Oxidation

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