Effect of Formic Acid Treatment on the Structure and Catalytic Activity of Co3O4 for N2O Decomposition

Wang, Yongzhao; Wei, Xuhui; Hu, Xiaobo; Zhou, Wei; Zhao, Yongxiang

doi:10.1007/s10562-019-02681-2

Cited by 74 publications

(29 citation statements)

References 45 publications

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“…The sequence was as follows: (i) N 2 purging, (ii) benzene and N 2 , (iii) O 2 , benzene, and N 2 , and (iv) the (i–iii) procedure was performed a further two times at 210 °C. N 2 purging at 210 °C on the surface dictates that the weakly chemisorbed O 2 – /O 2 2– molecule over Co 3 O 4 surfaces is selectively removed, while most of the surface lattice oxygen species remain on the Co 3 O 4 surface, on the basis of previous O 2 temperature-programed desorption studies of Co 3 O 4 . , As shown in Figure S10, the rise of CO 2 production immediately began after switching the feed gas from N 2 to ppm benzene in N 2 . Increasing the reaction time in benzene and N 2 decreased the CO 2 production rate.…”

Section: Resultsmentioning

confidence: 87%

“…In contrast, for Ag 1 /Co 3 O 4 , the IR bands of phenolate and p-benzoquinone were nearly absent after 3 min of O 2 /N 2 exposure at 200 °C (Figure 6B). This phenomenon indicates that Ag 1 /Co 3 O 4 exhibits faster decomposition rates of these surface species than pristine 40,41 As shown in Figure S10, the rise of CO 2 production immediately began after switching the feed gas from N 2 to ppm benzene in N 2 . Increasing the reaction time in benzene and N 2 decreased the CO 2 production rate.…”

Section: Resultsmentioning

confidence: 91%

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Activation of Oxygen on the Surface of the Co₃O₄ Catalyst by Single-Atom Ag toward Efficient Catalytic Benzene Combustion

et al. 2022

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Supported noble metal-based catalysts have been extensively studied for catalytic benzene combustion during the past decade because of their high activity. Despite the enormous significance of noble metal-based materials as benzene combustion catalysts, the key properties of catalytic active sites and the plausible benzene combustion mechanism are a matter of debate. Herein, a well-defined model catalyst consisting of single Ag atoms deposited on Co3O4 oxide surfaces has been prepared and used to provide mechanistic insights into the benzene combustion mechanism and the origins of the excellent reactivity of Ag. The single-atom Ag-on-Co3O4 catalyst exhibits excellent activity and stability for benzene combustion. T 100 (temperature required to reach 100% conversion of benzene) is achieved at 204 °C. Scanning transmission electron microscopy reveals that single Ag atoms on Co3O4 are anchored to Co3+ vacancy sites on the support surface. Single-atom Ag incorporates excess oxygen and activates abundant Ag–O–Co bonds for reaction with benzene, thereby enhancing catalytic activity. The plausible benzene combustion path over the single-atom Ag-on-Co3O4 catalyst is proposed to be benzene → phenolate → quinone → maleate → acetate → CO2 + H2O. The rate-limiting step is located in the maleate → acetate → CO2 + H2O cycle at a temperature of 200 °C. The feasibility of this reaction pathway was confirmed from diffuse reflectance infrared Fourier transform spectroscopy experiments. We anticipate that these observations will improve our understanding of surface chemical processes in heterogeneous catalysis and provide useful information for the rational design of high-performance catalysts for benzene combustion reactions.

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 91%

Activation of Oxygen on the Surface of the Co₃O₄ Catalyst by Single-Atom Ag toward Efficient Catalytic Benzene Combustion

et al. 2022

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“…It can be seen that the activity of the Co 3 O 4 -HNO 3 catalyst was improved compared to that of Co 3 O 4 . The result indicated that the Co 3 O 4 catalyst washed in a copper nitrate solution could bring out more active sites because of acid treatment , and thus exhibited improved catalytic activity.…”

Section: Resultsmentioning

confidence: 99%

Cu²⁺-Decorated Porous Co₃O₄ Nanosheets for Photothermocatalytic Oxidation of Toluene

Zhao

Jin

et al. 2020

ACS Appl. Nano Mater.

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Surface decoration has been demonstrated as one of effective ways of improving the catalytic activities of nanostructured materials. Herein, we report quenching as an effective synthetic strategy for decorating porous Co3O4 nanosheets. The hot Co3O4 nanosheets are poured into an aqueous solution of copper nitrate to obtain a surface Cu-decorated Co3O4 catalyst (Cu-Co3O4-Q). Cu-Co3O4-Q exhibits significant photothermocatalytic activity for toluene oxidation under irradiation of the full solar spectrum with light of 834 mW cm–2 (space velocity of 72000 mL g–1 h–1). The reaction rate of Cu-Co3O4-Q is 1.76 times higher than that of Co3O4. Comprehensive characterizations demonstrate that the Cu decoration is confined to the limited surface layers of Co3O4, different from a traditional hydrothermal synthesis method (Cu-Co3O4-T). Cu2+ substitution for Co2+ is preferred over Co3+ on the surface of Cu-Co3O4-Q and thus produces more active sites, leading to a catalytic activity comparable to that of partially supported noble-metal catalysts. The present work demonstrates that quenching is a facile and useful strategy for the decoration of nanostructured materials with enhanced photothermocatalytic performance.

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“…Five peaks at 195, 480, 521, 629, and 692 cm –1 are detected of Co 3 O 4 . They corresponded to the A 1g , E g , and 3× F 2g modes of Co 3 O 4 , respectively . For CeO 2 , a strong band was shown around 463 cm –1 , which was assigned to the F 2g mode.…”

Section: Resultsmentioning

confidence: 87%

“…They corresponded to the A 1g , E g , and 3× F 2g modes of Co 3 O 4 , respectively. 28 For CeO 2 , a strong band was shown around 463 cm −1 , which was assigned to the F 2g mode. Besides, there was a weak peak centered at about 263 cm −1 , which was ascribed to the second-order transverse acoustic (2TA) mode.…”

Section: Resultsmentioning

confidence: 95%

Zeolitic Imidazolate Framework-67-Derived CeO₂@Co₃O₄ Core–Shell Microspheres with Enhanced Catalytic Activity toward Toluene Oxidation

Fang

Chen

Zhou

et al. 2020

Ind. Eng. Chem. Res.

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In this work, a core–shell structured CeO2@Co3O4 catalyst was successfully prepared by using a zeolitic imidazolate framework-based material as a sacrificial template. The structure, morphology, and physicochemical characteristics of these materials were investigated by X-ray diffraction, N2 sorption, Fourier transform infrared spectroscopy, Raman spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, temperature-programmed desorption, and temperature-programmed reduction studies. Compared with pure Co3O4 and CeO2, the CeO2@Co3O4 sample displayed superior catalytic performance (T 90 = 225 °C) toward toluene oxidation. Results demonstrated that the CeO2@Co3O4 sample exhibited a core–shell structure, with hierarchically wrinkled surfaces. This unique structure, especially the interface between the core and the shell, endowed the CeO2@Co3O4 catalyst with better activity. In addition, there was a synergistic effect between cerium and cobalt oxides in the core–shell bimetallic sample, which was responsible for the improved performance of the material. Moreover, surface-active oxygen species involved and played a significant role in toluene oxidation.

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Effect of Formic Acid Treatment on the Structure and Catalytic Activity of Co3O4 for N2O Decomposition

Cited by 74 publications

References 45 publications

Activation of Oxygen on the Surface of the Co₃O₄ Catalyst by Single-Atom Ag toward Efficient Catalytic Benzene Combustion

Activation of Oxygen on the Surface of the Co₃O₄ Catalyst by Single-Atom Ag toward Efficient Catalytic Benzene Combustion

Cu²⁺-Decorated Porous Co₃O₄ Nanosheets for Photothermocatalytic Oxidation of Toluene

Zeolitic Imidazolate Framework-67-Derived CeO₂@Co₃O₄ Core–Shell Microspheres with Enhanced Catalytic Activity toward Toluene Oxidation

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Effect of Formic Acid Treatment on the Structure and Catalytic Activity of Co3O4 for N2O Decomposition

Cited by 74 publications

References 45 publications

Activation of Oxygen on the Surface of the Co3O4 Catalyst by Single-Atom Ag toward Efficient Catalytic Benzene Combustion

Activation of Oxygen on the Surface of the Co3O4 Catalyst by Single-Atom Ag toward Efficient Catalytic Benzene Combustion

Cu2+-Decorated Porous Co3O4 Nanosheets for Photothermocatalytic Oxidation of Toluene

Zeolitic Imidazolate Framework-67-Derived CeO2@Co3O4 Core–Shell Microspheres with Enhanced Catalytic Activity toward Toluene Oxidation

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Product

Resources

About

Activation of Oxygen on the Surface of the Co₃O₄ Catalyst by Single-Atom Ag toward Efficient Catalytic Benzene Combustion

Activation of Oxygen on the Surface of the Co₃O₄ Catalyst by Single-Atom Ag toward Efficient Catalytic Benzene Combustion

Cu²⁺-Decorated Porous Co₃O₄ Nanosheets for Photothermocatalytic Oxidation of Toluene

Zeolitic Imidazolate Framework-67-Derived CeO₂@Co₃O₄ Core–Shell Microspheres with Enhanced Catalytic Activity toward Toluene Oxidation