Exploring removal of formaldehyde at room temperature over Cr- and Zn-modified Co3O4 catalyst prepared by hydrothermal method

Xie, Junliang; Meng, Ming; Lin, Zhihao; Hua, Ding; Chen, Jianhua; Huang, Siyu; Zhou, Zhenming

doi:10.1007/s11164-019-04063-0

Cited by 13 publications

(7 citation statements)

References 61 publications

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“…As shown in Figure S10, the Co 3 O 4 support showed four typical bands at 477, 517, 614, and 685 cm –1 corresponding to the vibration modes of E g , F 2g , F 2g , and A 1g , respectively . Upon HF etching, all bands for the Co 3 O 4 -F- x supports became broad and weak, indicating the structural distortion of Co 3 O 4 , which was attributed to the generation of surface defects on the supports during HF etching . In addition, EPR spectra indicated that the content of oxygen vacancies on the Co 3 O 4 surface increased after HF etching.…”

Section: Resultsmentioning

confidence: 99%

“…30 Upon HF etching, all bands for the Co 3 O 4 -F-x supports became broad and weak, indicating the structural distortion of Co 3 O 4 , which was attributed to the generation of surface defects on the supports during HF etching. 31 In addition, EPR spectra indicated that the content of oxygen vacancies on the Co 3 O 4 surface increased after HF etching. As shown in Figure S11, the peak at g = 2.002 was attributed to the oxygen species adsorbed on oxygen vacancies on the Co 3 O 4 surface, and its intensity for the Co 3 O 4 -F-10 support was higher than that for the Co 3 O 4 support.…”

Section: Introductionmentioning

confidence: 99%

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Significant Improvement of Catalytic Performance for Chlorinated Volatile Organic Compound Oxidation over RuO_x Supported on Acid-Etched Co₃O₄

Líu

Yang

Jia

et al. 2021

Environ. Sci. Technol.

123

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Ru catalysts have attracted increasing attention in catalytic oxidation of chlorinated volatile organic compounds (CVOCs). However, the development of Ru catalysts with high activity and thermal stability for CVOC oxidation still poses significant challenges due to their restrictive relationship. Herein, a strategy for constructing surface defects on Co3O4 support by acid etching was utilized to strengthen the interaction between active RuO x species and the Co3O4 support. Consequently, both the dispersity and thermal stability of RuO x species were significantly improved, achieving both high activity and stability of Ru catalysts for CVOC oxidation. The optimized Ru catalyst on the HF-etched Co3O4 support (Ru/Co3O4-F) achieved complete oxidation of vinyl chloride at 260 °C under 30 000 mL·g–1·h–1, which was lower than 300 °C for the Ru catalyst on the original Co3O4 (Ru/Co3O4). More importantly, the Ru species on the Ru/Co3O4-F catalyst were hardly lost after calcination at 500–700 °C and even reacting at 650 °C for 120 h. On this basis, the polychlorinated byproducts over the Ru/Co3O4-F catalyst were almost completely effaced by phosphate modification on the catalyst surface. These findings show that the method combining acid etching of the support and phosphate modification provides a strategy for the advancement of catalyst design for CVOC oxidation.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Significant Improvement of Catalytic Performance for Chlorinated Volatile Organic Compound Oxidation over RuO_x Supported on Acid-Etched Co₃O₄

Líu

Yang

Jia

et al. 2021

Environ. Sci. Technol.

123

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“…The HCHO removal efficiency of the Ag/Cr/MnO 2 catalyst is higher than that of the Cr/Zn/Co 3 O 4 catalyst reported previously (HCHO removal efficiency was 96.6% under the concentration of the inlet of HCHO at 1 ppm). 23 In addition, the HCHO removal efficiency of the Cr/Zn/Co 3 O 4 catalyst dropped to about 82.9% after 23 h, while that of the Ag/Cr/MnO 2 catalyst did not change significantly, indicating that it had ideal stability for formaldehyde removal. Compared with the catalysts reported in the literature, 23,[65][66][67][68][69][70] the Ag/Cr/MnO 2 catalyst prepared in this work shows a better performance for removing HCHO at room temperature (Table 4).…”

Section: Catalytic Performancementioning

confidence: 90%

“…23 In addition, the HCHO removal efficiency of the Cr/Zn/Co 3 O 4 catalyst dropped to about 82.9% after 23 h, while that of the Ag/Cr/MnO 2 catalyst did not change significantly, indicating that it had ideal stability for formaldehyde removal. Compared with the catalysts reported in the literature, 23,[65][66][67][68][69][70] the Ag/Cr/MnO 2 catalyst prepared in this work shows a better performance for removing HCHO at room temperature (Table 4).…”

Section: Catalytic Performancementioning

confidence: 90%

Ag-promoted Cr/MnO₂ catalyst for catalytic oxidation of low-concentration formaldehyde at room temperature

Duan

Meng

Huang³

et al. 2023

Phys. Chem. Chem. Phys.

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“…Many researchers have been focused on improving catalytic behavior by combination between Co 3 O 4 and other appropriate metal oxides. Various chemical compositions have been studied, including transition metals, such as widely used Ce and Mn [4] (and references therein), Ni [13], Zn [14,15], and Cr [15,16]. Significant temperature lowering in complete formaldehyde oxidation was shown in the presence of supported noble metals.…”

Section: Introductionmentioning

confidence: 99%

Gold-Based Catalysts for Complete Formaldehyde Oxidation: Insights into the Role of Support Composition

et al. 2022

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Formaldehyde (HCHO) is recognized as one of the most emitted indoor air pollutants with high detrimental effect on human health. Significant research efforts are focused on HCHO removal to meet emission regulations in an effective and economically profitable way. For over three decades, the unique electronic properties and catalytic abilities of nano-gold catalysts continue to be an attractive research area for the catalytic community. Recently, we reported that mechanochemical mixing is a relevant approach to the preparation of Co-Ce mixed oxides with high activity in complete benzene oxidation. A trend of higher surface defectiveness, in particular, oxygen vacancies, caused by close interaction between cobalt oxide and cerium oxide phases, was observed for a mixed oxide composition of 70 wt.% Co3O4 and 30 wt.% CeO2. These results directed further improvement by promotion with gold and optimization of mixed oxide composition, aiming for the development of an efficient catalyst for room temperature HCHO abatement. Support modification with potassium was studied; however, the K addition caused less enhancement of HCHO oxidation activity than expected. This motivated the preparation of new carrier material. In addition to Co3O4-CeO2 mixed metal oxides with preset ratio, γ-Al2O3 intentionally containing 33% boehmite and shortly named Al2O3-b was used for synthesis. Analysis of the role of support composition in HCHO oxidation was based on the characterization of nano-gold catalysts by textural measurements, XRD, HRTEM, XPS, and TPR techniques. Gold supported on mechanochemically treated Co3O4-CeO2-Al2O3-b (50 wt.% Al2O3-b) exhibited superior activity owing to high Ce3+ and Co3+ surface amounts and the most abundant oxygen containing species with enhanced mobility. This catalyst achieved oxidation to CO2 and H2O by 95% HCHO conversion at room temperature and 100% at 40 °C, thus implying the potential of this composition in developing efficient catalytic materials for indoor air purification.

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Exploring removal of formaldehyde at room temperature over Cr- and Zn-modified Co3O4 catalyst prepared by hydrothermal method

Cited by 13 publications

References 61 publications

Significant Improvement of Catalytic Performance for Chlorinated Volatile Organic Compound Oxidation over RuO_x Supported on Acid-Etched Co₃O₄

Significant Improvement of Catalytic Performance for Chlorinated Volatile Organic Compound Oxidation over RuO_x Supported on Acid-Etched Co₃O₄

Ag-promoted Cr/MnO₂ catalyst for catalytic oxidation of low-concentration formaldehyde at room temperature

Gold-Based Catalysts for Complete Formaldehyde Oxidation: Insights into the Role of Support Composition

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Exploring removal of formaldehyde at room temperature over Cr- and Zn-modified Co3O4 catalyst prepared by hydrothermal method

Cited by 13 publications

References 61 publications

Significant Improvement of Catalytic Performance for Chlorinated Volatile Organic Compound Oxidation over RuOx Supported on Acid-Etched Co3O4

Significant Improvement of Catalytic Performance for Chlorinated Volatile Organic Compound Oxidation over RuOx Supported on Acid-Etched Co3O4

Ag-promoted Cr/MnO2 catalyst for catalytic oxidation of low-concentration formaldehyde at room temperature

Gold-Based Catalysts for Complete Formaldehyde Oxidation: Insights into the Role of Support Composition

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Significant Improvement of Catalytic Performance for Chlorinated Volatile Organic Compound Oxidation over RuO_x Supported on Acid-Etched Co₃O₄

Significant Improvement of Catalytic Performance for Chlorinated Volatile Organic Compound Oxidation over RuO_x Supported on Acid-Etched Co₃O₄

Ag-promoted Cr/MnO₂ catalyst for catalytic oxidation of low-concentration formaldehyde at room temperature