Oxygen-vacancy-promoted catalytic wet air oxidation of phenol from MnO<sub>x</sub>–CeO<sub>2</sub>

Ma, Changjian; Wen, Yaoyao; Yue, Qingqing; Li, Anqi; Fu, Jile; Zhang, Nouwei; Gai, Hengjun; Zheng, Jinbao; Chen, Binghong

doi:10.1039/c7ra04037g

Cited by 47 publications

(26 citation statements)

References 48 publications

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“…CuO as the active component of the catalyst showed diminished results; the removal rate of COD and VSS increased by 13% and 2%. Ce is a rare-earth element that is widely used in catalytic wet oxidation, and its excellent oxygen storage capacity can stabilize the crystal structure and prevent volume contraction [ 28 ], which allows the CuO/CeO 2 catalyst to exhibit catalytic activity in this environment.…”

Section: Resultsmentioning

confidence: 99%

Highly efficient degradation of pharmaceutical sludge by catalytic wet oxidation using CuO-CeO2/γ-Al2O3 as a catalyst

2018

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Pharmaceutical sludge is considered as a hazardous material with high treatment and disposal costs. In the present study, the catalytic wet oxidation (CWO) of pharmaceutical sludge by CuO-CeO2/γ-Al2O3 as the catalyst was investigated. The catalyst was prepared by traditional wet impregnation. The catalyst was characterized using X-ray Powder Diffraction (XRD) and Scanning Electron Microscopy (SEM). CWO was performed in an experimental batch reactor. Several parameters that could affect the catalytic degradation efficiency, including catalyst dose, temperature, time, oxygen pressure and pH, were investigated. Under optimum conditions, the highest removal rate of volatile suspended solids (VSS) was 87.3% and was achieved at 260°C for 60 min with an oxygen pressure of 1.0 MPa and 10 g/L of catalyst. At the same time, the chemical oxygen demand (COD) removal rate reached as high as 72.6%. This work implies that catalytic wet oxidation is a promising method for the highly efficient degradation of pharmaceutical sludge.

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Section: Resultsmentioning

confidence: 99%

Highly efficient degradation of pharmaceutical sludge by catalytic wet oxidation using CuO-CeO2/γ-Al2O3 as a catalyst

2018

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“…Compared to Jampaiah et al.’s previous work, the concentration of Mn 4+ is higher in our sample. According to Ma et al., the higher valence state of Mn ions can create more oxygen vacancy on CeO 2 . In addition, to confirm the relative concentration of different Mn oxidation states, in Figure S4, the Mn 3 s XPS spectrum for 10MnO x −mCeO 2 NR is shown.…”

Section: Resultsmentioning

confidence: 99%

NaBH₄ Surface Modification on CeO₂ Nanorods Supported Transition‐Metal Catalysts for Low Temperature CO Oxidation

2020

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In this report, CeO2 nanorods (CeO2NR) were first chemically etched by different amounts (0.6, 3 and 6 wt %) of NaBH4, which were employed to understand the etching effect on the support structure, surface defects, and reducibility of modified CeO2NR supports. The 6 wt % NaBH4 etched CeO2NR was further used as support materials to load transition‐metals (TM: Cu, Co, Ni, Fe and Mn) catalysts, in order to investigate the support etching effect on the reducibility and catalytic performance of CeO2NR supported TM catalysts. In comparison with the catalytic performance of CeO2NR supported TM catalysts in literature, the 6 wt % NaBH4 etched CeO2NR supported catalysts show clearly enhanced CO oxidation performance at lower temperature, which is mainly attributed to the created surface defects by boron doped CeO2 surface during NaBH4 chemical etching and strong metal‐support interaction.

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“…The maximum COD reduction and phenol conversion were observed to be 99.9 and 99.89% respectively with an oxidant ratio of 2.0 and reactor a temperature of 380°C , a pressure of 25 MPa, a residence time of 0.75 s, initial phenol concentration of 5 mM, and an Fe(NO 3 ) 3 •9H 2 O concentration of 10 mM. The COD removal efficiency went up The findings of Ma et al (2017) revealed that more oxygen concentration gives rise to better phenol oxidation in the catalytic reaction. They also observed almost similar values of COD removal and phenol reduction, which signifies that the catalyst lowered the formulation of detrimental intermediates.…”

Section: Effect Of Catalyst In Non-preheated Configurationmentioning

confidence: 85%

Supercritical water oxidation of phenol and process enhancement with in situ formed Fe2O3 nano catalyst

Al-Atta

Sher

Hazafa

et al. 2021

Environ Sci Pollut Res

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During the past few decades, the treatment of hazardous waste and toxic phenolic compounds has become a major issue in the pharmaceutical, gas/oil, dying, and chemical industries. Considering polymerization and oxidation of phenolic compounds, supercritical water oxidation (SCWO) has gained special attention. The present study objective was to synthesize a novel in situ Fe2O3nano-catalyst in a counter-current mixing reactor by supercritical water oxidation (SCWO) method to evaluate the phenol oxidation and COD reduction at different operation conditions like oxidant ratios and concentrations. Synthesized nano-catalyst was characterized by powder X-ray diffraction (XRD) and transmission electron microscope (TEM). TEM results revealed the maximum average particle size of 26.18 and 16.20 nm for preheated and non-preheated oxidant configuration, respectively. XRD showed the clear peaks of hematite at a 2θ value of 24, 33, 35.5, 49.5, 54, 62, and 64 for both catalysts treated preheated and non-preheated oxidant configurations. The maximum COD reduction and phenol oxidation of about 93.5% and 99.9% were observed at an oxidant ratio of 1.5, 0.75 s, 25 MPa, and 380 °C with a non-preheated H2O2 oxidant, while in situ formed Fe2O3nano-catalyst showed the maximum phenol oxidation of 99.9% at 0.75 s, 1.5 oxidant ratio, 25 MPa, and 380 °C. Similarly, in situ formed Fe2O3 catalyst presented the highest COD reduction of 97.8% at 40 mM phenol concentration, 1.0 oxidant ratio, 0.75 s residence time, 380 °C, and 25 MPa. It is concluded and recommended that SCWO is a feasible and cost-effective alternative method for the destruction of contaminants in water which showed the complete conversion of phenol within less than 1 s and 1.5 oxidant ratio.

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Oxygen-vacancy-promoted catalytic wet air oxidation of phenol from MnO_x–CeO₂

Abstract: The presence of oxygen vacancies can promote the formation of active oxygen species, which is essential for phenol oxidation.

Cited by 47 publications

References 48 publications

Highly efficient degradation of pharmaceutical sludge by catalytic wet oxidation using CuO-CeO2/γ-Al2O3 as a catalyst

Highly efficient degradation of pharmaceutical sludge by catalytic wet oxidation using CuO-CeO2/γ-Al2O3 as a catalyst

NaBH₄ Surface Modification on CeO₂ Nanorods Supported Transition‐Metal Catalysts for Low Temperature CO Oxidation

Supercritical water oxidation of phenol and process enhancement with in situ formed Fe2O3 nano catalyst

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Oxygen-vacancy-promoted catalytic wet air oxidation of phenol from MnOx–CeO2

Abstract: The presence of oxygen vacancies can promote the formation of active oxygen species, which is essential for phenol oxidation.

Cited by 47 publications

References 48 publications

Highly efficient degradation of pharmaceutical sludge by catalytic wet oxidation using CuO-CeO2/γ-Al2O3 as a catalyst

Highly efficient degradation of pharmaceutical sludge by catalytic wet oxidation using CuO-CeO2/γ-Al2O3 as a catalyst

NaBH4 Surface Modification on CeO2 Nanorods Supported Transition‐Metal Catalysts for Low Temperature CO Oxidation

Supercritical water oxidation of phenol and process enhancement with in situ formed Fe2O3 nano catalyst

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Oxygen-vacancy-promoted catalytic wet air oxidation of phenol from MnO_x–CeO₂

NaBH₄ Surface Modification on CeO₂ Nanorods Supported Transition‐Metal Catalysts for Low Temperature CO Oxidation