Synergistic effect between Mn and Ce for active and stable catalytic wet air oxidation of phenol over MnCeOx

Liu, Geng; Chen, Bingbing; Yang, Jihao; Shui, Cailing; Ye, Songshou; Fu, Jile; Zhang, Nuowei; Xie, Jun; Chen, Bing Hui

doi:10.1016/j.apcata.2020.117774

Cited by 57 publications

(19 citation statements)

References 31 publications

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“…6a showed the Mn 2p spectrum of the catalysts, the peaks observed at 641.8 eV and 653.3 eV corresponded to Mn 3+ , and the peaks at 643.1 eV and 654.7 eV were attributed to Mn 4+ (Ferrel-Álvarez et al 2018). it is widely established that the higher ratio of Mn 4+ can introduce more available oxygen species (Wang et al 2013) and facilitate the redox cycling during reaction processes, which could promote catalytic activity (Geng et al 2020). The relative surface Mn 4+ ratio calculated by Mn 4+ /(Mn 3+ +Mn 4+ ) was displayed in Table 2, the surface Mn 4+ content on TiMn15-NS was 65.8%., the value increased to 76.7% with introducing Ce.…”

Section: Catalysts Characterizationmentioning

confidence: 99%

TiO2 nanosheet supported MnCeOx: a remarkable catalyst with enhanced low-temperature catalytic activity in o-DCB oxidation

Guo

Liu

et al. 2022

Environ Sci Pollut Res

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Morphology engineering was an effective strategy for 1,2-dichlorobenzene (o-DCB) oxidation. Herein, TiO 2 nanosheet supported MnCeO x (TiMn15Ce30-NS) showed excellent catalytic activity with T 50% = 156 o C and T 90% = 238 o C, which was better than the T 50% = 213 o C and T 90% = 247 o C for TiO 2 nano truncated octahedron supported MnCeO x (TiMn15Ce30-NTO). TiMn15Ce30-NS also exhibited enhanced water resistance (T 50% = 179 o C, T 90% = 240 o C), and good stability with the o-DCB conversion retained at 98.9%for 12 h at 350 o C. The excellent catalytic activity of TiMn15Ce30-NS could be mainly ascribed to the preferentially exposed {001} crystal plane which favored the higher concent of Mn 4+ along with surface active oxygen, as well as stronger interaction between MnO x and CeO x in TiMn15Ce30-NS. The present results deepen the understanding of the morphology-dependent effect on o-DCB oxidation.

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Section: Catalysts Characterizationmentioning

confidence: 99%

TiO2 nanosheet supported MnCeOx: a remarkable catalyst with enhanced low-temperature catalytic activity in o-DCB oxidation

Guo

Liu

et al. 2022

Environ Sci Pollut Res

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“… 19 − 21 In this system, the CWO activity has been attributed to the synergistic effect between manganese and cerium oxides, which improves the oxygen storage capacity and oxygen mobility on the catalyst surface, leading to higher catalytic activity than that of the single oxides. 19 , 22 …”

Section: Introductionmentioning

confidence: 99%

High-Ionic-Strength Wastewater Treatment via Catalytic Wet Oxidation over a MnCeO_x Catalyst

Daly

Fan

et al. 2022

ACS Catal.

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Catalytic wastewater treatment has rarely been applied to treat high-ionic-strength wastewater (HISWW) as it contains large amounts of catalyst poisons (e.g., Cl – ). This work investigates the catalytic wet oxidation (CWO) of phenol over a MnCeO x catalyst in the presence of high NaCl concentrations where the combination of MnCeO x and NaCl promoted the CWO of phenol. Specifically, in the presence of NaCl at a concentration of 200 g L –1 and MnCeO x at a concentration of 1.0 g L –1 , phenol (initially 1.0 g L –1 ) and total organic carbon (TOC) conversions were ∼98 and 85%, respectively, after a 24 h reaction. Conversely, under the same reaction conditions without NaCl, the catalytic system only achieved phenol and TOC conversions of ∼41 and 27%, respectively. In situ Attenuated Total Reflection infrared spectroscopy identified the nature of the strongly adsorbed carbon deposits with quinone/acid species found on Ce sites and phenolate species on Mn sites in the single oxides and on MnCeO x . The presence of high concentrations of NaCl reduced the carbon deposition over the catalyst, promoting surface oxidation of the hydrocarbon and reoxidation of the catalyst, resulting in enhanced mineralization. Moreover, the used MnCeO x catalyst in the salt water system was efficiently regenerated via a salt water wash under the reaction conditions, showing the great potential of MnCeO x in practical HISWW treatment.

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“…Tang et al [17] revealed that the hierarchical layer-stacking Mn-Ce composite oxide possessed superior physiochemical properties such as good lowtemperature reducibility, high manganese oxidation state, and rich adsorbed surface oxygen species which resulted in the enhancement of catalytic abilities. Geng et al [18] found that Ce can maintain the structure of the catalyst and prevent Mn 4+ and Mn 3+ from reducing to Mn 2+ , which had good stability. Meanwhile, Tian et al [19] found out that with the substitution of cobalt cations with Mn 3+ and Mn 4+ ions, the ratio Co 3+ /Co 2+ decreased and both electrical resistivity and thermal stability showed increasing trends, which attributed to the progressive incorporation of manganese induced structural defects favoring the formation of anionic vacancies and the restriction of the oxygen mobility.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Reaction Parameters and Light Hydrothermal Aging for Catalytic Combustion of Propane over Co-Mn-Ce Catalyst

Lei

Jin

Cui

et al. 2022

Journal of Chemistry

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A composite oxides’ Co-Mn-Ce catalyst was synthesized by a coprecipitation method, and the experiment was carried out to study the effects of reaction parameters and light hydrothermal aging on propane combustion over the Co-Mn-Ce catalyst. The influence of reaction temperature, propane concentration, oxygen concentration, water vapor, and hydrothermal aging was studied during the catalytic combustion of propane. The propane conversion significantly decreased by 10% when the propane concentration increased at 300°C and then further decreased from 80% to 40% as water vapor concentration increased from 0 to 10 vol.%. In addition, water vapor also prolonged the time required to reach equilibrium. After hydrothermal treatment, the catalyst obtained the lowest oxidation capacity of propane. Furthermore, the results of in situ DRIFTs and O2 temperature programmed desorption (O2-TPD) demonstrated that there were fewer oxygen species after hydrothermal aging, and carbonates were the main intermediates formed during the catalytic oxidation of propane.

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Synergistic effect between Mn and Ce for active and stable catalytic wet air oxidation of phenol over MnCeOx

Cited by 57 publications

References 31 publications

TiO2 nanosheet supported MnCeOx: a remarkable catalyst with enhanced low-temperature catalytic activity in o-DCB oxidation

TiO2 nanosheet supported MnCeOx: a remarkable catalyst with enhanced low-temperature catalytic activity in o-DCB oxidation

High-Ionic-Strength Wastewater Treatment via Catalytic Wet Oxidation over a MnCeO_x Catalyst

Effects of the Reaction Parameters and Light Hydrothermal Aging for Catalytic Combustion of Propane over Co-Mn-Ce Catalyst

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Synergistic effect between Mn and Ce for active and stable catalytic wet air oxidation of phenol over MnCeOx

Cited by 57 publications

References 31 publications

TiO2 nanosheet supported MnCeOx: a remarkable catalyst with enhanced low-temperature catalytic activity in o-DCB oxidation

TiO2 nanosheet supported MnCeOx: a remarkable catalyst with enhanced low-temperature catalytic activity in o-DCB oxidation

High-Ionic-Strength Wastewater Treatment via Catalytic Wet Oxidation over a MnCeOx Catalyst

Effects of the Reaction Parameters and Light Hydrothermal Aging for Catalytic Combustion of Propane over Co-Mn-Ce Catalyst

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High-Ionic-Strength Wastewater Treatment via Catalytic Wet Oxidation over a MnCeO_x Catalyst