The Design of MnOx Based Catalyst in Post-Plasma Catalysis Configuration for Toluene Abatement

Ye, Zhiping; Giraudon, Jean‐Marc; Geyter, Nathalie De; Morent, Rino; Lamonier, Jean‐François

doi:10.3390/catal8020091

Cited by 44 publications

(35 citation statements)

References 85 publications

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“…No chemical, mineralogical nor structural characterizations were performed. MnO 2 is a reactive mineral 73 – 75 and is used to delay the availability of ‘free’ iron corrosion products (FeCPs) in the system. This results in a delay of quantitative MB discoloration 30 .…”

Section: Methodsmentioning

confidence: 99%

The key role of contact time in elucidating the mechanisms of enhanced decontamination by Fe0/MnO2/sand systems

Cao¹,

Alyoussef²,

Gatcha-Bandjun

et al. 2021

Sci Rep

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Metallic iron (Fe0) has shown outstanding performances for water decontamination and its efficiency has been improved by the presence of sand (Fe0/sand) and manganese oxide (Fe0/MnOx). In this study, a ternary Fe0/MnOx/sand system is characterized for its discoloration efficiency of methylene blue (MB) in quiescent batch studies for 7, 18, 25 and 47 days. The objective was to understand the fundamental mechanisms of water treatment in Fe0/H2O systems using MB as an operational tracer of reactivity. The premise was that, in the short term, both MnO2 and sand delay MB discoloration by avoiding the availability of free iron corrosion products (FeCPs). Results clearly demonstrate no monotonous increase in MB discoloration with increasing contact time. As a rule, the extent of MB discoloration is influenced by the diffusive transport of MB from the solution to the aggregates at the bottom of the vessels (test-tubes). The presence of MnOx and sand enabled the long-term generation of iron hydroxides for MB discoloration by adsorption and co-precipitation. Results clearly reveal the complexity of the Fe0/MnOx/sand system, while establishing that both MnOx and sand improve the efficiency of Fe0/H2O systems in the long-term. This study establishes the mechanisms of the promotion of water decontamination by amending Fe0-based systems with reactive MnOx.

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Section: Methodsmentioning

confidence: 99%

The key role of contact time in elucidating the mechanisms of enhanced decontamination by Fe0/MnO2/sand systems

Cao¹,

Alyoussef²,

Gatcha-Bandjun

et al. 2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…No chemical, mineralogical nor structural characterizations were performed. MnO 2 is a reactive mineral [63][64][65] and is used to delay the availability of 'free' iron corrosion products (FeCPs) in the system. This results in a delay of quantitative MB discoloration [30].…”

Section: Manganese Dioxide (Mno 2 )mentioning

confidence: 99%

The Key Role of Contact Time in Elucidating the Mechanism of Enhanced Decontamination by Fe0/mno2/sand Systems

Cao

Alyoussef

Gatcha-Bandjun

et al. 2021

Preprint

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Metallic iron (Fe0) has shown outstanding performances for water decontamination and its efficiency has been improved by the presence of sand (Fe0/sand) and manganese oxide (Fe0/MnOx). In this study, a ternary Fe0/MnOx/sand system is characterized for its discoloration efficiency of methylene blue (MB) in quiescent batch studies for 7, 18, 25 and 47 d. The objective was to understand the fundamental mechanisms of water treatment in Fe0/H2O systems using MB as an operational tracer of reactivity. The premise was that, in the short term, both MnO2 and sand delay MB discoloration by avoiding the availability of free iron corrosion products (FeCPs). Results clearly demonstrate no monotonous increase in MB discoloration with increasing contact time. As a rule, the extent of MB discoloration is influenced by the diffusive transport of MB from the solution to the aggregates at the bottom of the vessels (test-tubes). The presence of MnOx and sand enabled the long-term generation of iron hydroxides for MB discoloration by adsorption and co-precipitation. Results clearly reveal the complexity of the Fe0/MnOx/sand system, while establishing that both MnOx and sand improve the efficiency of Fe0/H2O systems in the long-term. This study establishes the mechanisms of the promotion of water decontamination by amending Fe0-based systems with reactive MnOx.

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“…The combination of non-thermal plasma (NTP) with catalysis has also attracted significant interest for VOCs decomposition, offering several advantages, namely energy efficiency, product selectivity and satisfactory carbon balance [83]. NTP consists of energetic electrons, ions, reactive radical species, neutral particles/molecules and UV photons (e−, O , HO 2 , HO , N 2 , O 3 , etc.).…”

Section: Gas Phase-solid Catalyst Total Oxidation Reactionsmentioning

confidence: 99%

General and Prospective Views on Oxidation Reactions in Heterogeneous Catalysis

Valange

Védrine

2018

Catalysts

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In this review paper, we have assembled the main characteristics of partial oxidation reactions (oxidative dehydrogenation and selective oxidation to olefins or oxygenates, as aldehydes and carboxylic acids and nitriles), as well as total oxidation, particularly for depollution, environmental issues and wastewater treatments. Both gas–solid and liquid–solid media have been considered with recent and representative examples within these fields. We have also discussed about their potential and prospective industrial applications. Particular attention has been brought to new raw materials stemming from biomass, as well as to liquid–solid catalysts cases. This review paper also summarizes the progresses made in the use of unconventional activation methods for performing oxidation reactions, highlighting the synergy of these technologies with heterogeneous catalysis. Focus has been centered on both usual catalysts activation methods and less usual ones, such as the use of ultrasounds, microwaves, grinding (mechanochemistry) and photo-activated processes, as well as their combined use.

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The Design of MnOx Based Catalyst in Post-Plasma Catalysis Configuration for Toluene Abatement

Cited by 44 publications

References 85 publications

The key role of contact time in elucidating the mechanisms of enhanced decontamination by Fe0/MnO2/sand systems

The key role of contact time in elucidating the mechanisms of enhanced decontamination by Fe0/MnO2/sand systems

The Key Role of Contact Time in Elucidating the Mechanism of Enhanced Decontamination by Fe0/mno2/sand Systems

General and Prospective Views on Oxidation Reactions in Heterogeneous Catalysis

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