Regeneration of Hopcalite used for the adsorption plasma catalytic removal of toluene by non-thermal plasma

Veerapandian, Savita Kaliya Perumal; Giraudon, Jean‐Marc; Onyshchenko, Iuliia; Krishnaraj, Chidharth; Sonar, Shilpa; Löfberg, Axel; Leus, Karen; Voort, Pascal Van Der; Lamonier, Jean‐François; Morent, Rino

doi:10.1016/j.jhazmat.2020.123877

Cited by 17 publications

(6 citation statements)

References 54 publications

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“…The transient productions reach the first maximum (shoulder) value between 1 and 3 min of plasma exposure and the second maximum value between 7 and 9 min of plasma exposure and return to baseline beyond 20 min of plasma treatment. This type of behavior has been previously observed over Hopcalite whether it is by thermal desorption [24] or NTP exposure [23]. Most of the CO 2 produced in the first minutes of NTP exposure is released in the gas phase and some surface sites are thus liberated.…”

Section: Effect Of Toluene Exposure Time On Apc Process Performancessupporting

confidence: 71%

“…This explains the good catalytic activity and maintained CO 2 selectivity of several sequences performed on Hopcalite. In our previous work, Veerapandian et al [23] proposed a detailed mechanism of toluene abatement. It was suggested that the catalytic oxidation of toluene follows a Mars and Van Krevelen mechanism.…”

Section: Characterization Of Catalystmentioning

confidence: 99%

“…Veerapandian et al [23] previously used Hopcalite (Purelyst MD101) as a bifunctional material in an APC process for the removal of 500 ppm of toluene in dry air. A three-step sequence has been adopted consisting of (i) an adsorption/storage stage (t 1 ≈ 300 min) consisting of a quasi-sorbent saturation of Hopcalite followed by (ii) a desorption step by air flushing to get rid of the reversibly adsorbed toluene and finally (iii) a discharge step (t 2 = 60 min) making use of an NTP generated in air at a discharge power of 44 W to oxidize adsorbed toluene into CO 2 and to regenerate the bifunctional catalyst.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption Followed by Plasma Assisted Catalytic Conversion of Toluene into CO2 on Hopcalite in an Air Stream

Sonar

Giraudon²,

Veerapandian

et al. 2021

Catalysts

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The abatement of toluene was studied in a sequential adsorption-plasma catalysis (APC) process. Within this process, Hopcalite was used as bifunctional material: as adsorbent (storage stage) and as catalyst via the oxidation of adsorbed toluene (discharge stage). It was observed that the desorption and oxidation activity of the adsorbed toluene was significantly affected the process variables. In addition, the adsorption time influenced the CO2 selectivity and CO2 yield by changing the interaction between the catalyst and the plasma generated species. At least four APC sequences were performed for each examined condition suggesting that Hopcalite is very stable under plasma exposure during all the sequences. Consequently, these results could contribute to advance the plasma–catalyst system with an optimal VOC oxidation efficiency. The catalytic activity, amount of toluene adsorbed, amount of toluene desorbed and product formation have been quantified by FT-IR. Moreover, the catalyst was characterized by XRD, H2-TPR, N2 adsorption–desorption analysis and XPS. Hopcalite shows a good CO2 selectivity and CO2 yield when the APC process is performed with an adsorption time of 20 min and a plasma treatment with a discharge power of 46 W which leads to a low energy cost of 11.6 kWh·m−3 and energy yields of toluene and CO2 of 0.18 (±0.01) g·kWh−1 and 0.48 (±0.06) g·kWh−1 respectively.

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Section: Effect Of Toluene Exposure Time On Apc Process Performancessupporting

confidence: 71%

Section: Characterization Of Catalystmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Adsorption Followed by Plasma Assisted Catalytic Conversion of Toluene into CO2 on Hopcalite in an Air Stream

Sonar

Giraudon²,

Veerapandian

et al. 2021

Catalysts

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“…The presence of the dielectric barrier limits the amount of energy and charge imparted to every microdischarge, resulting in the distribution of microdischarge over the entire electrode, which makes the DBD reactor suitable for applications such as O 3 generation and air cleaning [185] . In the DBD reactor, the catalyst is usually introduced as a packed bed in the form of pellets [186] , powder [187] , granules, or fibers. The presence of packing material in the discharge gap enhances the electric field near their contact points, increases the VOC residence time, and reduces the plasma volume, resulting in better VOC removal efficiency.…”

Section: In-plasma Catalysismentioning

confidence: 99%

Boosting VOCs elimination by coupling different techniques

Khawaja¹,

Veerapandian²,

Bitar³

et al. 2022

Chem Synth

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Volatile Organic Compounds (VOCs) are known to be hazardous and harmful to human health and the environment. In mixtures or during repeated exposures, significant toxicity of these compounds in trace amounts has been revealed. In vitro air-liquid interface approaches underlined the interest in evaluating the impact of repeated VOC exposure and the importance of carrying out a toxicological validation of the techniques in addition to the standard chemical analyses. The difficulties in sampling and measuring VOCs in stationary source emissions are due to both the complexity of the mixture present and the wide range of concentrations. The coupling of VOC treatment techniques results in efficient systems with lower operating energy consumption. Three main couplings are outlined in this review, highlighting their advantages and relevance. First, adsorption-catalysis coupling is particularly valuable by using adsorption and catalytic oxidation regeneration initiated, for example, by selective dielectric heating. Then, several key aspects of the plasma catalysis process, such as the choice of catalysts suitable for the non-thermal plasma (NTP) environment, the simultaneous removal of different VOCs, and the in situ regeneration of the catalyst by NTP exposure, are discussed. The adsorption-photocatalysis coupling technology is also one of the effective and promising methods for VOC removal. The VOC molecules strongly adsorbed on the surface of the photocatalyst can be directly oxidized by the photogenerated hole on the photocatalyst (e.g., TiO2).

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“…Therefore, many studies focus on the hybrid technologies of NTP coupled with other technologies [33][34][35][36]. Among these hybrid systems, plasma catalysis technology shows its advantages among the treatments of typically VOCs for its high selectivity and removal rate because the gas-phase reaction and catalyst surface reaction induces a synergistic effect of plasma and catalysts [37][38][39][40][41]. In previous studies, the enhancing effect of various transition metal oxides for the treatment of VOCs by NTP has been confirmed.…”

Section: Introductionmentioning

confidence: 99%

Chlorobenzene Removal Using DBD Coupled with CuO/γ-Al2O3 Catalyst

et al. 2021

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The removal of chlorobenzene using a dielectric barrier discharge (DBD) reactor coupled with CuO/γ-Al2O3 catalysts was investigated in this paper. The coupling of CuO enhanced the chlorobenzene degradation and complete oxidation ability of the DBD reactor, especially under low voltage conditions. The characterization of catalyst was carried out to understand the interaction between catalyst and plasma discharge. The effects of flow rate and discharge power on the degradation of chlorobenzene and the interaction between these parameters were analyzed using the response surface model (RSM). The analysis of variance was applied to evaluate the significance of the independent variables and their interactions. The results show that the interactions between flow rate and discharge power are not negligible for the degradation of chlorobenzene. Moreover, based on the analysis of byproducts, 4-chlorophenol was discriminated as the important intermediate of chlorobenzene degradation, and the speculative decomposition mechanism of chlorobenzene is explored.

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Regeneration of Hopcalite used for the adsorption plasma catalytic removal of toluene by non-thermal plasma

Cited by 17 publications

References 54 publications

Adsorption Followed by Plasma Assisted Catalytic Conversion of Toluene into CO2 on Hopcalite in an Air Stream

Adsorption Followed by Plasma Assisted Catalytic Conversion of Toluene into CO2 on Hopcalite in an Air Stream

Boosting VOCs elimination by coupling different techniques

Chlorobenzene Removal Using DBD Coupled with CuO/γ-Al2O3 Catalyst

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