In situ study of ozone and hybrid plasma Ag–Al catalysts for the oxidation of toluene: Evidence of the nature of the active sites

Măgureanu, Monica; Piroi, Daniela; Mandache, Nicolae Bogdan; Pârvulescu, Vasile I.; Pârvulescu, Viorica; Cojocaru, Bogdan; Cadigan, Chris; Richards, Ryan M.; Daly, Helen; Hardacre, Christopher

doi:10.1016/j.apcatb.2011.02.025

Cited by 55 publications

(20 citation statements)

References 29 publications

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“…Plasma reactions are very complicated processes both in the presence and in the absence of catalyst. Several mechanisms may explain the formation of reactive species when accelerated electrons collide with background gaseous molecules . The nature of the catalyst plays an important role on the type of formed reactive species and reaction mechanisms, as well as the product selectivity .…”

Section: Plasma Catalystmentioning

confidence: 99%

Plasma‐Based Indoor Air Cleaning Technologies: The State of the Art‐Review

Bahri

Haghighat

2014

CLEAN Soil Air Water

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The negative impact of the presence of volatile organic compounds (VOCs) on indoor air quality has motivated researchers to develop different air treatment technologies. Although, building mechanical ventilation systems can provide a comfortable thermal indoor environment, they are not capable of removing the VOCs effectively. Thus, other components must be integrated with them to be able to carry out this function. Plasmabased air treatment techniques are a series of processes in which a high voltage discharge is used for elimination of VOCs. Development of plasma-based methods, and their capabilities for chemical gas decomposition, has motivated designers to employ these methods for indoor air purification. This paper addresses the outcomes of a critical literature review on plasma-based air cleaner technologies, thermal to non-thermal plasma and plasma catalyst, and their application for indoor environment VOCs removal. The reaction mechanism, effect of different parameters on the performance of the method, and abilities and limitations of these methods are discussed. Different types of reactors and the most common used catalysts are classified. The role of the presence of the catalyst in improving the non-thermal plasma efficiency is reviewed. Finally, the scope of the future work to enhance the performance of this method for application in sustainable buildings is discussed.

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Section: Plasma Catalystmentioning

confidence: 99%

Plasma‐Based Indoor Air Cleaning Technologies: The State of the Art‐Review

Bahri

Haghighat

2014

CLEAN Soil Air Water

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“…As a conclusion, the first requisite for obtaining reliable and reproducible SERS results is to provide a valid procedure to obtain Ag colloidal systems with both stability and SERS activity. Silica or alumina could be employed as support of silver nanostructures in order to increase the stability of the colloidal suspensions . However, even if these materials are SERS inactive, spectral interferences with the SERS bands of the adsorbed molecules are possible.…”

Section: Characterization Of the Silver Colloidsmentioning

confidence: 99%

SERS investigation on the adsorption and photoreaction of 4‐nitroanisole in Ag hydrosols

Muniz‐Miranda

2013

J Raman Spectroscopy

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The adsorption of 4‐nitroanisole on silver colloidal nanoparticles was investigated by surface‐enhanced Raman spectroscopy (SERS). Actually, the chemical binding with a metal substrate may play a role in changing the electronic structure of this molecule, which can be considered a push–pull chromophore, because an internal charge‐transfer occurs between methoxy and nitrogroup. A SERS signal could be detected only in chloride‐activated silver colloids, but the spectrum recorded with green‐light excitation was not related to adsorbed 4‐nitroanisole, but to its azoderivative, formed by photoreduction of the nitrogroup on the surface of the silver substrate. Copyright © 2013 John Wiley & Sons, Ltd.

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“…Non‐thermal plasma exhibits high VOCs removal efficiency but low product selectivity . By combining non‐thermal plasma with catalytic technology (PC), the directed transformation of reactants is promoted and improves product selectivity . Many researchers have carried out extensive research on VOCs removal by PC .…”

Section: Introductionmentioning

confidence: 99%

Removal of toluene from industrial gas over 13X zeolite supported catalysts by adsorption‐plasma catalytic process

Yang

Tang

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND: To find an appropriate catalyst in the adsorption plasma catalytic process, degradation of toluene over 13X zeolite supported catalysts were studied. RESULTS: 13X zeolite exhibited excellent toluene adsorption capacity but weak catalytic ability. After loading Cu, Co, Ce and Mg active compounds by the impregnation method, adsorption capacity was reduced and catalytic performance was significantly improved. Co/13X exhibited good adsorption capacity and excellent catalytic performance, which carbon balance was 81.6% with 74.4% of CO x for toluene adsorption capacity of 0.51 mmol. The effect of cobalt loading and calcination temperature on Co/13X for toluene degradation were studied, and it was found that 5% and 500 ∘ C were the optimum loading value and calcination temperature. The characterization results of BET, FTIR, XRD, XPS and SEM were correlated with catalyst performance. CONCLUSIONS: The active compounds block the pores and reduce the specific surface area of 13X zeolite, but active sites of catalysts can decompose ozone to produce more atomic oxygen species. Co 3+ could form -complexation bonding with toluene and Co 3 O 4 is a P-type semiconductor, which has large oxygen adsorption capacity and converts oxygen into O − and O 2− easily. Co 3 O 4 present in Co/13X is the active point for toluene degradation by adsorption and plasma catalytic activity.

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In situ study of ozone and hybrid plasma Ag–Al catalysts for the oxidation of toluene: Evidence of the nature of the active sites

Cited by 55 publications

References 29 publications

Plasma‐Based Indoor Air Cleaning Technologies: The State of the Art‐Review

Plasma‐Based Indoor Air Cleaning Technologies: The State of the Art‐Review

SERS investigation on the adsorption and photoreaction of 4‐nitroanisole in Ag hydrosols

Removal of toluene from industrial gas over 13X zeolite supported catalysts by adsorption‐plasma catalytic process

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