Plasma-assisted catalysis for the destruction of CFC-12 in atmospheric pressure gas streams using TiO2

Wallis, Anna E.; Whitehead, J. Christopher; Zhang, Kui

doi:10.1007/s10562-006-9000-x

Cited by 80 publications

(51 citation statements)

References 32 publications

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“…However, UV radiation generated by plasma discharges is not always the controlling factor to activate photocatalysts 40 . Whitehead has suggested that electron-hole pairs can be created by electron impact upon the surface of photocatalysts since DBD can generate electrons of very similar energy (3 -4 eV) to the photons 13,41 , as shown in Eqs. 14-15.…”

Section: Methodsmentioning

confidence: 99%

Plasma-photocatalytic conversion of CO 2 at low temperatures: Understanding the synergistic effect of plasma-catalysis

Mei

Zhu

et al. 2016

Applied Catalysis B: Environmental

246

146

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A coaxial dielectric barrier discharge (DBD) reactor has been developed for plasma-catalytic conversion of CO2 into value-added chemicals at low temperatures (<150 o C) and atmospheric pressure. The effect of specific energy density (SED) on the performance of the plasma process has been investigated. In the absence of a catalyst in the plasma, the maximum conversion of CO2 reaches 21.7 %. The synergistic effect from the combination of plasma with photocatalysts (BaTiO3 and TiO2) at low temperatures contributes to a significant enhancement of both CO2 conversion and energy efficiency by up to 250%. The synergy of plasma-catalysis for CO2 conversion can be attributed to both the physical effect induced by the presence of catalyst pellets in the discharge and the photocatalytic surface reaction driven by the plasma.

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Section: Methodsmentioning

confidence: 99%

Plasma-photocatalytic conversion of CO 2 at low temperatures: Understanding the synergistic effect of plasma-catalysis

Mei

Zhu

et al. 2016

Applied Catalysis B: Environmental

246

146

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“…For both IPC as PPC configuration, heterogeneous catalyst material can be introduced into the reactor in several ways ( Fig. 1c) [24] demonstrated that a variety of catalysts which were originally investigated in the field of thermal catalysis show similar synergy when combined with NTP. These kind of catalysts include platinum-based catalysts [25], protonic zeolites, modified Y-zeolites, de-aluminated Y-zeolites, NaX and NaY zeolites, HZSM-5-supported manganese oxides and LaCoO 3 .…”

Section: Plasma Catalytic Mechanismsmentioning

confidence: 99%

“…Short-living oxidizing species cannot reach this post plasma catalyst [2]. It is clear that mainly ozone is decomposed catalytically, forming molecular and highly active atomic oxygen [21,24,44]. This phenomenon is described for a number of catalysts such as silica gel, porous alumina and metal oxides [8,11].…”

Section: Physical-chemical Effects During Plasma Catalytic Processesmentioning

confidence: 99%

Combining non-thermal plasma with heterogeneous catalysis in waste gas treatment: A review

Durme¹,

Dewulf²,

Leys³

et al. 2008

Applied Catalysis B: Environmental

676

379

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Plasma driven catalysis is a promising technology for waste gas treatment characterized by higher energy efficiencies, high mineralization rates and low by-product formation. The combination of heterogeneous catalysts with non-thermal plasma can be operated in two configurations: positioning the catalyst in the discharge zone (in-plasma catalysis) or downflow the discharge zone (post plasma catalysis).In a first part of the review, changes of plasma properties resulting from the introduction of catalyst material are discussed. It has been reported that discharge types can even change. Accordingly, it was reported that microdischarges are formed within the catalyst pores. Changing plasma characteristics can eventually result in enhanced production of new active species, increasing the oxidizing power of the plasma discharge.In a second part, it is discussed that plasma discharges also affect catalyst properties such as a change in chemical composition, enhancement in surface area or change of catalytic structure. These phenomena partially explain why catalyst adsorption kinetics of airborne pollutants are affected when exposed to plasma discharges.It is also reviewed that the synergy of combining plasma with catalysts can not only be attributed to the production of new reactive species. Also plasma photon emission or thermal hot-spots can initiate catalytic pollutant oxidation reactions.To conclude, an overview of recently published manuscripts concerning plasma catalysis for volatile organic compounds abatement is given. It is also discussed why heterogeneous plasma catalysis has high potential for the simultaneous abatement of NO x and hydrocarbons. #

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“…Degradation of the CFC-12 occurs through both reductive and oxidative processes on the TiO 2 [11]. In the plasma-catalysis system, it is thought [12] that the electrons in the discharge which typically have a mean energy of ~3.5 eV create electron hole-pair states in an analogous manner to UV excitation TiO 2 + e -(>3.2 eV) → h + + eIn this case, the plasma discharge is changing the electrical properties of the catalyst. Inspection of Fig.…”

Section: Destruction Of Cfc-12 Using Plasma Catalysismentioning

confidence: 99%

Plasma catalysis: A solution for environmental problems

Whitehead

2010

Pure and Applied Chemistry

Self Cite

163

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The combination of a nonthermal, atmospheric plasma with a catalyst is investigated as a means of destroying pollutants in waste gas streams. Using the examples of dichloromethane (DCM) and toluene in air streams, it is shown that the destruction of the pollutant can be increased whilst lowering the operating temperature, giving increasing energy efficiency. Unwanted by-products can also be reduced selectively by appropriate choice of catalyst and of the plasma-catalyst configuration. By studying the temperature dependence of plasma catalysis, some ideas can be obtained about the nature of the interaction between plasma and catalyst in the processing.

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Plasma-assisted catalysis for the destruction of CFC-12 in atmospheric pressure gas streams using TiO2

Cited by 80 publications

References 32 publications

Plasma-photocatalytic conversion of CO 2 at low temperatures: Understanding the synergistic effect of plasma-catalysis

Plasma-photocatalytic conversion of CO 2 at low temperatures: Understanding the synergistic effect of plasma-catalysis

Combining non-thermal plasma with heterogeneous catalysis in waste gas treatment: A review

Plasma catalysis: A solution for environmental problems

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