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Plasma assisted catalytic decomposition of CO2

Paper ID Volume ID Publish Year Pages File Format Full-Text
44931 46380 2016 10 PDF Available
Title
Plasma assisted catalytic decomposition of CO2
Abstract

•Plasma-catalytic conversion of CO2 is performed in a pulsed surface-wave sustained microwave discharge.•Study the influence of three different discharges, i.e. O2, Ar, or CO2 discharge, on catalyst properties.•Plasma-catalysis synergy gives increased conversion and energy efficiency.•Possible mechanism for CO2 decomposition on the catalyst surface and catalyst regeneration is reported.

In this research, conversion of carbon dioxide in the presence of TiO2 supported NiO catalyst has been investigated in a pulsed surface-wave sustained microwave discharge. The catalyst is prepared by combination of impregnation and plasma-treatment methods. The decomposition of TiO2 supported nickel nitrate was done by plasma, induced in three different gases (O2, Ar, CO2). NiO/TiO2 catalysts were formed. The supplied gas has a prominent effect on the chemical and physical properties of the prepared catalysts. The catalyst prepared with an Ar plasma increases almost by a factor of 2 the CO2 conversion and energy efficiencies, while the O2 or CO2 plasma prepared catalysts show little effect on the CO2 conversion in comparison with catalyst-free plasma assisted dissociation. The results from the catalyst characterization by different techniques demonstrated that Ar plasma pre-treatment resulted in formation of oxygen vacancies. Dissociative electron attachment of CO2 at the catalyst surface enhanced by oxygen vacancies and plasma electrons could explain the improved conversion and energy efficiency. A constant catalytic activity was observed indicating continuous catalyst regeneration under reactor conditions. A mechanism of plasma-catalysis synergy is proposed.

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Keywords
CO2 conversion; Microwave plasma; Plasma-catalysis; NiO/TiO2 catalyst; Oxygen vacancy
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Plasma assisted catalytic decomposition of CO2
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 190, 5 August 2016, Pages 115–124
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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