Characterization of Catalyst-Supported Dielectric Barrier Discharge Reactor

Abstract

The discharge properties and chemical reactions in plasma discharges using dielectric (alumina Al 2 O 3 ) barrier discharge (DBD) reactors supported with Fe 2 O 3 and TiO 2 catalyst layers have been characterized. Ozone (O 3 ) was used as a probe substance to monitor the chemical reactions driven by plasma discharges. The light emission from discharge gaps of the catalyst-supported DBD reactors due to plasma discharges was evaluated, using a monochromator equipped with a high dynamic range streak camera. It has been found that the catalyst layers of Fe 2 O 3 and TiO 2 do not obviously influence plasma discharges and O 3 generation. Light emission from the discharge gaps of the catalyst-supported DBD reactors is different possibly due to the difference in light absorption and scattering by catalyst layers. The mechanism of catalysis effect on PM oxidative removal over Fe 2 O 3 has been proposed, where Fe 2 O 3 layer has the highest light absorption effect compared with that of TiO 2 and Al 2 O 3 .

Synergetic effects of plasma and metal oxide catalysts on diesel soot oxidation

“…Metal oxides have synergetic effects on the soot oxidation promotion under plasma conditions. Refilling the metal oxides oxygen vacancies with O atoms produced in plasma discharge is the main reason for synergetic effect [31]. In order to investigate the synergy in this process, the synergy factor for SRE and CO 2 selectivity are defined as follow [54]:…”

“…NO + O → NO 2 (31) NO + O 3 → NO 2 + O 2 (32) NO x molecules as strong oxidants can refill the surface vacancies of metal oxides and provide sites for further oxidation reactions (Eqs. (33) and (34)).…”

“…This synergetic effect can be explained by the short-living reactive species formed in the discharge [30]. It has been suggested that these species play an important role in promoting the reoxidation of metal oxide vacancies generated in oxidation reaction in the discharge [31]. However, coupling mechanisms involved in this synergy have not been fully understood, and little information exists about the role of these reactive species [32].…”

A Novel Four-Way Plasma-Catalytic Approach for The After-Treatment of Diesel Engine Exhausts

“…In NTP, plasma produced oxidative reactive species, such as an O atom and O 3 , are responsible for the DPM oxidation at a relatively low temperature (eqs 1−3). 24 + → DPM O CO, CO 2…”

Upgrading of 4-methylanisole in a catalytic reactor with electric discharges: A novel approach to O-removal from bio-oils

“…The hybrid catalytic DBD plasma reactor is the combination of plasma and heterogeneous catalysts. The synergistic effect between plasma and catalyst increases the production of active species, enhances the energy efficiency and minimizes the production of unwanted products [46,[54][55][56][57].…”