Reverse water-gas shift in a packed bed DBD reactor: Investigation of metal-support interface towards a better understanding of plasma catalysis

CO2 Hydrogenation at Atmospheric Pressure and Low Temperature Using Plasma-Enhanced Catalysis over Supported Cobalt Oxide Catalysts

“…Gas-phase reactions involve reactions R1 to R11. In addition, CO derived from CO 2 dissociation in the gas phase can adsorb on the catalyst surface and react with adsorbed hydrogen to form to methanol, as represented in Figure a. − CO 2 can also adsorb on the catalyst surface, as confirmed elsewhere with the detection of carbonates using in situ spectroscopy analysis. ,, Both ground and excited CO 2 can be adsorbed, although the contribution of excited CO 2 can be neglected because it is prone to quenching on the surface. , …”

“… 61 − 63 CO 2 can also adsorb on the catalyst surface, as confirmed elsewhere with the detection of carbonates using in situ spectroscopy analysis. 23 , 61 , 62 Both ground and excited CO 2 can be adsorbed, although the contribution of excited CO 2 can be neglected because it is prone to quenching on the surface. 26 , 64 …”

“…Yet there is an alternative to thermal catalysis: plasma-enhanced catalysis can be used for converting CO 2 to useful chemicals at near-ambient temperatures and pressures. − In nonthermal plasmas, high-energy electrons (with an average electron temperature of 1–10 eV) collide with stable molecules and activate them, while the bulk gas temperature remains low. , Catalysts can be introduced into these systems to increase the conversion and control the selectivity. , The most common option in plasma catalysis is the dielectric barrier discharge (DBD), among the different types of plasma discharges. This is because DBD reactors usually run at low temperatures and atmospheric pressure, reducing operating costs and complexity, and allow facile combination with catalysts. ,, …”

Plasma-Catalysis for Volatile Organic Compounds Decomposition: Complexity of the Reaction Pathways during Acetaldehyde Removal

“…As for carbonate species, they may be produced from acetates (Reactions (17) and (18)) [56,67,70]. Furthermore, an investigation carried out using supported TiO 2 catalysts in the presence of H 2 O 2 [58] has shown that formate species interaction with the surface can lead to carbonate and acetone formation (Reaction (19)). This latter possibility should be considered in our case, as NTP is able to generate H 2 O 2 .…”

“…They were able to show that unlike the thermal catalysis pathway, with the DBD process the first reaction intermediate is acetone. Plasma-assisted hydrocarbon selective catalytic reduction [17], catalytic steam-reforming of methane [18], reverse water-gas [19]/water-gas shift [20] and plasma-assisted CO 2 hydrogenation [21] processes have also been studied using in-situ DRIFTS. These works pointed out the fact that NTP is able to activate some of the species present either in the gas phase or on the surface, thus improving the performance of the PDC process.…”