Improving the energy efficiency of CO_{2}$ conversion in nonequilibrium plasmas through pulsing
| Autor: | Vincent Vermeiren, Annemie Bogaerts |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Quantitative Biology::Molecular Networks Physics Non-equilibrium thermodynamics 02 engineering and technology Plasma 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Dissociation (chemistry) 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Chemistry General Energy Chemical physics Physics::Atomic and Molecular Clusters natural sciences Physics::Chemical Physics Physical and Theoretical Chemistry 0210 nano-technology Engineering sciences. Technology Efficient energy use |
| Zdroj: | The journal of physical chemistry: C : nanomaterials and interfaces |
| ISSN: | 1932-7447 |
| Popis: | Nonequilibrium plasmas offer a pathway for energy-efficient CO2 conversion through vibrationally induced dissociation. However, the efficiency of this pathway is limited by a rise in gas temperature, which increases vibrational–translational (VT) relaxation and quenches the vibrational levels. Therefore, we investigate here the effect of plasma pulsing on the VT nonequilibrium and on the CO2 conversion by means of a zero-dimensional chemical kinetics model, with self-consistent gas temperature calculation. Specifically, we show that higher energy efficiencies can be reached by correctly tuning the plasma pulse and interpulse times. The ideal plasma pulse time corresponds to the time needed to reach the highest vibrational temperature. In addition, the highest energy efficiencies are obtained with long interpulse times, that is, ≥0.1 s, in which the gas temperature can entirely drop to room temperature. Furthermore, additional cooling of the reactor walls can give higher energy efficiencies at shorter interpulse times of 1 ms. Finally, our model shows that plasma pulsing can significantly improve the energy efficiency at low reduced electric fields (50 and 100 Td, typical for microwave and gliding arc plasmas) and intermediate ionization degrees (5 × 10–7 and 10–6). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|