Title: Electric fields on catalyst covered dielectric surfaces under plasma exposure
A crucial and unexplored parameter in plasma/catalyst coupling is the electric field (Efield) induced by plasma on catalytic surface. Not only the Efield is the driving force of the plasma that controls the production of reactive species, it can also modify the adsorption energy of any specie on the catalyst surface and therefore modify strongly their reactivity. This parameter is, however, difficult to determine in atmospheric pressure non-thermal plasmas because they constitute a highly transient and jittery system with low light output. Recent advances (by the applicant among others) have shown it to be possible to determine the electric field on a dielectric surface when under plasma exposure, however this property has never been measured on a catalytic surface.
This project is going to focus on measuring the electric field spatially and time resolved on a catalytic surface under direct plasma exposure. The plasmas that are going to be used are from the family of non-thermal atmospheric pressure plasmas in a dielectric barrier discharge (DBD) configuration and under kHz-range excitation. The DBDs are going to be produced under controlled atmosphere relevant for CO2 reforming, thus in mixtures of noble gas and CO2 and in a mixture of N2 and CO2. The electric field measurement method is going to be based on the Pockels effect. A. Sobota has been a pioneer of this technique applied to plasma jet and her expertise in field measurement is complementary to the plasma/catalyst coupling knowledge of the co-supervisor O. Guaitella. The Pockels-active element is going to be covered by several different types of catalysts also relevant for CO2 reforming, such as zeolites and CeO2 provided by other partners from the consortium (LCS-CAEN, IJLRA and CSIC-ICB).
Links with other ESRs: measurements performed with coating of catalysts
- For the first time ever measurement of electric field on catalyst exposed to plasma
- Determination of most efficient field configuration for CO2 dissociation on catalyst : necessary for design of new catalysts (in working area of Advanced catalyst for CO2 activation under plasma exposure)
Co-supervisor: Olivier Guaitella (CNRS-LPP), 18 months: The field measurements under plasma exposure performed at TU/e-EPG under A. Sobota supervision will be completed by measurements of the chemical species adsorbed on the surface by Infrared absorption technique developed at LPP for plasma/catalyst coupling studies. The field measurements under plasma exposure performed at TU/e-EPG under A. Sobota supervision will be completed by measurements of the chemical species adsorbed on the surface by Infrared absorption technique developed at LPP for plasma/catalyst coupling studies.
Industrial partner: Secondment at AFS will be done to explore all the excitation power source useable industrially, and their influence on field produced (1,5 months). Short additional secondments /short visits could be made in partner laboratories developing the coatings of catalyst in order for the ESR to have a deeper understanding of the materials studied (LCS-CAEN, AGH, UoB and CSIC-ICB)