Omar Biondo

My name is Omar and I am from Treviso, Italy. My background is in environmental science and technology with a particular focus on plasma chemistry and applications for water treatment. I obtained my Master in Land and Environmental Science and Technology in 2018 from the University of Padova. After graduating, I had the chance to work for 18 months at the Department of Chemistry as research fellow focusing on the characterization of the reactive species involved in the degradation of water pollutants and the degradation efficiency of non-thermal plasma for perfluoroalkyl substances removal. From here, a growing interest regarding the potential of plasmas for green processes was raised in me and I have found in the PIONEER project the opportunity to actively contribute to give answers to environmental challenges.

Now I am a doctoral student in chemistry under the supervision of Professor Annemie Bogaerts at the University of Antwerp and the co-supervision of Professor Gerard van Rooij at the DIFFER Eindhoven. My research project is mostly centered on modelling of chemical kinetics and fluid dynamics as well as on conversion experiments and diagnostics of a microwave CO2 plasma. The purpose is to understand the underlying mechanisms involved in the conversion with the aim to improve its energy efficiency and make the technology accessible for industrial upscaling.

Overview Pioneer
ESR: 3
Title: Improving the energy efficiency of CO2 conversion and activation in a microwave plasma by a combination of experiments and modeling
Home Institution: University of Antwerp (UAntwerpen)
1st Supervisor: Annemie Bogaerts
Host Institution: Dutch Institute For Fundamental Energy Research (DIFFER)
2nd Supervisor: Gerard Van Rooij
Secondment: Instituto Superior Técnico, Universidade de Lisboa (IST-IPFN)

Objectives

Plasma-based CO2 conversion is worldwide gaining increasing interest. The aim of this project is to improve the energy efficiency of CO2 conversion in a microwave plasma (MW) beyond what is feasible in thermodynamic equilibrium. It has been demonstrated that microwave plasmas can yield very high energy efficiency for CO2 conversion, but typically only at reduced pressure. For industrial application, it will be important to realize such good energy efficiency at atmospheric pressure as well. However, current experiments at NWO-I illustrate that the microwave plasma at atmospheric pressure is too close to thermal conditions to achieve a high energy efficiency. In this project we will use a combination of modeling and experiments to better understand the underlying mechanisms of CO2 conversion in MW, in a wide range of conditions. This should allow us to predict how the conditions can be tuned to optimize the energy efficiency, in combination with a good conversion. The modeling will be based on both a 0D chemical kinetics model and a 2D plasma fluid dynamics model. The 0D model will describe the detailed plasma chemistry, with special focus on the vibrational kinetics of CO2, as the latter is known to play a crucial role in the energy efficient CO2 conversion. The model will also be extended to CO2 mixtures with H-source, such as CH4, H2O and H2, which is of great importance for the production of value-added chemicals out of CO2. The 2D plasma model will use simplified plasma chemistry, as obtained from the 0D model, and give information on the effect of various microwave plasma reactor designs and gas flow patterns, as well as on pulsed operation, on the CO2 conversion and energy efficiency. The experimental part will connect to the modeling by combining a study of the factors that deteriorate the non-thermal regime and mixtures with the same H-sources. Essential ingredients in unraveling the transition are pulsed operation in which response of gas temperature and plasma volume are recorded. The application of a comprehensive set of advanced diagnostics will allow comparison with and ultimately validation of the model predictions. In particular, laser scattering will be used for gas temperature profiles in time and space, as well as Fourier Transform Infrared Spectroscopy to monitor in and ex situ species evolution. The link to catalysis will be implemented in the afterglow of the plasma. In this region, Resonance Enhanced Multi-Photon Ionization will be employed to characterize species activation prior to interaction with the catalytic surfaces. Emphasis here will be on proving the possibility to separate species activation in the plasma phase from the reactivity (and selectivity) at the catalyst surface.

Links with other ESRs

  • All ESRs: Comparison of model approaches for optimization of vibrational kinetic description

Expected Results

  • Understanding of the role of the vibrational kinetics of CO2 on the CO2 conversion and energy efficiency in a microwave plasma in a wide range of conditions
  • Prediction of the most suitable conditions for the most energy efficient CO2 conversion, in pure CO2 and in mixtures with a H-source
  • Determination of most suitable condition for high vibrational excitation that could be used in combination with catalyst

Secondments

  • DIFFER: Use of plasma diagnostics equipment
  • IST-IPFN: Comparison of modeling approaches and numerical techniques