Grigoria Vasileios Theochari is currently an Assistant Professor at the Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Sofia, Bulgaria. She holds a master’s degree in Chemical Engineering and completed her thesis research at the Bulgarian Academy of Sciences on the hydrogenation of CO₂ to CH₄ using nickel catalysts supported on silicates and aluminosilicates derived from waste materials. Her current research is focused on environmental and energy catalysis, particularly sustainable processes and waste valorization technologies. Her interests include the synthesis of three-dimensionally printed adsorbents and catalysts for CO₂ capture and low-temperature CO₂ methanation.