Elisabete Alegria

Title : Vanadium(V) complexes supported on porous MIL100(Fe) as catalyst for the peroxidative oxidation and adsorption of VOCs

Abstract:

In this work, the vanadium(V) complexes bearing the aroylhydrazone Schiff base 2-hydroxy-N'-((2-hydroxynaphthalen-1-yl)methylene)benzohydrazide ligand, [VO(OMe)L] (1) and [Et₃NH][VO₂L] (2) were synthesized, characterized and supported on porous MIL-100(Fe) MOF via an impregnation method forming the 1@MIL-100(Fe) and 2@MIL-100(Fe) composites. The immobilization of the vanadium compounds on MIL-100(Fe) was assessed by several characterization techniques, namely powder X-ray diffraction, UV/Vis, FTIR, SEM-EDS, ICP and BET surface area analysis, confirming the successful heterogenization of both vanadium complexes. Both complexes were screened as catalysts towards the oxidation of toluene, under homogenous (1 and 2) and heterogeneous (1@MIL-100(Fe) and 2@MIL-100(Fe)) conditions as well as for toluene adsorption. For the catalytic oxidation of toluene, the influence of several parameters such as type and amount of catalyst, type and amount of oxidant, reaction time, temperature, radical trapping and catalyst recycling (for heterogenous) was studied. Benzaldehyde, benzyl alcohol and benzoic acid were identified as the main products.

Audience take-away:

• Volatile Organic Compounds (VOCs): emission and risks;
• Available techniques for VOCs removal/control
• Catalytic Oxidation of VOCs as promising strategy
• Supported Catalysis.

Biography:

Elisabete Alegria got her Ph.D degree (2006) from Instituto Superior Técnico, University of Lisbon. She is Researcher (Core Member) at Centro de Química Estrutural (Coordination Chemistry and Catalysis Group) at Instituto Superior Técnico since 2009. She was appointed as Adjunct Professor (2007) at the Chemical Engineering Department of Instituto Superior de Engenharia de Lisboa (ISEL) from Polytechnic Institute of Lisbon. E.C.B.A. Alegria authored over 80 scientific papers, 4 patents, 3 book chapters, and over 100 scientific communications. Main research interests: Sustainable homogeneous and supported catalysis for VOCs conversion and Biomass valorization, green synthesis of metallic nanoparticles, mechanochemistry (synthesis and catalysis), molecular electrochemistry.