The driving force of the project involves strengthening the use of renewable raw materials with the intention of reducing the dependency of society in relation to petrochemical sources. The main theme of the proposal is the development of bifunctional catalysts with commercial MFI, BEA and MOR zeolites prepared by ion exchanged with vanadium salts, impregnation and chemical vapor deposition. The purpose of obtaining these bifunctional catalysts is to use them in catalytic conversion in one step of glycerol to acrylic acid. This is a two steps system, namely first the glycerol dehydration to acrolein on heterogeneous acid catalysts, and subsequently the oxidation of acrolein to acrylic acid by oxidizing catalysts, i.e. two catalytic reactors are used. The method of insertion of vanadium species and the reaction conditions such as temperature, concentration of O2 and H2O profoundly influence on the composition / oxidation state of the vanadium, whose interest in oxidative dehydration of glycerol is the oxidation state of V4+. Thus, it becomes essential to use advanced spectroscopic characterization techniques, in situ or in operando, in which one can obtain information about changes in the oxidation state, the structural organization of the short and long distance and on the formation of intermediate compounds, metastable in reaction conditions. Such assessments will be carried out in the Synchrotron Soleil in France, after the approval of the PhD project. Photoelectron X-ray spectroscopy , 51V RMN are additional techniques for the investigation of the chemical environment around the vanadium atoms. Additionally, we will evaluate the influence of the pore system in the conversion of glycerol to acrolein, considering the control of pores created in the zeolites by alkali treatment (desilication) and also the deactivation and determination/ quantification of coke.
News published in Agência FAPESP Newsletter about the scholarship: