Magnetic Fe@Y Composites as Efficient Recoverable Catalysts for the Valorization of the Recalcitrant Marine Sulfated Polysaccharide Ulvan

Jan Přech (1) , Efstathia Ioannou (2) , Vassilios Roussis (2) , Victor Kuncser , Iunia Podolean (3) , Simona Margareta Coman (3) , Valentin Valtchev (1) , Vasile I Parvulescu (3)

1 LCS - Laboratoire catalyse et spectrochimie
2 NKUA - National and Kapodistrian University of Athens
3 UniBuc - University of Bucharest

Magnetic Fe@Y composites (carbon coated magnetic iron nanoparticles incorporated in Y zeolite) with 5-8 wt% Fe were synthesized and characterized. Overall acidity of the samples ranges between 2.0 and 2.47 mmol/g and is given mostly by Lewis acid sites. The obtained materials were proven to catalyze the hydrolysis of Ulvan polysaccharide with high conversions. The distribution of the reaction products depends on the reaction conditions and the concentration of Ulvan. The catalytic properties-catalytic performances correlations clearly show the acid zeolite Y is the active phase for Ulvan hydrolysis while the iron nanoparticles enable the catalyst separation in a magnetic field. Under oxygen pressure, the selectivity was completely changed to succinic acid. All Fe@Y composites were recycled for 10 times with no change in the catalytic performances after a simple magnetic separation and washing with water.

Mots clés: Y zeolite; magnetic nanoparticles; ulvan; hydrolysis; oxidation

Domaines: Matériaux; Catalyse

Jan Přech, Efstathia Ioannou, Vassilios Roussis, Victor Kuncser, Iunia Podolean, et al.. Magnetic Fe@Y Composites as Efficient Recoverable Catalysts for the Valorization of the Recalcitrant Marine Sulfated Polysaccharide Ulvan. ACS Sustainable Chemistry & Engineering, 2019, 8 (1), pp.319-328. ⟨10.1021/acssuschemeng.9b05406⟩. ⟨hal-03035150⟩