TY - JOUR
TI - Magnetic Fe@Y Composites as Efficient Recoverable Catalysts for the Valorization of the Recalcitrant Marine Sulfated Polysaccharide Ulvan
AU - Přech, J.
AU - Ioannou, E.
AU - Roussis, V.
AU - Kuncser, V.
AU - Podolean, I.
AU - Coman, S.M.
AU - Valtchev, V.
AU - Parvulescu, V.I.
JO - ACS Sustainable Chemistry and Engineering
PY - 2020
VL - 8
TODO - 1
SP - 319-328
PB - American Chemical Society
SN - null
TODO - 10.1021/acssuschemeng.9b05406
TODO - Hydrolysis;  Iron;  Magnetic separation;  Nanocatalysts;  Nanoparticles;  Oxidation;  Synthesis (chemical);  Zeolites, Catalyst separation;  Catalytic performance;  Catalytic properties;  Magnetic nano-particles;  Recoverable catalysts;  Sulfated polysaccharides;  ulvan;  Zeolite-Y, Nanomagnetics
TODO - Magnetic Fe@Y composites (carbon-coated magnetic iron nanoparticles incorporated in zeolite Y) with 5-8 wt % Fe were synthesized and characterized. Overall acidity of the samples ranged between 2.0 and 2.47 mmol/g and is mostly attributed to Lewis acid sites. The obtained materials were proven to catalyze the hydrolysis of the marine sulfated polysaccharide ulvan with high conversion rates. The distribution of the reaction products depended on the reaction conditions and the concentration of ulvan. The catalytic property-catalytic performance correlations clearly showed that the acid zeolite Y is the active phase for the hydrolysis of ulvan, while the iron nanoparticles enable the catalyst separation in a magnetic field. Under oxygen pressure, the selectivity was completely changed to favor succinic acid production. All Fe@Y composites were recycled 10 times with no change in their catalytic performance after recovery via a simple magnetic separation and washing with water. Copyright © 2019 American Chemical Society.
ER -