CuCoMgAlO x Mixed Oxides as Selective Catalysts for the Hydrogenation of Furan Compounds.

Autor: Kobzar, Elena O., Stepanova, Liudmila N., Nepomniashchii, Aleksandr A., Vasilevich, Anastasia V., Gulyaeva, Tatiana I., Trenikhin, Mikhail V., Lavrenov, Aleksandr V.
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Zdroj: Hydrogen; Sep2023, Vol. 4 Issue 3, p644-657, 14p
Abstrakt: Single phase CuCoMgAl-layered hydroxides were obtained by making fine adjustment to their composition through changing the (Co + Cu)/Mg = 0.5; 1; 2; 3 and Co/Cu = 0.5; 1; 2 ratios. The rise of Co/Cu in systems contributed to the increase in their thermal stability. CuCoMgAl-catalysts showed high selectivity of carbonyl group hydrogenation in furfural and 5-hydroxymethylfurfural. In furfural hydrogenation, the selectivity to furfuryl alcohol was more than 99%, and in 5-hydroxymethylfurfural hydrogenation, the selectivity to 2,5-hydroxymethyl furfural was 95%. The surface of the samples with different Co/Cu after calcination and reduction was the same and had a «core-shell» structure (TEM). «Core» consisted of Cu and Co metallic particles. «Shell» consisted of CuCoMgAlOx mixed no-stoichiometric spinel oxides. There was no sintering or change in size of the metallic particles after the reaction. For the sample with Co/Cu = 1, their phase composition after reaction remained unchangeable. The increase of Co/Cu led to the formation of an X-ray amorphous phase after the reaction. This suggests the decrease in structural stability of this sample. The obtained results prove the prospects of using bimetallic CoCu-systems for hydrogenation of furan aldehydes, and opens up new directions for further research and improvement. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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