Catalysis Today p. 109 - 116 (2019)
Update date:2022-08-11
Topics:
Candu, Natalia
El Fergani, Magdi
Verziu, Marian
Cojocaru, Bogdan
Jurca, Bogdan
Apostol, Nicoleta
Teodorescu, Cristian
Parvulescu, Vasile I.
Coman, Simona M.
The one-pot production of HMF from glucose was investigated in pure hot water and biphasic water/methylisobutylketone (MIBK) solvent using mesoporous Nb(0.02 and 0.05 mol%)-Beta zeolites obtained by a post synthesis methodology. The mesoporous Nb-Beta zeolites present residual framework Al-acid sites, extra-framework isolated Nb(V) and Nb2O5 pore-encapsulated clusters in which Nb(V)O-H exhibit moderate strength Br?nsted acidity. After optimization, the dehydration of glucose onto the Nb-modified Beta-zeolites occurred with a selectivity of 84.3% in HMF for a glucose conversion of 97.4%. This result has been obtained in a biphasic water/MIBK solvent and in the presence of NaCl, at 180 °C, after 12 h.
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