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Ramesh Debecker NaAlO2 - boehmite spray drying glycerol acetin - preprint.pdf (1.44 MB)
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Highly Basic Solid Catalyst Obtained by Spray Drying of a NaAlO2 and Boehmite Suspension for the Upgrading of Glycerol to Acetins

preprint
submitted on 08.02.2020 and posted on 10.02.2020 by Sreerangappa Ramesh, Makhlouf Amoura, Damien Debecker

In here, we present the low-cost production of NaAlO2-Al2O3 catalysts, which exhibit high activity in the transesterification of methyl acetate with glycerol to obtain acetins. The catalyst preparation procedure is based on the spray drying of a colloidal boehmite suspension, supplemented with a sodium aluminate (NaAlO2) solution using a pilot scale spray drier. Upon subsequent calcination, we obtain spherical micro particles presenting a homogeneous dispersion of sodium aluminate and featuring high basicity. The NaAlO2 loading has a marked impact on the basicity and textural properties of the final materials. These solids are found to be efficient heterogeneous base catalysts for the upgrading of glycerol (which is essentially a waste) to glycerol acetins (which are important bio-based fuel additives). With 100 mg of the catalyst loaded with 20 wt.% of NaAlO2, a conversion of 96 % is obtained after 4 h of reaction at 60 °C (10 mmol of glycerol + 100 mmol of methyl acetate). Importantly, the selectivity for triacetin is as high as 20 % (the rest being 50 % of diacetin and 30 % of monoacetin). The catalysts act strictly in a heterogeneous way and are recyclable.

Funding

Région Wallonne - BEWARE programme convention n°1410279

History

Email Address of Submitting Author

damien.debecker@uclouvain.be

Institution

Université catholique de Louvain (UCLouvain)

Country

Belgium

ORCID For Submitting Author

0000-0001-6500-2996

Declaration of Conflict of Interest

No conflict of interest

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