| Autor: |
Sreerangappa Ramesh, Makhlouf Amoura, Damien P. Debecker |
| Přispěvatelé: |
UCL - SST/IMCN/MOST - Molecular Chemistry, Materials and Catalysis |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
Sustainable Energy & Fuels, Vol. 4, no.7, p. 3546-3551 (2020) |
| DOI: |
10.26434/chemrxiv.11826771 |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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