Mani, M and Mariyaselvakumar, M and Samikannu, A and Panda , A B and Konwar, L J and Mikkola, J P (2022) Continuous hydrocyclization of aqueous levulinic acid to ?-valerolactone over bi-functional Ru/NbOPO4/SBA-15 catalyst under mild conditions. Applied Catalysis A General, 643 .
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Herein, we demonstrate that surface acid-base properties have marked effect upon the performance (activity, selectivity and stability) of supported Ru catalysts upon tandem hydrocyclization (hydrogenation-dehydration) of aqueous levulinic acid. A mesoporous bi-functional Ru/NbOPO4/SBA-15 catalyst incorporating highly dispersed Ru sites and well balanced strong Bronsted acidic sites (optimum B/L and M+S/W ratio) was identified, which outperformed the benchmark monofuncational (Ru/SBA-15, Ru/MCM-41) and physically blended bifunctional catalysts (Ru catalysts mixed with acid co-catalysts e.g.NbOPO4/Amberlyst-15). Further, the catalyst also demonstrated remarkable stability in a fixed-bed reactor, maintaining steady activity and gamma-valerolactone selectivity (72-86%) during ca. 300 h time on stream (10 bar, 90-100 degrees C), corroborating its industrial potential. The exceptional performance and durability of the bi-functional catalyst was attributed to the presence of well dispersed hydrothermally and chemically stable acid (NbOPO4) and redox (Ru) sites.
|Uncontrolled Keywords:||Tandem hydrocyclization;?-valerolactone; Supported Ru-catalysts; Bi-functional catalyst; Flow chemistry; Catalyst deactivation; Vapour-phase hydrogenation; Form gamma-valerolactone, Selective hydrogenation; NI/TIO2 Catalyst; RU; Performance; Support; Conversion; Solvent|
|Divisions:||Material Science and Technology|
|Deposited By:||Dr Mita Tarafder|
|Deposited On:||27 Oct 2022 17:50|
|Last Modified:||27 Oct 2022 17:50|
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