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Continuous hydrocyclization of aqueous levulinic acid to γ-valerolactone over bi-functional Ru/NbOPO4/SBA-15 catalyst under mild conditions
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen.
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2022 (Engelska)Ingår i: Applied Catalysis A: General, ISSN 0926-860X, E-ISSN 1873-3875, Vol. 643, artikel-id 118744Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

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 Brønsted 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 bi-functional 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 γ-valerolactone selectivity (72-86%) during ca. 300 h time on stream (10 bar, 90-100 oC), 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.

Ort, förlag, år, upplaga, sidor
Elsevier, 2022. Vol. 643, artikel-id 118744
Nyckelord [en]
Tandem hydrocyclization, γ-valerolactone, Supported Ru-catalysts, Bi-functional catalyst, Flow chemistry, Catalyst deactivation
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Kemi
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URN: urn:nbn:se:umu:diva-197463DOI: 10.1016/j.apcata.2022.118744ISI: 000827290500001Scopus ID: 2-s2.0-85133252862OAI: oai:DiVA.org:umu-197463DiVA, id: diva2:1677950
Tillgänglig från: 2022-06-28 Skapad: 2022-06-28 Senast uppdaterad: 2023-09-05Bibliografiskt granskad

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Samikannu, AjaikumarMikkola, Jyri-Pekka

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Applied Catalysis A: General
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Totalt: 162 träffar
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