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Metadados | Descrição | Idioma |
---|---|---|
Autor(es): dc.contributor | University of Wisconsin-Madison | - |
Autor(es): dc.contributor | Utrecht University | - |
Autor(es): dc.contributor | Universidade Estadual Paulista (Unesp) | - |
Autor(es): dc.creator | De Bruyn, Mario | - |
Autor(es): dc.creator | Sener, Canan | - |
Autor(es): dc.creator | Petrolini, Davi D. [UNESP] | - |
Autor(es): dc.creator | McClelland, Daniel J. | - |
Autor(es): dc.creator | He, Jiayue | - |
Autor(es): dc.creator | Ball, Madelyn R. | - |
Autor(es): dc.creator | Liu, Yifei | - |
Autor(es): dc.creator | Martins, Leandro [UNESP] | - |
Autor(es): dc.creator | Dumesic, James A. | - |
Autor(es): dc.creator | Huber, George W. | - |
Autor(es): dc.creator | Weckhuysen, Bert M. | - |
Data de aceite: dc.date.accessioned | 2022-02-22T00:23:08Z | - |
Data de disponibilização: dc.date.available | 2022-02-22T00:23:08Z | - |
Data de envio: dc.date.issued | 2020-12-11 | - |
Data de envio: dc.date.issued | 2020-12-11 | - |
Data de envio: dc.date.issued | 2019-01-01 | - |
Fonte completa do material: dc.identifier | http://dx.doi.org/10.1039/c9gc00564a | - |
Fonte completa do material: dc.identifier | http://hdl.handle.net/11449/197949 | - |
Fonte: dc.identifier.uri | http://educapes.capes.gov.br/handle/11449/197949 | - |
Descrição: dc.description | Levoglucosanol (LGOL) is a critical intermediate for the bio-based production of hexane-1,2,5,6-tetrol, 1,2,6-hexanetriol, and 1,6-hexanediol. Here we report on the aqueous-phase hydrogenation of cellulose-derived dihydrolevoglucosenone (Cyrene™) to LGOL using a calcined and reduced heterogeneous copper/hydrotalcite/mixed oxide catalyst, denoted as Cu8/MgAlOx-HP. The turnover frequency for LGOL conversion over this copper-containing catalyst is equal to 0.013 s-1 at 353 K as measured in a flow reactor which is half the one obtained using 0.4 wt% Pd/Al2O3. Moreover, while Cu8/MgAlOx-HP shows a stable activity, the activity of 0.4 wt% Pd/Al2O3 decreases with time-on-stream. Neither Cu-nor Al-leaching is observed (resp. <1 ppb and <1 ppm) but Mg leaching can be seen (5.5 ppm). The latter leaching relates to the acidity of the Cyrene/H2O mixture (pH 3.5-4.5 range), which is due to the occurrence of the geminal diol moiety of Cyrene, an acidic species. In contrast, additional and consecutive oxidation and reduction of the catalyst leads to a gradual decrease in activity over time. Applying still further oxidation/reduction cycles to this catalyst tends to decrease its activity with some overall stabilization being observed from the fourth run onwards. Mg-leaching is shown to change the relative meso-to-macro pore content, but leaves the total pore volume unchanged between the fresh and the spent catalyst. In spite of the high copper loading (8 wt%), small Cu-nanoparticles (2-3 nm) are present over the hydrotalcite/mixed oxide surface of the Cu8/MgAlOx-HP material, and these particles do not aggregate during the hydrogenation reaction. | - |
Descrição: dc.description | Department of Chemical and Biological Engineering University of Wisconsin-Madison, 1415 Engineering Drive | - |
Descrição: dc.description | Faculty of Science Debye Institute for Nanomaterials Science Utrecht University, Universiteitsweg 99 | - |
Descrição: dc.description | Instituto de Química Unesp-Universidade Estadual Paulista, R. Prof. Francisco Degni 55 | - |
Descrição: dc.description | DOE Center for Advanced Bioenergy and Bioproducts Innovation University of Wisconsin-Madison, 1415 Engineering Drive | - |
Descrição: dc.description | Instituto de Química Unesp-Universidade Estadual Paulista, R. Prof. Francisco Degni 55 | - |
Formato: dc.format | 5000-5007 | - |
Idioma: dc.language | en | - |
Relação: dc.relation | Green Chemistry | - |
???dc.source???: dc.source | Scopus | - |
Título: dc.title | Catalytic hydrogenation of dihydrolevoglucosenone to levoglucosanol with a hydrotalcite/mixed oxide copper catalyst | - |
Tipo de arquivo: dc.type | livro digital | - |
Aparece nas coleções: | Repositório Institucional - Unesp |
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