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Impact of Support Oxide Acidity in Pt-Catalyzed HMF Hydrogenation in Alcoholic Medium

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Abstract

Silica and three mixed silica oxides (silica–alumina, silica–niobia, and silica–zirconia) with nominally 5 wt% of the added element (Al, Nb and Zr) were prepared and used as supports for dispersing monometallic Pt-nanoparticles. The presence of the second oxide component on the silica surface influenced some properties of the final samples, like surface area and acidity. The samples acidity was measured in a recirculation adsorption line with 2-phenylethylamine probe, by performing the titrations both in cyclohexane and in methanol to gather the intrinsic and effective acidity, respectively. The acid site density of silica–alumina was the highest compared with the other oxides; in general, an important decrease of acid sites density was determined in methanol. The order of the effective acidity in methanol was different from that determined in cyclohexane only for silica–zirconia and silica–niobia, confirming the peculiar acidity of Nb-oxide compounds in polar liquids: Colloidal spherical platinum nanoparticles were synthesized and then deposited (1 wt%) on the oxide supports. The obtained metallic nanophases were studied in the reduction of 5-hydroxymethylfurfural (HMF) to valuable chemicals such as dimethylfuran, dimethyltetrahydro-furan, 2-hexanol. In particular, this study focused on the impact of the acidity of the oxide supports on reaction selectivity when 2-butanol is used as solvent. When Pt is not present, Nb-doped silica is the most effective catalyst to di-hydroxymethyl furan diether (DHMFDE) derived from Meerwein–Ponndorf–Verley reaction, maintaining its Lewis character also in protic medium. In the presence of Pt, Nb-doped silica, however, presents the higher selectivity to hydrogenolysis products, 5-methyl furan (5-MF).

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Authors and Affiliations

  1. Institute of Chemistry, Physical Chemistry 1, Carl von Ossietzky University of Oldenburg, Carl-von-Ossietzky-Straße 9-11, 26129, Oldenburg, Germany

    Nhu Ly & Katharina Al-Shamery

  2. Dipartimento di Chimica, Università degli Studi di Milano, via Camillo Golgi, 19, 20133, Milano, Italy

    Carine E. Chan-Thaw, Laura Prati, Paolo Carniti & Antonella Gervasini

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  1. Nhu Ly
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  2. Katharina Al-Shamery
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  3. Carine E. Chan-Thaw
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  4. Laura Prati
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  5. Paolo Carniti
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  6. Antonella Gervasini
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Correspondence to Antonella Gervasini.

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Ly, N., Al-Shamery, K., Chan-Thaw, C.E. et al. Impact of Support Oxide Acidity in Pt-Catalyzed HMF Hydrogenation in Alcoholic Medium. Catal Lett 147, 345–359 (2017). https://doi.org/10.1007/s10562-016-1945-9

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  • DOI: https://doi.org/10.1007/s10562-016-1945-9

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