Details

Autor(en) / Beteiligte

• Leus, K
• Concepcion, P
• Vandichel, M
• Meledina, M
• Grirrane, A
• Esquivel, D
• Turner, S
• Poelman, D
• Waroquier, M
• Van Speybroeck, V
• Van Tendeloo, G
• Garcia, H
• Van Der Voort, P

Titel

Au-UiO-66: a base free oxidation catalyst

Ist Teil von

• RSC advances, 2015-02, Vol.5 (29), p.22334-22342

Erscheinungsjahr

2015

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We present the in situ synthesis of Au nanoparticles within the Zr based Metal Organic Framework, UiO-66. The resulting Au-UiO-66 materials were characterized by means of N sub(2) sorption, XRPD, UV-Vis, XRF, XPS and TEM analysis. The Au nanoparticles (NP) are homogeneously distributed along the UiO-66 host matrix when using NaBH sub(4) or H sub(2) as reducing agents. The Au-UiO-66 materials were evaluated as catalysts in the oxidation of benzyl alcohol and benzyl amine employing O sub(2) as oxidant. The Au-MOF materials exhibit a very high selectivity towards the ketone (up to 100%). Regenerability and stability tests demonstrate that the Au-UiO-66 catalyst can be recycled with a negligible loss of Au species and no loss of crystallinity. In situ IR measurements of UiO-66 and Au-UiO-66-NaBH sub(4), before and after treatment with alcohol, showed an increase in IR bands that can be assigned to a combination of physisorbed and chemisorbed alcohol species. This was confirmed by velocity power spectra obtained from the molecular dynamics simulations. Active peroxo and oxo species on Au could be visualized with Raman analysis.