Abstract
Bayberry tannin (BT), a natural plant polyphenol, was used as a stabilizer to prepare supported platinum catalysts. Bayberry tannin was first grafted onto aminated SiO 2 beads and subsequently coordinate with Pt(IV) species. Then a series of heterogeneous Pt–bayberry tannin–SiO 2 (Pt–BT–SiO 2) catalysts was obtained after reduction with NaBH 4. The catalysts were characterized by UV–DR, XRD and TEM, and the coordination state of Pt(IV) with BT grafted on SiO 2 beads was investigated by XPS. It was found that the Pt–BT–SiO 2 catalysts were highly active and stable in aqueous hydrogenation of acrylic acid, α-methacrylic acid, allyl alcohol and 2-methyl-3-buten-2-ol. Moreover, the Pt–BT–SiO 2 catalysts could be conveniently recovered from the reaction systems simply by filtration, and be reused at least five times without loss of activity.
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