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| Title: | Preparation and Evaluation of Bimetallic Au Nano-Catalyst with Aerobic Oxidation of 1-Phenylethanol |
| Authors: | Nishimura, Shun
Takahashi, Takamasa
Yakita, Yusuke
Ebitani, Kohki |
| Issue Date: | 2015 |
| Publisher: | Materials Research Society |
| Magazine name: | MRS Proceedings |
| Volume: | 1758 |
| DOI: | 10.1557/opl.2015.373 |
| Abstract: | Contributions of electronic (or ligand) and geometric (or ensemble) effects on the AuM bimetallic nano-catalyst were elucidated by using a simple aerobic oxidation of 1-phenylethanol to acetophenone on the basis of difference in the ionization energy values (Ei) between Au and M elements. The poly(N-vinylpyrrolidone) (PVP)-protected Au_<60>M_<40> bimetallic NPs (M = Ag, Cu, Pd, Pt and Ir) were prepared with a polyol reduction method, and stabilized onto the solid base hydrotalcite support affording the Au_<60>M_<40>-PVP/HT catalysts. The yields for acetophenone were observed as the following order; Au_<60>Pd_<40>-PVP/HT (>99%) >> Au_<60>Ag_<40>-PVP/HT (17.4%) > Au_<60>Cu_<40>-PVP/HT (13.8%) > Au_<60>Pt_<40>-PVP/HT (7.1%) > Au_<60>Ir_<40>-PVP/HT (5.5%), at 343 K for 6 h. Differences in the Ei between Au and M (Ei_<Au>-Ei_M) indicted that the yields over the Ag, Cu, Pt, and Ir incorporated Au catalysts were well-understood on the ligand effects theory, though geometric factors such as differences in nanostructure around Au atom in Au_<60>M_<40> NPs on HT should be further considered as other contributed factors. The significant activity on Au_<60>Pd_<40>-PVP/HT was studied in terms of the electron density of Pd atoms. It was observed that the Pd 4d density was varied by the amount of Au loading. According to these observations combined with our previous studies, we suggest that the advantages in AuPd bimetallic catalyst are not only in the ligand effect serving negatively-charged Au but also the ensemble effect of neighbor Pd, and they synergistically contribute to the novel activity for aerobic alcoholoxidation over AuPd catalyst. |
| Rights: | Copyright (C) 2015 Materials Research Society. Shun Nishimura, Takamasa Takahashi, Yusuke Yakita and Kohki Ebitani, MRS Proceedings, 1758, 2015, DOI:10.1557/opl.2015.373. http://dx.doi.org/10.1557/opl.2015.373 |
| URI: | http://hdl.handle.net/10119/13507 |
| Material Type: | publisher |
| Appears in Collections: | c11-1. 会議発表論文 (Conference Papers)
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