[14p-PA14-1~4] 6.5 Surface Physics, Vacuum

[14p-PA14-2] Direct visualization of active site on the gold nanoparticulate catalyst with Environmental TEM

〇Tadahiro Kawasaki^1,2, Kaname Yoshida¹, Takafumi Ishida^2,3, Takayoshi Tanji^2,3 (1.JFCC, 2.Nagoya Univ., 3.GREEN)

Keywords:catalytic reactions,visualization,environmental TEM

In order to visualize and determine the active site on the gold nanoparticulate catalyst, in-situ TEM observation of Au/TiO₂ specimen during propene epoxidation has been done with our dedicated environmental TEM (ETEM). Since the catalytic reaction product, the propene oxide (PO), keep liquid form if surrounding pressure is controlled to be more than its vapor pressure (5×10⁴ Pa @RT), the TEM can then visualize the place where the liquid PO were produced. As a result, in-situ observations clearly revealed that the PO molecules were formed at the perimeter of Au/TiO₂ interface. This indicates that the active site where the reaction occurs was successfully defined.