Catalysis of nanosized Pd metal catalyst deposited on Ti-containing zeolite by a photo-assisted deposition (PAD) method

Yamashita, Hiromi; Miura, Yuki; Mori, Kohsuke; Shironita, Sayoko; Masui, Yosuke; Mimura, Naoki; Ohmichi, Tetsutaro; Sakata, Takao; Mori, Hirotaro

doi:10.1351/pac200779112095

Pure Appl. Chem., 2007, Vol. 79, No. 11, pp. 2095-2100

http://dx.doi.org/10.1351/pac200779112095

Catalysis of nanosized Pd metal catalyst deposited on Ti-containing zeolite by a photo-assisted deposition (PAD) method

Hiromi Yamashita¹, Yuki Miura¹, Kohsuke Mori¹, Sayoko Shironita¹, Yosuke Masui¹, Naoki Mimura¹, Tetsutaro Ohmichi¹, Takao Sakata² and Hirotaro Mori²

¹ Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
² Research Center for Ultra-High Voltage Electron Microscopy, Osaka University, 7-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan

Abstract: Using a photo-assisted deposition (PAD) method, nanosized Pd metal can be highly dispersed on Ti-containing silicalite zeolite (TS-1) under UV-light irradiation (PAD-Pd/TS-1). The nanosized Pd metal was deposited directly on the photo-excited tetrahedrally coordinated titanium oxide species (tetra-Ti-oxide) of TS-1 zeolite. Under the flow of H₂ and O₂ in water solvent, the efficient formation of H₂O₂ could be observed by the PAD-Pd/TS-1 catalyst under mild reaction conditions (ambient temperature and atmospheric pressure). Furthermore, the presence of phenol in this reaction system led to the formation of the products from the partial oxidation of phenol with the formed H₂O₂.