title: Revealing the heterogeneous contamination process in metal nanoparticulate catalysts in CO gas without purification by in situ environmental transmission electron microscopy.
abstract: It is known that samples become contaminated in CO gas of high pressure unless care is taken with the gas supply line to an environmental transmission electron microscope. This technical note reveals the heterogeneous formation process of contamination in situ on a nanoparticulate catalyst sample. It is shown that the surface of metal nanoparticles is preferentially contaminated, while the surface of metal oxide supports remains uncontaminated. It is also demonstrated that the contamination is suppressed by introducing a gas purifier in a gas supply line.
authors.affiliation: The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan.|Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 yamadaoka, Suita, Osaka 565-0871, Japan.|Technical Research & Development Bureau, Nippon Steel & Sumitomo Metal Corporation, 1-8 Fuso-Cho, Amagasaki, Hyogo 660-0891, Japan.
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Uchiyama
authors.affiliation: The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan.
authors.forename: Hideto
authors.initials: H
authors.lastname: Yoshida
authors.affiliation: The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan kamiuchi@sanken.osaka-u.ac.jp.
authors.forename: Naoto
authors.initials: N
authors.lastname: Kamiuchi
authors.affiliation: School of Environmental Science and Engineering, Kochi University of Technology, Kami, Kochi 78208502, Japan.
authors.forename: Hideo
authors.initials: H
authors.lastname: Kohno
authors.affiliation: The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan.
authors.forename: Seiji
authors.initials: S
authors.lastname: Takeda
keywords: CO; contamination; corrosion products; environmental transmission electron microscopy; gas purifier; gold catalysts