title: A Synthetic Pseudo-Rh: NOx Reduction Activity and Electronic Structure of Pd-Ru Solid-solution Alloy Nanoparticles.
abstract: Rh is one of the most important noble metals for industrial applications. A major fraction of Rh is used as a catalyst for emission control in automotive catalytic converters because of its unparalleled activity toward NOx reduction. However, Rh is a rare and extremely expensive element; thus, the development of Rh alternative composed of abundant elements is desirable. Pd and Ru are located at the right and left of Rh in the periodic table, respectively, nevertheless this combination of elements is immiscible in the bulk state. Here, we report a Pd-Ru solid-solution-alloy nanoparticle (PdxRu1-x NP) catalyst exhibiting better NOx reduction activity than Rh. Theoretical calculations show that the electronic structure of Pd0.5Ru0.5 is similar to that of Rh, indicating that Pd0.5Ru0.5 can be regarded as a pseudo-Rh. Pd0.5Ru0.5 exhibits better activity than natural Rh, which implies promising applications not only for exhaust-gas cleaning but also for various chemical reactions.
authors.affiliation: Elements Strategy Initiative for Catalysts and Batteries, Kyoto University, 1-30 Goryo-Ohara, Nishikyo-ku, Kyoto 615-8245, Japan.|Department of Applied Chemistry, Faculty of Engineering, Oita University, 700 Dannoharu, Oita 870-1192, Japan.
authors.forename: Katsutoshi
authors.initials: K
authors.lastname: Sato
authors.affiliation: Department of Applied Chemistry, Faculty of Engineering, Oita University, 700 Dannoharu, Oita 870-1192, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Tomonaga
authors.affiliation: Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, Motooka 744, Nishi-ku, Fukuoka 819-0395, Japan.
authors.forename: Tomokazu
authors.initials: T
authors.lastname: Yamamoto
authors.affiliation: Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, Motooka 744, Nishi-ku, Fukuoka 819-0395, Japan.|INAMORI Frontier Research Center, Kyushu University, Motooka 744, Nishi-ku, Fukuoka, 819-0395, Japan.
authors.forename: Syo
authors.initials: S
authors.lastname: Matsumura
authors.affiliation: Department of Hydrogen Energy Systems, Kyushu University, Motooka 744, Nishi-ku, Fukuoka 819-0395, Japan.
authors.forename: Nor Diana Binti
authors.initials: ND
authors.lastname: Zulkifli
authors.affiliation: INAMORI Frontier Research Center, Kyushu University, Motooka 744, Nishi-ku, Fukuoka, 819-0395, Japan.
authors.forename: Takayoshi
authors.initials: T
authors.lastname: Ishimoto
authors.affiliation: INAMORI Frontier Research Center, Kyushu University, Motooka 744, Nishi-ku, Fukuoka, 819-0395, Japan.|Department of Hydrogen Energy Systems, Kyushu University, Motooka 744, Nishi-ku, Fukuoka 819-0395, Japan.
authors.forename: Michihisa
authors.initials: M
authors.lastname: Koyama
authors.affiliation: Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan.
authors.forename: Kohei
authors.initials: K
authors.lastname: Kusada
authors.affiliation: Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan.
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Kobayashi
authors.affiliation: INAMORI Frontier Research Center, Kyushu University, Motooka 744, Nishi-ku, Fukuoka, 819-0395, Japan.|Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kitagawa
authors.affiliation: Department of Applied Chemistry, Faculty of Engineering, Oita University, 700 Dannoharu, Oita 870-1192, Japan.
authors.forename: Katsutoshi
authors.initials: K
authors.lastname: Nagaoka