Three-Dimensional Atomic Distribution in a Bimetallic Nanoparticle Evaluated by an Iterative EXAFS Analysis

2015 Fiscal Year Final Research Report

• Project/Area Number: 26810127
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Inorganic industrial materials
• Research Institution: Toyota Central R&D Lab., Inc.
• Principal Investigator: Nishimura Yusaku 株式会社豊田中央研究所, 分析部 量子ビーム解析研究室, 研究員 (10581423)
• Research Collaborator: NAGAI Yasutaka ; HAMAGUCHI Tsuyoshi ; DOHMAE Kazuhiko ; NONAKA Takamasa ; TAKAGI Hideki ; YAMAGUCHI Satoshi ; KATO Akihiko ; HORIBUCHI Kayo ; SUZUKI Noritomo ; UYAMA Takeshi
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: X線吸収分光法 / 原子配置 / バイメタリックナノ微粒子 / 触媒 / オペランド分析

Outline of Final Research Achievements

Bimetallic nanoparticles (BNPs) are expected as heterogeneous catalysts due to their unique physicochemical properties. For development of BNP-based catalysts, it is crucial to understand relationships between catalytic properties and atomic-scale geometric and electronic structures in a BNP. Hence, this research focused on (i) development of a method for evaluating three-dimensional atomic distribution (3DAD) in a BNP based on X-ray absorption spectroscopy (XAS) and (ii) clarification of relationship between 3DAD and catalytic activity. For the former (i), an analysis method was developed to refine 3DAD in a BNP based on average coordination numbers for the first coordination shell estimated by XAS curve fitting analysis. For the latter (ii), an operando XAS study of catalytic C3H6 oxidation over equimolar Pd-Pt BNPs revealed that a Pd-core Pt-shell BNP exhibits higher activity than a Pd-Pt alloy BNP in a stoichiometric C3H6-O2 atmosphere at temperatures less than 573 K.

Free Research Field

放射光利用科学，材料物理化学