| Project/Area Number |
11440180
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical chemistry
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| Research Institution | High energy accelerator research organization |
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Principal Investigator |
NOMURA Masaharu Institute of materials structure science, Professor, 物質構造科学研究所, 教授 (70156230)
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| Co-Investigator(Kenkyū-buntansha) |
IWASAWA Yasuhiro Department of Chemistry, Graduate School of Science, the University of Tokyo, Professor, 大学院・理学系研究科, 教授 (40018015)
ASAKURA Kiyotaka Catalysis research center, Hokkaido University, Professor, 触媒化学研究センター, 教授 (60175164)
MATSUSHITA Tadashi Institute of materials structure science, Professor, vise president, 物質構造科学研究所, 教授、副所長 (40092332)
INADA Yasuhiro Research Center for Materials Science, Nagoya University, research Associate, 物質科学国際研究センター, 助手 (60242814)
FUNAHASHI Shigenobu Department of Chemistry, Graduate School of Science, Nagoya University, Professor, 大学院・理学研究科, 教授 (30022700)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥5,600,000 (Direct Cost: ¥5,600,000)
Fiscal Year 2000: ¥5,600,000 (Direct Cost: ¥5,600,000)
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| Keywords | dispersive XAFS / time-resolved XAFS / Cu0ZSM-5 catqalyst / catalysis |
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| Research Abstract |
A compact mirror bender and a mirror, which can be installed in a dispersive XAFS experimental system, were developed. The mirror system is used to focus the beam vertically and reduce the higher order content. Triangular polychomator crystals and the bender system for it was used at first, but a new rectangular polychromator crystal and a bender to realize elliptical shape is newly developed in order to achieve smaller focus size at the sample position. The focus sizes were evaluated. A coupling optics system to meet the requirement of kinetics mode of a CCD detector is also developed.
Cu-ZSM-5 catalyst is well known that it has unique catalytic property for NO decomposition and its activity is related to the redox reaction of copper species. The time resolved reduction process of copper cations in ZSM-5 during temperature-programmed reduction (300-700K) was studied by using the energy-dispersive XAFS system developed in this research with 1 sec. time-resolution. The isolated Cu^<2+> species in the channel were reduced stepwise. They were reduced to isolated Cu^+ species at 400-450 K, then to Cu^0 metallic clusters at 550-650K.Small clusters like Cu_4 were initially formed, followed by particle growth. A small part of them went out to the outer surfaces of ZSM-5 during the reduction.
Preliminary experiment of solution reaction by using sropped-flow apparatus was also carried out. It is confirmed that fairly high quality data can be obtained by using the system developed in this research.
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