Nanostructure control of metal oxide catalyst supports using precursor atomic arrangement and their catalytic properties

2021 Fiscal Year Final Research Report

• Project/Area Number: 20K15051
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 26040:Structural materials and functional materials-related
• Research Institution: University of Hyogo
• Principal Investigator: NOZAKI Ai 兵庫県立大学, 工学研究科, 准教授 (60795516)
• Project Period (FY): 2020-04-01 – 2022-03-31
• Keywords: アモルファス合金 / 金属酸化物 / 触媒担体

Outline of Final Research Achievements

The effect of the atomic arrangement of the precursor alloys on the morphology and catalytic properties of the metal oxides was investigated by using the atomic arrangement of the precursor alloys. It was found that the morphology and surface area of CeO2, obtained by selectively leaching Al after heat treatment to Ce-Al amorphous alloys, could be controlled by changing the heat treatment conditions and chemical treatment conditions to the precursor. Furthermore, it showed superior catalyst support properties compared to CeO2 prepared from cerium hydroxide and cerium carbonate. The use of prepared CeO2 as a support successfully increased the efficiency of the catalytic reaction. Also, iron oxide prepared from Fe-Al crystal alloys also exhibited higher catalytic activity than commercially available iron oxides.

Free Research Field

触媒材料

Academic Significance and Societal Importance of the Research Achievements

アモルファス合金は熱的に不安定であり，加熱により原子配列が変化しいずれ結晶化する．このような結晶化過程にある原子配列の異なる合金から１成分を溶出して得た多孔質金属酸化物について，前駆体原子配列と金属酸化物形状や触媒特性の関連性は未解明の課題である．本研究課題を通して，前駆体Ce-Al合金の構造と調製されるCeO2の形状との関係性を明らかにするとともに新規金属酸化物を担体とする触媒開発を行った．本研究で作製した金属酸化物を担体とすることで担持する金属のサイズ・構造を効果的に改善できた．