Development of high-surface-area perovskite-type oxides for ammonia decomposition catalysts

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K05584
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 34030:Green sustainable chemistry and environmental chemistry-related
• Research Institution: Kyoto University
• Principal Investigator: Muroyama Hiroki 京都大学, 工学研究科, 講師 (40542105)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: ペロブスカイト型酸化物 / ナノ粒子 / アンモニア分解

Outline of Final Research Achievements

In this study, we aimed to synthesize perovskite-type oxides with more than 200 m2 g-1 of surface area and apply them as supports for Ni catalysts. BaTiO3-supported Ni catalysts with ca. 200 m2 g-1 were prepared via the formations of colloid and gel of BaTiO3 and Ni species. The prepared catalysts showed higher ammonia decomposition activity in the low temperature range compared with the catalyst prepared by the conventional method. On the other hand, the agglomeration of catalysts prevented Ni particles from exposure to supplied ammonia, resulting in the suppression of the enhancement of NH3 conversion at high temperatures. In addition, an elution of the Ba component from BaTiO3 during the preparation process was confirmed. Improvements of the preparation method would resolve these issues.

Free Research Field

触媒化学

Academic Significance and Societal Importance of the Research Achievements

本研究では、従来の方法では調製困難であった高表面積を有するペロブスカイト型酸化物担持Ni触媒を調製した。これまで高表面積な酸化物材料はAl2O3やSiO2、ゼオライトなどに限られていたが、ペロブスカイト型酸化物などの複合酸化物にまで拡張できれば、様々な反応を促進する触媒材料の開発につながる。その結果、化学物質の合成における省エネルギー・省資源化の達成だけでなく、複合酸化物の調製方法の新しい展開も期待される。