CO2 hydrogenation on multicomponent alloy catalysts

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K14465
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 27030:Catalyst and resource chemical process-related
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Kobayashi Yasukazu 国立研究開発法人産業技術総合研究所, エネルギー・環境領域, 主任研究員 (80735506)
• Project Period (FY): 2021-04-01 – 2023-03-31
• Keywords: 多成分系合金 / ナノ粒子 / 不均一系触媒 / 水素化反応 / 金属間化合物 / ハイエントロピー合金 / 溶融塩 / 水素化物

Outline of Final Research Achievements

In order to obtain alloy powders with high surface areas, we established an original synthesis method using CaH2 as a reducing agent in molten salt. The obtained alloy powders were Ni2TiAl, TiFe, FeAl, CrMnFeCoNi, AlCoCrFeNi(V), TiNiSi, CaPt2, YIr2, etc., and were confirmed to be alloys with a single crystal structure by XRD measurements. From the results of N2 adsorption experiments, it was confirmed that the BET surface area of these alloy powders is ~100m2/g, which is a relatively large surface area. Subsequently, the hydrogenation activity of the obtained alloy powders was evaluated in CO2 hydrogenation, CO hydrogenation, and liquid-phase organic synthesis reactions. As a result, compared with conventional supported catalysts, a decrease in activation energy and an improvement in activity (TOF) were observed, and thus unique characteristics of alloy catalysts were observed.

Free Research Field

触媒化学、材料化学

Academic Significance and Societal Importance of the Research Achievements

TiやAl, Yなどの酸化されやすい金属を含む合金の高表面積化は、チャレンジングな課題である。従来法においては、2000℃ほどの高温溶融混合後に急冷や室温付近での溶出処理によりナノ粒子や多孔質体を得る。本研究では、従来法とは異なり高温合成環境を必要とせず、溶融塩中でCaH2還元剤を用いることで酸化物前駆体の低温還元（600℃付近）により高表面積合金粉末を得る新規な合成手法を確立した。従来と異なるアプローチの可能性を示したことは学術的意義や社会的意義が高いと思われる。