Development of high recovery and selective rare metal recovery polymer and its application to a catalyst for effective conversion of methane

2019 Fiscal Year Final Research Report

• Project/Area Number: 17K05946
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Green/Environmental chemistry
• Research Institution: University of Shizuoka (2019); Gunma University (2017-2018)
• Principal Investigator: Nagai Daisuke 静岡県立大学, 食品栄養科学部, 准教授 (30375323)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: 白金族分離 / 種核成長法 / ポリマー / 有機合成触媒 / 不均一系触媒 / 溝呂木-Heck反応

Outline of Final Research Achievements

Mutual separation of platinum group metals (PGMs) based on seed-mediated growth on the polymer with metal-coordination unit (thiocarbonyl group) was investigated. Nucleation of Pt(IV) ions by sodium borohydride produced the Pt(0) seeds on the thiocarbonyl sulfurs of the polymers. The nucleated polymer was added into the growth solution containing Pt(IV) and othe PGM ions, followed by reduction by L-ascorbic acid assembled similar crystalline platinums to attach Pt nanoparticles. This approach has advantage, i.e., the selection of the metal seeds can separate various objective metals. Therefore, we could separate Pd selectively by attaching Pd(0) seeds on the thiocarbonyl sulfurs of the polymers.
Further, the polymer adsorbing Pd(II) ions was applied to the organomettalic catalyst for Mizoroki-Heck cross-coupling reaction. Turnover number of the polymer is extremely high (3,333,333), which is greter than any other catalysts reported in the literature.

Free Research Field

有価物回収

Academic Significance and Societal Importance of the Research Achievements

本研究により、これまでは困難であった白金族同士の分離法を開発できれば、都市鉱山および白金鉱石に含まれる白金族同士の分離に応用でき、社会的意義は非常に高いものと考えられる。さらに、白金族を吸着したポリマーを有機合成触媒に応用することにより、レアメタルを消費することなく有用物質の生産が可能になり、新規な資源循環型社会の構築が期待される。