催化作用
锰
纳米颗粒
离子液体
氧化态
化学
产量(工程)
金属
胶体
无机化学
化学工程
材料科学
有机化学
纳米技术
冶金
工程类
作者
Johannes Zenner,Kelly Tran,Liqun Kang,Niklas W. Kinzel,Christophe Werlé,Serena DeBeer,Alexis Bordet,Walter Leitner
标识
DOI:10.1002/chem.202304228
摘要
Colloidal and supported manganese nanoparticles were synthesized following an organometallic approach and applied in the catalytic transfer hydrogenation (CTH) of aldehydes and ketones. Reaction parameters for the preparation of colloidal nanoparticles (NPs) were optimized to yield small (2-2.5 nm) and well-dispersed NPs. Manganese NPs were further immobilized on an imidazolium-based supported ionic phase (SILP) and characterized to evaluate NP size, metal loading, and oxidation states. Oxidation of the Mn NPs by the support was observed resulting in an average formal oxidation state of +2.5. The MnOx @SILP material showed promising performance in the CTH of aldehydes and ketones using 2-propanol as a hydrogen donor, outperforming previously reported Mn NPs-based CTH catalysts in terms of metal loading-normalized turnover numbers. Interestingly, MnOx @SILP were found to lose activity upon air exposure, which correlates with an additional increase in the average oxidation state of Mn as revealed by X-ray absorption spectroscopic studies.
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