期刊文献+
共找到1篇文章
< 1 >
每页显示 20 50 100
Highly selective/enantioselective Pt-ReOx/C catalyst for hydrogenation of L-malic acid at mild conditions
1
作者 Bair S.Bal'zhinimaev eugene a.paukshtis +1 位作者 Alexey P.Suknev Nikita V.Makolkin 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2018年第3期903-912,共10页
The catalyst preparation strategy was based on a strict introduction sequence of rhenium and platinum precursors and their strong interaction with carbon support resulted in the formation of 0.5 nm Pt-Re Ox species of... The catalyst preparation strategy was based on a strict introduction sequence of rhenium and platinum precursors and their strong interaction with carbon support resulted in the formation of 0.5 nm Pt-Re Ox species of atomic dispersion, where platinum is metallic, while monolayer rhenium is partially oxidized(Re2+). The reaction kinetics was studied taking into account the process of L-malic acid association leading to the formation of inactive cyclic oligomeric species. High TOFs(ca. 50 h-1), selectivities(ca. 99%)and stability of Pt-Re Ox/C catalysts in aqueous-phase hydrogenation of L-malic acid, which are close to those of the homogeneous pincer type complexes, were revealed at mild conditions(T = 90–130 ℃). Taking into account that(i) hydrogenation reaction occurred 2–3 orders of magnitude faster than its racemization and(ii) association of L-malic acid dominates at low temperatures and in a concentrated solution,special reaction conditions that allow obtaining chemically and optically(ee 〉 99%) pure(S)-3-hydroxy-γ-butyrolactone and(S)-1,2,4-butanetriol were found. Basing on HAADF-STEM, EDX, XPS, and kinetic studies, the structure of active species and basic reaction pathways are proposed. 展开更多
关键词 L-malic acid Hydrogenation Enantioselectivity Platinum Rhenium Atomic dispersion
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部