Abstract: 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-ReOx 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-ReOx/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 °C). 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.

Cite: Bal'zhinimaev B.S. , Paukshtis E.A. , Suknev A.P. , Makolkin N.V.
Highly Selective/Enantioselective Pt-ReOx/C Catalyst for Hydrogenation of L-Malic Acid at Mild Conditions
Journal of Energy Chemistry. 2018. V.27. N3. P.903-912. DOI: 10.1016/j.jechem.2017.07.018 WOS Scopus РИНЦ OpenAlex

Dates:

Submitted:	Apr 25, 2017
Accepted:	Jul 27, 2017
Published online:	Jul 31, 2017
Published print:	May 1, 2018

Identifiers:

Web of science:	WOS:000430515900033
Scopus:	2-s2.0-85026817639
Elibrary:	35504215
OpenAlex:	W2742136193

Citing:

DB	Citing
Web of science	10
Scopus	10
OpenAlex	13

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