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Supported Co–Re Bimetallic Catalysts with Different Structures as Efficient Catalysts for Hydrogenation of Citral
Author(s) -
Di Xin,
Lafaye Gwendoline,
Especel Catherine,
Epron Florence,
Qi Ji,
Li Chuang,
Liang Changhai
Publication year - 2019
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201802744
Subject(s) - bimetallic strip , catalysis , dehydrogenation , redox , citral , chemistry , desorption , inorganic chemistry , cobaltocene , transition metal , cyclohexane , materials science , chemical engineering , adsorption , organic chemistry , chromatography , ferrocene , electrode , essential oil , electrochemistry , engineering
Bimetallic Co–Re/TiO 2 catalysts were developed for efficient citral hydrogenation. Bimetallic catalysts were prepared by co‐impregnation (CI), successive‐impregnation (SI), and surface redox method (SR). The arrangement between the Co and Re species on these systems was fully characterized using several techniques (TEM–energy‐dispersive X‐ray spectroscopy, H 2 temperature‐programmed reduction, temperature‐programmed desorption, XRD, CO FTIR spectroscopy, model reaction of cyclohexane dehydrogenation), and their catalytic performances were evaluated for the selective hydrogenation of citral towards unsaturated alcohols. The Re and Co species are completely isolated in the CI sample, presenting a very limited Co–Re interaction. In SI samples, the metals coexist in a Janus‐type structure with a concentration of Re around Co. Decoration/core–shell structures are observed for SR samples resulting from the redox exchange between the metallic surface of the parent Co/TiO 2 catalyst and the Re 7+ species of the modifier precursor salt. The contact degree between the two metals gradually increases as follows: Isolated structure (CI)