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Mechanochemical Synthesis of Ruthenium Cluster@Ordered Mesoporous Carbon Catalysts by Synergetic Dual Templates
Author(s) -
Wang Li,
Zhao Jiahua,
Zhang Pengfei,
Yang Shize,
Zhan Wangcheng,
Dai Sheng
Publication year - 2019
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201901714
Subject(s) - catalysis , ruthenium , mesoporous material , carbon fibers , benzyl alcohol , chemistry , materials science , micelle , chemical engineering , inorganic chemistry , organic chemistry , composite number , aqueous solution , engineering , composite material
Abstract Ruthenium (Ru)@Ordered mesoporous carbon (OMC) is a key catalyst in fine‐chemical production. In general, the OMC support is prepared by a wet self‐assembly requiring excessive solvent, toxic phenol–aldehyde precursors and a long reaction time, followed by post‐immobilization to load Ru species. Herein, we wish to report a solid‐state, rapid, and green strategy for the synthesis of Ru@OMC with biomass tannin as the precursor. The chemistry essence of this strategy lies in the mechanical‐force‐driven assembly, during which tannin‐metal (Zn 2+ and Ru 3+ ) coordination polymerization and hydrogen‐bonding interactions between tannin‐block copolymer (PEO‐PPO‐PEO, F127) simultaneously occur. After thermal treatment, Ru@OMC catalysts with mesoporous channels, narrow pore‐size distribution (≈7 nm), and high surface area (up to 779 m 2 g −1 ) were directed by F127 micelles. Meanwhile, the Zn 2+ ions dilute Ru 3+ and avoid the sintering of Ru species, resulting in Ru clusters around 1.4–1.7 nm during carbonization (800 °C). Moreover, the Ru@OMC catalyst afforded a good activity (TOF: up to 4170 h −1 ) in the selective oxidation of benzyl alcohol to benzaldehyde by molecular oxygen.