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Synthesis and Tuning of Gold Nanoparticles Supported on Polymorphic Semicrystalline Nanoporous Polymer for Catalytic Aerobic Oxidation of Alcohols
Author(s) -
Buonerba Antonio,
Canton Patrizia,
Capacchione Carmine,
Grassi Alfonso
Publication year - 2022
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.202200466
Subject(s) - nanoporous , crystallinity , polystyrene , polymer , chemical engineering , catalysis , colloidal gold , nanoparticle , chemistry , solvent , annealing (glass) , polymer chemistry , alcohol oxidation , chloroform , materials science , nanotechnology , organic chemistry , composite material , engineering
The wide and complex tunability of gold nanoparticles (AuNPs) supported on nanoporous, semicrystalline, and polymorphic polymer matrices consisting of syndiotactic polystyrene (sPS) or multiblock syndiotactic polystyrene‐ co ‐ cis ‐1,4 poly(butadiene) (sPSB) is herein described and correlated with the performances in aerobic oxidation of (±)‐1‐phenylethanol. Impregnation or deposition‐impregnation synthetic methods yielded AuNPs of middle size (10–20 nm) on the surface of polymer grains. The co‐precipitation method leads to small AuNPs (4–5 nm) homogenously dispersed in the support with quantitative entrapment of the gold. Thermal or solvent annealing afforded modifications of polymer crystalline phase and AuNPs morphology. The annealing with chloroform/water mixture increases the crystallinity of the nanoporous forms and converts compact γ and β phases into the nanoporous ϵ and δ phases. The thermal treatment of the AuNPs‐sPS(B) catalysts afford defective NPs with enhanced catalytic activity. The solvent‐induced formation of the nanoporous forms improves permeability to solvents and reactants and, in turn, the catalytic properties.