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Selective Aerobic Oxidation of Alcohols over Gold‐Palladium Alloy Catalysts Using Air at Atmospheric Pressure in Water
Author(s) -
Zhang Wei,
Xiao Ziqiang,
Wang Jiajun,
Fu Wenqin,
Tan Rong,
Yin Donghong
Publication year - 2019
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201900015
Subject(s) - bimetallic strip , catalysis , palladium , alloy , metal , atmospheric pressure , chemistry , dispersion (optics) , nanoparticle , inorganic chemistry , transition metal , materials science , nuclear chemistry , organic chemistry , nanotechnology , oceanography , physics , optics , geology
A series of bimetallic Au−Pd alloy nanoparticles (NPs) with varied Au/Pd molar ratios was supported on Gamma‐alumina (γ‐Al 2 O 3 ) surface through the co‐impregnation‐reduction method using HAuCl 4 and PdCl 2 as metal precursors. Characterization results suggested the high dispersion of Au−Pd alloy NPs, as well as the interplay between the two compositions. Benefitting from the synergistic effects of Au−Pd alloying, the bimetallic Au‐Pd x @γ‐Al 2 O 3 catalysts were highly efficient for selective aerobic oxidation of various alcohols either aromatic or aliphatic in water using air at atmospheric pressure as a sole oxidant without the need for any cocatalyst. Quantitative yields of corresponding aldehydes or ketones were achieved over Au‐Pd 1.2 @γ‐Al 2 O 3 within 2 h, whereas pure Au@γ‐Al 2 O 3 or Pd@γ‐Al 2 O 3 was far less efficient. More importantly, the “alloying effect” appeared to stabilize the bimetallic NPs against aggregation and poisoning, which made the Au‐Pd x @γ‐Al 2 O 3 more stable and reusable in the aerobic oxidation of alcohols.