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The Evolution of Gold Nanoparticles in the Presence of Configurational Ion Cu 2+ of Hydrotalcites Supports
Author(s) -
Liu Na,
Liu Dan,
Tang Tian,
Dong Wensheng,
Liu Chunling,
Xu Chunli
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201800358
Subject(s) - nanoparticle , benzaldehyde , hydrotalcite , colloidal gold , benzyl alcohol , redistribution (election) , catalysis , ion , materials science , ion exchange , redox , chemical engineering , chemistry , inorganic chemistry , nanotechnology , organic chemistry , engineering , politics , political science , law
Controlled synthesis of gold nanoparticles had attracted much attention in catalysis. The evolution of gold nanoparticles by impregnation was investigated in the presence of configurational ion Cu 2+ of hydrotalcites supports. The formation of Au nanoparticles experienced two steps. In the drying step, part of Au ions was reduced by H 2 O. The reducing extents of Au ions and the dispersion of Au nanoparticles were affected by configurational ion Cu 2+ in the hydrotalcites supports. In the reduction step, all the residue Au ions were reduced by H 2 and the Au nanoparticles formed in the previous step was redistributed. Both the redistribution of Au nanoparticles formed in the previous step and the distribution of Au nanoparticles formed in the second step was affected by the surface reaction between Au on the surface of supports and Cu embedded in the supports. The surface reaction controlled the dispersion of Au nanoparticles. The size of gold nanoparticles was 2.7 nm, which showed high activity in benzyl alcohol oxidation with benzaldehyde yield of 95%.