摘要
Thiolate-protected Au nanoclusters(or thiolated Au NCs) are very promising catalysts due to their well-defined cluster size(atomic precision) and structure(atomically resolved).So thiolated Au NCs provide an ideal platform to reveal certain fundamental issues related to Au-based catalytic reactions.In this study,6-mercaptohexanoic(MHA) protected Au25(MHA)18 nanoclusters(or thiolated Au NCs) deposited on various inorganic supports,including hydroxyapatite(HAP),TiO_2(Degussa P25),activated carbon(AC),pyrolyzed graphene oxide(PGO),and fumed SiO_2 were prepared via a conventional impregnation method.Following that,calcination under a N2 stream was conducted to produce surface ligand-free,highly dispersed Au NCs catalysts.The effects of supports on the size and catalytic activity of Au NCs were systematically investigated.Both the size effect and metal–support interaction are crucial for the design of supported Au NCs as efficient catalysts for targeted reactions.
Thiolate-protected Au nanoclusters(or thiolated Au NCs) are very promising catalysts due to their well-defined cluster size(atomic precision) and structure(atomically resolved).So thiolated Au NCs provide an ideal platform to reveal certain fundamental issues related to Au-based catalytic reactions.In this study,6-mercaptohexanoic(MHA) protected Au25(MHA)18 nanoclusters(or thiolated Au NCs) deposited on various inorganic supports,including hydroxyapatite(HAP),TiO_2(Degussa P25),activated carbon(AC),pyrolyzed graphene oxide(PGO),and fumed SiO_2 were prepared via a conventional impregnation method.Following that,calcination under a N2 stream was conducted to produce surface ligand-free,highly dispersed Au NCs catalysts.The effects of supports on the size and catalytic activity of Au NCs were systematically investigated.Both the size effect and metal–support interaction are crucial for the design of supported Au NCs as efficient catalysts for targeted reactions.
引文
[1]Fang,J.;Xie,J.P.;Yan,N.et al.Nanoscale 2015,7:6325.
[2]Li,G.;Jin,R.C.Acc.Chem.Res.2013,46,1749.
[3]Yamazoe,S.;Koyasu,K.;Tsukuda,T.Acc.Chem.Res.2014,47:816.