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Polymeric Carbon Nitride/Mesoporous Silica Composites as Catalyst Support for Au and Pt Nanoparticles
Author(s) -
Xiao Ping,
Zhao Yanxi,
Wang Tao,
Zhan Yingying,
Wang Huihu,
Li Jinlin,
Thomas Arne,
Zhu Junjiang
Publication year - 2014
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.201303741
Subject(s) - materials science , catalysis , mesoporous material , nanoparticle , metal , mesoporous silica , coating , chemical engineering , nitride , carbon fibers , condensation , composite material , graphitic carbon nitride , nanotechnology , layer (electronics) , chemistry , composite number , organic chemistry , metallurgy , photocatalysis , engineering , physics , thermodynamics
Small and homogeneously dispersed Au and Pt nanoparticles (NPs) were prepared on polymeric carbon nitride (CN x )/mesoporous silica (SBA‐15) composites, which were synthesized by thermal polycondensation of dicyandiamide‐impregnated preformed SBA‐15. By changing the condensation temperature, the degree of condensation and the loading of CN x can be controlled to give adjustable particle sizes of the Pt and Au NPs subsequently formed on the composites. In contrast to the pure SBA‐15 support, coating of SBA‐15 with polymeric CN x resulted in much smaller and better‐dispersed metal NPs. Furthermore, under catalytic conditions the CN x coating helps to stabilize the metal NPs. However, metal NPs on CN x /SBA‐15 can show very different catalytic behaviors in, for example, the CO oxidation reaction. Whereas the Pt NPs already show full CO conversion at 160 °C, the catalytic activity of Au NPs seems to be inhibited by the CN x support.