Polymeric Carbon Nitride/Mesoporous Silica Composites as Catalyst Support for Au and Pt Nanoparticles

• Published in: Chemistry : a European journal Vol. 20; no. 10; pp. 2872 - 2878
• Main Authors: Xiao, Ping, Zhao, Yanxi, Wang, Tao, Zhan, Yingying, Wang, Huihu, Li, Jinlin, Thomas, Arne, Zhu, Junjiang
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 03.03.2014; WILEY‐VCH Verlag; Wiley Subscription Services, Inc
• Subjects: Carbon nitride; Catalysis; Catalysts; Chemistry; Gold; Gold - chemistry; heterogeneous catalysis; Metal Nanoparticles - chemistry; Nanoparticles; Nanoparticles - chemistry; Nitriles - chemistry; Oxidation; Oxidation-Reduction; Platinum; Platinum - chemistry; Polymers - chemistry; Silicates - chemistry; Silicon dioxide; Silicon Dioxide - chemistry; supported catalysts; oxidation; platinum; nanoparticles; heterogeneous catalysis; supported catalysts
• ISSN: 0947-6539; 1521-3765
• DOI: 10.1002/chem.201303741

Small and homogeneously dispersed Au and Pt nanoparticles (NPs) were prepared on polymeric carbon nitride (CNx)/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 CNx 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 CNx resulted in much smaller and better‐dispersed metal NPs. Furthermore, under catalytic conditions the CNx coating helps to stabilize the metal NPs. However, metal NPs on CNx/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 CNx support. Highly stable and dispersed Au and Pt nanoparticles (NPs) can be prepared by a facile impregnation method in which polymeric carbon nitride (CNx)/mesoporous silica composites are used as support, whereas agglomeration of NPs occurred in the absence of carbon nitride (see figure). The supported Pt NPs are promising catalysts for heterogeneous reactions such as CO oxidation.