期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 151, 期 -, 页码 195-200出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2011.10.037
关键词
Polysiloxane; Hybrid ceramic; Complexing agent; Pyrolysis; Catalyst
类别
资金
- German Research Foundation (DFG) [GR 953/21-2]
- Research Training Group 1375 Nonmetallic Porous Structures for Physical-Chemical Functions
Platinum containing hybrid ceramics were prepared by the pyrolytic conversion of a mixture of a methyl phenyl polysiloxane and platinic acid or a modified mixture containing in addition 3-aminopropyltriethoxysilane (APTE) as complexing agent in an atmosphere of nitrogen. Due to the moderate pyrolysis temperature of 500 degrees C microporous hybrid materials with high specific surface areas could be generated. By the addition of APTE the incorporation of the platinum as complexed metal ions led to well distributed metal nanoparticles. Furthermore, clustering or growth of particles could be suppressed during pyrolysis due to a stable embedding. By variation of metal loading and the ratio of APTE to Pt it was also possible to change the surface related properties of the microporous hybrids. Using CO oxidation as model reaction it could be shown that the addition of APTE as complexing agent is crucial to enhance the accessibility of the metal particles and the catalytic activity. (c) 2011 Elsevier Inc. All rights reserved.
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