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Catalytic three dimensional aerogels having mesoporous nanoarchitecture
Catalytic three dimensional aerogels having mesoporous nanoarchitecture
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机译:具有介孔纳米结构的催化三维气凝胶
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摘要
Gold-titania (Au—TiO2) composite aerogels and ambigles were synthesized, characterized, and tested as ambient temperature catalysts for carbon monoxide. Adding alkanethiolate-monolayers-protected gold clusters (with ˜2 nm Au cores) directly to titania sol before gelation yields uniformly dispersed guests in the composite aerogel. The Au guests aggregate to 5 to 10 nm upon calcination to remove alkanethiolate and crystallize amorphous titania to anatase. The resulting composite aerogel exhibits high catalytic activity toward CO oxidation at room temperature at Au particle sizes that are essentially inactive in prior Au—TiO2 catalysts. Transmission electron microscopy illustrates the three-dimensional nature of the catalytic nanoarchitecture in which gold guests contact multiple anatase nanocrystallites.
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机译:合成,表征和测试了金-二氧化钛(Au-TiO 2 Sub>)复合气凝胶和歧化剂,并作为环境温度的一氧化碳催化剂进行了测试。在胶凝之前,将链烷硫醇单分子保护的金簇(具有〜2 nm Au核)直接添加到二氧化钛溶胶中,从而在复合气凝胶中产生均匀分散的客体。煅烧后,Au客体聚集至5至10 nm,以去除链烷硫醇盐并将无定形二氧化钛结晶为锐钛矿。所得的复合气凝胶在室温下在Au粒径下对CO氧化表现出高催化活性,而Au TiO 2 Sub>催化剂中基本上没有活性。透射电子显微镜显示了催化纳米结构的三维性质,其中金客人接触多个锐钛矿纳米晶体。
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