Nano-reactor for producing high performance nanomaterials

A unique “nano-reactor” concept was presented for producing nano-sized materials that cannot be produced in a macro-reactor. The concept utilizes nano-space of porous materials such as activated carbon and activated alumina as a kind of “nano-reactor”. The reactant adsorbed in the nano-space was sub...

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Bibliographic Details
Published in:Chemical engineering science 2007-09, Vol.62 (18), p.5655-5660
Main Authors: Miura, Kouichi, Kawase, Motoaki, Ashida, Ryuichi, Gerlach, Ingmar, Yamamoto, Taisuke
Format: Article
Language:English
Subjects:
[formula omitted] particle
Applied sciences
Chemical engineering
Exact sciences and technology
Nano-reactor
Nano-structure
Particle formation
Porous media
Reactors
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Summary:A unique “nano-reactor” concept was presented for producing nano-sized materials that cannot be produced in a macro-reactor. The concept utilizes nano-space of porous materials such as activated carbon and activated alumina as a kind of “nano-reactor”. The reactant adsorbed in the nano-space was subjected to reaction in such a manner that most of reaction will be completed in the nano-space. The validity of this concept was examined by utilizing two pyrolysis reactions forming carbon and TiO 2 from volatile compounds. The rapid heating as large as 3000 K/s and a high pressure of 2 MPa were employed as the means to complete the pyrolysis reaction within the nano-space. The carbon yield reached as high as 0.89 when anthracene adsorbed on an activated carbon was pyrolyzed, and the TiO 2 yield reached a value as high as 0.60 when TTIP adsorbed on the activated carbon was pyrolyzed. The carbon produced by this nano-reactor was a nano-graphite consisting of 2–3 graphene layers of less than 2 nm in diameter, and TiO 2 produced were fine particles of 5–8 nm in diameter. Such products were significantly different from those that are obtained when the same reactions were carried out in the bulk phase. Thus the “nano-reactor” concept was validated.
ISSN:0009-2509
1873-4405
DOI:10.1016/j.ces.2007.03.014