Ingmar Gerlach - Academia.edu (original) (raw)
Papers by Ingmar Gerlach
Proceedings of Conference on Coal Science, 2003
Journal of Nanoparticle Research, 2008
Nanosized metal (oxides), which were immobilized on carbonaceous carriers, were prepared by hydro... more Nanosized metal (oxides), which were immobilized on carbonaceous carriers, were prepared by hydrolysis at very mild conditions by using the pores of the carrier material as a kind of nanoreactor. Metal alkoxide precursors were first adsorbed on the carrier material from the vapor phase and then exposed to water vapor to undergo hydrolysis reaction and form the product. With this facile method, titania, vanadia, rhodium (oxide) and platinum (oxide) nanostructures were prepared at high yields and high loadings on the carrier material. Metal (oxide) was well-dispersed in the carrier material. Extremely high number concentrations of spheroidal nanoparticles with a uniform size-distribution (ca. 5 nm in diameter) were obtained in case of using precursors with a low reactivity, whereas no such particles were formed from highly reactive precursors. However, with a subsequent calcination, such nanoparticles could be obtained even in the samples prepared from highly reactive precursors. This suggested that nanosized particles may be the thermodynamically stable form of the metal (oxide) 2 produced in the pores. With highly reactive precursors, supposedly metastable seeds for nanoparticles were formed. Upon subsequent exposure to heat, these could nucleate and restructure into nanosized, spheroidal particles. The hydrolysis of metal alkoxides within the pores of mesoporous materials and subsequent calcination thus gave the means to prepare nanosized metal (oxide) structures and to effectively control their size and shape.
Chemical Engineering Science, Sep 1, 2007
A unique "nano-reactor" concept was presented for producing nano-sized materials that cannot be p... more 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 tetraisopropoxide (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.
Microporous and Mesoporous Materials, 2009
A novel method for loading metal (oxide) nanoparticles on porous carrier materials at high yields... more A novel method for loading metal (oxide) nanoparticles on porous carrier materials at high yields was developed. Single-crystalline titania and rhodium nanoparticles were prepared within the mesopores of activated carbon which were used as a kind of nanoreactor. The precursor metal alkoxides were first adsorbed on the carrier. Product metal (oxide) was then formed within the pores of the activated
Journal of Chemical Engineering of Japan, 2008
... Ingmar GERLACH, Motoaki KAWASE and Kouichi MIURA Department of Chemical Engineering, Kyoto Un... more ... Ingmar GERLACH, Motoaki KAWASE and Kouichi MIURA Department of Chemical Engineering, Kyoto University, Kyotodaigaku-Katsura, Nishikyo-ku, Kyoto 615 ... In very small mesopores, Knudsen diffusion is the governing mass transport re-sistance, and therefore the effective ...
Microporous and Mesoporous Materials, 2009
A novel method for loading metal (oxide) nanoparticles on porous carrier materials at high yields... more A novel method for loading metal (oxide) nanoparticles on porous carrier materials at high yields was developed. Single-crystalline titania and rhodium nanoparticles were prepared within the mesopores of activated carbon which were used as a kind of nanoreactor. The precursor metal alkoxides were first adsorbed on the carrier. Product metal (oxide) was then formed within the pores of the activated
Journal of Nanoparticle Research, 2009
Immobilized nanosized metal (oxides) on carbonaceous carriers were prepared by hydrolysis under m... more Immobilized nanosized metal (oxides) on carbonaceous carriers were prepared by hydrolysis under mild conditions by using the carrier pores as a kind of nanoreactor. Metal alkoxide vapor was adsorbed on the carrier and then formed the product upon exposure to water vapor. With this facile method, Titania, Vanadia, Rhodium (oxide), and Platinum (oxide) nanostructures were prepared at high yields, high loadings, and good dispersion in the carrier material. High number concentrations of spheroidal nanoparticles of uniform size (diameter ca. 5 nm) were obtained from less reactive precursors, whereas with highly reactive precursors, such nanoparticles occurred only after subsequent calcination. Nanoparticles appeared to be the thermodynamically stable form of the metal (oxide) produced in the pores. Highly reactive precursors formed metastable seeds, which nucleated and restructured into nanoparticles upon subsequent exposure to heat. The presented method allows for preparation of metal (oxide) nanostructures and effective control of their size and shape.
JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 2008
... Ingmar GERLACH, Motoaki KAWASE and Kouichi MIURA Department of Chemical Engineering, Kyoto Un... more ... Ingmar GERLACH, Motoaki KAWASE and Kouichi MIURA Department of Chemical Engineering, Kyoto University, Kyotodaigaku-Katsura, Nishikyo-ku, Kyoto 615 ... In very small mesopores, Knudsen diffusion is the governing mass transport re-sistance, and therefore the effective ...
Industrial & Engineering Chemistry Research, 2005
Chemical Engineering Science, 2007
A unique "nano-reactor" concept was presented for producing nano-sized materials that cannot be p... more 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 tetraisopropoxide (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. ᭧
Proceedings of Conference on Coal Science, 2003
Journal of Nanoparticle Research, 2008
Nanosized metal (oxides), which were immobilized on carbonaceous carriers, were prepared by hydro... more Nanosized metal (oxides), which were immobilized on carbonaceous carriers, were prepared by hydrolysis at very mild conditions by using the pores of the carrier material as a kind of nanoreactor. Metal alkoxide precursors were first adsorbed on the carrier material from the vapor phase and then exposed to water vapor to undergo hydrolysis reaction and form the product. With this facile method, titania, vanadia, rhodium (oxide) and platinum (oxide) nanostructures were prepared at high yields and high loadings on the carrier material. Metal (oxide) was well-dispersed in the carrier material. Extremely high number concentrations of spheroidal nanoparticles with a uniform size-distribution (ca. 5 nm in diameter) were obtained in case of using precursors with a low reactivity, whereas no such particles were formed from highly reactive precursors. However, with a subsequent calcination, such nanoparticles could be obtained even in the samples prepared from highly reactive precursors. This suggested that nanosized particles may be the thermodynamically stable form of the metal (oxide) 2 produced in the pores. With highly reactive precursors, supposedly metastable seeds for nanoparticles were formed. Upon subsequent exposure to heat, these could nucleate and restructure into nanosized, spheroidal particles. The hydrolysis of metal alkoxides within the pores of mesoporous materials and subsequent calcination thus gave the means to prepare nanosized metal (oxide) structures and to effectively control their size and shape.
Chemical Engineering Science, Sep 1, 2007
A unique "nano-reactor" concept was presented for producing nano-sized materials that cannot be p... more 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 tetraisopropoxide (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.
Microporous and Mesoporous Materials, 2009
A novel method for loading metal (oxide) nanoparticles on porous carrier materials at high yields... more A novel method for loading metal (oxide) nanoparticles on porous carrier materials at high yields was developed. Single-crystalline titania and rhodium nanoparticles were prepared within the mesopores of activated carbon which were used as a kind of nanoreactor. The precursor metal alkoxides were first adsorbed on the carrier. Product metal (oxide) was then formed within the pores of the activated
Journal of Chemical Engineering of Japan, 2008
... Ingmar GERLACH, Motoaki KAWASE and Kouichi MIURA Department of Chemical Engineering, Kyoto Un... more ... Ingmar GERLACH, Motoaki KAWASE and Kouichi MIURA Department of Chemical Engineering, Kyoto University, Kyotodaigaku-Katsura, Nishikyo-ku, Kyoto 615 ... In very small mesopores, Knudsen diffusion is the governing mass transport re-sistance, and therefore the effective ...
Microporous and Mesoporous Materials, 2009
A novel method for loading metal (oxide) nanoparticles on porous carrier materials at high yields... more A novel method for loading metal (oxide) nanoparticles on porous carrier materials at high yields was developed. Single-crystalline titania and rhodium nanoparticles were prepared within the mesopores of activated carbon which were used as a kind of nanoreactor. The precursor metal alkoxides were first adsorbed on the carrier. Product metal (oxide) was then formed within the pores of the activated
Journal of Nanoparticle Research, 2009
Immobilized nanosized metal (oxides) on carbonaceous carriers were prepared by hydrolysis under m... more Immobilized nanosized metal (oxides) on carbonaceous carriers were prepared by hydrolysis under mild conditions by using the carrier pores as a kind of nanoreactor. Metal alkoxide vapor was adsorbed on the carrier and then formed the product upon exposure to water vapor. With this facile method, Titania, Vanadia, Rhodium (oxide), and Platinum (oxide) nanostructures were prepared at high yields, high loadings, and good dispersion in the carrier material. High number concentrations of spheroidal nanoparticles of uniform size (diameter ca. 5 nm) were obtained from less reactive precursors, whereas with highly reactive precursors, such nanoparticles occurred only after subsequent calcination. Nanoparticles appeared to be the thermodynamically stable form of the metal (oxide) produced in the pores. Highly reactive precursors formed metastable seeds, which nucleated and restructured into nanoparticles upon subsequent exposure to heat. The presented method allows for preparation of metal (oxide) nanostructures and effective control of their size and shape.
JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, 2008
... Ingmar GERLACH, Motoaki KAWASE and Kouichi MIURA Department of Chemical Engineering, Kyoto Un... more ... Ingmar GERLACH, Motoaki KAWASE and Kouichi MIURA Department of Chemical Engineering, Kyoto University, Kyotodaigaku-Katsura, Nishikyo-ku, Kyoto 615 ... In very small mesopores, Knudsen diffusion is the governing mass transport re-sistance, and therefore the effective ...
Industrial & Engineering Chemistry Research, 2005
Chemical Engineering Science, 2007
A unique "nano-reactor" concept was presented for producing nano-sized materials that cannot be p... more 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 tetraisopropoxide (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. ᭧