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Kawagoe, Japan

Danjo Y.,Saitama University | Kikuchi I.,Saitama University | Ino Y.,Kawaken Fine Chemicals Co | Ohshima M.-A.,Saitama University | And 2 more authors.
Reaction Kinetics, Mechanisms and Catalysis | Year: 2012

In order to examine the capability of AlPO4 to serve as a catalytic support, we analyzed naphthalene hydrogenation over Pd/AlPO 4 catalyst in the presence of CO. This process is an effective storage strategy in the organic hydride method that uses low grade hydrogen. Pd/AlPO4 demonstrated high activity in naphthalene hydrogenation similar to Pd/SiO2-Al2O3, and retained the activity in much higher extent in the presence of CO as compared to Pd/Al 2O3. The existence of acidic sites on the surface of AlPO4 was confirmed by ammonia adsorption. FT- IR analysis of adsorbed CO after high temperature evacuation revealed that CO desorbed more easily on Pd surface when supported on acidic materials. Detailed analysis of the IR spectra suggested that acidic support decreased the electronic density of Pd and weakened the adsorption bond. Because CO retardation decreased on acidic supports, Pd catalysts demonstrated high activity in the presence of CO. We found that AlPO4 was an effective acidic support for Pd catalyzed hydrogenation. © Akadémiai Kiadó , Budapest, Hungary 2011. Source


Zhao Z.-G.,Japan National Institute of Advanced Industrial Science and Technology | Zhao Z.-G.,CAS Suzhou Institute of Nano Technology and Nano Bionics | Kodaira T.,Japan National Institute of Advanced Industrial Science and Technology | Nagai N.,Kawaken Fine Chemicals Co | And 4 more authors.
Journal of Materials Chemistry | Year: 2012

A self-standing, flexible and transparent microporous film made of alumina nano-fibers is applied as a host to design new functional hybrid materials. Luminescent Schiff base molecules, N-salicylidene-p-toluidine, were found to fully, stably, and homogeneously occupy the slit-like micropore of the film from X-ray diffraction, optical spectra, and N 2 gas adsorption isotherm measurements. Photoluminescence (PL) intensity of the hybrid film was sensitive to the type of transition metal ions dispersed in aqueous solution. For example, Zn 2+ and Cu 2+ ions in the solutions were involved with the apparent increase and decrease of the PL intensity, respectively. This unique alumina film has high potential to be a candidate of a host matrix for designing new hybrid materials with noble functions. © 2012 The Royal Society of Chemistry. Source


Trademark
Kawaken Fine Chemicals Co. | Date: 2009-08-25

Surface active chemical agents, namely, surfactants for use in the manufacture of detergents, personal care products, dental care products, hard surface cleaners; textile auxiliaries, namely, chemicals used in the manufacture of fabric or textiles;chemical additives for use in the manufacture of pharmaceutical preparations for wounds.


Nagai N.,Japan National Institute of Advanced Industrial Science and Technology | Nagai N.,Kawaken Fine Chemicals Co | Mizukami F.,Japan National Institute of Advanced Industrial Science and Technology | Mizukami F.,Kawaken Fine Chemicals Co
Journal of Materials Chemistry | Year: 2011

Transparent and nanoporous self-standing films consisting of oriented boehmite nanofibres were fabricated via the self-assembly of the fibres. The film-forming ability of boehmite nanofibres was closely related to their aspect ratio, and the fibres of 100 to 5000 in aspect ratio were favourable to fabricate the films. Crystallinity and stability of boehmite fibres and the films increased with an increase in the aspect ratio of the fibres. The boehmite films were easily transformed to γ-, - and α-Al 2O 3 films by calcination while keeping the original shapes of the films. Transformation temperatures to γ-, - and α-Al 2O 3 films tended to rise, respectively, with the aspect ratio of the fibres forming the films. When the boehmite films were calcined at the temperatures of 300 °C to 800 °C, the obtained γ-Al 2O 3 films exhibited bright bluish-white emission under the excitation of a UV lamp. The emission intensity tended to increase with a decrease in the aspect ratio of the fibres forming films. This journal is © The Royal Society of Chemistry. Source


Nagai N.,Japan National Institute of Advanced Industrial Science and Technology | Nagai N.,Kawaken Fine Chemicals Co | Suzuki Y.-H.,Japan National Institute of Advanced Industrial Science and Technology | Sekikawa C.,Japan National Institute of Advanced Industrial Science and Technology | And 5 more authors.
Journal of Materials Chemistry | Year: 2012

The texture of porous films prepared from boehmite nanofibres changed from the lengthwise orientation to the random orientation with the addition of ammonia, and with this change, the shape of the pores in the films turned from slit-like into mesh-like while increasing both the pore size and pore volume. The pore size and volume of the films also increased with an increase in the length of the fibres. When the porous films were used for the immobilization of four lipases with different sizes, the films with the mesh texture exhibited higher immobilization ability than the films with the slit texture. It was found that not only the pore size and volume but also the surface charge and hydroxyl groups are important for the immobilization of enzymes. Among the four lipases used, the lipase with the biggest size (ca. 9.5 nm) was most firmly immobilized on the film with the peak top of pore diameter at 10 nm in the distribution curve, and this immobilized lipase exhibited higher activity in the hydrolysis of 2,3-dimercaptopropanol trilactate than the corresponding native one and was recyclable. © 2012 The Royal Society of Chemistry. Source

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