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Volume 43, Issue 10
Displaying 1-8 of 8 articles from this issue
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Hidehiro Kamiya, Miho Ohta, Yuko Nakahara, Mayumi Tsukada, Shinji Inag ...2006 Volume 43 Issue 10 Pages 726-730
Published: October 10, 2006
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSMeso-porous silica, which has uniform pores with a diameter of single nanometer, has been applied to various advanced functional materials, such as catalysts and molecular separation membranes. Since this material generally forms particulates with a diameter larger than several micron meters, micrometerscale intra-particle pores exist in a compact and a layer of this material, and therefore the function of the mesopore is not sufficiently desplayed. In this paper, densely packed meso-porous silica powder compact without intra-particles pores was prepared by an isostatic pressing at ultra-high pressure of up to 0.95GPa. Since organic template material is capable of protecting the fracture of meso-pore structure during high pressure isostatic pressing, the meso-pore with a diameter of about 3nm completely remained in the dense compact. After the calcinations at 823K for 6hr to decompose and remove organic template in meso-pore, platinum-particle impregnated meso-porous silica was prepared by soaking it with platinum aqueous solution followed by the calcination at a temperature between 773 and 873K. Since the volume of inter-particles pores were reduced by the ultrahigh pressure isostatic pressing, the grain size of platinum particles on the compact was reduced down to single nm in diameter and the denitration catalyst activity was enhanced.View full abstractDownload PDF (572K) -
JunIchiro Tsubaki, Takamasa Mori, Unenbat Tseveen, Ochirhuyag Bayanjar ...2006 Volume 43 Issue 10 Pages 731-736
Published: October 10, 2006
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSWe have developed a novel filtration technique by adding dispersants instead of flocculants which are commonly used for solid liquid separation. Slurries were prepared by adjusting the pH values in order to control the dispersion and flocculation degree of particles. The prepared slurries were concentrated by gravitational settling condensation or pressure filtration condensation. In the gravitational settling condensation for flocculated slurry, the cake was formed on a filter media and therefore filtration cannot be continued unless the formed cake was excreted by a mechanical hand-scraping device. In addition the volumetric concentration of condensate obtained from the flocculated slurry was at most 15vol%. On the other hand the condensate obtained from the dispersed slurry retained fluidity at a concentration as high as 40vol% without the cake formation, suggesting that the continuous filtration condensation is possible with the dispersants.View full abstractDownload PDF (2052K) -
Effect of Adhesion and Lubrication ForcesTomonari Kobayashi, Toshitsugu Tanaka, Toshihiro Kawaguchi, Tetsuichir ...2006 Volume 43 Issue 10 Pages 737-745
Published: October 10, 2006
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSA discrete particle model for flows of Group A particles in Geldart's classification was studied. Generally, Group A particles have small diameter, so that additional interaction between particles, such as the lubrication force due to interstitial fluid and the adhesion (van der Waals) force due to the intermolecular force may have a strong effect on their fluidization behavior. In this paper, we studied the effects of lubrication and adhesion forces between particles. The calculated results using the DEM model with the adhesion force showed the existence of the non-bubbling (homogeneous) regime and pressure drop hysteresis, which are characteristic features of Group A particles in the fluidized bed.View full abstractDownload PDF (2115K) -
Yoshikazu Miyake2006 Volume 43 Issue 10 Pages 746-754
Published: October 10, 2006
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper describes the preparation methods of spherical mesoporous particles. Spherical mesoporous silica particles of about 0.5mm diameter were prepared from templates of tetrabutoxysilane oil droplets dispersed in alkali solution with cationic surfactant. The nanostructure was the reversed MCM41. Several organic compounds were solubilized in the surfactant of the as-synthesized mesoporous silica particles. The solubilized quantity increased with the hydrophobicity of organic compounds. The solutes with different sizes can be separated using a column packed with calcined-spherical particles. The spherical mesoporous silica particles of about 1μm diameter can also be prepared by using lauryl amine as the basic catalyst and template. The spherical mesoporous silica particles were regularly arrayed on a glass plate coated with titania.View full abstractDownload PDF (7230K) -
Kunihiro Fukui2006 Volume 43 Issue 10 Pages 755-760
Published: October 10, 2006
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThe synthesis of phillipsite from fly ash, which can be used as adsorbents, catalysts etc., was proposed as a new way to reuse fly ash. The effects of morphology of fly ash and the synthesis conditions on the generated zeolite are studied. We proposed a method for selective synthesis of phillipsite improving the purity and yield by introducing microwave heating. The microwave heating enhanced the growth rate of zeolite and improved the crystalline state. The synsethis process which is affected by the microwave irradiation is also clarified.View full abstractDownload PDF (4305K) -
Kenji Iimura2006 Volume 43 Issue 10 Pages 768
Published: October 10, 2006
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (2470K) -
Hiroo Nogami2006 Volume 43 Issue 10 Pages 769-770
Published: October 10, 2006
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (3745K) -
Toshihiro Umekage2006 Volume 43 Issue 10 Pages 772
Published: October 10, 2006
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (148K)
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