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Preparation of Porous Mullite Fibers for Support of Environmental Catalyst

Research Project

Project/Area Number 08555152
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Inorganic materials/Physical properties
Research InstitutionTokyo Institute of Technology

Principal Investigator

OKADA Kiyoshi  Tokyo Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (80114859)

Co-Investigator(Kenkyū-buntansha) HAYASHI Shigeo  Akita University, Mining College, Research Institute of Materials and Resources,, 鉱山学部・附属素材資源システム研究施設, 助教授 (20218572)
YASUMORI Atsuo  Tokyo Institute of Technology, Faculty of Engineering, Associate professor, 工学部, 助教授 (40182349)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥19,900,000 (Direct Cost: ¥19,900,000)
Fiscal Year 1997: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1996: ¥18,600,000 (Direct Cost: ¥18,600,000)
KeywordsPorous materials / Fiber / Mullite / Catalyst support / Selective leaching
Research Abstract

Porous materials made of glass fibers and ceramic fibers have high porosity and good permeability for fluid, and were applicable as filters and porous ceramics with high thermal stability and chemical durability. The functions are further expected to improve by increasing specific surface area of the fibers. Therefore, porous mullite fibers were prepared by crystallization and selective leaching of glass fibers because mullite has good thermal stability, oxidation resistance and high chemical durability. First, three kinds of etchent solutions, i.e.NaOH,HF-H_2SO_4 and HF-NH_4F were used in the selective leaching treatment and examined their selectivity by changing the concentration, temperature, solid/solution ratio and soaking time. As the results, HF-NH_4F solution was decided to be the best etchent solution among them. The porous properties of mullite fibers were examined by changing the crystallizing temperatures from 1100 to 1300゚C.Corresponded to these crystallizing temperatures, the surface areas obtained ranged from 12 to 32 m^2/g and the pore sizes ranged from 5 to 36 nm. In this way, porous properties of mullite fibers were found to be tunable by controlling the crystallizing temperature and soaking time. Since the pores prepared in the mullite fibers maintained up to firing temperature 1200゚C,the thermal stability of the porous mullite fibers thus obtained was very high level compared with those of the other porous materials.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] K.Okada, S.Yasohama, S.Hayashi and A.Yasumori: "Mullite Long Fibres Prepared by Sol-Gel Method using water Solvent Systems" Key Eng. Mater.132-136. 1946-49 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Takei, S.Hayashi, A.yasumori and K.Okada: "Preparation of Mesoporous Mullite Fibers by Selective Leaching Method" Proc. Process. Fab. Adv. Mator.(in press). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T. Takei, S. Hayashi, A. yasumori and K. Okada: "Pore Structure and Thermal Stability of Mesoporous Mullite Fibers Prepared by crystallization and Selective Leaching of Al_2O_3-SiO_2 Glass Fibers" J. Porous Mater.(in press). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Okada, S.Yasohama, S.Hayashi and A.Yasumori: "Mullite Long Fibers Prepared by Sol-Gel Method using Water Solvent Systems" Key Engineering Materials. 132-136. 49-1946 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Takei, S.Hayashi, A.Yasumori and K.Okada: "Preparation of Mesoporous Mullite Fibers by Selective Leaching Method" Proceeding of Processing and Fabrication of Advanced Materials. (in press). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Takei, S.Hayashi, A.Yasumori and K.Okada: "Pore Structure and Thermal Stability of Mesoporous Mullite Fibers Prepared by Crystallization and Selective Leaching of Al_2O_3-SiO_2 Glass Fibers" Journal of Porous Materials. (in press). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Okada, S.Yasohama, S.Hayashi and A.Yasumori: "Mullite Long Fibres Prepared by Sol-Gel Megthod using Water Solvent Systems" Key Eng. Mater.132-136. 1946-49 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Takei, S.Hayashi, A.Yasumori and K.Okada: "Preparation of Mesoporous Mullite Fibers by Selective Leaching Method" Proc. Process. Fab. Adv. Mater.(in press). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Takei, S.Hayashi, A.Yasumori and K.Okada: "Pore Structure and Thermal Stability of Mesoparous Mullite Fibers Prepared by Crystallization and Selective Leaching of Al_2O_3-SiO_2 Glass Fibers." J. Porous Mater.(in press). (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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