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    3.
    发明专利
    未知

    公开(公告)号：DE68918038T2

    公开(公告)日：1995-01-05

    申请号：DE68918038

    申请日：1989-10-10

    Applicant: AGENCY IND SCIENCE TECHN ,  NISSAN MOTOR

    Inventor： MIZUKAMI FUJIO ,  MAEDA KAZUYUKI ,  NIWA SHUICHI ,  TOBA MAKOTO ,  MINE JUNICHI

    IPC: C01F7/36 ,  B01J21/04

    Abstract: A process for the production of alumina includes a method for controlling the specific surface area of alumina. Control of specific surface area is performed by controlling the porous structure of alumina. In the process, an aluminium alkoxide is subjected to hydrolysis for forming an alumina gel. Before hydrolysis a polyether is used as an organic solvent in order to control the porous structure of produced alumina.

    PROCESS FOR PREPARING CORDIERITE
    7.
    发明专利
    PROCESS FOR PREPARING CORDIERITE 未知

    公开(公告)号：CA2029024A1

    公开(公告)日：1991-05-07

    申请号：CA2029024

    申请日：1990-10-31

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： MAEDA KAZUYUKI ,  MIZUKAMI FUJIO ,  NIWA SHUICHI ,  TOBA MAKOTO ,  SHIMIZU KAZUO

    IPC: C01B33/26 ,  C04B35/195 ,  C04B35/624 ,  C07F7/02

    Abstract: A process for preparing a cordierite, which includes dissolving a silicon compound, an aluminum compound and a magnesium compound in a molar ratio of 1:0.7 to 1:0.3 to 0.5 in a complexing agent represented by the formula R(OCH2CH2)nOH, wherein R is an alkyl group and n is an integer of 1 to 4; heating the resulting solution to bring about a ligand exchange reaction of the silicon compound, aluminum compound and magnesium compound with the complexing agent; conducting hydrolysis to form a gel; drying the gel and sintering the dried gel at 800 DEG to 1450 DEG C.

    8.
    发明专利
    未知

    公开(公告)号：DE68918038D1

    公开(公告)日：1994-10-13

    申请号：DE68918038

    申请日：1989-10-10

    Applicant: AGENCY IND SCIENCE TECHN ,  NISSAN MOTOR

    Inventor： MIZUKAMI FUJIO ,  MAEDA KAZUYUKI ,  NIWA SHUICHI ,  TOBA MAKOTO ,  MINE JUNICHI

    IPC: C01F7/36 ,  B01J21/04

    Abstract: A process for the production of alumina includes a method for controlling the specific surface area of alumina. Control of specific surface area is performed by controlling the porous structure of alumina. In the process, an aluminium alkoxide is subjected to hydrolysis for forming an alumina gel. Before hydrolysis a polyether is used as an organic solvent in order to control the porous structure of produced alumina.

    SPECIFIC SURFACE AREA CONTROL IN ALUMINA
    9.
    发明专利
    SPECIFIC SURFACE AREA CONTROL IN ALUMINA 失效

    公开(公告)号：JPH02102117A

    公开(公告)日：1990-04-13

    申请号：JP25383588

    申请日：1988-10-11

    Applicant: AGENCY IND SCIENCE TECHN ,  NISSAN MOTOR

    Inventor： MIZUKAMI FUJIO ,  MAEDA KAZUYUKI ,  NIWA SHUICHI ,  TOBA MAKOTO ,  MINE JUNICHI

    IPC: C01F7/36

    Abstract: PURPOSE:To obtain high-uniformity alumina of a wide range in its specific surface area including controlled pores by allowing aluminum alkoxide to react with polyether, then drying and calcining the gel formed by hydrolysis of the product. CONSTITUTION:An aluminum alkoxide is dissolved in an organic solvent and allowed to react with a polyether, then hydrolyzed to obtain a gel from the sol. Further the gel is further dried and calcined to give the objective alumina. In this process, polyether is used as a solvent to control the pores of the alumina product. The reaction temperature of the aluminum alkoxide in poly ether ranges from 10 deg.C to the boiling point of the polyether, preferably from 40 to 190 deg.C. The polyether used in the process is generally represented by the formula: R1(OR2),(OR3)m,(OR4)n,OR5 (R1 is alkyl; R2 through R4 are alkylene; R5 is alkyl; 1 is integer including 1).

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