スピネル粉末およびスピネルスラリー

Japanese Patent JP4622010

B2

PROBLEM TO BE SOLVED: To provide MgAl2O4 spinel powder which can be used as a carrier to give a catalyst having an excellent NOx-clearing performance, and to provide a slurry which contains the spinel powder and can easily be coated as a coating material to produce a coating film not generating peelings and cracks. SOLUTION: This MgAl2O4 spinel powder has a specific surface area of >=80 m2/g, an average particle diameter of 3 to 20 μm, and fine pores having an identical size. The spinel powder is obtained, concretely, by subjecting hydroxide raw materials comprising aluminum hydroxide having an average particle diameter (D1) and magnesium hydroxide having an average particle diameter (D2) in a D1/D2 ratio expressed by the inequality: '2<(D1/D2)' or '0.5>(D1/D2)' to 8 coprecipitation method, calcining the synthesized product and then pulverizing the obtained MgAl2O4 spinel.

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Toshio Yamamoto
Akihiko Suda

JP22059599A

February 02, 2011

August 04, 1999

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Toyota Central R & D Labs.

B01D53/86; B01D53/94; C01F7/16; B01J23/42

JP8259851A
JP7313931A
JP10249199A
JP6190279A
JP7213906A
JP2000128527A
JP2000103616A
JP6191838A
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JP63060106A
JP59232915A
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JP59073431A
JP8252887A

WALDNER,K.F. et al.,Synthesis of a Double Alkoxide Precursor to Spinel (MgAl2O4) Directly from Al(OH)3, MgO, and Triethanolamine and Its Pyrolytic Transformation to Spinel,Chem. Mater.,1996年,Vol.8, No.12,pp.2850-2857
SUYAMA,Y. et al.,Characterization and sintering of Mg-Al spinel prepared by spray-pyrolysis technique,Ceram. Int.,1982年,Vol.8, No.1,pp.17-21

Noriaki Miyakoshi

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