CPC B01J 20/103 (2013.01) [B01D 15/14 (2013.01); B01J 20/08 (2013.01); B01J 20/24 (2013.01); B01J 20/28007 (2013.01); B01J 20/28016 (2013.01); B01J 20/2803 (2013.01); B01J 20/28052 (2013.01); B01J 20/283 (2013.01); B01J 20/286 (2013.01); B01J 20/3028 (2013.01); B01J 20/3085 (2013.01); B09B 3/10 (2022.01); C01B 33/18 (2013.01); C02F 1/281 (2013.01); C02F 1/286 (2013.01); C02F 1/288 (2013.01); C22B 11/042 (2013.01); B01J 2220/52 (2013.01); B01J 2220/58 (2013.01); B09B 2101/30 (2022.01); C01P 2004/50 (2013.01); C01P 2004/61 (2013.01); C01P 2004/64 (2013.01); C02F 2101/20 (2013.01); C02F 2103/08 (2013.01); G21F 9/12 (2013.01)] | 2 Claims |
1. A method for producing a silica aggregate containing primary silica particles aggregated, the method comprising:
preparing a dispersion of primary silica particles having an average particle size of 1 nm or more and less than 10 nm;
adding a solution containing at least one of:
a compound represented by at least one of the following formulae (1) to (5), or
a condensate resulting from partial hydrolysis of at least one of the compounds represented by the formulae (1) to (5),
wherein R1 is a hydrogen atom or a monovalent hydrocarbon group having 1 to 8 carbon atoms, R3, R4, R5, R6, and R9 are each independently a monovalent hydrocarbon group having 1 to 8 carbon atoms, R7 and R8 are each independently a divalent hydrocarbon group, and R2 is a divalent hydrocarbon group having 1 to 8 carbon atoms or a divalent group containing —NH—;
removing a dispersion medium from the dispersion; and
crosslinking the primary silica particles to each other,
wherein the silica aggregate contains aluminum oxide on at least a portion of a surface thereof.
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