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AssigneeMizusawa Industrial Chemicals, Ltd.
InventorsKouichi Usui, Masahide Ogawa, Osamu Okumura, Teiji Sato, Kouichi Yamada, Masanori Tanaka, Noriyuki Takahashi
Estimating the term…
Disclosed is a composite body comprising amorphous and porous silica or silica-alumina and a layer of an aluminum-containing phylosilicate formed on surfaces of primary particles of the silica or silica-alumina. This composite phylosilicate is obtained by reacting a water-soluble silicate, a water-soluble zinc salt or magnesium salt and a water-soluble aluminum salt or aluminate in an aqueous medium containing a sol or gel of silica or silica-alumina. This composite phylosilicate has a large specific surface area and a large pore volume and has both the properties of a solid acid and the properties of a solid base.
A composite phylosilicate comprising amorphous and porous silica or silica-alumina and a layer of an aluminum-containing phylosilicate formed on surfaces of primary particles of said silica or silica-alumina and having, as a whole, a chemical composition represented by three-component oxide molar ratios of SiO.sub.2 of 5 to 80 mole%, MO (M stands for an atom selected from the group consisting of zinc and magnesium) of 5 to 65 mole% and Al.sub.2 O.sub.3 of 1 to 60 mole%, an X-ray diffraction pattern in which there is no substantial peak at a spacing dx of 8.40 to 6.40 .ANG. and there are peaks at a spacing dx of 2.71 to 2.56 .ANG. and a spacing dx of 1.56 to 1.52 .ANG., a specific surface area of at least 200 m.sup.2 /g, and a pore volume of at least 0.25 cc/g in pores having a pore diameter of 10 to 300 .ANG..
A process for the preparation of a composite phylosilicate comprising amorphous and porous silica or silica-alumina and a layer of an aluminum-containing phylosilicate formed on surfaces of primary particles of said silica or silica-alumina as the carrier, said process comprising adding a water-soluble silica silicate, a water-soluble zinc salt and/or a water-soluble magnesium salt, and a water-soluble aluminum salt and/or a water-soluble aluminate to an aqueous medium containing a dispersion of a sol or gel of silica or silica-alumina to produce, as a whole, a chemical composition represented by three-component oxide molar ratios of SiO.sub.2 of 5 to 80 mole%, MO (M stands for an atom selected from the group consisting of zinc and magnesium) of 5 to 65 mole% and Al.sub.2 O.sub.3 of 1 to 60 mole%, and reacting the added salts in the presence of said silica or silica-alumina.
Dependencies are inferred from the claim text.