Chemistry of inorganic compounds – Silicon or compound thereof – Oxygen containing
Patent
1996-10-21
1999-03-30
Lewis, Michael
Chemistry of inorganic compounds
Silicon or compound thereof
Oxygen containing
4233281, 502235, 2523155, C01B 3326
Patent
active
058884661
ABSTRACT:
An amorphous, micro/mesoporous silica-alumina gel with controlled pore size, having a surface area of at least 500 m.sup.2 /g and with a molar ratio of SiO.sub.2 :Al.sub.2 O.sub.3 of at least 30:1, is prepared by hydrolysing and causing a tetra-alkyl ammonium hydroxide, an aluminum trialkoxide, and a tetra-alkyl orthosilicate to gelate, by operating at a temperature equal to, or higher than, the boiling temperature, under atmospheric pressure, of any alcohols which are developed as a by-product from said hydrolysis reaction, without said alcohols being removed, or being substantially removed, from the reaction media; and the so produced gel being dried and fired.
REFERENCES:
patent: 5342814 (1994-08-01), Peratello et al.
patent: 5444032 (1995-08-01), Perego et al.
patent: 5498811 (1996-03-01), Perego et al.
patent: 5500199 (1996-03-01), Bellussi et al.
Journal of Non-Crystalline Solids, vol. 147/148, Oct. 1, 1992, pp. 769-772, T. Lopez, et al., "Catalytic Properties of Silico-Aluminates Prepared by the Sol-Gel Method: Isopropanol Dehydration".
Millini Roberto
Peratello Stefano
Perego Carlo
Agip Petroli S.p.A.
Enichem Synthesis S.p.A.
Eniricerche S.p.A.
Hendrickson Stuart L.
Lewis Michael
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