Process for the preparation of micro-mesoporous gel

US6204217A · kind A · utility

Assignee

• Enitecnologie S.p.A. · IT

Inventors

• Giannino Pazzucconi · Pavia, IT
• Gianluca Bassi · Milano, IT
• Roberto Millini · Melegnano, IT
• Carlo Perego · Vimercate, IT
• Giovanni Perego · Milano, IT
• Giuseppe Bellussi · Piacenza, IT

Key dates

• Filing date: Oct 14, 1998
• Grant date: Mar 20, 2001
• Expiry date: Oct 14, 2018

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2229/42
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Process for the preparation of a micro-mesoporous gel consisting of a silica matrix in which one or more metal oxides are possibly dispersed comprising: (a) subjecting to hydrolysis and gelification a tetra-alkylorthosilicate with an alkyl-trimethylammonium hydroxide having the formula R(CH.sub.3).sub.3 N--OH, wherein R is selected from n-butyl, n-pentyl, n-hexyl and n-heptyl, possibly in the presence of one or more metal compounds, the molar ratios in this mixture being: R--OH/SiO.sub.2 =0-10; R(CH.sub.3).sub.3 N--OH/SiO.sub.2 =0.05-0.4; H.sub.2 O/SiO.sub.2 =5-40; metal oxides/SiO.sub.2 =0-0.02; whereas the ratio H.sub.2 O/R(CH.sub.3).sub.3 N--OH varies according to the number of carbon atoms in the alkylic chain R as follows: R=n-butyl, H.sub.2 O/R(CH.sub.3-).sub.3 N--OH<35; R=n-pentyl, H.sub.2 O/R(CH.sub.3).sub.3 N--OH<70; R=n-hexyl, H.sub.2 O/R(CH.sub.3).sub.3 N--OH<102; R=n-heptyl, H.sub.2 O/R(CH.sub.3).sub.3 N--OH<136; (b) subjecting the gel or solid obtained in step (a) to drying and calcination.