The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 20, 2001
Filed:
Oct. 14, 1998
Giannino Pazzucconi, Pavia, IT;
Gianluca Bassi, Milan, IT;
Roberto Millini, Riozzo-Cerro al Lambro, IT;
Carlo Perego, Carnate, IT;
Giovanni Perego, Milan, IT;
Giuseppe Bellussi, Piacenza, IT;
Eni Tecnologie S.p.A., San Donato, IT;
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,),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,=0-10; R(CH,),N—OH/SiO,=0.05-0.4; H,O/SiO,=5-40; metal oxides/SiO,=0-0.02; whereas the ratio H,O/R(CH,),N—OH varies according to the number of carbon atoms in the alkylic chain R as follows: R=n-butyl, H,O/R(CH,),N—OH<35; R=n-pentyl, H,O/R(CH,),N—OH<70; R=n-hexyl, H,O/R(CH,),N—OH<102; R=n-heptyl, H,O/R(CH,),N—OH<136; (b) subjecting the gel or solid obtained in step (a) to drying and calcination.