Synthetic inorganic porous material and method for the preparation thereof
US5559070A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 7, 1994 |
| Grant date | Sep 24, 1996 |
| Priority date | — |
| Expiry date | Oct 7, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2523/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Proposed is a novel synthetic inorganic porous material having a chemical composition of the general formula EQU [(SiO.sub.2).sub.8 .multidot.(MO.sub.2/3).sub.a .multidot.(OH).sub.2/3a+b ].sup.b- .multidot.b/c(A.sup.c+), in which M is an ion of a divalent metal, e.g., Mg, A is a cation of an alkali metal, alkaline earth metal, hydrogen or ammonium, the subscript a is a positive number of 3 to 10, b is a positive number of 0.1 to 1 and c is a positive number of 1 to 2, and characterized by a specific surface area of 100 to 800 m.sup.2 /g, average pore diameter of 2 to 8 nm, pore volume of 0.1 to 0.8 cm.sup.3 /g and cation exchange capacity of 0.1 to 1.2 meq/g. This porous material is prepared by a method comprising the steps of: (a) mixing an aqueous solution of sodium silicate and an aqueous solution of a water-soluble salt of a divalent metal M, e.g., magnesium, to form hydrous oxides; (b) separating the hydrous oxides from the precipitation medium; (c) subjecting an aqueous slurry of the hydrous oxides to a hydrothermal reaction at a temperature of from 100.degree. to 300.degree. C.; and (d) drying and heating the hydrothermally obtained product at a temperature of from 100.degre…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.