| abstract |
The invention describes a porous crystalline material having a chabazite-type framework and having a composition that reflects the molar ratio XO: (n) YO, in which X is a trivalent element such as aluminum, boron, iron, indium and / or gallium; Y is a tetravalent element such as silicon, tin, titanium and / or germanium; and the value of n exceeds 100 and, as a rule, is greater than 200, in particular from 300 to 4000, for example from 400 to 1200. This material is synthesized in a fluoride medium, it exhibits activity and selectivity in the conversion of methanol to lower olefins, mainly to ethylene and propylene. |