Tungsten- or molybdenum-based supported compositions, process for obtaining them and use thereof as heterogeneous oxydation catalysts

摘要

Tungsten-(VI) or molybdenum-(VI)-based compounds which contain cationic groups from onium salts anchored on solid inorganic matrices having the general formula (I):        (P)---[(CH₂)_nQ⁺RR'R'']₂[M₂O₁₁]²⁻   (I)wherein:-- (P) represents a solid matrix of inorganic type;-- n represents an integer comprised within the range of from 1 to 20;-- Q represents a pentavalent element belonging to Group VA of the Periodic System;-- R, R' and R'', which may be the same or different from each other, represent a hydrogen atom or an alkyl C₁C₂₀ group;-- M represents a tungsten or molybdenum atom.