Process for the synthesis of zeolites and mesoporous solids from a homogeneous solution in a semi-open system

摘要

The invention concerns a process for the synthesis of zeolites based on element(s) T and mesoporous solids based on element(s) T, T being silicon and/or aluminium, comprising the following sequence of steps: PPi) synthesizing a reaction medium which is a homogeneous source of element(s) T containing:PPa) at least one source of element(s) T selected from the group formed by aqueous basic solutions of silica or silica and alumina and alcoholic solutions of alkyl tetraorthosilicate and trialkoxyaluminium;P Pb) optionally, at least one structuring agent;PPc) optionally, seeds of the desired crystalline phase;PPii) heating the reaction medium to a temperature in the range 20 C. to 220 C. for a period in the range several minutes and several days; PPiii) injecting at least one chemical agent at a controlled rate to generate polycondensable species in said medium.