PROCESS FOR THE DIRECT SYNTHESIS OF Cu CONTAINING SILICOALUMINOPHOSPHATE (Cu-SAPO-34)

摘要

The present invention relates to a process for the preparation of pure silicoaluminophosphate (SAPO-34) and which contains Cu wherein said molecular sieve material is obtained in a single process stage. This process stage is a hydrothermal crystallization stage to which an aqueous solution is subjected which, apart from source of silica, alumina and phosphorous usually employed framework elements of the zeolite framework, already contains all the Cu necessary for the preparation of the final Cu containing silicoaluminophosphate (SAPO34). In addition, the present invention relates to a pure copper containing molecular sieve material as such, having framework structure SAPO-34, having a molar composition according to formula: Cu_0.007-0.125Si_0.01-0.25Al_0.44-0.54P_0.25-0.49O₂, having an amount of impurity phase of less than 25% and having a BET surface area of at least 400 m²/g.