Method for the synthesis of ZSM-5 zeolite, at atmospheric pressure and at low temperature
    9.
    发明公开
    Method for the synthesis of ZSM-5 zeolite, at atmospheric pressure and at low temperature 失效
    ZSM-5沸石合成方法,在大气压和低温条件下的合成

    公开(公告)号:EP0129239A3

    公开(公告)日:1985-08-28

    申请号:EP84106970

    申请日:1984-06-18

    申请人: Montedison S.p.A.

    摘要: Method for the synthesis of ZSM-5 zeolites at atmospheric pressure, at a temperature preferably from 60 to 100°C wherein:
    a) an aqueous solution containing a quaternary ammonium compound (OA) is added to a second aqueous solution, containing a Si compound, a Na compound and a potassium halogenide (K Hal.), according to the molar ratios:
    -Na 2 O/SiO 2 ≥0.20 (preferably from 0.25 to 2); -H 2 O/SiO 2 = = from 5 to 100 (preferably from 10 to 50); -K Hal/SiO 2 = from 0.03 to 0.50; b) a third aqueous solution, containing A1 sulphate, is added to the mixture obtained according to a); c) to the mixture obtained according to b) an aqueous solution of H 2 SO 4 is added;
    wherein the molar ratio Y = (QA/SiO 2 ) is from 0.02 to 0.08 and the molar ratio Z = SiO 2 /Al 2 O 3 is from 25 to 210, said Y ratio and the molar ratio X = OH - /SiO 2 being represented by points lying within triangles limited by the following 3 straight lines:
    A) Y = 0.7 X; B) X = K/Z, wherein K = 4 (K being constant); C) Y = - 2/3 X + 1 - H, wherein the constant H is obtained from the expression: H = 1/2 (45/Z) 0,317 .