| abstract |
A method for producing a metalloaluminophosphate (MeAPO) molecular sieve: (A) making a homogeneous solution comprising at least two sources of aluminum Al, phosphorus P and metal Me; (b) adding a first MeAPO molecular sieve to the solution, the first MeAPO molecular; Before and / or after adding the sieve, the pH is changed to make an amorphous precursor, (c) the amorphous precursor is separated from the water, and if necessary, the amorphous precursor is formed, (D) washing with water if necessary and drying the amorphous precursor at a temperature of 450 ° C. or lower; (e) the amorphous precursor containing the organic template-containing aqueous solution and step (a) In contact with a source of Al, P or Me that is not already present in (f), the amorphous precursor is crystallized under self-generated conditions, and the concentration of the crystalline molecular sieve is reduced to the initial level. Increase with respect to the precursor to obtain a second MeAPO molecular sieve. |