Modified molecular sieve preparation method

2015 
The invention discloses a modified molecular sieve preparation method. The modified molecular sieve preparation method includes: mixing molecular sieve slurry, a compound solution containing metal ions of IIIB in the periodic table of the elements, an organic complexing agent and/or dispersing agent and a precipitating agent, stirring for at least 10min at a temperature of 5-100 DEG C to obtain mixed slurry of molecular sieves and precipitates containing elements IIIB in the periodic table of the elements, and filtering or not, drying, and calcining or not to obtain modified molecular sieves, wherein a weight ratio of the elements IIIB in terms of oxides to molecular sieve dry basis is 0.3-10:100, a molar ratio of the organic complexing agent to the metal ions of IIIB is 0.3-10:1, and a molar ratio of the dispersing agent to the metal ions is 0.2-16:1. Molecular sieves prepared according to the method have excellent activity stability and resistance to heavy metal pollution.
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