The method for preparing titanium containing SAPO-34 molecular sieve and the method of preparation for light olefin using titanium containing SAPO-34 molecular sieve therefrom

摘要

The present invention relates to a preparing method of a SAPO-34 molecular sieve containing titanium, a SAPO-34 molecular sieve containing titanium prepared by the method and a preparation method of light olefin from methanol using the SAPO-34 molecular sieve. More specifically, the method of the present invention, wherein a titanium precursor is firstly added and then the phosphoric acid is added unlike an existing method which means a synthetic gel is formed after the titanium precursor is added, and the SAPO-34 molecular sieve manufactured by the method has the same structure of porous chabazite mineral and forms Ti well in a molecular sieve whose catalyst activity is relatively large. In a case of using the SAPO-34 molecular sieve as a catalyst for an MTO reaction which manufactures light olefin from oxygenate compounds like methanol, the SAPO-34 molecular sieve is allowed to improve catalyst activity and catalyst life compared with a Ti-SAPO-34 molecular sieve manufactured by the SAPO-34 and an existing method and to increase yield and selection degree of light olefin.