Research Progress in Properties of SAPO Molecular Sieves

As a novel microporous crystalline,sialic acid( SAPO) molecular with a suitable pore structure sieve behaved good properties,such as acidity,excellent selectivity and thermal stability and became a novel potential catalytic material that was widely used as the conversion of methanol to olefins,isomerization of hydrocarbons and automobile exhaust catalytic materials. The substitution mechanism in SAPO molecular sieve Si atom was summarized. The properties of the acidity,absorption,thermal stability and catalytic were described. The main factors influencing the SAPO molecular sieve structure and performance were outlined,which included the composition ratio,template,silicon source,medium,etc. The current problems of SAPO molecular sieve were analyzed and the further research was proposed.