Research progress of SAPO-34 catalyst for methanol to olefins

SAPO-34 as a kind of methanol to olefins(mathanol to olefin,MTO)catalyst,which has good hydrothermal stability and suitable physicochemical properties(such as acidity,pore structure),have high selectivity to light olefins.SAPO-34 zeolite acidity,pore structure of SAPO-34 mainly depends on the raw materials,the synthesis process conditions.This paper investigates the effect of template,synthesis conditions,pretreatment,the ratio of raw materials,metal modification on the structure,acidity and reactivity of SAPO-34.Deeply study of the catalyst,make reference for the synthesize of SAPO-34 molecular sieves with high olefin selectivity.At present,the main problem of SAPO-34 molecular sieve in MTO process is deactivation,short reaction time,regeneration in constant,and high price.So to synthesis a kind of SAPO-34 molecular sieve which has the advantages of low cost,stable performance is the research focus in the future.