FISCHER-TROPSCH SYNTHESIS CATALYST FOR SYNGAS TO LOW CARBON OLEFINS, MODIFIED MOLECULAR SIEVE CARRIER AND PREPARATION METHOD THEREOF

摘要

A Fischer-Tropsch synthesis catalyst for syngas to low carbon olefins, the modified molecular sieve carrier and preparation method thereof. The Fischer-Tropsch catalyst components are molecular sieve carrier and active components, the molecular sieve is Ce salt and/or Pr salt modified Si-Al molecular sieve and/or high-Si molecular sieve carrier. The active component comprises main component of Fe, further Mn and Cu as well as alkaline assistants. The content of modified molecular sieve is 40%-80 wt%. The weight content of Ce salt and/or Pr salt is 1%-20% of that of the molecular sieve. The Ce salt and/or Pr salt modified molecular sieve is prepared by treating Si-Al molecular sieve and/or high-Si molecular sieve with acid solution to obtain H-type molecular sieve, impregnating the H-type molecular sieve in Ce salt solution and/or Pr salt solution, then drying and calcining. The Fischer-Tropsch synthesis catalyst for syngas to low carbon olefins is obtained by impregnating the Ce salt and/or Pr salt modified molecular sieve in the salt solution of active components, then drying and calcining.