FISCHER-TROPSH SYNTHESIS CATALYST, ITS PRODUCTION AND APPLICATION

摘要

FIELD: process engineering.SUBSTANCE: invention relates to Fisher-Tropsh synthesis catalysts. Fe-base catalyst for Fischer-Tropsh synthesis in fluidised bed contains Fe as active component and comprises transitional metal promoter M, structural promoter S and promoter K. Note here that transitional metal promoter M represents one or several elements consisting of Mn, Cr or Zn while structural promoter S represents SiOand/or AlOFe:M:S:K weight ratio makes 100:1-50:1-50:0.5-10. Note that metal components represent metal elements. Structural component represents oxides. AlO-to-SiOratio in structural promoter S (AlO/SiO) does not exceed 0.5. Catalyst production process comprises the following steps at required proportion of components. Preparing metal nitride solution using Fe, transitional metal promoter M and nitric acid as initial stock. Or preparing mixed metal nitride solution by direct dissolution of metal nitrides. Besides, it comprises adding structural promoter S to metal nitride solution. (2) Coprecipitation of metal nitride solution produced at step (1) to produce precipitated suspension using ammonia water as precipitating agent. (3) Rinsing and filtering precipitated suspension produced at step (2) to produce filtration cake. (4) Adding required amount of potassium salt as promoter K and deionised water to filtration cake. Mincing to produce suspension. Correcting suspension pH to 4-10. (5) Forming catalyst suspension made at step (4) by spray-drying. Annealing formed catalyst to produce catalyst. Note here that Fischer-Tropsh synthesis reaction proceeds in three-phase fluidised bed at 240-280°C.EFFECT: higher selectivity of catalyst.14 cl, 2 tbl, 8 ex