Preparation of P-Type Molecular Sieves from Fischer-Tropsch Synthesis Waste Slag and Its Applications
In order to realize the efficient resource utilization of industrial Fischer-Tropsch synthesis process,P-type molecular sieves were prepared from Fischer-Tropsch synthesis residue with a lot of silicon and aluminum after dewaxing by alkali-fusion-hydrothermal method.The effects of Si/Al ratio,alkali/Si ratio,crystallization temperature and crystallization time on the preparation of P-type molecular sieves were systematically investigated.XRD,FT-IR,SEM and other characterization means were used to analyze the crystalline shape,morphology and structure of the molecular sieves,and the adsorption properties of P-type molecular sieves with Pb2+were investigated.The results show that the P-type molecular sieves synthesized from waste slag under the conditions of n(SiO2)/n(Al2O3)=6.5,n(Na2O)/n(SiO2)=1.8,T=90cC,and t=24 h have a clear and regular morphology profile,no impurity crystalline phases,the highest degree of crystallinity,which is 86.39％,and the largest specific surface area,which is 99.8 m2/g.The maximum equilibrium adsorption capacity of Pb2+in the Fischer-Tropsch synthesis waste slag-based P-type molecular sieves reaches 322.85 mg.The adsorption process is analyzed for adsorption kinetics and it is found that the process conformed to a quasi-secondary kinetic model with an adsorption equilibrium of 319.47 mg/g.
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