Unraveling enhanced activity and coke resistance of Pt-based catalyst in bio-aviation fuel refining

Carbon deposition seriously affects the stability of catalyst, which restricts the industrialization of the one-step process for refining bio-aviation fuel. Pt supported on 50%SAPO-11-50%gamma-Al2O3 composite carrier was designed and synthesized, which presented enhanced coke resistance. The bio-aviation fuel with similar properties to the commercial jet fuel was obtained with a high yield of 63.5%. A series of characterization methods (including TG, XRD, H2-TPR, NH3-TPD, Py-IR, XPS, TEM and CO-pulse chemisorption) were utilized to reveal the structure characteristics of catalysts. TEM and CO-pulse chemisorption analysis indicates that the composite carrier is favorable for the dispersion of Pt with small active particles generated. The results from XPS, XRD and H2-TPR shows that the different ratios of Pt0/Pt4+ are generated due to the different interaction between Pt species and carriers. Py-IR results display that the composite carrier provides proper amount of Bronsted acid and Lewis acid sites correlated with the high bio-aviation fuel yield and enhanced coke resistance. The metallic platinum (Pt0) promotes the formation of Bronsted acid sites on catalysts, where excesses Bronsted acid sites causing the olefin polymerization, and inducing the formation of carbon deposition. The study offers an effective strategy to design the catalyst with excellent coke resistance by composite carrier effect toward refining bio-aviation fuel.

Automated summary

The study focused on the impact of carbon deposition on catalyst stability in the one-step process for refining bio-aviation fuel. A Pt supported composite carrier showed enhanced coke resistance, leading to a high yield of bio-aviation fuel with properties similar to commercial jet fuel. Various characterization methods were used to reveal the structure characteristics of the catalysts, showing that the composite carrier facilitated Pt dispersion and provided proper acid sites for improved fuel yield and resistance to coke formation.