Preparation of Composite SAPO-11 Zeolite Molecular Sieve and its Hydroisomerization Performance of Shale Oil

Abstract ‒In this paper, SAPO-11 molecular sieve was synthesized by static hydrothermal synthesis method, and SAPO-11 molecular sieve was combined with γ-Al2O3. Then the catalyst was prepared by the bimetallic Co-Mo modification of the support by equal volume impregnation method. SAPO-11 molecular sieve is mainly a spherical aggregate with a regular rectangular surface; At the same time, the composite support can maintain its crystal phase structure well. When bimetallic Co-Mo modification is carried out, the metal dispersion is higher when the metal load is small. As the load increases, aggregation occurs. Using shale oil with JSO < 380℃ as raw material, the performance of different catalysts in the hydroisomerization reaction of shale oil was studied. The results show that γ-Al2O3 has good aromatic saturation and ring-opening properties, and the composite with SAPO-11 molecular sieve is conducive to the hydrogenation isomerization reaction. The content of isopentane in the product of SA type catalyst is greatly increased. The isopane content of 2.5%Co-7.5%Mo/SA catalyst is the highest, reaching 49.08%, which is 12.48% higher than that of SAPO-11 catalyst. The introduction of Co is conducive to the production of olefin, and the content of heteroatomic compounds is reduced, which is conducive to the isomerization in the reaction process. Mo improves the strong acidic site, catalytic activity and isomerism selectivity.