Abstract: Fluid catalytic cracking(FCC) slurry as the by-product of the FCC process, can be used to prepare high-end functional carbon materials. It is of great significance to analyze its properties and structural characteristics for further processing and high-value-added utilization. Based on the investigation of basic properties and compositions, the structure of the slurry was characterized by NMR, FTIR, SEM, XRD, and a laser particle size analyzer. The average structural parameters were calculated by the improved Brown-Ladner method. The results show that slurry has the characteristics of high density, high viscosity, and high solid content. The ash content is 0.49%, the aromatic content is 69.48%, the H/C atom ratio is 1.07, and the average molecular structure is acondensed aromatic ring systemwith3.01 rings. The solid particles in theslurry are irregular in shape and formed from the aggregation of molecular sieve catalyst powder. The particle size is mainly distributed in 1—10μm.

Key words: FCC slurry, catalyst, asphaltene, average molecular structure