(238d) Study on the Application of Polystyrene Nanopaticle in the Preparation of Rfcc Catalysts

The conversion of heavy oils to lighter hydrocarbons in the Fluid Catalytic Cracking (FCC) unit is a reaction rate limited process. As the FCC process evolve, great emphasis has been focused on catalyst components (zeolite, alumina, contaminant traps) to increase catalyst activity and selectivity. This communication describes a novel type pore structure fluid catalytic cracking catalyst. The catalyst was synthesized using the monodisperse polystyrene spheres as template, the pore size of the catalyst is tunable with the size of PS particles. The influences of the size and the amount of template was investigated on the catalyst mechanical strength, pore structure and catalytic performance. The hierachical pore materials was characterized by means of SEM, N2 adsorption and mercury intrusion method. The results showed that the prepared macroporous materials have a hierachical pore structure, high BET surface area and pore volume. When 40vol% polystyrene spheres with the diameter 118nm was used as template, the BET surface area increased by 43m2/g and the pore volume was as twice more as that of the controller catalyst, which was prepared without PS template. The catalytic cracking performance of RFCC catalysts with macroporous structure was tested in a fixed-bed tubular reactor using Daqing atmospheric residue as feed. The experimental results showed that, in compared with the controller catalyst, the macropore catalysts show better performance for Daqing atmospheric residue and the conversion yield was nearly 15.7wt% higher than that of the controller catalyst.

Key words: nanoparticle, catalyst, macroporous , synthesis, heavy oil