It has generally been accepted that internal diffusion in catalysts has become increasingly important for Fluid Catalytic Cracking (FCC) because of the large molecules of residue, high reaction temperature and the short contact time between the catalysts and the residue during the catalytic process. The creation of mesopores inside FCC catalysts is considered as an effective approach to improve the accessibility and catalyst performance. In this article, some metallic oxides having different pore diameter was used as a matrix to introduce mesopores to the catalysts. The pore structure was characterized by N2 adsorption. The catalytic cracking performance of the catalysts was tested in a fixed-bed tubular reactor or curie point pyrolyzer (CPP) using n-dodecane or VGO as feeds. The matrices with different diameter of mesopores were able to be produced by changing calcination temperature, and the mesopores were introduced into the mixed catalysts. In the catalytic cracking of n-dodecane and VGO as a model reactant, these catalysts showed comparative activities to zeolite single. Some catalysts showed the higher conversion than zeolite single and their gasoline selectivity was improved. From the result of NH3-TPD, it was suggested that the presence of strong acid sites was related to higher conversions of n-dodecane and VGO.

Catalytic cracking characteristics of catalysts using various oxides with different pore diameter as matrices

247th National Meeting (2014)

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