Visual analysis of mass transfer enhanced active site utilization efficiency of FCC catalyst
The mass transfer performance of fluid catalytic cracking(FCC)catalysts inhibits the utilization efficiency of active sites,which is a key factor affecting its catalytic performance.In this paper,FCC catalyst samples prepared by 6 different matrix materials were selected,and the catalytic pore structure and acid properties were systematically analyzed.The mass transfer and diffusion behavior of heavy oil macromolecules were simulated by laser confocal fluorescence microscopy and adsorption penetration curve method.The utilization efficiency of active sites of the catalysts was investigated by using single molecule fluorescence imaging technique,and the number of oligomers produced by the oligomerization of thiophene catalyzed by B acid site was used as the criterion.It was found that compared with traditional kaolin and pseudo-boehmite as matrix materials,the macro-porous matrix material(APM-9)with abundant B acid sites designed and developed by our team significantly optimized the uploading performance of macromolecules on FCC catalysts,thus significantly improving the utilization efficiency of active sites.In this paper,a novel method to establish the structure-activity relationship between FCC catalyst structure parameters,its mass transfer performance and acid center utilization efficiency is developed,which can provide data support and theoretical guidance for the design and optimization of catalyst matrix materials.
万方数据
维普
