Ultratemporally Resolved Fluorescence Imaging Of FCC Catalyst Mass Transfer And Surface Acidic Energy

Nowadays,with the gradual depletion of resources,crude oil is gradually showing a trend of heavier quality,and the refining technology update is imminent.Fluid Catalytic Cracking（FCC）is usually used to process heavy crude oil,which aims to maximize the light weight of the heavy crude oil.Catalytic cracking technology is currently one of the most effective means to realize the lightening of heavy oil,especially the catalytic cracking（FCC）catalyst.Therefore,the development of FCC catalysts with excellent performance is the key to improving the utilization rate of heavy crude oil.However,at this stage,the methods of studying FCC catalysts are relatively simple,such as the characterization of texture information and the characterization of acidity.There are certain limitations related to the texture properties of the FCC catalyst microspheres,the amount of acidic acid and the mass transfer performance,and the real reactive sites cannot be"observed".In this paper,the super-spatial resolution fluorescence microscopy imaging technology was used to investigate p-methoxystyrene and furfuryl alcohol as probe molecules,The mass transfer performance of HZSM-5molecular sieve samples with different Si O₂/Al₂O₃,FCC catalysts with different semi-synthesis substrates（IF-1,IF-2,IF-3）,FCC catalysts with different synthesis methods（SF-1,IF-4）,crystallization time（TSF-1,TSF-2,TSF-3）,and solution treatment（BSF-1,BSF-2,BSF-3,BSF-4）were investigated.The two-dimensional Gaussian fitting program（N-Storm）was used to locate the active sites on the surface of porous catalysts.By comparing the number and distribution of active sites on the surface of different catalysts,it was found that the in-situ crystallization catalyst had better surface active sites than the semi-synthetic catalyst.The point distribution is significantly more uniform and dense.Combining the surface information,texture properties and acidity of the catalyst,it can be seen that the in-situ crystallization of the FCC catalyst at a suitable crystallization time after acid treatment effectively improves the accessibility of the acidic sites on the catalyst surface and optimizes the mass transfer performance.The hyperspace-resolved single-molecule fluorescence microscopy imaging technology is suitable for the study of the mass transfer performance and acid accessibility of shaped catalysts with multi-dimensional and multi-scale pore structures,and provides data support and theoretical guidance for the design of FCC catalysts.