Activity and selectivity of fluidized catalytic cracking catalysts in a riser simulator: The role of y-zeolite crystal size

被引：0

作者：

Al-Khattaf, S. ^{[1
]}

De Lasa, H. ^{[1
]}

机构：

[1] Chemical Reactor Engineering Centre, Faculty of Engineering, University of Western Ontario, London, Ont. N6A 5B9, Canada

来源：

Industrial and Engineering Chemistry Research | 1999年 / 38卷 / 04期

关键词：

Aromatic hydrocarbons - Catalyst activity - Catalyst selectivity - Diffusion in solids - Fluid catalytic cracking - Mathematical models - Olefins - Paraffins - Reaction kinetics - Zeolites;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

A kinetic model is developed to describe the product distribution of gas oil cracking in a novel riser simulator. Typical estimated diffusivity of gas oil molecules in 0.1 μm Y-zeolite crystals leads to effectiveness factors of 0.8-1 while for 1.0 μm crystals leads to effectiveness factors of 0.1-0.25. The proposed model predicts that, for medium/low gas oil conversions, the olefin lump is found to be the most abundant product lump followed by paraffins, aromatics, and naphthenes. The model also shows that for high gas oil conversions the paraffin lump increases at the expense of the olefin lump. It is found that 0.1 μm zeolites produce, at moderate/high gas oil conversions, more olefins and less aromatics than 1 μm zeolites. Selectivity differences are explained on the basis of intracrystal diffusivity effects on both cracking and hydrogen-transfer reactions.

引用

页码：1350 / 1356