Related Experiment Video
Updated: Feb 13, 2026

Predicting Catalyst Extrudate Breakage Based on the Modulus of Rupture
Published on: May 13, 2018
Increasing the selectivity to ethylene in the MTO reaction by enhancing diffusion limitation in the shell layer of
Jiawei Zhong1, Jingfeng Han2, Yingxu Wei2
1National Engineering Laboratory for Methanol to Olefins, State Energy Low Carbon Catalysis and Engineering R&D Center, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China. liuzm@dicp.ac.cn weiyx@dicp.ac.cn and State Key Laboratory of Fine Chemicals, PSU-DUT Joint Center for Energy Research, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China and University of Chinese Academy of Sciences, Beijing 100049, P. R. China.
Abstract:
The zinc cation accommodation in the cavities of the shell layer and the facilitated aromatic formation over the zinc cation modified SAPO-34 with a core-shell like structure introduce extra diffusion limitation for bulky hydrocarbons, which increases the selectivity to ethylene and the ethylene to propylene ratio at the initial stage of the MTO reaction.
Related Concept Videos
Limits to Natural Selection
Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models
Theories of Dissolution: Diffusion Layer Model
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...
Limitations of Friedel–Crafts Reactions
Limiting Reactant
Diffusion

