Deactivation and regeneration of Claus catalyst particles unraveled by pore network model

Publikationstyp
Journal Article
Date Issued
2020-01-16
Sprache
English
Author(s)
Liu, Xinlei  
Zhang, Qunfeng  
Ye, Guanghua  
Li, Jinjin  
Li, Ping  
Zhou, Xinggui  
Keil, Frerich 
Institut
Chemische Reaktionstechnik V-2  
TORE-URI
http://hdl.handle.net/11420/3765
Journal
Chemical engineering science  
Volume
211
Article Number
115305
Citation
Chemical Engineering Science (211): 115305 (2020-01-16)
Publisher DOI
10.1016/j.ces.2019.115305
Scopus ID
2-s2.0-85074221424
A pore network model is proposed to study the deactivation of Claus catalysts caused by sulfur condensation, as well as the corresponding regeneration. This model allows to describe the coupled reaction, diffusion, and sulfur condensation from a single pore to a catalyst particle. The results show that the deactivation branch of apparent activities is well above the regeneration branch in the temperature and pressure ranges where capillary condensation of sulfur occurs. This phenomenon of multiple steady states can be attributed to the inconsistent contents of liquid sulfur in the catalyst particle when changing temperature and pressure in different directions. The catalyst particle shape and pore network structure directly influence diffusion resistance, internal surface area for reaction, and sulfur condensation, and subsequently pass these influences on to the apparent activity. This work should provide a proper model and some useful guidelines for the design of catalyst particles for the Claus reaction.
Subjects
Claus catalyst
Deactivation
Multiple steady states
Pore network model
Regeneration
Sulfur condensation