Multi-zone parallel-series plug flow reactor model with catalyst deactivation effect for continuous catalytic reforming process

2018 ◽  
Vol 175 ◽  
pp. 306-319 ◽  
Author(s):  
Xiao-Jian Dong ◽  
Yi-Jun He ◽  
Jia-Ni Shen ◽  
Zi-Feng Ma
Keyword(s):  
Catalyst Deactivation ◽  
Flow Reactor ◽  
Plug Flow ◽  
Plug Flow Reactor ◽  
Reactor Model ◽  
Catalytic Reforming ◽  
Parallel Series

scholarly journals Catalyst Stability Assessment in a Lab-Scale Liquid-Solid (LS)² Plug-Flow Reactor

Catalysts ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 755 ◽  
Author(s):  
Anton De Vylder ◽  
Jeroen Lauwaert ◽  
Stijn Van Auwenis ◽  
Jeriffa De Clercq ◽  
Joris W. Thybaut
Keyword(s):  
Catalyst Deactivation ◽  
Flow Reactor ◽  
Catalyst Activity ◽  
Plug Flow ◽  
Experimental Tests ◽  
Packed Bed ◽  
Plug Flow Reactor ◽  
Catalyst Stability ◽  
Commercial Resin ◽  
Intrinsic Kinetics

A packed-bed plug-flow reactor, denoted as the lab-scale liquid-solid (LS)² reactor, has been developed for the assessment of heterogeneous catalyst deactivation in liquid-phase reactions. The possibility to measure intrinsic kinetics was first verified with the model transesterification of ethyl acetate with methanol, catalyzed by the stable commercial resin Lewatit K2629, for which a turnover frequency (TOF) of 6.2 ± 0.4 × 10−3 s−1 was obtained. The absence of temperature and concentration gradients was verified with correlations and experimental tests. The potential for assessing the deactivation of a catalyst was demonstrated by a second intrinsic kinetics evaluation where a methylaminopropyl (MAP)-functionalized mesoporous silica catalyst was used for the aldol reaction of acetone with 4-nitrobenzaldehyde in different solvents. The cooperative MAP catalyst deactivated as a function of time on stream when using hexane as solvent. Yet, the monofunctional MAP catalyst exhibited stable activity for at least 4 h on stream, which resulted in a TOF of 1.2 ± 0.1 × 10−3 s−1. It did, however, deactivate with dry acetone or DMSO as solvent due to the formation of site-blocking species. This deactivation was mitigated by co-feeding 2 wt % of water to DMSO, resulting in stable catalyst activity.

Transient isotopic tracing of nickel catalyst deactivation in a plug-flow reactor

1997 ◽  
Vol 151 (1) ◽  
pp. 97-107 ◽  
Author(s):  
Masood Otarod ◽  
John Happel ◽  
Yee Soong ◽  
Eric Walter ◽  
Luc Pronzato
Keyword(s):  
Nickel Catalyst ◽  
Catalyst Deactivation ◽  
Flow Reactor ◽  
Plug Flow ◽  
Plug Flow Reactor ◽  
Isotopic Tracing
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