Imperial College London
Alternate

Prof Klaus Hellgardt

Faculty of Engineering, Department of Chemical Engineering

Professor of Chemical Engineering
 
 
 
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Contact

 

+44 (0)20 7594 5577k.hellgardt

 
 
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Location

 

417AACE ExtensionSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Hii:2018:10.1016/j.cattod.2017.10.013,
author = {Hii, KM and hellgardt and barreiro and Adrio, LA and Hao, Z and van, Ommen JR},
doi = {10.1016/j.cattod.2017.10.013},
journal = {Catalysis Today},
pages = {64--70},
title = {Spatial, temporal and quantitative assessment of catalyst leaching in continuous flow},
url = {http://dx.doi.org/10.1016/j.cattod.2017.10.013},
volume = {308},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Catalyst leaching is a major impediment to the development of commercially-viable processes conducted in a liquid-phase. To date, there is no reliable technique that can accurately identify the extent and dynamics of the leaching process in a quantitative manner. In this work, a tandem flow-reactor system has been developed, which allowed us to distinguish between surface-catalyzed reactions from those occurring in solution by comparing%conversion at the exit of each reactor (S1, S2) corresponding to predominance of heterogeneous/homogeneous reactions (spatial) and two different residence times (temporal). A multiscale model is subsequently established to quantify the two types of reaction rate and simulate the catalyst leaching from a cross-coupling catalyst, PdEncat™ 30; including: (1) a multi-particle sizes model for catalyst scale; and (2) a dispersion model for reactor scale. The results show that catalyst leaching occurs via more than one process, and that the homogeneous Pd-catalyst (leached from the immobilized catalyst and dissolved in the flow) dominates the reaction and possesses a much higher activity than the heterogeneous (immobilized) Pd-catalyst. Additionally, the change of leached Pd stream inside reactors can be predicted along with the axial direction and the reaction time through the reactor-scale dispersion model.
AU  - Hii,KM
AU  - hellgardt
AU  - barreiro
AU  - Adrio,LA
AU  - Hao,Z
AU  - van,Ommen JR
DO  - 10.1016/j.cattod.2017.10.013
EP  - 70
PY  - 2018///
SN  - 0920-5861
SP  - 64
TI  - Spatial, temporal and quantitative assessment of catalyst leaching in continuous flow
T2  - Catalysis Today
UR  - http://dx.doi.org/10.1016/j.cattod.2017.10.013
UR  - http://hdl.handle.net/10044/1/51853
VL  - 308
ER  -
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