Spatial, temporal and quantitative assessment of catalyst leaching in continuous flow

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Title: Spatial, temporal and quantitative assessment of catalyst leaching in continuous flow
Authors: Hii, KM
Hellgardt
Barreiro
Adrio, LA
Hao, Z
Van Ommen, JR
Item Type: Journal Article
Abstract: 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.
Issue Date: 15-Jun-2018
Date of Acceptance: 13-Oct-2017
URI: http://hdl.handle.net/10044/1/51853
DOI: https://dx.doi.org/10.1016/j.cattod.2017.10.013
ISSN: 0920-5861
Publisher: Elsevier
Start Page: 64
End Page: 70
Journal / Book Title: Catalysis Today
Volume: 308
Copyright Statement: © 2017 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/)
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Science and Technology Facilities Council (STFC)
Funder's Grant Number: EP/G070172/1
EP/K503733/1
RSRO_P51116
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Applied
Chemistry, Physical
Engineering, Chemical
Chemistry
Engineering
Catalyst leaching
Palladium
Heck reaction
Flow reactors
Homogenous catalysis
Heterogeneous catalysis
COUPLING REACTIONS
PALLADIUM
HECK
03 Chemical Sciences
09 Engineering
Physical Chemistry
Publication Status: Published
Online Publication Date: 2017-10-18
Appears in Collections:Faculty of Engineering
Chemistry
Catalysis and Advanced Materials
Chemical Engineering
Faculty of Natural Sciences



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