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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
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
Keywords: Science & Technology
Physical Sciences
Chemistry, Applied
Chemistry, Physical
Engineering, Chemical
Catalyst leaching
Heck reaction
Flow reactors
Homogenous catalysis
Heterogeneous catalysis
03 Chemical Sciences
09 Engineering
Physical Chemistry
Publication Status: Published
Online Publication Date: 2017-10-18
Appears in Collections:Chemistry
Catalysis and Advanced Materials
Chemical Engineering
Faculty of Natural Sciences
Faculty of Engineering