Print Email Facebook Twitter Spatial, temporal and quantitative assessment of catalyst leaching in continuous flow Title Spatial, temporal and quantitative assessment of catalyst leaching in continuous flow Author Barreiro, Elena M. (Imperial College London) Hao, Zhimian (Imperial College London) Adrio, Luis A. (Imperial College London) van Ommen, J.R. (TU Delft ChemE/Product and Process Engineering) Hellgardt, Klaus (Imperial College London) Hii, King Kuok (Imperial College London) Date 2018 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. Subject Catalyst leachingFlow reactorsHeck reactionHeterogeneous catalysisHomogenous catalysisPalladium To reference this document use: http://resolver.tudelft.nl/uuid:7cc59dbf-82ad-4e1b-b659-45a45959e741 DOI https://doi.org/10.1016/j.cattod.2017.10.013 ISSN 0920-5861 Source Catalysis Today, 308, 64-70 Part of collection Institutional Repository Document type journal article Rights © 2018 Elena M. Barreiro, Zhimian Hao, Luis A. Adrio, J.R. van Ommen, Klaus Hellgardt, King Kuok Hii Files PDF 1_s2.0_S0920586117307009_main.pdf 722.42 KB Close viewer /islandora/object/uuid:7cc59dbf-82ad-4e1b-b659-45a45959e741/datastream/OBJ/view