Continuous synthesis of doped layered double hydroxides in a meso-scale flow reactor
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Publication Date
2019Journal Title
Chemical Engineering Journal
ISSN
1385-8947
Publisher
Elsevier BV
Volume
360
Pages
190-199
Type
Article
This Version
AM
Metadata
Show full item recordCitation
Yaseneva, P., An, N., Finn, M., Tidemann, N., Jose, N., Voutchkova-Kostal, A., & Lapkin, A. (2019). Continuous synthesis of doped layered double hydroxides in a meso-scale flow reactor. Chemical Engineering Journal, 360 190-199. https://doi.org/10.1016/j.cej.2018.11.197
Abstract
Layered double hydroxides are a class of low-cost structured nanomaterials with many potential applica-tions in environmental catalysis and sustainable technologies. Their large-scale use is hindered by the chal-lenge of reproducible synthesis at scale. Here we report a general, readily scalable process for the repro-ducible synthesis of transition metal doped hydrotalcites using a two-step process: co-precipitation in a mm-scale (meso-scale) continuous flow reactor, followed by aging. We have shown that co-precipitation in flow at a residence time close to the micromixing time affords good control of particle formation. Re-producible synthesis allowed us, for the first time, to investigate the formation of the pore morphology of hydrotalcites and their thermal stability as a function of metal doping. The obtained samples exhibited sur-face areas (80-150 m2 g-1) higher than those typically attained in batch syntheses, with very low standard deviation between the samples, a high degree of crystallinity and small crystallite sizes, in the range of 9.5-11.9 nm, depending on composition. A systematic characterization allowed us to elucidate the mechanism of the pore morphology formation: the crystallites were found to agglomerate into disk-like platelets, whereas the pore structure of the hydrotalcites is formed by agglomeration of the platelets.
Keywords
Hydrotalcites, Flow chemistry, Continuous processes, Pore morphology
Sponsorship
National Research Foundation, Singapore
Funder references
National Research Foundation Singapore (via Cambridge Centre for Advanced Research and Education in Singapore (CARES)) (unknown)
Identifiers
External DOI: https://doi.org/10.1016/j.cej.2018.11.197
This record's URL: https://www.repository.cam.ac.uk/handle/1810/288296
Rights
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http://www.rioxx.net/licenses/all-rights-reserved
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