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Magnetic shepherding of nanocatalysts through hierarchically-assembled Fe-filled CNTs hybrid

Melchionna, Michele; Beltram, Alessandro; Stopin, Antoine; Montini, Tiziano; Lodge, Rhys W; Khlobystov, Andrei N.; Bonifazi, Davide; Prato, Maurizio; Fornasiero, Paolo

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Authors

Michele Melchionna

Alessandro Beltram

Antoine Stopin

Tiziano Montini

Rhys W Lodge

Davide Bonifazi

Maurizio Prato

Paolo Fornasiero



Abstract

Mechanically robust, chemically stable and electronically active carbon nanotubes (CNTs) are widely used as supports in catalysis. Synergistic effects between CNT and the active phase critically depend on the homogeneity of the carbon/inorganic interface, whose assembly is difficult to achieve without admixtures of free-standing inorganic matrix. Here we show that Fe-filled CNTs, employed as nanocatalyst supports, allow a facile preparation of highly pure and uniform CNT/nanocatalyst materials, by taking advantage of magnetic separation from poorly-defined components (e.g. aggregates of inorganic nanocatalysts). The higher homogeneity translates into higher catalytic activity in two industrially important processes: the photocatalytic hydrogen production and the water-gas shift reaction, WGSR (increase of ∼48% activity for the former and up to ∼45% for the latter as compared to catalysts isolated by standard filtration). In addition, the magnetic Fe core in the nanotubes enables effective separation and re-use of the nanocatalyst without loss of activity. This study demonstrates significant potential of magnetic CNTs as next generation of sustainable catalyst supports that can improve production of hydrogen and reduce the use of precious metals.

Citation

Melchionna, M., Beltram, A., Stopin, A., Montini, T., Lodge, R. W., Khlobystov, A. N., …Fornasiero, P. (2018). Magnetic shepherding of nanocatalysts through hierarchically-assembled Fe-filled CNTs hybrid. Applied Catalysis B: Environmental, 227, https://doi.org/10.1016/j.apcatb.2018.01.049

Journal Article Type Article
Acceptance Date Jan 21, 2018
Online Publication Date Feb 19, 2018
Publication Date Jul 5, 2018
Deposit Date May 22, 2018
Publicly Available Date Feb 20, 2019
Journal Applied Catalysis B: Environmental
Print ISSN 0926-3373
Electronic ISSN 0926-3373
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 227
DOI https://doi.org/10.1016/j.apcatb.2018.01.049
Keywords Carbon nanotubes ; Hierarchical nanostructures ; Hydrogen evolution ; Water-gas shift ; Pd nanoparticles ; Magnetic nanomaterials
Public URL https://nottingham-repository.worktribe.com/output/944968
Publisher URL https://www.sciencedirect.com/science/article/pii/S0926337318300651

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