Qiu, Chengwu, Odarchenko, Yaroslav, Lezcano-Gonzalez, Ines, Meng, Qingwei, Slater, Tom  ORCID: https://orcid.org/0000-0003-0372-1551, Xu, Shaojun and Beale, Andrew M.
2023.
Visualising Co nanoparticle aggregation and encapsulation in Co/TiO2 catalysts and its mitigation through surfactant residues.
Journal of Catalysis
419
, pp. 58-67.
10.1016/j.jcat.2023.02.002
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Abstract
Due to the reducible nature of TiO2, the encapsulation of cobalt nanoparticles (CoNPs) by reduced TiO2-x is often reported to decrease their catalytic performance in reactions such as Fisher-Tropsch synthesis (FTS). Here, we show using HAADF-STEM imaging and electron energy loss spectroscopy (EELS) that a residual C12E4 surfactant used to prepare the CoNPs, remains on the surface of a TiO2 rutile support, preventing the formation of Ti3+/Ti2+ oxides and therefore TiO2-x migration. Furthermore, the presence of these surfactant residues prevents the coalescence and aggregation of CoNPs during catalyst preparation, maintaining the dispersion of CoNPs. As such, using C12E4 in the preparation of Co/TiO2 can be considered beneficial for producing a catalyst with a greater number of active Co species.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Chemistry Research Institutes & Centres > Cardiff Catalysis Institute (CCI) |
| Publisher: | Elsevier |
| ISSN: | 0021-9517 |
| Funders: | EPSRC |
| Date of First Compliant Deposit: | 2 March 2023 |
| Date of Acceptance: | 3 February 2023 |
| Last Modified: | 03 May 2023 09:11 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/157438 |
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