التفاصيل البيبلوغرافية
| العنوان: |
Visualising Co nanoparticle aggregation and encapsulation in Co/TiO2 catalysts and its mitigation through surfactant residues. |
| المؤلفون: |
Qiu, Chengwu1,2 (AUTHOR), Odarchenko, Yaroslav1,2 (AUTHOR), Lezcano-Gonzalez, Ines1,2 (AUTHOR), Meng, Qingwei3 (AUTHOR), Slater, Tom4 (AUTHOR), Xu, Shaojun2,4 (AUTHOR), Beale, Andrew M.1,2 (AUTHOR) Andrew.Beale@ucl.ac.uk |
| المصدر: |
Journal of Catalysis. Mar2023, Vol. 419, p58-67. 10p. |
| مصطلحات موضوعية: |
*ELECTRON energy loss spectroscopy, *NANOPARTICLES, *SURFACE active agents, *TITANIUM dioxide, *CATALYSTS |
| مستخلص: |
[Display omitted] • STEM-HAADF reveals differences in the (S)MSI compounds forming at the interface of Co/TiO 2 catalysts. • EELS and ED identified Ti 2 O 3 as particularly problematic, covering the surface of Co nanoparticles. • The presence of surfactant residues mitigates the SMSI effect resulting in catalysts with higher CO hydrogenation activity. Due to the reducible nature of TiO 2 , the encapsulation of cobalt nanoparticles (CoNPs) by reduced TiO 2-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 C 12 E 4 surfactant used to prepare the CoNPs, remains on the surface of a TiO 2 rutile support, preventing the formation of Ti3+/Ti2+ oxides and therefore TiO 2-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 C 12 E 4 in the preparation of Co/TiO 2 can be considered beneficial for producing a catalyst with a greater number of active Co species. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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