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Controllable preparation of Ni-CeO2 nanoparticles anchored on Al-Mg oxide spheres (AMO) by hydrophobic driving mechanism for dehydrogenative homo-coupling of pyridines.
- Source :
-
Journal of Catalysis . Oct2020, Vol. 390, p90-102. 13p. - Publication Year :
- 2020
-
Abstract
- • The AMO with hollow flower-like was prepared by nanosheets self-assembled. • Controllable anchoring nanoparticles on the AMO by hydrophobic driving mechanism. • The TEOOS and PVP are selected as effective hydrophobic modified reagents. • The prepared catalyst presents excellent catalytic reaction performance. • A possible mechanism illustrates dehydrogenative homo-coupling of pyridines. In this study, we synthesized a series of Ni-based catalysts with different CeO 2 contents (0, 1, 2, 5 and 10 wt%) anchoring on the Al-Mg oxide spheres (AMO) with three-dimensional hollow flower-like structure. The triethoxyoctylsilane (TEOOS) and polyvinylpyrrolidone (PVP) were selected as effective modified reagents to introduce hydrophobic functionality on the surface of AMO and Ni-CeO 2 nanoparticles, respectively, for controllable anchoring Ni-CeO 2 nanoparticles on AMO by hydrophobic interaction driving mechanism. The effects of CeO 2 content on the texture, dispersion of Ni species, the reducibility of Ni2+, surface electronic states and acidity were investigated in detail. The Ni-5CeO 2 /AMO was found to achieve the highest 2,2′-bipyridine selectivity of 90.6% and maximum turnover number (TON) of 8611, specifically. Moreover, the Ni-5CeO 2 /AMO exhibits superior stability, maintaining 89% of 2,2′-bipyridine yield after 6 runs, due to the mitigated nickel leaching and promotion of the desorption of 2,2′-bipyridine. Furthermore, with the help of DFT calculations, a possible reaction mechanism was discussed and illustrated. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00219517
- Volume :
- 390
- Database :
- Academic Search Index
- Journal :
- Journal of Catalysis
- Publication Type :
- Academic Journal
- Accession number :
- 145652992
- Full Text :
- https://doi.org/10.1016/j.jcat.2020.07.032