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SiO2 supported highly dispersed Pt atoms on LaNiO3 by reducing a perovskite-type oxide as the precursor and used for CO oxidation.
- Source :
-
Catalysis Today . Sep2020, Vol. 355, p222-230. 9p. - Publication Year :
- 2020
-
Abstract
- • LaNi 1- x Pt x O 3 /SiO 2 were prepared by a facile method of citrate acid complexation combined with impregnation. • Pt/LaNiO 3 loaded on SiO 2 was obtained by reducing LaNi 1- x Pt x O 3 /SiO 2. • Pt atoms were highly dispersed on a support by using a perovskite-type oxide as the precursor. • Pt/LaNiO 3 /SiO 2 showed excellent activity and stability for CO oxidation. A new facile method for preparing highly dispersed precious metal catalysts was proposed in this work. Highly dispersed Pt supported on LaNiO 3 /SiO 2 were prepared by using LaNi 1- x Pt x O 3 perovskite as precursors. The catalytic performances of CO oxidation over the prepared catalytsts were investigated. The structural features of the catalysts were characterized by N 2 adsorption-desorption, XRD, H 2 -TPR, TEM, EXAFS, CO-TPD and O 2 -TPD techniques. The result indicated that nanocrystalline of LaNi 1- x Pt x O 3 was supported on SiO 2. Reducing LaNi 1- x Pt x O 3 /SiO 2 could make Pt from the interior of the perovskite crystal lattice onto the surface and then form highly dispersed Pt on the support of LaNiO 3 /SiO 2. As the platinum content was 0.5% or less, platinum atoms could distribute highly even maybe in single atoms. The catalytic test revealed that LaNi 0.95 Pt 0.05 O 3 /SiO 2 exhibited a significant activity and stability for CO oxidation, as well as excellent performance in the presence of both 15 vol.% H 2 O and 12.5 vol.% CO 2. It has been demonstrated that the highly dispersed Pt, the easy reducibility, and sufficient surface oxygen species were responsible for the high catalytic activity of LaNi 0.95 Pt 0.05 O 3 /SiO 2 catalyst. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ATOMS
*METAL catalysts
*OXIDATION
*PRECIOUS metals
*CRYSTAL lattices
Subjects
Details
- Language :
- English
- ISSN :
- 09205861
- Volume :
- 355
- Database :
- Academic Search Index
- Journal :
- Catalysis Today
- Publication Type :
- Academic Journal
- Accession number :
- 146558833
- Full Text :
- https://doi.org/10.1016/j.cattod.2019.04.041