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- Title
Thermal deactivation mechanism and the effect of Nd addition on the deactivation of the Pt/SiO catalyst for NO oxidation reaction.
- Authors
Chung, Y.-K.; Lee, H.-I.
- Abstract
Pt-based catalysts cannot be used permanently for the diesel after-treatment system because the catalytic activity is decreased due to coarsening of Pt particles at high temperature of the exhaust gas. In this study, to prevent Pt-based catalyst from deactivation, Nd was added to the Pt/SiO catalyst, and the effect of the Nd addition on the catalytic activity was investigated. The Pt/SiO catalyst showed a high catalytic activity for the oxidation of NO but was severely deactivated after the fast thermal aging process. Pt crystallite size was increased and some Pt particles were buried in the SiO pore during the fast thermal aging process, which led to the decrease of catalytic activity. Nd-added Pt/SiO catalyst showed lower activity than Pt/SiO catalyst, but Pt-Nd/SiO catalyst maintained its catalytic activity after fast thermal aging process. It can be postulated that a stable Nd silicate, on which Pt particle is placed, protects SiO pores from destruction and so the number of the catalytically active sites remains nearly unchanged. As a result the Pt-Nd/SiO catalyst maintained its catalytic activity after fast thermal aging process.
- Subjects
PLATINUM catalysts; REACTION mechanisms (Chemistry); NEODYMIUM; NITRIC oxide; OXIDATION; ACTIVATION (Chemistry)
- Publication
Kinetics & Catalysis, 2017, Vol 58, Issue 2, p161
- ISSN
0023-1584
- Publication type
Article
- DOI
10.1134/S0023158417020045