Issue 4, 2015

Size-dependent CO and propylene oxidation activities of platinum nanoparticles on the monolithic Pt/TiO2–YOx diesel oxidation catalyst under simulative diesel exhaust conditions

Abstract

In this work, we determined the CO and C3H6 oxidation rates of size-selected Pt nanoparticles (1 nm ultrafine size and 8.8 nm nanoscale size average diameters) deposited on TiO2–YOx supports. Both Pt/TiO2–YOx catalysts were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and H2 temperature-programmed reduction (H2-TPR). The results show that platinum particles on the fresh as-synthesized catalysts are fully oxidized to PtO2 during calcination in air; PtO2 can be partly regenerated to the Pt0 active phase under oxygen rich diesel exhaust conditions (containing about 1000 ppm CO), in which the ultrafine Pt particles supplying a larger surface to volume ratio are more beneficial for Pt0 regeneration than the nanoscale ones. Such regeneration of Pt0 occurred even under oxygen rich diesel exhaust conditions, leading to a significantly better global catalytic performance for the DOC reaction. Thus, this work suggests that Pt0 occupation ratio under DOC reaction conditions may become a criteria for identifying the quality of DOC catalysts.

Graphical abstract: Size-dependent CO and propylene oxidation activities of platinum nanoparticles on the monolithic Pt/TiO2–YOx diesel oxidation catalyst under simulative diesel exhaust conditions

Article information

Article type
Paper
Submitted
23 Oct 2014
Accepted
29 Jan 2015
First published
29 Jan 2015

Catal. Sci. Technol., 2015,5, 2358-2365

Author version available

Size-dependent CO and propylene oxidation activities of platinum nanoparticles on the monolithic Pt/TiO2–YOx diesel oxidation catalyst under simulative diesel exhaust conditions

Z. Yang, J. Li, H. Zhang, Y. Yang, M. Gong and Y. Chen, Catal. Sci. Technol., 2015, 5, 2358 DOI: 10.1039/C4CY01384K

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