Issue 3, 2015

Influence of sulfation and regeneration on Pt/Al2O3 for NO oxidation

Abstract

Because of the potential crisis of Pt/Al2O3 catalysts being poisoned by S-containing impurities in diesel exhausts, it is important to better understand the deactivation of SO2 and its regeneration effects on Pt/Al2O3 catalysts. In this study, these effects induced by SO2 on Pt/Al2O3 were studied as a function of SO2 exposure time, and NO oxidation activity was investigated for different treated Pt/Al2O3 catalysts. The results show that the SO2 exposure period seriously affects the catalytic ability, especially after a long period of the sulfation process. TEM, CO-DRIFTS, TGA, and STEM-EDS elemental mapping results show that Pt physical and chemical states, and SOx species are considered to be essential parameters in the SOx effects on the catalysts. It is found that partial regeneration in the samples with different SO2 exposure times is primarily caused by an un-recoverable deactivation of edge and kinked Pt atoms during the sulfation process. Moreover, the mechanism of SOx loading and its elimination through the NO oxidation process, investigated by in situ DRIFTS, provides further cognizance on SOx species and their removal. The mechanism reveals a special intermediate SOx species, and thus a possible way in which gaseous SO2 and O2 transform to sulfate on catalysts is expected.

Graphical abstract: Influence of sulfation and regeneration on Pt/Al2O3 for NO oxidation

Supplementary files

Article information

Article type
Paper
Submitted
17 Oct 2014
Accepted
05 Dec 2014
First published
08 Dec 2014

Catal. Sci. Technol., 2015,5, 1731-1740

Author version available

Influence of sulfation and regeneration on Pt/Al2O3 for NO oxidation

Y. Li, M. Shen, J. Wang, T. Wan and J. Wang, Catal. Sci. Technol., 2015, 5, 1731 DOI: 10.1039/C4CY01363H

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