Characteristics of desulfation behavior for presulfated Pt-BaO/CeO 2 lean NOx trap catalyst: The role of the CeO2 support

Document Type

Article

Publication Date

12-1-2009

Abstract

The desulfation of presulfated Pt-BaO/CeO2 lean NOx trap catalyst was investigated by H2 TPRX (temperature programmed reaction), in situ TR-XRD (time-resolved X-ray diffraction), and in situ S K-edge XANES (X-ray absorption near edge spectroscopy) techniques. Compared with Pt-BaO/Al2O3 materials, a reductive treatment in H 2 for the CeO2-supported sample up to 1073 K removes, at most, only a very small amount of sulfur species. However, the results of in situ TR-XRD measurements demonstrate that the quantity of a BaS phase formed on Pt-BaO/CeO2 is much smaller than that on Pt-BaO/Al2O 3, implying that the formation of BaS crystallites, which occurs during the reduction from sulfate (SO42-) to sulfide (S2-), is significantly suppressed in the CeO2-supported catalyst. As the desulfation temperature increases under reducing conditions (in H2), in situ S XANES spectra show that, compared with alumina-supported samples, the reduction temperature for sulfates (S6+) decreases by about 150 K. Concomitantly, the formation of sulfur species with lower oxidation states (S2--S4+) is enhanced. The absolute intensities of S XANES spectra before and after desulfation are very similar, implying that the amount of sulfur-containing species removed during the reductive treatment is negligible, in agreement with the results of H2 TPRX. These results suggest that H2S produced by the reduction of BaSO4 is readily readsorbed on the ceria support to form ceria-sulfur complexes (e.g., Ce 2O2S). The high affinity of ceria for H2S, combined with the ease of reducibility of the ceria support material gives rise to various oxidation states of sulfur after high-temperature H2 treatments. Thus, the results of this study clearly show that the ceria support strongly affects the overall desulfation mechanism. The intrinsic role of the ceria support during desulfation and its effect on the overall NOx storage processes are discussed on the basis of the characterization results obtained here. © 2009 American Chemical Society.

Identifier

73249143672 (Scopus)

Publication Title

Journal of Physical Chemistry C

External Full Text Location

https://doi.org/10.1021/jp9062548

e-ISSN

19327455

ISSN

19327447

First Page

21123

Last Page

21129

Issue

50

Volume

113

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