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Excellent sulfur resistance of Pt/BaO/CeO2 lean NOx trap catalysts

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Abstract.
In this work, we investigated the NOx storage behavior of Pt/BaO/CeO2 catalysts, especially in the
presence of SO2. High surface area CeO2 (110 m2/g) with a rod like morphology was synthesized and
used as a support. The Pt/BaO/CeO2 sample demonstrated slightly higher NOx uptake in the entire
temperature range studied compared with Pt/BaO/g-Al2O3. More importantly, this ceria-based catalyst
showed higher sulfur tolerance than the alumina-based one. The time of complete NOx uptake was
maintained even after exposing the sample to 3 g/L of SO2. The same sulfur exposure, on the other hand,
eliminated the complete NOx uptake time on the alumina-based NOx storage catalysts. TEM images show
no evidence of either Pt sintering or BaS phase formation during reductive de-sulfation up to 600 8C on
the ceria-based catalyst, while the same process over the alumina-based catalyst resulted in both a
significant increase in the average Pt cluster size and the agglomeration of a newly formed BaS phase into
large crystallites. XPS results revealed the presence of about five times more residual sulfur after
reductive de-sulfation at 600 oC on the alumina-based catalysts in comparison with the ceria-based ones.
All of these results strongly support that, besides their superior intrinsic NOx uptake properties, ceriabased
catalysts have (a) much higher sulfur tolerance and (b) excellent resistance against Pt sintering
when they are compared to the widely used alumina-based catalysts.

Keywords: Ceria, LNT, Sulfur, Barium oxide, NOx

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Informasi Detail

Judul Seri

Applied Catalysis B: Environmental

No. Panggil

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Penerbit

London : Elsevier B.V.., 2008

Deskripsi Fisik

Applied Catalysis B: Environmental 84 (2008) 545–551

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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