e-journal

Application of NOX storage/release materials based on alkali-earth oxides supported on Al2O3 for high-temperature diesel soot oxidation

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Abstract.
Alkali-earth oxides and nitrates supported on alumina were studied as model systems for NOX storage/
release. Their impact on the high-temperature soot oxidation has been investigated. The stability of
surface nitrates and temperature of NOX release increase parallel to the basicity of the cation. The
presence of soot decreases the temperature of NOX release. The storage capacity depends on the several
factors, such as basicity, dispersion of the cation, and pre-treating conditions. Adsorption of NO with O2
at 200 oC leads to the formation of surface nitrates that mainly exist as ionic nitrates. Stored nitrates
contribute to the soot oxidation and assist to lower the temperature of soot oxidation up to almost
100 8C. In the presence of only NOX storage material the efficiency of NOX utilization is, however, quite
low, around 30%. Therefore, the presence of an oxidation catalyst is essential to increase the efficiency of
NOX utilization for soot oxidation up to 140% and selectivity towards CO2. A combination of oxidation
catalyst with NOX storage materials enables to lower the temperature of soot oxidationmore than 100 oC
for the Sr- and Ca-based systems.

Keywords: Soot oxidation, Diesel particulate filter, NOX storage/release, Alkali-earth catalysts

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Informasi Detail

Judul Seri

Applied Catalysis B: Environmental

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Applied Catalysis B: Environmental 88 (2009) 263–271

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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