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Cu/Al2O3 catalysts for soot oxidation: Copper loading effect

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Abstract.
Cu/Al2O3 catalysts with metal loading from 0.64 to 8.8 wt.% have been prepared and characterized by
different techniques: N2 adsorption at 196 8C (BET surface area), ICP (Cu loading), XRD, selective copper
surface oxidation with N2O (Cu dispersion), TPR-H2 (redox properties), and XPS (copper surface species).
The catalytic activity for soot oxidation has been tested both in air and NOx/O2. The activity in air depends
on the amount of easily-reduced Cu(II) species, which are reduced around 275 oC under TPR-H2
conditions. The amount of the most active Cu(II) species increases with the copper loading from Cu_1% to
Cu_5% and remains almost constant for higher copper loading. In the presence of NOx, the first step of the
mechanism is NO oxidation to NO2, and the catalytic activity for this reaction depends on the copper
loading. For catalysts with copper loading between Cu_1% and Cu_5%, the catalytic activity for soot
oxidation in the presence of NOx depends on NO2 formation. For catalysts with higher copper loading this
trend is not followed because of the low reactivity of model soot at the temperature of maximum NO2
production. Regardless the copper loading, all the catalysts improve the selectivity towards CO2
formation as soot oxidation product both under air and NOx/O2.

Keywords: Soot, NOx, Alumina, Copper catalyst

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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) 651–658

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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