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Stability of bimetallic Pd–Zn catalysts for the steam reforming of methanol

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Abstract.
ZnO-supported palladium-based catalysts have been shown in recent years to be both active and selective
towards the steam reforming of methanol, although they are still considered to be less active than
traditional copper-based catalysts. The activity of PdZn catalysts can be significantly improved by
supporting them on alumina. Here we show that the Pd/ZnO/Al2O3 catalysts have better long-term
stability when compared with commercial Cu/ZnO/Al2O3 catalysts, and that they are also stable under
redox cycling. The Pd/ZnO/Al2O3 catalysts can be easily regenerated by oxidation in air at 420 ◦C followed
by re-exposure to reaction conditions at 250 ◦C, while the Cu/ZnO based catalysts do not recover their
activity after oxidation. Reduction at high temperatures (>420 ◦C) leads to Zn loss from the alloy
nanoparticle surface resulting in a reduced catalyst activity. However, even after such extreme treatment,
the catalyst activity is regained with time on stream under reaction conditions alone, leading to highly
stable catalysts. These findings illustrate that the nanoparticle surface is dynamic and changes drastically
depending on the environment, and that elevated reduction temperatures are not necessary to achieve
high CO2 selectivity.

Keywords:
Methanol steam reforming
PdZn alloy
STEM
EDS
FTIR
XRD

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Informasi Detail

Judul Seri

Journal of Catalysis

No. Panggil

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Penerbit

London : Elsevier Inc.., 2008

Deskripsi Fisik

Journal of Catalysis 257 (2008) 64–70

Bahasa

English

ISBN/ISSN

00219517

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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