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Hydrogen production from ethanol over Ir/CeO2 catalysts: A comparative study of steam reforming, partial oxidation and oxidative steam reforming

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Abstract.
Steam reforming, partial oxidation, and oxidative steam reforming of ethanol over Ir/CeO2 catalysts were
studied to elucidate the reaction pathway and determine catalytic stability. Temperature-programmed
desorption and surface reaction revealed that ethoxy species were immediately formed on ethanol
adsorption at room temperature, and were mainly further oxidized to acetate and carbonate species that
finally decomposed into CH4/CO and CO2, respectively. Under reaction conditions, acetaldehyde was the
primary product below 673 K, which decomposed mainly to methane and carbon monoxide at higher
temperatures, whereas methane reforming and the water–gas shift were the major reactions above 773 K.
The Ir/CeO2 catalyst demonstrated rather high stability for the reactions at 823 and 923 K with no
apparent deactivation for 60 h on stream; the mean size of Ir particles was stable at around 2–3 nm,
but the ceria particles sintered significantly from 6–8 to 14–27 nm. CeO2 likely prevented the highly
dispersed Ir particles from sintering and inhibited coke deposition through strong Ir–CeO2 interactions.

Keywords:
Ethanol
Hydrogen
Ir/CeO2
Reaction pathway
Stability

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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) 96–107

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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