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Kinetic Studies of Carbon Dioxide Reforming of Methane over Ni-Co/Al-Mg-O Bimetallic Catalyst

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The kinetics of CO2 reforming with CH4 over a Ni-Co/Al-Mg-O bimetallic catalyst was investigated in a
fixed bed reactor at a temperature range of 650-750 °C and the partial pressures of CO2 and CH4 ranging
from 30 to 190 kPa. Owing to the simultaneous occurrence of the CO2 reforming reaction and the reverse
water-gas shift reaction (RWGS) in the system, the apparent activation energies with respect to reactant
consumption and product formation were found different and they are 69.4 and 25.9 kJ/mol for CH4 and CO2
consumption and 85.1 and 61.8 kJ/mol for H2 and CO formation, respectively. It was also found that the
reforming rate in terms of CH4 consumption was less sensitive to CO2 partial pressures but had stronger
dependence on CH4 partial pressures. At a constant CH4 partial pressure, the increase in CO2 partial pressure
did not cause significant change in the reforming rate, whereas at a constant CO2 partial pressure the reforming rate increased with the increase in CH4 partial pressure. The increase in extra CO2 at a constant CH4 pressure led to decreases in hydrogen (H2) formation but increase in carbon monoxide (CO) formation due to the simultaneous occurrence of the reverse water-gas shift reaction. A Langmuir-Hinshelwood (L–H) model
was also developed assuming that the dissociation of CH4 and the reaction between the carbon species and
the activated carbon dioxide are the rate determining steps over the Ni–Co/Al–Mg–O. It satisfactorily fits the experimental data as well.

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Informasi Detail

Judul Seri

Ind. Eng. Chem. Res.

No. Panggil

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Penerbit

New York : American Chemical Society., 2009

Deskripsi Fisik

Ind. Eng. Chem. Res. 2009, 48, 677–684

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

Versi lain/terkait

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