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Effects of metal content on activity and stability of Ni-Co bimetallic catalysts for CO2 reforming of CH4

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Abstract
Ni-Co bimetallic catalyst with a general formula of Ni-Co-Al-Mg-O prepared using coprecipitation has shown excellent stability and high activity for CO2 reforming of CH4 in our previous research. This paper focuses on the effects of Ni-Co content of the catalyst, attempting to avoid carbon formation on the catalyst. Catalyst samples with Ni and Co loadings ranging between 1.83 and 14.5 wt.% and 2.76 and 12.9 wt.%,
respectively, were prepared and the activity and stability for CO2 reforming of CH4 was tested at 750 8C and 1 atm using a high GHSV of 180,000 mL/gcat h. The results show that catalysts with lower Ni-Co content (1.83–3.61 wt.% for Ni and 2.76–4.53 wt.% for Co) had higher and more stable activity with no deactivation and no detectable carbon formation and that those of higher Ni-Co content (5.28–14.5 wt.% for Ni and 7.95–12.9 wt.% for Co) experienced apparent deactivation with significant carbon formation in 250 h time-on-stream tests. Catalyst characterizations using TEM, XRD, H2-TPR, TG/DTG-TPO, N2-physisorption, and CO-chemisorption indicate that catalyst with lower Ni-Co content has larger surface area, smaller metal particles and better metal dispersion and therefore gives rise to better catalytic performance. The absence of large metal particles (>10 nm) is believed essential to the complete suppression of the carbon formation during reaction.

Keywords: Carbon dioxide; Reforming; Methane; Carbon formation; Synthesis gas; Metal dispersion

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Informasi Detail

Judul Seri

Applied Catalysis A: General

No. Panggil

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Penerbit

London : Elsevier B.V.., 2008

Deskripsi Fisik

Applied Catalysis A: General 339 (2008) 121–129

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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