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Co, Ru and K loadings effects on the activity and selectivity of carbon nanotubes supported cobalt catalyst in Fischer–Tropsch synthesis

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Abstract
An extensive study of Fischer–Tropsch synthesis (FTS) on carbon nanotubes (CNTs) supported cobalt
catalysts with different loadings of cobalt, ruthenium and potassium is reported. Up to 30 wt.% of Co,
1 wt.% of Ru and 0.0066 wt.% of K were added to the catalyst by co-impregnation method. The physicochemical
properties, activity and selectivity of the catalysts were assessed. For the 15 wt.%Co/CNT
catalyst, most of themetal particles were homogeneously distributed inside the tubes and the rest on the
outer surface of the CNTs. Increasing the Co loading to 30 wt.% increased the amount of Co on the outer
surface of the CNTs, increased the cobalt cluster sizes and decreased the reduction temperature and
dispersion. Increasing the Co loading from 15 to 30 wt.% increased the CO conversion from 48 to 86% and
the C5+ selectivity from 70 to 77%. Ruthenium was found to enhance the reducibility of Co3O4 to CoO and
that of CoO to Co0, increase the dispersion and decrease the average cobalt cluster size. However,
potassium was responsible in shifting the reduction temperatures to higher temperatures. 0.5 wt.%Ru
increased the FTS rate of 15 wt.%Co/CNT catalyst by a factor of 1.4 while addition of 0.0066 wt.%K
decreased the FTS rate by a factor of 7.5. Both promoters enhanced the selectivity of FTS towards the
highermolecular weight hydrocarbons however; the effect of Ru is less pronounced. Potassium increased
the olefin to paraffin ratio from 0.73 to 3.5 and the C5+ selectivity from 70 to 87%.

Keywords: Fischer–Tropsch synthesis, Cobalt, Carbon nanotube, Ruthenium, Potassium

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Informasi Detail

Judul Seri

Applied Catalysis A: General

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Applied Catalysis A: General 353 (2009) 193–202

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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