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Impact of Cr, Mn and Zr addition on Fe Fischer–Tropsch synthesis catalysis: Investigation at the active site level using SSITKA

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Abstract.
Recently, we reported that Cr, Mn, or Zr promotion of a precipitated Cu-promoted Fe Fischer–Tropsch
synthesis (FTS) catalyst significantly improves its catalytic activity. In this study, we used steady-state
isotopic transient kinetic analysis (SSITKA) of methanation to investigate the activity of these catalysts
at the site level, providing insight into how this promotion enhances catalyst activity. We found that
the activity of the base Fe catalyst was enhanced by promotion with Cr, Mn, and Zr in varying degrees,
depending on the type and concentration of metal added. The addition of these third metals promoted
the dispersion of Fe but did not significantly affect either the BET surface area or reducibility. The
activities of the reaction sites (estimated by 1/τCH4 = TOFITK) were found to be similar regardless of
the type of third metal added, suggesting that the active sites for Fe catalysts with or without thirdmetal
promotion were essentially identical. The higher catalyst activities observed for the Cr-, Mn-, and Zr-promoted Fe catalysts were found to be due primarily to an increased number of active surface intermediates leading to hydrocarbon products.

Keywords:
Fischer–Tropsch synthesis (FTS)
CO hydrogenation
Methanation
Steady-state isotopic transient kinetic
analysis (SSITKA)
Cr promotion
Mn promotion
Zr promotion
Water–gas shift (WGS)
Fe-based FTS catalysts

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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) 142–151

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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