Surface structure and catalytic activity of rapidly quenched amorphous iron based alloys. II. Effect of hydrochloric acid treatment

G. Kisfaludi, Z. Schay, L. Guczi

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Abstract

The surface structure of Fe80B20 and Fe40Ni40B20 amorphous alloys in the as-received state and after HCI treatment was studied by X-ray photoelectron spectroscopy. The surface composition and valence state determined in depth were related to the catalytic activity and selectivity revealed in CO+H2 reaction. It was established that on the shiny side of the Fe80B20 sample deep oxidation took place due to the removal of the boron oxide layer by HCI etching, while on the dull side the originally porous layer became smooth resulting in the formation of a compact oxide layer decreasing thereby the accessible metal sites. On the other hand, on the Fe40Ni40B20 alloy, after removing the prevailing boron oxide and iron oxide layer, an increased number of nickel and iron sites was responsible for the enhanced catalytic activity. Accordingly, on pure iron-boron alloy the catalytic activity considerably decreased whereas on iron-nickel-boron alloy not only a six-fold activity increase was measured but the olefin selectivity was significantly diminished due to the hydrogen activating function of nickel.

Original languageEnglish
Pages (from-to)367-379
Number of pages13
JournalApplied Surface Science
Volume29
Issue number3
DOIs
Publication statusPublished - 1987

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Hydrochloric Acid
hydrochloric acid
Hydrochloric acid
Nickel
Surface structure
Boron
catalytic activity
Catalyst activity
Iron
boron alloys
Human computer interaction
boron oxides
iron
Oxides
Catalyst selectivity
selectivity
Alkenes
Amorphous alloys
nickel
Carbon Monoxide

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Condensed Matter Physics

Cite this

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title = "Surface structure and catalytic activity of rapidly quenched amorphous iron based alloys. II. Effect of hydrochloric acid treatment",
abstract = "The surface structure of Fe80B20 and Fe40Ni40B20 amorphous alloys in the as-received state and after HCI treatment was studied by X-ray photoelectron spectroscopy. The surface composition and valence state determined in depth were related to the catalytic activity and selectivity revealed in CO+H2 reaction. It was established that on the shiny side of the Fe80B20 sample deep oxidation took place due to the removal of the boron oxide layer by HCI etching, while on the dull side the originally porous layer became smooth resulting in the formation of a compact oxide layer decreasing thereby the accessible metal sites. On the other hand, on the Fe40Ni40B20 alloy, after removing the prevailing boron oxide and iron oxide layer, an increased number of nickel and iron sites was responsible for the enhanced catalytic activity. Accordingly, on pure iron-boron alloy the catalytic activity considerably decreased whereas on iron-nickel-boron alloy not only a six-fold activity increase was measured but the olefin selectivity was significantly diminished due to the hydrogen activating function of nickel.",
author = "G. Kisfaludi and Z. Schay and L. Guczi",
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TY - JOUR

T1 - Surface structure and catalytic activity of rapidly quenched amorphous iron based alloys. II. Effect of hydrochloric acid treatment

AU - Kisfaludi, G.

AU - Schay, Z.

AU - Guczi, L.

PY - 1987

Y1 - 1987

N2 - The surface structure of Fe80B20 and Fe40Ni40B20 amorphous alloys in the as-received state and after HCI treatment was studied by X-ray photoelectron spectroscopy. The surface composition and valence state determined in depth were related to the catalytic activity and selectivity revealed in CO+H2 reaction. It was established that on the shiny side of the Fe80B20 sample deep oxidation took place due to the removal of the boron oxide layer by HCI etching, while on the dull side the originally porous layer became smooth resulting in the formation of a compact oxide layer decreasing thereby the accessible metal sites. On the other hand, on the Fe40Ni40B20 alloy, after removing the prevailing boron oxide and iron oxide layer, an increased number of nickel and iron sites was responsible for the enhanced catalytic activity. Accordingly, on pure iron-boron alloy the catalytic activity considerably decreased whereas on iron-nickel-boron alloy not only a six-fold activity increase was measured but the olefin selectivity was significantly diminished due to the hydrogen activating function of nickel.

AB - The surface structure of Fe80B20 and Fe40Ni40B20 amorphous alloys in the as-received state and after HCI treatment was studied by X-ray photoelectron spectroscopy. The surface composition and valence state determined in depth were related to the catalytic activity and selectivity revealed in CO+H2 reaction. It was established that on the shiny side of the Fe80B20 sample deep oxidation took place due to the removal of the boron oxide layer by HCI etching, while on the dull side the originally porous layer became smooth resulting in the formation of a compact oxide layer decreasing thereby the accessible metal sites. On the other hand, on the Fe40Ni40B20 alloy, after removing the prevailing boron oxide and iron oxide layer, an increased number of nickel and iron sites was responsible for the enhanced catalytic activity. Accordingly, on pure iron-boron alloy the catalytic activity considerably decreased whereas on iron-nickel-boron alloy not only a six-fold activity increase was measured but the olefin selectivity was significantly diminished due to the hydrogen activating function of nickel.

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