HCN adsorption on silica and titania supported Rh catalysts studied by FTIR

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Abstract

The adsorption of HCN on SiO2, TiO2, Rh/SiO2 and Rh/TiO2 was investigated by FTIR. HCN adsorbs either in intact molecular form with participation of surface OH groups, or through the lone pair electrons of its nitrogen on oxides; the latter leads to the formation of isocyanide (Si-NC and Ti-NC) surface species. Some of the adsorbed isocyanides undergoes isomerisation forming cyanides (Si-CN and Ti-CN). Hydrogenation of the isocyanides causes the appearance of adsorbed aminomethylidine (CNH2(a)) on oxides. At higher temperatures the isocyanide is oxidized to isocyanate (Si-NCO and Ti-NCO) with the help of OH groups of the oxides. The presence of Rh on silica promotes the formation of the above surface species due to the activity of Rh in HCN dissociation. No such promoter e3ects of Rh on titania were experienced. The dissociation of HCN on Rh produces CN(a) on the metal.

Original languageEnglish
Pages (from-to)3509-3513
Number of pages5
JournalPhysical Chemistry Chemical Physics
Volume4
Issue number14
DOIs
Publication statusPublished - 2002

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Cyanides
Catalyst supports
Silicon Dioxide
titanium
silicon dioxide
Adsorption
catalysts
adsorption
oxides
Oxides
dissociation
isocyanates
cyanides
isomerization
hydrogenation
Isocyanates
nitrogen
Isomerization
causes
Hydrogenation

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Atomic and Molecular Physics, and Optics

Cite this

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title = "HCN adsorption on silica and titania supported Rh catalysts studied by FTIR",
abstract = "The adsorption of HCN on SiO2, TiO2, Rh/SiO2 and Rh/TiO2 was investigated by FTIR. HCN adsorbs either in intact molecular form with participation of surface OH groups, or through the lone pair electrons of its nitrogen on oxides; the latter leads to the formation of isocyanide (Si-NC and Ti-NC) surface species. Some of the adsorbed isocyanides undergoes isomerisation forming cyanides (Si-CN and Ti-CN). Hydrogenation of the isocyanides causes the appearance of adsorbed aminomethylidine (CNH2(a)) on oxides. At higher temperatures the isocyanide is oxidized to isocyanate (Si-NCO and Ti-NCO) with the help of OH groups of the oxides. The presence of Rh on silica promotes the formation of the above surface species due to the activity of Rh in HCN dissociation. No such promoter e3ects of Rh on titania were experienced. The dissociation of HCN on Rh produces CN(a) on the metal.",
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T1 - HCN adsorption on silica and titania supported Rh catalysts studied by FTIR

AU - Raskó, J.

AU - Bánsági, T.

AU - Solymosi, F.

PY - 2002

Y1 - 2002

N2 - The adsorption of HCN on SiO2, TiO2, Rh/SiO2 and Rh/TiO2 was investigated by FTIR. HCN adsorbs either in intact molecular form with participation of surface OH groups, or through the lone pair electrons of its nitrogen on oxides; the latter leads to the formation of isocyanide (Si-NC and Ti-NC) surface species. Some of the adsorbed isocyanides undergoes isomerisation forming cyanides (Si-CN and Ti-CN). Hydrogenation of the isocyanides causes the appearance of adsorbed aminomethylidine (CNH2(a)) on oxides. At higher temperatures the isocyanide is oxidized to isocyanate (Si-NCO and Ti-NCO) with the help of OH groups of the oxides. The presence of Rh on silica promotes the formation of the above surface species due to the activity of Rh in HCN dissociation. No such promoter e3ects of Rh on titania were experienced. The dissociation of HCN on Rh produces CN(a) on the metal.

AB - The adsorption of HCN on SiO2, TiO2, Rh/SiO2 and Rh/TiO2 was investigated by FTIR. HCN adsorbs either in intact molecular form with participation of surface OH groups, or through the lone pair electrons of its nitrogen on oxides; the latter leads to the formation of isocyanide (Si-NC and Ti-NC) surface species. Some of the adsorbed isocyanides undergoes isomerisation forming cyanides (Si-CN and Ti-CN). Hydrogenation of the isocyanides causes the appearance of adsorbed aminomethylidine (CNH2(a)) on oxides. At higher temperatures the isocyanide is oxidized to isocyanate (Si-NCO and Ti-NCO) with the help of OH groups of the oxides. The presence of Rh on silica promotes the formation of the above surface species due to the activity of Rh in HCN dissociation. No such promoter e3ects of Rh on titania were experienced. The dissociation of HCN on Rh produces CN(a) on the metal.

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