Adsorption and catalytic reactions of acetonitrile and acetonitrile-oxygen mixture on TiO2-supported rhodium catalysts

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Abstract

The adsorption and surface reactions of acetonitrile and acetonitrile-oxygen gas mixture were studied on TiO2-supported Rh catalysts at 300-673 K. FTIR spectra show different kinds of molecularly adsorbed CH3CN; acetonitrile can be bonded to weak Lewis acid sites (2295 cm-1), to strong Lewis acid sites (2319 cm-1), to very strong Lewis acid centres (2347 cm-1) of titania; it can be coordinated linearly through the lone electron pair of the N atom on Rh sites (2193 cm-1) and η2 (C,N) CH3CN species can be formed on Rh particles (1691-1708 cm-1). CH3CN dissociates on Rh sites, the resulting CN(a) can be oxidized into NCO surface species. CN(a) can be dissociated only on Rh particles into N(a) and C(a). The hydrogenation of N(a) resulted in the appearance of NH3 among the gaseous products from Rh/TiO2 catalysts. The formation of other products (CH 3NH2, H2, CO2, CH4, C2H4 and CO) was demonstrated and discussed.

Original languageEnglish
Pages (from-to)56-61
Number of pages6
JournalApplied Catalysis A: General
Volume303
Issue number1
DOIs
Publication statusPublished - Apr 18 2006

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Lewis Acids
Rhodium
Acetonitrile
Oxygen
Adsorption
Catalysts
Acids
Surface reactions
Carbon Monoxide
Catalyst supports
Gas mixtures
Hydrogenation
Titanium
Atoms
Electrons
acetonitrile

Keywords

  • Acetonitrile adsorption
  • Effect of gaseous oxygen
  • FTIR
  • Gas phase products
  • MS
  • Surface species

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

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abstract = "The adsorption and surface reactions of acetonitrile and acetonitrile-oxygen gas mixture were studied on TiO2-supported Rh catalysts at 300-673 K. FTIR spectra show different kinds of molecularly adsorbed CH3CN; acetonitrile can be bonded to weak Lewis acid sites (2295 cm-1), to strong Lewis acid sites (2319 cm-1), to very strong Lewis acid centres (2347 cm-1) of titania; it can be coordinated linearly through the lone electron pair of the N atom on Rh sites (2193 cm-1) and η2 (C,N) CH3CN species can be formed on Rh particles (1691-1708 cm-1). CH3CN dissociates on Rh sites, the resulting CN(a) can be oxidized into NCO surface species. CN(a) can be dissociated only on Rh particles into N(a) and C(a). The hydrogenation of N(a) resulted in the appearance of NH3 among the gaseous products from Rh/TiO2 catalysts. The formation of other products (CH 3NH2, H2, CO2, CH4, C2H4 and CO) was demonstrated and discussed.",
keywords = "Acetonitrile adsorption, Effect of gaseous oxygen, FTIR, Gas phase products, MS, Surface species",
author = "J. Rask{\'o} and J. Kiss",
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T1 - Adsorption and catalytic reactions of acetonitrile and acetonitrile-oxygen mixture on TiO2-supported rhodium catalysts

AU - Raskó, J.

AU - Kiss, J.

PY - 2006/4/18

Y1 - 2006/4/18

N2 - The adsorption and surface reactions of acetonitrile and acetonitrile-oxygen gas mixture were studied on TiO2-supported Rh catalysts at 300-673 K. FTIR spectra show different kinds of molecularly adsorbed CH3CN; acetonitrile can be bonded to weak Lewis acid sites (2295 cm-1), to strong Lewis acid sites (2319 cm-1), to very strong Lewis acid centres (2347 cm-1) of titania; it can be coordinated linearly through the lone electron pair of the N atom on Rh sites (2193 cm-1) and η2 (C,N) CH3CN species can be formed on Rh particles (1691-1708 cm-1). CH3CN dissociates on Rh sites, the resulting CN(a) can be oxidized into NCO surface species. CN(a) can be dissociated only on Rh particles into N(a) and C(a). The hydrogenation of N(a) resulted in the appearance of NH3 among the gaseous products from Rh/TiO2 catalysts. The formation of other products (CH 3NH2, H2, CO2, CH4, C2H4 and CO) was demonstrated and discussed.

AB - The adsorption and surface reactions of acetonitrile and acetonitrile-oxygen gas mixture were studied on TiO2-supported Rh catalysts at 300-673 K. FTIR spectra show different kinds of molecularly adsorbed CH3CN; acetonitrile can be bonded to weak Lewis acid sites (2295 cm-1), to strong Lewis acid sites (2319 cm-1), to very strong Lewis acid centres (2347 cm-1) of titania; it can be coordinated linearly through the lone electron pair of the N atom on Rh sites (2193 cm-1) and η2 (C,N) CH3CN species can be formed on Rh particles (1691-1708 cm-1). CH3CN dissociates on Rh sites, the resulting CN(a) can be oxidized into NCO surface species. CN(a) can be dissociated only on Rh particles into N(a) and C(a). The hydrogenation of N(a) resulted in the appearance of NH3 among the gaseous products from Rh/TiO2 catalysts. The formation of other products (CH 3NH2, H2, CO2, CH4, C2H4 and CO) was demonstrated and discussed.

KW - Acetonitrile adsorption

KW - Effect of gaseous oxygen

KW - FTIR

KW - Gas phase products

KW - MS

KW - Surface species

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