Migration of Adsorbed NCO Species on Pt/SiO2 Catalyst

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Abstract: The spillover of isocyanate (NCO) surface species on Pt/SiO2 catalyst has been investigated by infrared spectroscopy by following the intensities of 2180 cm-1 band (Pt-NCO) and that of 2310 cm-1 band (Si-NCO). Isocyanate was produced by HNCO adsorption. For comparison the adsorption of HNCO on SiO2 has been also examined. The migration of NCO was investigated under different reaction conditions. Attempts to detect the spillover of NCO through gas phase produced negative results. The dissociative adsorption of HNCO on Pt/SiO2 surface occurred already at 190 K as was indicated by the appearance of a strong band at 2180 cm-1. Upon raising the temperature a new band developed at 2310 cm-1 indicative for the migration of NCO from Pt onto SiO2. It was found that the preadsorbed oxygen greatly enhances the stability of NCO on Pt and promotes the migration of NCO from the Pt onto silica.

Original languageEnglish
Pages (from-to)109-121
Number of pages13
JournalStudies in Surface Science and Catalysis
Volume17
Issue numberC
DOIs
Publication statusPublished - 1983

Fingerprint

Isocyanates
Adsorption
catalysts
Catalysts
isocyanates
adsorption
Silicon Dioxide
Infrared spectroscopy
Gases
Silica
Oxygen
infrared spectroscopy
vapor phases
silicon dioxide
oxygen
Temperature
temperature

ASJC Scopus subject areas

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

Cite this

Migration of Adsorbed NCO Species on Pt/SiO2 Catalyst. / Bánsági, T.; Raskó, J.; Solymosi, F.

In: Studies in Surface Science and Catalysis, Vol. 17, No. C, 1983, p. 109-121.

Research output: Contribution to journalArticle

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abstract = "Abstract: The spillover of isocyanate (NCO) surface species on Pt/SiO2 catalyst has been investigated by infrared spectroscopy by following the intensities of 2180 cm-1 band (Pt-NCO) and that of 2310 cm-1 band (Si-NCO). Isocyanate was produced by HNCO adsorption. For comparison the adsorption of HNCO on SiO2 has been also examined. The migration of NCO was investigated under different reaction conditions. Attempts to detect the spillover of NCO through gas phase produced negative results. The dissociative adsorption of HNCO on Pt/SiO2 surface occurred already at 190 K as was indicated by the appearance of a strong band at 2180 cm-1. Upon raising the temperature a new band developed at 2310 cm-1 indicative for the migration of NCO from Pt onto SiO2. It was found that the preadsorbed oxygen greatly enhances the stability of NCO on Pt and promotes the migration of NCO from the Pt onto silica.",
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AU - Bánsági, T.

AU - Raskó, J.

AU - Solymosi, F.

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N2 - Abstract: The spillover of isocyanate (NCO) surface species on Pt/SiO2 catalyst has been investigated by infrared spectroscopy by following the intensities of 2180 cm-1 band (Pt-NCO) and that of 2310 cm-1 band (Si-NCO). Isocyanate was produced by HNCO adsorption. For comparison the adsorption of HNCO on SiO2 has been also examined. The migration of NCO was investigated under different reaction conditions. Attempts to detect the spillover of NCO through gas phase produced negative results. The dissociative adsorption of HNCO on Pt/SiO2 surface occurred already at 190 K as was indicated by the appearance of a strong band at 2180 cm-1. Upon raising the temperature a new band developed at 2310 cm-1 indicative for the migration of NCO from Pt onto SiO2. It was found that the preadsorbed oxygen greatly enhances the stability of NCO on Pt and promotes the migration of NCO from the Pt onto silica.

AB - Abstract: The spillover of isocyanate (NCO) surface species on Pt/SiO2 catalyst has been investigated by infrared spectroscopy by following the intensities of 2180 cm-1 band (Pt-NCO) and that of 2310 cm-1 band (Si-NCO). Isocyanate was produced by HNCO adsorption. For comparison the adsorption of HNCO on SiO2 has been also examined. The migration of NCO was investigated under different reaction conditions. Attempts to detect the spillover of NCO through gas phase produced negative results. The dissociative adsorption of HNCO on Pt/SiO2 surface occurred already at 190 K as was indicated by the appearance of a strong band at 2180 cm-1. Upon raising the temperature a new band developed at 2310 cm-1 indicative for the migration of NCO from Pt onto SiO2. It was found that the preadsorbed oxygen greatly enhances the stability of NCO on Pt and promotes the migration of NCO from the Pt onto silica.

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