Comment on "combined in situ infrared and kinetic study of the catalytic CO + NO reaction on Pd(111) at pressures up to 240 mbar"

F. Solymosi, T. Bánsági, Tímea Süli Zakar

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Abstract

Following the work of Goodman et al., the position of the absorption bands of NCO formed in the dissociative adsorption of HNCO and in the high-temperature reaction of NO + CO over supported palladium was determined. Two absorption bands in the high-frequency region, at 2175-2185/cm were found, which was attributed to the asymmetric stretch of Pd-NCO and at 2305/cm due to Si-NCO species. There was no sign of the stable band at 2258/cm observed on Pd(111) by Goodman et al. Some additional experiments were performed to determine the position of the NCO band formed in the low-temperature adsorption of HNCO and in the high-temperature reaction of NO + CO on supported palladium. In the first experimental series, the NCO species was produced by HNCO adsorption. Exposure of silica-supported Pd to HNCO at 200-300 K produced an intense band at 2264/cm, a less intense one at 2183/cm, and a very weak one at 2305/cm. Raising the temperature under continuous evacuation led to the attenuation of the band at 2180-2183/cm and to the slight enhancement of the peak at 2305/cm. To avoid the effect of oxidic support, similar measurements on Pd dispersed on NaCl were performed. In the presence of gaseous HNCO, a very intense band appeared again at 2264/cm, which was eliminated by degassing, and a weak band appeared at 2184/cm. The latter band was missing when metal-free NaCl was exposed to HNCO. These results were in agreement with the previous findings, i.e., the asymmetric stretch of NCO attached to Pt metals is in the range of 2180-2195/cm, and this surface complex is a relatively unstable compound.

Original languageEnglish
Pages (from-to)14178-14180
Number of pages3
JournalJournal of Physical Chemistry B
Volume108
Issue number37
Publication statusPublished - Sep 16 2004

Fingerprint

Carbon Monoxide
Infrared radiation
Kinetics
kinetics
Palladium
Adsorption
Absorption spectra
Metals
Temperature
Degassing
adsorption
palladium
Silicon Dioxide
absorption spectra
Silica
degassing
metals
attenuation
silicon dioxide
Experiments

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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Comment on "combined in situ infrared and kinetic study of the catalytic CO + NO reaction on Pd(111) at pressures up to 240 mbar". / Solymosi, F.; Bánsági, T.; Zakar, Tímea Süli.

In: Journal of Physical Chemistry B, Vol. 108, No. 37, 16.09.2004, p. 14178-14180.

Research output: Contribution to journalArticle

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