The effect of chemisorbed oxygen on the stability of NCO on platinum, rhodium and palladium supported by silica

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

The stability of NCO species bonded to Pt, Rh and Pd produced by isocyanic acid (HNCO) adsorption has been investigated by infrared spectroscopy. Adsorption of HNCO on supported metals at 190 K produced an intense band at 2180 cm-1 which is attributed to the asymmetric vibration va of NCO formed in the dissociative adsorption of HNCO on the metals. This band started to attenuate above 200 K, partly due to the decomposition of NCO into adsorbed CO and N, and partly due to the migration of NCO from the metals onto silica. These processes are indicated on the ir spectra by the appearance of absorption bands due to Si-NCO and M-CO species. The 2180 cm-1 band indicative of the presence of metal-NCO species was completely eliminated at 350 K on Pd, 400 K on Pt and 425 K on Rh. Oxygen treatment of the supported metals, however, greatly enhanced the stability of NCO on the metals.

Original languageEnglish
Pages (from-to)19-25
Number of pages7
JournalApplied Catalysis
Volume10
Issue number1
DOIs
Publication statusPublished - Apr 13 1984

Fingerprint

Rhodium
Palladium
Platinum
Silica
Oxygen
Metals
Adsorption
Absorption spectra
Infrared spectroscopy
Decomposition
Acids

ASJC Scopus subject areas

  • Engineering(all)

Cite this

@article{ba1567529e544b47bedc43436e4ce166,
title = "The effect of chemisorbed oxygen on the stability of NCO on platinum, rhodium and palladium supported by silica",
abstract = "The stability of NCO species bonded to Pt, Rh and Pd produced by isocyanic acid (HNCO) adsorption has been investigated by infrared spectroscopy. Adsorption of HNCO on supported metals at 190 K produced an intense band at 2180 cm-1 which is attributed to the asymmetric vibration va of NCO formed in the dissociative adsorption of HNCO on the metals. This band started to attenuate above 200 K, partly due to the decomposition of NCO into adsorbed CO and N, and partly due to the migration of NCO from the metals onto silica. These processes are indicated on the ir spectra by the appearance of absorption bands due to Si-NCO and M-CO species. The 2180 cm-1 band indicative of the presence of metal-NCO species was completely eliminated at 350 K on Pd, 400 K on Pt and 425 K on Rh. Oxygen treatment of the supported metals, however, greatly enhanced the stability of NCO on the metals.",
author = "F. Solymosi and J. Rask{\'o}",
year = "1984",
month = "4",
day = "13",
doi = "10.1016/0166-9834(84)85002-2",
language = "English",
volume = "10",
pages = "19--25",
journal = "Applied Catalysis",
issn = "0166-9834",
publisher = "Elsevier BV",
number = "1",

}

TY - JOUR

T1 - The effect of chemisorbed oxygen on the stability of NCO on platinum, rhodium and palladium supported by silica

AU - Solymosi, F.

AU - Raskó, J.

PY - 1984/4/13

Y1 - 1984/4/13

N2 - The stability of NCO species bonded to Pt, Rh and Pd produced by isocyanic acid (HNCO) adsorption has been investigated by infrared spectroscopy. Adsorption of HNCO on supported metals at 190 K produced an intense band at 2180 cm-1 which is attributed to the asymmetric vibration va of NCO formed in the dissociative adsorption of HNCO on the metals. This band started to attenuate above 200 K, partly due to the decomposition of NCO into adsorbed CO and N, and partly due to the migration of NCO from the metals onto silica. These processes are indicated on the ir spectra by the appearance of absorption bands due to Si-NCO and M-CO species. The 2180 cm-1 band indicative of the presence of metal-NCO species was completely eliminated at 350 K on Pd, 400 K on Pt and 425 K on Rh. Oxygen treatment of the supported metals, however, greatly enhanced the stability of NCO on the metals.

AB - The stability of NCO species bonded to Pt, Rh and Pd produced by isocyanic acid (HNCO) adsorption has been investigated by infrared spectroscopy. Adsorption of HNCO on supported metals at 190 K produced an intense band at 2180 cm-1 which is attributed to the asymmetric vibration va of NCO formed in the dissociative adsorption of HNCO on the metals. This band started to attenuate above 200 K, partly due to the decomposition of NCO into adsorbed CO and N, and partly due to the migration of NCO from the metals onto silica. These processes are indicated on the ir spectra by the appearance of absorption bands due to Si-NCO and M-CO species. The 2180 cm-1 band indicative of the presence of metal-NCO species was completely eliminated at 350 K on Pd, 400 K on Pt and 425 K on Rh. Oxygen treatment of the supported metals, however, greatly enhanced the stability of NCO on the metals.

UR - http://www.scopus.com/inward/record.url?scp=0021411436&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0021411436&partnerID=8YFLogxK

U2 - 10.1016/0166-9834(84)85002-2

DO - 10.1016/0166-9834(84)85002-2

M3 - Article

AN - SCOPUS:0021411436

VL - 10

SP - 19

EP - 25

JO - Applied Catalysis

JF - Applied Catalysis

SN - 0166-9834

IS - 1

ER -