Infrared spectroscopic study of the adsorption and dissociation of methyl halides on silica-supported Pd

Journal Article · Wed Sep 01 04:00:00 EDT 1993 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1993.1260· OSTI ID:5548473

Rasko, J; Bontovics, J; Solymosi, F ^[1]

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1. A. Jozsef Univ., Szeged (Hungary)

The adsorption and dissociation of CH[sub 3]Cl and CH[sub 3]I have been investigated by means of infrared spectroscopy at 193-573 K. Both compounds adsorb molecularly on Pd/SiO[sub 2] at 193 K and interact strongly with the OH groups of silica to form H-bridge-bonded alkyl halides. This was exhibited by a significant attenuation of the absorption band at 3744 cm[sup [minus]1] and by the development of a broad dissociation of CH[sub 3]Cl, was detected first at 263 K and was eliminated above 373 K. Preadsorbed CO and O exerted no observable influence on the adsorption and dissociation CH[sub 3]Cl. However, potassium additive promoted the dissociation and somewhat stabilized the CH[sub 3] group on the surface. The dissociation of CH[sub 3]I occurred at lower temperature and to a greater extent than that of CH[sub 3]Cl. 31 refs., 9 figs., 1 tab.

• OSTI ID: 5548473
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 143:1; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ADSORPTION
CATALYSIS
CATALYST SUPPORTS
CHALCOGENIDES
CHLORINATED ALIPHATIC HYDROCARBONS
DISSOCIATION
ELEMENTS
HALOGENATED ALIPHATIC HYDROCARBONS
HETEROGENEOUS CATALYSIS
IODINATED ALIPHATIC HYDROCARBONS
METALS
METHYL CHLORIDE
METHYL IODIDE
MINERALS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC IODINE COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM METALS
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TRANSITION ELEMENTS