FTIR spectroscopic study of thiophene, SO[sub 2], and CO adsorption on Cu/Al[sub 2]O[sub 3] catalysts

Journal Article · Mon Aug 01 00:00:00 EDT 1994 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1994.1230· OSTI ID:6659583

Padley, M B; Rochester, C H ^[1]; Hutchings, G J ^[2]; King, F ^[3]

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1. The University, Dundee (United Kingdom)
2. Liverpool Univ. (United Kingdom)
3. ICI Katalco R T Group, Billingham (United Kingdom)

Infrared spectra are reported of copper-alumina catalysts in various states of oxidation or reduction and exposed to carbon monoxide, thiophene, sulphur dioxide, co-adsorbed carbon monoxide and thiophene, and co-adsorbed sites could be broadly divided into four groups: Cu[sup 2+], Cu[sup +] in a matrix of Cu[sup 2+], Cu[sup +] in a matrix of Cu[sup +], and Cu[sup 0]. Both site-blocking and electronic effects of thiophene on CO adsorption have been identified and are discussed in terms of the nature of the surface-adsorbate interactions, the oxidation state of the adsorption sites, and the specific effects of thiophene on the adsorption site for CO. Sulphur dioxide blocked CO adsorption on Cu[sup 2+] sites. Adsorption of CO on Cu[sup +] sites was non inhibited by adsorption of sulphur dioxide, the latter having an electronic effect on CO molecules at adjacent sites. Adsorption of sulphur dioxide on a reduced Cu[sup 0] surface caused surface oxidation giving Cu[sup +] sites which were available for the subsequent adsorption of CO. The pre-adsorption of CO impeded but did not prevent the oxidative effects of sulphur dioxide chemisorption. 81 refs., 15 figs., 1 tab.

• OSTI ID: 6659583
• Journal Information: Journal of Catalysis; (United States), Vol. 148:2; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CARBON MONOXIDE
ADSORPTION
COPPER
VALENCE
COPPER COMPOUNDS
SORPTIVE PROPERTIES
SULFUR DIOXIDE
THIOPHENE
ABSORPTION SPECTROSCOPY
ALUMINIUM OXIDES
ALUMINIUM COMPOUNDS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
ELEMENTS
HETEROCYCLIC COMPOUNDS
METALS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SORPTION
SPECTROSCOPY
SULFUR COMPOUNDS
SULFUR OXIDES
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties