Surface characterization of the deactivation of alumina catalysts used for CO synthesis

G. Mink, I. Bertóti, L. Nemeth, G. Gati, M. Mohai, T. Szekely

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

One of the possible routes of producing COS, an important material in organic syntheses, is the CO2+CS2⇔2COS reaction, preferably over gamma-alumina catalysts. Under long-term loading, however, a remarkable loss of the catalytic activity occurs. The nature of the ageing process was studied by a multi-technique approach on high purity [I] and on a commercial grade [II] gamma-alumina, which latter contained na, Ca, and S as surface impurities. On catalyst [I] weak chemisorption of CO2, and COS was observed by the volumetric method, as characterized by the isosteric heats of adsorption. Catalysts [II] chemisorbed CO2 and COS but not CS2 and COS leads to the surface deposition of side products. XPS studies on new, loaded and aged samples have revealed that the ageing of the catalyst is primarily caused by the deposition of sulfur and carbon with carbon in excess, presumably in C-S, C=S, and C-C environments.

Original languageEnglish
Pages (from-to)262-268
Number of pages7
JournalSurface and Interface Analysis
Volume12
Issue number1-12
Publication statusPublished - Jul 1988

Fingerprint

Aluminum Oxide
Carbon Monoxide
deactivation
Alumina
aluminum oxides
catalysts
Catalysts
synthesis
Carbon
Aging of materials
carbon
Chemisorption
Sulfur
chemisorption
catalytic activity
grade
Catalyst activity
purity
sulfur
X ray photoelectron spectroscopy

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Surface characterization of the deactivation of alumina catalysts used for CO synthesis. / Mink, G.; Bertóti, I.; Nemeth, L.; Gati, G.; Mohai, M.; Szekely, T.

In: Surface and Interface Analysis, Vol. 12, No. 1-12, 07.1988, p. 262-268.

Research output: Contribution to journalArticle

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AB - One of the possible routes of producing COS, an important material in organic syntheses, is the CO2+CS2⇔2COS reaction, preferably over gamma-alumina catalysts. Under long-term loading, however, a remarkable loss of the catalytic activity occurs. The nature of the ageing process was studied by a multi-technique approach on high purity [I] and on a commercial grade [II] gamma-alumina, which latter contained na, Ca, and S as surface impurities. On catalyst [I] weak chemisorption of CO2, and COS was observed by the volumetric method, as characterized by the isosteric heats of adsorption. Catalysts [II] chemisorbed CO2 and COS but not CS2 and COS leads to the surface deposition of side products. XPS studies on new, loaded and aged samples have revealed that the ageing of the catalyst is primarily caused by the deposition of sulfur and carbon with carbon in excess, presumably in C-S, C=S, and C-C environments.

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