CONTROLLED-ATMOSPHERE ROTATING CELL FOR IN SITU STUDIES OF CATALYSTS USING LASER RAMAN SPECTROSCOPY.

C. P. Cheng, J. D. Ludowise, Glenn L Schrader

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Laser Raman spectroscopy was used to characterize molybdenum on alumina catalysts using a controlled-atmosphere rotating cell. In situ spectra could be recorded at temperatures up to 600 degree C and pressures as low as 1. 333 multiplied by 10** minus **4 Pa. Catalysts were examined during the drying and calcining operations; adsorption of pyridine was also studied. Spectra of the dried and calcined catalysts indicated the presence of aggregated molybdenum species. Close resemblance to the aggregation of molybdenum species in aqueous solution was apparent. At higher loadings of molybdenum, a molybdenum trioxide phase developed. Adsorbed pyridine spectra indicated that a considerable portion of the alumina surface was not covered by molybdenum even after molybdenum trioxide was formed. A new form of pyridine adsorption associated with the aggregated phase was observed.

Original languageEnglish (US)
Pages (from-to)146-150
Number of pages5
JournalApplied Spectroscopy
Volume34
Issue number2
StatePublished - Mar 1980
Externally publishedYes

Fingerprint

controlled atmospheres
Laser spectroscopy
Molybdenum
laser spectroscopy
molybdenum
Raman spectroscopy
Protective atmospheres
catalysts
Catalysts
cells
Aluminum Oxide
Pyridine
pyridines
Adsorption
Alumina
aluminum oxides
adsorption
Drying
Agglomeration
drying

ASJC Scopus subject areas

  • Spectroscopy
  • Instrumentation

Cite this

CONTROLLED-ATMOSPHERE ROTATING CELL FOR IN SITU STUDIES OF CATALYSTS USING LASER RAMAN SPECTROSCOPY. / Cheng, C. P.; Ludowise, J. D.; Schrader, Glenn L.

In: Applied Spectroscopy, Vol. 34, No. 2, 03.1980, p. 146-150.

Research output: Contribution to journalArticle

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