The assay of sulfided molybdena-alumina catalysts

J. Valyon, W. Keith Hall

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Sulfided catalysts were characterized by measuring the comsumption of O2 on reoxidation. The S Mo, O5 Mo, and e Mo ratios could be evaluated. Most of the sulfur was removed and measured as SO2; some SO3 was formed and trapped by the alumina as SO4-2. This was released as SO2 on reduction with H2. The average extent of reduction, e Mo, was calculated after correcting the oxygen consumed for that required to oxidize and replaced the sulfur. The oxygen removed by reduction and sulfiding was measured as H2O, i.e., as WR and WS, respectively. This oxygen removed was mostly compensated by the addition of sulfur. Reduction occurred by breaking bonds between bound molybdena and the alumina surface. The results obtained show that usually S Mo ≤2 and that e Mo ≥ 2. It was concluded, therefore, that valence states below Mo4+ are common in these preparations. Parallel infrared studies were helpful in validating the procedures used.

Original languageEnglish
Pages (from-to)155-166
Number of pages12
JournalJournal of Catalysis
Volume92
Issue number1
DOIs
Publication statusPublished - 1985

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Aluminum Oxide
Assays
Alumina
aluminum oxides
Sulfur
catalysts
Catalysts
sulfur
Oxygen
oxygen
Infrared radiation
valence
preparation

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

The assay of sulfided molybdena-alumina catalysts. / Valyon, J.; Hall, W. Keith.

In: Journal of Catalysis, Vol. 92, No. 1, 1985, p. 155-166.

Research output: Contribution to journalArticle

Valyon, J. ; Hall, W. Keith. / The assay of sulfided molybdena-alumina catalysts. In: Journal of Catalysis. 1985 ; Vol. 92, No. 1. pp. 155-166.
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