The effect of pretreatment on fresh and spent Pt/Al2O3 and Pt-Re/Al2O3 reforming catalysts

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Abstract

Effect of calcination, reoxidation and heating rate in an inert atmosphere on the subsequent reducibility of fresh and spent Pt/Al2O3 and Pt-Re/Al2O3 have been investigated. Catalytic activity was measured in the conversion of n-hexane. It has been established by using temperature programmed reduction (TPR) that after calcination the average oxidation state of the metals in Pt/Al2O3 and Pt-Re/ Al2O3 catalysts is 2.5 and 4.5 respectively. On reoxidation of the reduced catalysts at 720 K, the average oxidation state was 2 and 3.5, respectively, and TPR showed the presence of a separate platinum phase in the Pt-Re/Al2O3 catalysts. A separate Re phase was also observed in the spent Pt-Re/Al2O3 catalysts. In the pretreatment procedure the effect of sulphidation on the catalysts and its ability to retain sulphide was also investigated by a radioactive method using 35S labelled H2S. Pt-Re/Al2O3 retains sulphide very strongly and its affect very much resembles to that of carbon formed at ageing. The behaviour of spent and fresh catalysts was also compared.

Original languageEnglish
Pages (from-to)173-184
Number of pages12
JournalApplied Catalysis
Volume10
Issue number2
DOIs
Publication statusPublished - May 15 1984

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Reforming reactions
Catalysts
Calcination
Oxidation
Hexane
Heating rate
Platinum
Catalyst activity
Aging of materials
Temperature
Carbon
Metals

ASJC Scopus subject areas

  • Engineering(all)

Cite this

The effect of pretreatment on fresh and spent Pt/Al2O3 and Pt-Re/Al2O3 reforming catalysts. / Schay, Z.; Matusek, K.; Guczi, L.

In: Applied Catalysis, Vol. 10, No. 2, 15.05.1984, p. 173-184.

Research output: Contribution to journalArticle

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