Methylcyclopentane reactions on Rh-Ge/Al2O3 catalysts prepared by controlled surface reaction

D. Teschner, L. Pirault-Roy, D. Naud, M. Guérin, Z. Paál

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The reaction mechanism of methylcyclopentane (MCP) ring-opening on Rh catalysts (the participation of each intermediate in further hydrogenolysis versus their desorption) was studied on a special series of Rh(Ge)/Al 2O3 catalysts. These were obtained by wet impregnation and adding different amounts of Ge by anchoring of Ge(n-C4H 9)4 on the surface of Rh with preadsorbed hydrogen. As shown earlier [Appl. Catal. A: Gen. 245 (2003) 15], low amounts of Ge were deposited selectively on low-Miller-index microfacets, whereas excess use of Ge(n-C4H9)4 caused statistical deposition on Rh. This difference induced also alterations in the classical ring-opening pattern: the sample with randomly located Ge behaved like the Parent catalyst with dispersion of 80%. Each ring-opening intermediate hydrogenolyzed further nearly to the same extent; the ring-opening product distribution (ROPD) showing thus no variation as a function of reaction conditions. The catalyst with selective Ge deposition followed, however, the pattern of a sintered sample: the surface intermediate of 2-methylpentane underwent preferential hydrogenolysis to smaller fragments. Thus, changing the position of Ge deposits (without modifying the particle size) induced changes in the prevailing reaction route.

Original languageEnglish
Pages (from-to)421-426
Number of pages6
JournalApplied Catalysis A: General
Volume252
Issue number2
DOIs
Publication statusPublished - Oct 15 2003

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Surface reactions
Hydrogenolysis
Catalysts
Impregnation
Hydrogen
Desorption
Deposits
Particle size
methylcyclopentane

Keywords

  • MCP ring-opening
  • Rh and Rh-Ge catalysts
  • Tailor-made catalysts

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Methylcyclopentane reactions on Rh-Ge/Al2O3 catalysts prepared by controlled surface reaction. / Teschner, D.; Pirault-Roy, L.; Naud, D.; Guérin, M.; Paál, Z.

In: Applied Catalysis A: General, Vol. 252, No. 2, 15.10.2003, p. 421-426.

Research output: Contribution to journalArticle

Teschner, D. ; Pirault-Roy, L. ; Naud, D. ; Guérin, M. ; Paál, Z. / Methylcyclopentane reactions on Rh-Ge/Al2O3 catalysts prepared by controlled surface reaction. In: Applied Catalysis A: General. 2003 ; Vol. 252, No. 2. pp. 421-426.
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