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

Teschner, D., Pirault-Roy, L., Naud, D., Guerin, M., & Paál, Z. (2003). Methylcyclopentane reactions on Rh Ge/Al2O3 catalysts prepared by controlled surface reaction. Applied Catalysis A, 252(2), 421-426. doi:10.1016/S0926-860X(03)00494-0.

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Teschner, Detre1, Author           
Pirault-Roy, Laurence, Author
Naud, D., Author
Guerin, Maurice, Author
Paál, Zoltan, Author
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

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Free keywords: Rh and Rh-Ge catalysts; Tailor-made catalysts; MCP ring-opening Methylcyclopentane ring opening
 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)/Al2O3 catalysts. These were obtained by wet impregnation and adding different amounts of Ge by anchoring of Ge(n-C4H9)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.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Issued
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 248741
DOI: 10.1016/S0926-860X(03)00494-0
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Title: Applied Catalysis A
  Alternative Title : Appl. Catal. A
Source Genre: Journal
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Pages: - Volume / Issue: 252 (2) Sequence Number: - Start / End Page: 421 - 426 Identifier: -