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Journal Article

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


Teschner,  Detre
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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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.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-12B3-4
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.