Comparison between homogeneous and sol-gel-encapsulated rhodium-quaternary ammonium ion pair catalysts

Jochanan Blum; Ayelet Rosenfeld; Nava Polak; Osnat Israelson; Herbert Schumann; David Avnir

doi:10.1016/1381-1169(95)00222-7

Comparison between homogeneous and sol-gel-encapsulated rhodium-quaternary ammonium ion pair catalysts

Jochanan Blum^*, Ayelet Rosenfeld, Nava Polak, Osnat Israelson, Herbert Schumann, David Avnir

^*Corresponding author for this work

Institute of Chemistry

Research output: Contribution to journal › Article › peer-review

46 Scopus citations

Abstract

The ion pairs RhCl₃/Aliquat 336® and RhCl₃/[Me₃N(CH₂)₃Si(OMe) ₃]Cl were entrapped in SiO₂ sol-gel matrices, and used as catalysts for isomerization of allylbenzene, disproportionation of 1,3-cyclohexadiene, hydrogenation of alkenes, alkynes, arenes, nitriles and nitro-compounds, and for hydroformylation of C-C double bonds. The immobilized ion pairs proved to be stable, leach-proof and recyclable. Occasionally the catalytic efficiency dropped upon recycling, owing to pore blockage but the activity could be restored by treatment with boiling water. The performances of the sol-gel-entrapped ion pairs were compared with those of the homogeneous RhCl₃/Aliquat 336 catalyst. In most cases the immobilized catalysts proved superior to their homogeneous version.

Original language	English
Pages (from-to)	217-223
Number of pages	7
Journal	Journal of Molecular Catalysis A: Chemical
Volume	107
Issue number	1-3
DOIs	https://doi.org/10.1016/1381-1169(95)00222-7
State	Published - 1996

Keywords

Hydroformylation
Hydrogenation
Immobilized catalysts
Rhodium
Sol-gel

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10.1016/1381-1169(95)00222-7

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title = "Comparison between homogeneous and sol-gel-encapsulated rhodium-quaternary ammonium ion pair catalysts",

abstract = "The ion pairs RhCl3/Aliquat 336{\textregistered} and RhCl3/[Me3N(CH2)3Si(OMe) 3]Cl were entrapped in SiO2 sol-gel matrices, and used as catalysts for isomerization of allylbenzene, disproportionation of 1,3-cyclohexadiene, hydrogenation of alkenes, alkynes, arenes, nitriles and nitro-compounds, and for hydroformylation of C-C double bonds. The immobilized ion pairs proved to be stable, leach-proof and recyclable. Occasionally the catalytic efficiency dropped upon recycling, owing to pore blockage but the activity could be restored by treatment with boiling water. The performances of the sol-gel-entrapped ion pairs were compared with those of the homogeneous RhCl3/Aliquat 336 catalyst. In most cases the immobilized catalysts proved superior to their homogeneous version.",

keywords = "Hydroformylation, Hydrogenation, Immobilized catalysts, Rhodium, Sol-gel",

author = "Jochanan Blum and Ayelet Rosenfeld and Nava Polak and Osnat Israelson and Herbert Schumann and David Avnir",

year = "1996",

doi = "10.1016/1381-1169(95)00222-7",

language = "אנגלית",

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journal = "Journal of Molecular Catalysis A: Chemical",

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T1 - Comparison between homogeneous and sol-gel-encapsulated rhodium-quaternary ammonium ion pair catalysts

AU - Blum, Jochanan

AU - Rosenfeld, Ayelet

AU - Polak, Nava

AU - Israelson, Osnat

AU - Schumann, Herbert

AU - Avnir, David

PY - 1996

Y1 - 1996

N2 - The ion pairs RhCl3/Aliquat 336® and RhCl3/[Me3N(CH2)3Si(OMe) 3]Cl were entrapped in SiO2 sol-gel matrices, and used as catalysts for isomerization of allylbenzene, disproportionation of 1,3-cyclohexadiene, hydrogenation of alkenes, alkynes, arenes, nitriles and nitro-compounds, and for hydroformylation of C-C double bonds. The immobilized ion pairs proved to be stable, leach-proof and recyclable. Occasionally the catalytic efficiency dropped upon recycling, owing to pore blockage but the activity could be restored by treatment with boiling water. The performances of the sol-gel-entrapped ion pairs were compared with those of the homogeneous RhCl3/Aliquat 336 catalyst. In most cases the immobilized catalysts proved superior to their homogeneous version.

AB - The ion pairs RhCl3/Aliquat 336® and RhCl3/[Me3N(CH2)3Si(OMe) 3]Cl were entrapped in SiO2 sol-gel matrices, and used as catalysts for isomerization of allylbenzene, disproportionation of 1,3-cyclohexadiene, hydrogenation of alkenes, alkynes, arenes, nitriles and nitro-compounds, and for hydroformylation of C-C double bonds. The immobilized ion pairs proved to be stable, leach-proof and recyclable. Occasionally the catalytic efficiency dropped upon recycling, owing to pore blockage but the activity could be restored by treatment with boiling water. The performances of the sol-gel-entrapped ion pairs were compared with those of the homogeneous RhCl3/Aliquat 336 catalyst. In most cases the immobilized catalysts proved superior to their homogeneous version.

KW - Hydroformylation

KW - Hydrogenation

KW - Immobilized catalysts

KW - Rhodium

KW - Sol-gel

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ER -

Comparison between homogeneous and sol-gel-encapsulated rhodium-quaternary ammonium ion pair catalysts

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Keywords

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