Ligand-Modified Rhodium Catalysts on Porous Silica in the Continuous Gas-Phase Hydroformylation of Short-Chain Alkenes-Catalytic Reaction in Liquid-Supported Aldol Products

Schönweiz A, Debuschewitz J, Walter S, Woelfel R, Hahn H, Dyballa KM, Franke R, Haumann M, Wasserscheid P (2013)

Publication Status: Published

Publication Type: Journal article

Publication year: 2013

Journal

Publisher: Wiley-VCH Verlag

Book Volume: 5

Pages Range: 2955-2963

DOI: 10.1002/cctc.201300305

Abstract

Ligand-modified Rh complexes were physically adsorbed on the surface of porous silica. The resulting materials were subjected to the continuous gas-phase hydroformylation of C-2 and C-4 alkenes. The ligands used for catalyst modification were bidentate phosphorus ligands known from the literature, namely, sulfoxantphos (1) and a benzopinacol-based bulky diphosphite 2. The tested catalyst materials were active and, in particular, selective as in comparable homogeneous liquid-phase experiments. Long-term stability experiments over 1000h on stream showed minor deactivation. A significant increase in the catalyst mass after the reaction was detected by weighing and thermogravimetric analysis. By using headspace-GC-MS, the mass increase could be attributed to high-boiling compounds, which are formed insitu during the catalytic reaction itself and accumulate inside the pores of the support. Evidence is given that the initially physisorbed catalyst complexes dissolve in the high-boiling aldol side-products, which are suitable solvents for the active catalyst species and provide a liquid-phase environment held by capillary forces on the support.

Authors with CRIS profile

Involved external institutions

Evonik Degussa GmbH Germany (DE)

How to cite

APA:

Schönweiz, A., Debuschewitz, J., Walter, S., Woelfel, R., Hahn, H., Dyballa, K.M.,... Wasserscheid, P. (2013). Ligand-Modified Rhodium Catalysts on Porous Silica in the Continuous Gas-Phase Hydroformylation of Short-Chain Alkenes-Catalytic Reaction in Liquid-Supported Aldol Products. ChemCatChem, 5, 2955-2963. https://doi.org/10.1002/cctc.201300305

MLA:

Schönweiz, Andreas, et al. "Ligand-Modified Rhodium Catalysts on Porous Silica in the Continuous Gas-Phase Hydroformylation of Short-Chain Alkenes-Catalytic Reaction in Liquid-Supported Aldol Products." ChemCatChem 5 (2013): 2955-2963.

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