Jump to main content
Jump to site search

Issue 10, 2013
Previous Article Next Article

Catalyst recycling via specific non-covalent adsorption on modified silicas

Author affiliations

Abstract

This article describes a new strategy for the recycling of a homogeneous hydroformylation catalyst, by selective adsorption of the catalyst to tailor-made supports after a batchwise reaction. The separation of the catalyst from the product mixture is based on selective non-covalent supramolecular interactions between a ligand and the support. Changing the solvent releases the active catalyst back into the reactor and allows a subsequent batch reaction with the recycled active catalyst. For this purpose, the bidentate NixantPhos ligand has been equipped with a pyridine group. The corresponding rhodium pre-catalyst [Rh(Nix-py)(acac)] (acac = acetylacetonate) forms a very selective, active and highly stable catalyst, and able to reach a turnover number (TON) of 170 000 in a single run (reaction performed in nearly neat 1-octene, S/C ratio of 200 000, at 140 °C, 20 bars syngas pressure). Various commercially available supports have been explored in binding studies and recycling experiments. The end-capped silica-alumina performs the best so far with respect to ligand-adsorbing properties for the current purpose. Although this system has not been fully optimized, four recycling runs could be performed successfully.

Graphical abstract: Catalyst recycling via specific non-covalent adsorption on modified silicas

Back to tab navigation

Article information


Submitted
04 Sep 2012
Accepted
05 Dec 2012
First published
04 Jan 2013

Dalton Trans., 2013,42, 3609-3616
Article type
Paper

Catalyst recycling via specific non-covalent adsorption on modified silicas

A. M. Kluwer, C. Simons, Q. Knijnenburg, J. I. van der Vlugt, B. de Bruin and J. N. H. Reek, Dalton Trans., 2013, 42, 3609
DOI: 10.1039/C2DT32047A

Social activity

Search articles by author

Spotlight

Advertisements