Systèmes catalytiques écocompatibles à base de biopolymères et de liquides ioniques: catalyseurs homogènes hétérogénéisés efficaces, recyclables et réutilisables - Ecofriendly transition metal catalytic systems based on renewable biopolymeric support an – BIOPSIL
EFFICIENT BIOSSOURCED ORGANOMETALLIC CATALYSTS
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Efficient organometallic catalyst based on natural polymers and ionic liquid
Awareness of impact of chemistry on the environment favors the emergence of new industrial processes that respond to various criteria: biodegradable materials, catalytic processes in high yield under mild conditions, no release of heavy metals, use of raw materials from renewable resources, recycling of supported catalysts, use of green solvents, and lower amounts of solvents used. In this context, the objective of this project is to develop new catalytic materials, clean, efficient and innovative issued from waste of the sea, by immobilising a ionic liquid phase containing an organometallic catalyst with a natural marine polymer support. This process allows to combine the advantages of heterogeneous catalysis, used industry and homogeneous known for its efficiency and selectivity. The catalytic materials have been optimized to be used under different conditions (solvent, temperature), to limit the leaching of the catalytic metal in the product. The prospects of this work will be to adapt to industrial processes, including continuous flow, and in the context of new directions in chemistry, applied to the reactions of biomass conversion.
In order to achieve effective and recyclable catalysts, easy to prepare, that limit the leaching of the catalytic metal and that can be used in different experimental conditions, two processes have been developed: the impregnation of IL/catalyst on the biopolymer, or immobilization of IL/catalyst in the biopolymer matrix. In both cases, a special attention was paid to the preparation of biopolymer support to access a high porosity and good mechanical stability. The nature and volume of ionic liquid has also been optimized depending on the reaction conditions studied: without solvent, with aqueous solvent or with organic solvent. Palladium and ruthenium catalysts have been prepared and tested in some catalytic reactions requiring these metals. In most cases, these reactions are carried out under conditions requiring no additional solvent and catalysts were very effective and have been used many times without loss of activity. On the other hand, some reactions were carried out in water in semi-continuous flow conditions.
Catalytic palladium-foams prepared from alginate/IL showed significant efficiency in the hydrogenation reaction in aqueous media using the streaming technology. On the other hand, catalytic beads of alginate/IL charged ruthenium have been successfully applied in one of the reactions of interest to the industry, the metathesis reaction. This work has resulted in a patent, new research synergies supported by ADEME and ANR involving new academic and industrial partners.
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This project resulted in seven papers published or in press, including 2 with impact factors higher than 5. In addition, three items are being editors and should be submitted by July 2013. The project also resulted in a patent.
Project coordination
Isabelle DEZ (Organisme de recherche)
The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.
Partner
Help of the ANR 367,259 euros
Beginning and duration of the scientific project:
- 36 Months
