Process for olefin hydrosilylation involving nanostructured catalysts – HYSINANO
Process for olefin hydrosilylation involving nanostructured catalysts
The HYSINANO project deals with the olefin hydrosilylation process, producing functional silicone oils. This reaction is industrially catalyzed by a platinum complex but the catalyst can not be separated from the products. The objectives of the project is to find solutions to avoid this platinum «consumption«.
Alternatives to the Karstedt catalyst for olefin hydrosilylation
The objectives are to study two solutions to avoid the platinum «consumption«: either by heterogeneization of the platinum or by its replacement other metals.<br />The first part includes a new synthesis method to avoid the leaching of platinum from the supported material. Platinum doping is also a possible approach.<br />In a second part, the synthesis of less expensive catalysts, from metallic nanoparticles, is planned.
All the synthesized catalysts will be characterized according to traditional methods. The catalytic activity of all materials will be evaluated in the 1-octene hydrosilylation reaction. The best catalysts will be used in a continuous reactor after appropriate heterogeneization and/or coating. Other hydrosilylation reactions may also be carried out.
The main results are the following:
- Platinum nanoparticles are a performant hydrosilylation catalyst
- The molecular Karstedt catalyst is rapidly transformed to nanoparticles which are finally responsible for more than 90% of the reaction products.
In the near future, platinum nanoparticles will be immobilised on a support, and other metallic nanoparticles will be synthesized and evaluated.
Article submitted.
The hydrosilylation of olefins, industrially catalysed by a platinum complex, requires a high annual investment in this noble metal, because it is lost with the reaction products. The objective of this project is to study two ways to overcome this problem: either heterogenizing the platinum to maintain it durably in the reactor, or replacing the platinum by a more economic catalyst, with no impact to the environment. The first part corresponds to the work initiated at the end of HEXOSIC project, One of the objectives of this project was to use heterogeneous catalysts in a silicon carbide continuous reactor. However, the use of commercial heterogeneous catalysts in continuous reactors was found unsuitable, mainly because of the platinum leaching, Besides, a new synthesis method was developped to avoid leaching. The optimisation of this preparation will be studied (hydrophobicity, pore size...) as well as the deposition of the catalyst as a thin layer on structured substrates. Doping the platinum with another metal will also be studied as a way to reduce the platinum outstanding. In a second more exploratory part, the total replacement of the platinum by a cheap metal with no impact to the environment will be studied. The methodology will consist in the synthesis of nanoparticles (iron, copper...). The catalytic activity of all the synthesized catalysts will be measured through the model reaction of 1-octene hydrosilyltaion in a semi-batch reactor. The best catalysts will be used in a continuous reactor to evaluate their lifetime and their potential productivity. According to the catalyst nature, its preliminary shaping/immobilisation on substrates will be studied. Finally, the catalysts will also be evaluated in other hydrosilylation reactions.
For confidentiality reasons, the methodology foreseen to immobilise the nanoparticles on supports can not be detailed here.
Project coordination
Valérie MEILLE (Laboratoire de Génie des Procédés Catalytiques)
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
CPE-FCR CPE-FCR
LGPC Laboratoire de Génie des Procédés Catalytiques
BSS Bluestar Silicones France
C2P2-LCOMS Laboratoire de Chimie, Catalyse, Polymères et Procédés
Help of the ANR 371,604 euros
Beginning and duration of the scientific project:
November 2013
- 42 Months
