CP2D - Chimie et procédés pour un développement durable

Le dioxyde de carbone : une source de carbone durable pour les procédés de synthèse catalysés par des complexes de métaux de transition - Carbon dioxide as a green carbon source in transition metal catalyzed synthesis – CO2 GREEN

Carbon dioxide (CO2) sustainable carbon source for industrial synthesis processes

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The catalysis of CO2 reduction: a potential solution for CO2 valorisation

To help solve the problem of rarefaction and the rising cost of fossil fuels (oil), the discovery of new carbon materials <br />and the development of innovative industrial processes are required. One of the alternative carbon sources widely <br />available is CO2 which has the advantage of being nonflammable, nontoxic and cheap. Given the stability of CO2, its <br />transformation into more reactive carbon molecules requires a large energy supply. This can be greatly reduced by <br />using catalytic processes. In this context, the catalytic reduction of CO2 appears to be a potential solution to convert <br />CO2 into reagents for the chemical industry (e.g. carbon monoxide for the hydroformylation reaction). The energy for <br />this process can be provided by solar energy (photo catalysis), electrical (electrocatalysis) or from both (photoelectrocatalysis). <br />To develop such new processes, new molecular catalysts, such as metallic complexes have been <br />developed. These complexes respond to a number of requirements such as low cost and low toxicity,.

The hydroformylation reaction consists of reacting an olefinic compound with a mixture of carbon monoxide (CO) and
hydrogen (H2) under pressure. It is currently one of the best examples of homogeneous catalysis by the catalytic
activation transition metals (Rh, Co) on an industrial scale. In this context, it has been shown on a laboratory scale
that the reduction of CO2 can be coupled to the hydroformylation reaction to produce aldehydes, basis reagents for the
preparation of alcohols, esters, acids, amines... Thus, this fundamental research project is to combine the reduction of
CO2 to CO and other catalytic processes. The ultimate goal is to replace the CO with CO2 by developing new efficient
molecular catalysts, based on metallic complexes, which may open new ways for catalysis. The approach followed in
this project has consisted of evaluating the performance of catalytic reduction processes with new molecules such as
metallic complexes as catalyst, on a laboratory scale.

The first major result demonstrates that an osmium photocatalyst is successful for the photoreduction of CO2. This
photocatalyst has a similar activity and better stability than the well-known equivalent derivatives of rhenium (rare
metal). We have also developed metal molecular catalysts based on iron, nickel, manganese ...). The second major result
concerns the development of a Mn catalyst (the third most abundant transition metal in the Earth's crust) for which
the electroreduction of CO2 at a reasonable overvoltage is selective and efficient.

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4 articles have been published; one of which concern both partners. The results were presented at international and
national conferences, during different workshops and seminars.

Project coordinator

Monsieur Alain DERONZIER (UNIVERSITE GRENOBLE I [Joseph Fourier])

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

UNIVERSITE GRENOBLE I [Joseph Fourier]

Help of the ANR 225,094 euros
Beginning and duration of the scientific project: - 36 Months

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