The Effective Conversion Of Co2

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The main challenge of the project is the effective conversion of CO2. If the captured CO2 can’t be converted to fuels in time, the materials will be saturated with CO2 and lose the capacity of CO2 capture. For CO2 conversion, the photocatalytic approach takes priority over others as it only needs the renewable solar energy. Considering that CO¬2 is a very stable and inert compound, there is a risk that the sunlight irradiation is not strong enough to convert the CO2 efficiently. The using of concentrated sunlight and the engineering of photocatalyst materials are two strategies to mitigate the risk.

Moreover, the risk can be spread by the alternative catalytic approach. Catalysis has been proved an efficient way to convert CO2, although extra energy input (high temperature/pressure) is required because of the endothermic CO¬2 conversion. By using the solar-thermal catalytic approach, solar-driven heating is only energy source to maintain the reaction temperature. In addition, the dilute CO2 in the flue gas can be enriched after the bulk capture, which accelerates the subsequent catalytic CO2 conversion. As a result, catalytic reaction can be achieved at moderate pressure (if not atmospheric pressure) with the extra energy input controlled at a low level.

The importance of CO2 capture and CO2 conversion is evidenced by the great research interest (~ 79,000 and ~ 52,000 publication record, respectively). However, the high operational and infrastructure cost is the
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