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A two-step solar thermochemical CO2

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A two-step solar thermochemical CO 2 -splitting cycle using Zn/ZnO redox reactions

1 - K

298

2 2 1

mol kJ

H 350

O Zn ZnO

= +

o

Net reaction Solar step:

Non-solar step:

Maximum solar-to-

chemical efficiency of 39%

1 - K

298 2

mol kJ 68 - H

CO ZnO CO

Zn

=

+ +

o

2 2 1

2

CO O

CO

+

• Gálvez et al., Energy & Fuels 5 (2008) 3544–3550

• Loutzenhiser et al., Energy & Fuels 23 (2009) 2832-2839

2

State-of-the-art reactor technologies

Solar reactor CO

2

-reduction reactor

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