Fig. 4: In situ SEIRAS spectrum and proposed reaction pathways of CO2 to each product. | Nature Catalysis

Fig. 4: In situ SEIRAS spectrum and proposed reaction pathways of CO2 to each product.

From: Selective formaldehyde condensation on phosphorus-rich copper catalyst to produce liquid C3+ chemicals in electrocatalytic CO2 reduction

Fig. 4

a–d, HCOOad (a), HCOad (b), OCH3ad (c) and OC2H5ad (d) intermediates identified by in situ SEIRAS, related to the formaldehyde condensation reaction as a C–C coupling process. e, Proposed reaction pathways to various products, with colour coding for carbon chain length: C1 (purple/red), C2 (blue) C3 (green), C4 (orange).

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