The decarboxylation of bio-derived fatty acids provides a sustainable pathway for the production of alkane products under mild conditions; however, products are generally obtained in low selectivity due to the uncontrollable reactivity of radical intermediates. Here we demonstrate that photogenerated radicals can be rapidly terminated by surface hydrogen species during photocatalytic decarboxylation of fatty acids on a hydrogen-rich surface that is constructed by the interactions between H2 and Pt/TiO2 catalyst, thereby greatly inhibiting oligomerization; Cn–1 alkanes can therefore be obtained from bio-derived C12–C18 fatty acids in high yields (≥90%) under mild conditions (30 °C, H2 pressure ≤0.2 MPa) and 365 nm light-emitting dode irradiation. Industrial low-value fatty acid mixtures (namely, soybean and tall oil fatty acids) can be transformed into alkane products in high yields (up to 95%). Our research introduces an efficient biomass-upgrading approach that is enabled by subtle control of the radical intermediate conversion on a heterogeneous surface.
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The data that support the plots within this paper and other findings of this study are available from the corresponding author on reasonable request.
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This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (grant no. XDB17000000) and the National Natural Science Foundation of China (grant nos. 21721004, 21690082, 21690084, 21690080, 21711530020).
The authors declare no competing interests.
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Huang, Z., Zhao, Z., Zhang, C. et al. Enhanced photocatalytic alkane production from fatty acid decarboxylation via inhibition of radical oligomerization. Nat Catal 3, 170–178 (2020). https://doi.org/10.1038/s41929-020-0423-3
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