Selective Photocatalytic CO Reduction in Aerobic Environment by Microporous Pd-porphyrin-based Polymers Coated Hollow TiO
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Direct photocatalytic CO reduction from primary sources, such as flue gas and air, into fuels, is highly desired, but the thermodynamically favored O reduction almost completely impedes this process. Herein, we report on the efficacy of a composite photocatalyst prepared by hyper-crosslinking porphyrin-based polymers on hollow TiO surface and subsequent coordinating with Pd(II). Such composite exhibits high resistance against O inhibition, leading to 12% conversion yield of CO from air after 2-h UV-visible light irradiation. In contrast, the CO reduction over Pd/TiO without the polymer is severely inhibited by the presence of O ( ≥ 0.2 %). This study presents a feasible strategy, building Pd(II) sites into CO-adsorptive polymers on hollow TiO surface, for realizing CO reduction with HO in an aerobic environment by the high CO/O adsorption selectivity of polymers and efficient charge separation for CO reduction and HO oxidation on Pd(II) sites and hollow TiO, respectively.
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