Polyoxometalate-based single-atom catalysts for benzyl alcohol photooxidation
Benzaldehyde(BnCHO)is a key component in dye production and a fundamental substance in the fine chemical sector,especially for making medicines and flavorings.Under ambient conditions,the synthesis of BnCHO through the photo-oxidation of benzyl alcohol(BnOH)demonstrates significant ap-plication potential in fine chemical synthesis.Herein,we anchored different metal cations(M=Fe,Co,Cu,and Zn)into monolacunary polyoxometalate(POM)[SiW11O39]8-(SiW)to form single-metal substi-tuted-POMs(MSiWs).Furthermore,we have successfully dispersed these POMs uniformly onto poly-meric carbon nitride nanosheets(CN).For BnOH photooxidation without adding extra oxidants such as H2O2,the FeSiW/CN-7 exhibited excellent photocatalytic performance with the conversion of BnOH near-ly 69.17％and a BnCHO yield of 532.13 mmol·g-1 within 12 h.The photo-oxidation performance of BnOH is 76 and 5 times higher than that of single CN and FeSiW,respectively.This catalytic system can maintain a high catalytic efficiency after 5 cycles,indicating that FeSiW/CN possesses high catalytic stabil-ity.The results suggest that the designed POM-based single-atom catalyst FeSiW/CN is a promising can-didate for the preparation of BnCHO through photooxidation under mild conditions.
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