Journal of Catalysis, Vol.374, 297-305, 2019
Visible-light-driven selective oxidation of glucose in water with H-ZSM-5 zeolite supported biomimetic photocatalyst
A new iron tetra(2,3-bis(butylthio)maleonitrile)porphyrazine (FePz(SBu)(8)) has been synthesized, then it was loaded on H-ZSM-5 zeolite to obtain a supported biomimetic photocatalyst H-ZSM-5/FePz(SBu)(8). Using H2O2 as oxidant, the photocatalytic selective oxidation of glucose in water under visible light (lambda >= 420 nm) irradiation was carried out in presence of H-ZSM-5/FePz(SBu)(8). Under such conditions, the glucose can be efficiently converted into value-added chemicals such as glucaric acid, gluconic acid, arabinose, glycerol and formic acid. More importantly, in comparison with pure FePz(SBu)(8) and pure HZSM-5 zeolite, the H-ZSM-5/FePz(SBu)(8) exhibited a higher photocatalytic activity for glucose oxidation and the formation of glucaric acid was observed only when H-ZSM-5/FePz(SBu)(8) was used, deriving from the synergistic effect between FePz(SBu)(8) and H-ZSM-5 zeolite. Some reaction parameters of glucose oxidation catalyzed by the H-ZSM-5/FePz(SBu)(8) were discussed, such as loading amount of FePz(SBu)(8), H2O2:glucose ratio, glucose concentration, and so on. It was demonstrated that the Soret-band of FePz (SBu)(8) contributed more to the visible light photocatalytic activity than the Q-band during the photocatalytic process. The stability of H-ZSM-5/FePz(SBu)(8) during the photocatalytic process was further evaluated by the reusability test. In addition, the generation of reactive oxygen species was determined by electron spin resonance (ESR) technology and scavenger experiments. A possible reaction pathway of glucose oxidation was also discussed. (C) 2019 Elsevier Inc. All rights reserved.