Magnetic field assisted enhancement of electronic metal-support interactions in FexCuy@TiO2-δ catalysts for arsine catalytic oxidation

The auxiliary catalysis techniques of energy conservation and environmentally friendly are novel approach in gaseous arsenic emission control. Nowadays, thermal catalysis assisted by magnetic field has become a promising strategy. A series of Ti-based catalysts with different proportions of Fe and Cu was devoted to magnetic-field-assisted arsine (AsH3) catalytic oxidation, and revealed distinct negative and positive magnetic responses (NMFE and PMFE). Under a magnetic field of 0.15 T, the T90% for Fe5Cu5 catalyst was extended from 24 h to 37 h at 100 °C. Characterizing the FexCuy@TiO2-δ catalysts and density function theory (DFT) calculation verified the novel magnetic response derived from the metal–support interaction (MSI) of Cu and Ti, which was a magnetically stimulated electronic metal–support interaction (EMSI) that occurred due to Cu anchoring effect of Fe. In situ diffuse reflectance fourier transform infrared spectroscopy (in situ DRIFTS) was used to propose two different AsH3 reaction pathways related to NMFE and PMFE. It provided theoretical guidance for the application of magnetic fields in gaseous pollutants treatment.