In situ alternative switching between Ti⁴⁺and Ti³⁺driven by H₂O₂in TiO₂nanostructures: mechanism of pseudo-Fenton reaction

Abstract

The pseudo-Fenton reaction driven by in situ alternative switching between Ti4+ and Ti3+ driven by H2O2 in TiO2 nanostructures.

Impact of iron and hydrogen peroxide on membrane degradation for polymer electrolyte membrane water electrolysis: Computational and experimental investigation on fluoride emission

“…They may stem for example from the membrane manufacturing process or the feed water that may not be purified perfectly. Furthermore, it has been shown in the literature that Fe 2+ may be replaced by other Fenton-like metal catalysts to produce HO • radicals, including titanium [26,27]. In the case of a PEM WE cell, titanium is the state of the art material for anodic components such as the bipolar plates.…”

Uncalcined TS‐2 immobilized Au nanoparticles as a bifunctional catalyst to boost direct propylene epoxidation with H2 and O2

“…This could be understood by the fact that the TS‐2‐B is formed by an orientated attachment of small sized crystalline (Figure e) and thus the presence of more defects. The Ti 4+ species are known to be the key to form active TiOOH intermediates and thus more targeted PO product, while the defective Ti 3+ species are suggested to be active for H 2 O 2 activation to form peroxide radicals, which may serve as strong oxidant agents to efficiently eliminate the precursor of hard cokes and thus suppress the formation of hard cokes . This could be supported by the phenomena that the Au/TS‐2‐B catalyst exhibits much higher selectivity to CO 2 than the Au/TS‐1‐B catalyst, and the former catalyst does not show the obvious presence of hard cokes.…”

“…For the above used titanium silicates, the isolated Ti 4+ sites are mainly responsible for the PO formation, but their acidic characteristic has a detrimental effect on the PO selectivity, promoting PO ring‐opening side reaction to generate carbonaceous deposits and causing gradual catalyst deactivation . In addition to the isolated Ti 4+ sites, another Ti species, that is, the defective Ti 3+ sites, are also observed, which are suggested to be active for H 2 O 2 activation to generate hydroxyl radicals and superoxo species which can enhance the elimination of the carbonaceous deposits . This indicates the significant importance of employing titanium silicates with appropriate composition and properties of Ti species for development of highly stable yet active Au–Ti bifunctional catalysts for the reaction.…”

Influence of β-Carotene and Lycopene on Oxidation of Ethyl Linoleate in One- and Disperse-Phased Model Systems

“…43 The release of HO • via Fenton-like reactions was not expected for the given experimental setup with respect to the literature. 44,45 The transfer rate from the aqueous phase into the fatty phase was determined by rubrene assay, as described by Kim et al, with some modifications. 46 Fat-soluble rubrene is oxidized to rubrene endoperoxide during interaction with singlet oxygen, which results in loss of the orange color measured at 522 nm.…”