Boosting Toluene Combustion by Tuning Electronic Metal–Support Interactions in In Situ Grown Pt@Co₃O₄ Catalysts

Abstract

Electronic metal–support interaction (EMSI) has attracted great attention in volatile organic compound (VOC) abatement. Herein, Pt@Co3O4 catalysts were prepared via a metal–organic framework (MOF) in situ growth approach to boost toluene degradation. The partial electron transfer from Co3O4 to Pt species was induced by the EMSI effect to generate the electron-rich Pt and Co3+ species. The electrophilic O2 molecules could be activated by picking up the electrons from electron-rich Pt species to form nucleophilic oxygen species, which is conducive to attack C–H bonds in toluene. The redox ability and surface oxygen species activity of catalysts were improved due to strong EMSI. As expected, the excellent toluene activity was achieved, meanwhile exhibiting satisfactory water resistance and long-term stability for toluene combustion. In situ diffuse reflectance infrared Fourier transform spectroscopy results elucidated that surface lattice oxygen species should deeply participate in toluene degradation, which could be efficiently replenished by gaseous oxygen. This work may provide a new idea for exploring the relationship between the electron transfer effect and efficient catalytic performance of VOCs.

Stable Black Phosphorus Encapsulation in Porous Mesh-like UiO-66 Promoted Charge Transfer for Photocatalytic Oxidation of Toluene and o-Dichlorobenzene: Performance, Degradation Pathway, and Mechanism

“…Toluene and o -dichlorobenzene, as the representative components of volatile organic compounds (VOCs) and chlorinated VOC (CVOCs), are of great concern because of their carcinogenicity, mutagenicity, and toxicity. − Photocatalytic oxidation (PCO) is a promising technology for gaseous organic contaminants mineralization because of its outstanding oxidation capacity under mild reaction conditions . However, the exploration of photocatalysts with high stability, light-harvesting ability, and efficiency of charge utilization remains a challenge.…”

Chlorine-Coordinated Pd Single Atom Enhanced the Chlorine Resistance for Volatile Organic Compound Degradation: Mechanism Study

“…Recently, a promising method for the preparation of supported noble metal catalysts has been reported via using metal–organic frameworks (MOFs) as the sacrificial templates. − The abundant porous structure of MOFs can restrict the growth of noble metal particles and improve their distributions. For example, Xiao et al prepared Pd NPs@Co 3 O 4 from Pd NPs@ZIF, in which the presence of electron transfer from Co 3 O 4 to Pt species enhanced the activation ability of O 2 , boosting the degradation of toluene . To date, there are many studies focusing on the preparation of supported noble metal catalysts from MOF templates for VOC oxidation.…”

Surface Modification by Amino Group Inducing for Highly Efficient Catalytic Oxidation of Toluene over a Pd/KIT-6 Catalyst

“…The highly dispersed Pd in the 0.5% GR catalyst played an important role in the absorption and activation of O 2 . Meanwhile, surface Pd of the 0.5% GR catalyst is in the electron-rich state (as seen in Figure b), which will facilitate the activation of electrophilic O 2 molecules, thereby generating more reactive oxygen species . Therefore, the higher amount of surface O 2 – ad and O – ad on the GR catalyst is likely due to the combined effect of high dispersion of Pd and the electron-rich state of surface Pd 0 in the 0.5% GR catalyst.…”