Tuning the interlayer cations of birnessite-type MnO₂ to enhance its oxidation ability for gaseous benzene with water resistance

Abstract

The Cu–MnO2 catalyst exhibited good resistance to high-temperature deactivation and water poisoning as well as good stability during long-term testing.

Opposite Effects of Co and Cu Dopants on the Catalytic Activities of Birnessite MnO2 Catalyst for Low-Temperature Formaldehyde Oxidation

“…The substitution of Mn by the dopants facilitated the generation of oxygen vacancies and the mobility of lattice oxygen, leading to the generation of more active surface oxygen species. Similar observations were reported for Cu-doped δ-MnO 2 for toluene and benzene oxidation, with significantly lower temperature activities compared to the unmodified δ-MnO 2 , owing to the formation of oxygen vacancies and its resultant effect on low-temperature reducibility and lattice oxygen reactivity. Doping Cu into the octahedra framework of δ-MnO 2 was also shown to reduce the electron-transfer resistance of δ-MnO 2 , thereby enhancing its catalytic activity and stability for oxygen reduction reaction .…”

Recent progresses in the synthesis of MnO2 nanowire and its application in environmental catalysis

“…Besides, the strategies such as metal doping and loading have been investigated to improve the catalytic activities on benzene combustion over MnO 2 . Liu et al 147 found that the Ce 3+ and Cu 2+ doped of MnO 2 nanosheet could significantly improve the activity of MnO 2 for benzene decomposition. For the pristine MnO 2 , benzene was hardly decomposed below 200 °C and only ∼40% conversion was achieved at 400 °C.…”

Synergy of Lithium, Cobalt, and Oxygen Vacancies in Lithium Cobalt Oxide for Airborne Benzene Oxidation: A Concept of Reusing Electronic Wastes for Air Pollutant Removal

“…Although significant progress has been made in benzene oxidation over acid-modified LiCoO 2 catalysts, the activity of the H-LiCo-6 catalyst still needed improving, especially when compared with our previously reported Cu 2+ -exchanged birnessite MnO 2 , which exhibited superior activity over the samples of similar type. Considering how challenging it is to break the refractory chemical bonds of benzene molecule, the H-LiCo-6 sample in this study was still promising for benzene oxidation in the gas phase.…”

“…Benzene is one of the commonly found volatile organic compounds (VOCs) in polluted air, recognized as hazardous contaminant. Due to its “teratogenesis, carcinogenesis, and mutagenesis”, − benzene is posing a serious threat to human health. Moreover, the residual benzene is detected in animals, plants, soil and, bodies of water, and this potential harm will last for generations since benzene is refractory and difficult to decompose .…”