Ce-doped LaMnO3 catalyst and preparation method thereof

Abstract

The invention belongs to the field of VOC degradation, and particularly relates to a Z-type La1-xCexMnO3 catalyst used for photothermal degradation of toluene. According to the Ce-doped LaMnO3 catalyst and a preparation method thereof, a series of Ce-doped LaMnO3(La1-xCexMnO3) is prepared by adopting a sol-gel method and is subjected to gaseous toluene oxidation test in order to study the effect of Ce doping in LaMnO3 on the activity of LaMnO3 under photothermal conditions. The Ce-doped LaMnO3 can form the coexistence of the La1-xCexMnO3 and CeO2, the reaction of CeO2 / La1-xCexMnO3 under the photothermal condition follows the Mars-van Krevelen redox cycle mechanism, the prepared CeO2 / La1-xCexMnO3 can form an efficient Z-Scheme heterojunction, and the electron transfer speed of the catalystin a high-temperature region can be improved. Moreover, in photothermal catalytic degradation, lattice oxygen is the most important active substance, and the lattice oxygen content of perovskite and the reaction activity can be increased by doping a small amount of cerium doping. The optical and thermal activity are enhanced by the Ce doped LaMnO3 perovskite and the Ce-doped LaMnO3 catalyst is a promising catalyst.

Description

technical field [0001] The invention belongs to the field of catalytic degradation of volatile organic compounds, in particular to a direct z-type heterojunction catalyst for photothermal degradation of toluene. Background technique [0002] Volatile organic compounds (VOCs) are organic gases with high vapor pressure and low water solubility. VOCs are considered to be one of the main causes of air pollution since they may be precursors to the formation of ozone and photochemical smog. Among the most common and toxic non-halogenated compounds, formaldehyde, benzene, carbon monoxide, toluene, propylene, phenol, acetone and styrene are of concern. Among them, toluene, which is used in large quantities as a solvent, and high-octane gasoline additives are important raw materials for organic chemicals. A series of intermediates derived from toluene are widely used in the production of fine chemicals such as dyes, drugs, pesticides, explosives, auxiliaries, spices, etc., and are ...

AI Technical Summary

Problems solved by technology

Unfortunately, during the application and later stages of these synthetic materials, toluene is inevitably released into the atmosphere, and prolonged human exposure to this environment can cause severe neurotoxic, hematological, cytogenetic, and carcinogenic effects

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