Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Sichuan, 610064, Chengdu, China.
Institute of New Energy and Low-Carbon Technology, Sichuan University, Sichuan, 610064, Chengdu, China.
Environ Sci Pollut Res Int. 2022 Jun;29(29):44324-44334. doi: 10.1007/s11356-021-18261-0. Epub 2022 Feb 7.
The effects of calcined temperature on the properties and ozone decomposition activity of manganese oxide catalysts were investigated under high-humidity, low ozone conditions. An outstanding manganese-based catalyst (MnO (260 ℃)) was prepared, which could decompose above 90% (RH = 0%) and 70% (RH = 90%) ozone after 6 h using. Specific characterization showed MnO (260 ℃) had excellent properties. XRD results showed MnO (260 ℃) was mainly MnO and partially MnO. TEM indicated MnO (260 ℃) exposed highly active crystal family plan MnO (110), and the lattice fringes of MnO (110) and MnO (103) overlapped. In situ DRIFT showed hydroxyl groups adsorbed on MnO (260 ℃) were removed, which is beneficial to inhibiting the inactivation caused by surface water accumulation. O-TPD results proven MnO (260 ℃) had good oxygen migration ability. XPS results manifested that MnO (260 ℃) had the most adsorbed oxygen. In short, when the calcination temperature is appropriate, MnO (260 ℃) has coexisted multiple phases, exposed high active crystal family plan and removed surface hydroxyl, which is conducive to the exposure of oxygen vacancies and the inhibition of deactivation.
研究了煅烧温度对高湿度、低臭氧条件下锰氧化物催化剂性能和臭氧分解活性的影响。制备了一种出色的基于锰的催化剂（MnO（260℃）），在 6 小时后可分解超过 90%（RH=0%）和 70%（RH=90%）的臭氧。具体特征表明，MnO（260℃）具有优异的性能。XRD 结果表明，MnO（260℃）主要为 MnO 且部分为 MnO。TEM 表明，MnO（260℃）暴露了高活性晶族平面 MnO（110），MnO（110）和 MnO（103）的晶格条纹重叠。原位 DRIFT 表明，吸附在 MnO（260℃）上的羟基被去除，这有利于抑制由于表面水积聚而引起的失活。O-TPD 结果证明 MnO（260℃）具有良好的氧迁移能力。XPS 结果表明，MnO（260℃）具有最多的吸附氧。总之，当煅烧温度适当时，MnO（260℃）共存多种相，暴露了高活性晶族平面并去除了表面羟基，这有利于氧空位的暴露和失活的抑制。
