尖晶石
烧结
材料科学
化学工程
钙钛矿(结构)
冶金
催化作用
热稳定性
矿物学
化学
生物化学
工程类
作者
Wenxiang Tang,Chi Zhang,Yijia Cao,Fangyuan Liu,J. Weng,Xingxu Lu,Yanliu Dang,Chang‐Yong Nam,Steven L. Suib,Pu‐Xian Gao
标识
DOI:10.1016/j.cej.2023.147073
摘要
Non-precious metal oxides have great potential in catalytic deep oxidation of emitted hydrocarbons to address serious environmental concerns. However, sintering issue become a stumbling block in practical application within long-term high-temperature operation or thermal shock. Herein, La was applied to modify Mn1.5Co1.5O4 spinel to get a highly active oxidation catalyst with exceptional stability against high-temperature thermal ageing treatment. With thermal ageing at 750 °C for 100 h, the La modified Mn–Co composite reached 90 % conversion in toluene oxidation at 265 °C under the high WHSV of 120,000 mL g−1 h−1, while this value increased to 312 °C over blank Mn–Co spinel. The addition of La not only inhibited the crystal growth of spinel nanocrystals, but also brought about perovskite formation through sintering, generating perovskite-spinel interfaces, thus enhancing both activity and stability. Meanwhile, the La modified Mn–Co spinel exhibited superior performance in presence of water or sulfur dioxide after thermal ageing treatment. This work offers a versatile strategy to design anti-sintering and active oxidation nanocatalysts based on non-precious metal oxides for industrial applications.
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