文献类型：期刊文献

英文题名：Influence mechanism of alkali and alkaline earth metals on red mud catalysts for the catalytic oxidation of toluene

作者：Fang, Hongping Liang, Wenjun Ma, Liangang Teng, Chenzi Tang, Dandan Nie, Yuling

第一作者：方宏萍

通信作者：Fang, HP[1];Liang, WJ[2]|[1444027a44af256bec423]方宏萍;[1444077a977c82fe79506]方宏萍;

机构：[1]Guizhou Inst Technol, Guiyang 550025, Peoples R China;[2]Beijing Univ Technol, Key Lab Beijing Reg Air Pollut Control, Beijing 100124, Peoples R China;[3]Beijing Acad Sci & Technol, Beijing 100089, Peoples R China

第一机构：贵州理工学院

通信机构：corresponding author), Guizhou Inst Technol, Guiyang 550025, Peoples R China;corresponding author), Beijing Univ Technol, Key Lab Beijing Reg Air Pollut Control, Beijing 100124, Peoples R China.|贵州理工学院;

年份：2026

卷号：714

外文期刊名：APPLIED CATALYSIS A-GENERAL

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001687551900001)】；

基金：Financial support for this project was provided by Guizhou Provincial Basic Research Program (Natural Science) (No. qiankehejichu-ZK [2024] yiban 518) , the High-level Talent Research Start-up Project of Guizhou Institute of Technology (2025GCC030) , National Natural Science Foundation of China (No. 22378008) , National Natural Science Foundation of China (No. 22406033) , National Natural Science Foundation of China (No. 52204200) and Academic New Talents Cultivation and Innovation Project of Guizhou Institute of Technology (No. GZLGXM-28) .

语种：英文

外文关键词：Catalytic oxidation; Volatile organic compounds; Red mud; Physical poisoning; Chemical poisoning

摘要：The poisoning effects of alkali metals (Na, K) and alkaline earth metals (Ca, Mg) on the catalytic performance of 25 % Fe-Al2O3 simulated red mud catalysts were systematically investigated. The impregnation method was used to prepare the catalysts and evaluate them in toluene oxidation reactions. The introduction of these metals resulted in a modest decline in catalytic activity, with the degree of poisoning generally following the order K > Na > Ca > Mg. Catalyst deactivation was attributed to the combined influence of physical and chemical effects. Physical deactivation was associated with metal-induced structural modifications, leading to reductions in surface area and pore volume. In contrast, chemical deactivation arose from changes in surface acidity, inhibition of the Fe2+/Fe3+ redox cycle, and a decrease in oxygen vacancy concentration. In particular, the presence of Na and Ca caused pronounced suppression of red mud activity. Consequently, for the effective utilisation of red mud as a catalyst, it is essential to minimise the contents of Na and Ca while appropriately adjusting surface acidity to optimise the catalytic performance of the active Fe(2)O(3 )component.