Toluene removal by sequential adsorption-plasma catalytic process:Effects of Ag and Mn impregnation sequence on Ag-Mn/γ-Al2O3

Release time:2024-08-09  Hits:

• Affiliation of Author(s):环境与市政工程学院
• Journal:Chemosphere
• Key Words:中文关键字：浸渍顺序；吸附；等离子体催化；甲苯，英文关键字：Impregnation sequence；Adsorption；Plasma catalysis；
• Abstract:A series of Ag-Mn/g-Al2O3 were prepared under different Ag/Mn impregnation sequence and tested in the sequential adsorption-plasma catalytic removal of toluene. When Mn was impregnated first, the resulting catalyst, Ag-Mn(F)/g-Al2O3, had longer breakthrough time, gave less emission of toluene, had higher CO2 selectivity, and had better carbon balance and COx yield compared to catalysts prepared via other impregnation sequences. After 120 min of NTP treatment, the carbon balance of Ag-Mn(F)/g-Al2O3 was 91%, with 87% as COx contributions. A BrunauereEmmetteTeller (BET) analysis and X-ray photoelectron spectroscopy (XPS) results show that, the impregnation sequence impacts the BET surface areaand the ratio and existing state of Ag on the surface of the catalysts. The longer break through time when using Ag-Mn(F)/g-Al2O3 as catalyst is attributed to the large amount of Agþ on the surface. Agþ is a new active site for toluene adsorption. When Ag was impregnated first (Ag(F)-Mn/g-Al2O3) or Ag and Mn coimpregnated (Ag-Mn-C/g-Al2O3), the predominant specie was Agþ. Both Ag0 and Agþ species were detected on Ag-Mn(F)/g-Al2O3. Ag0 cooperation with MnOx may promote the migration of surface active oxygen. This would facilitate the oxidation of adsorbed toluene with C]C bond already weakened by Agþ and would result in higher CO2 selectivity and better carbon balance as seen in the Ag-Mn(F)/gAl2O3 system.
• Note:党小庆 通讯作者
• Co-author:黄家玉,滕晶晶,康忠利
• First Author:黄学敏,dangxiaoqing,qincaihong
• Indexed by:Journal paper
• Volume:卷：162
• Issue:期：
• Page Number:页：125~130
• Translation or Not:no
• Date of Publication:2016-08-01