Toluene removal by sequential adsorption-plasma catalytic process: Effects of Ag and Mn impregnation sequence on Ag-Mn/gamma-Al2O3
Toluene removal by sequential adsorption-plasma catalytic process: Effects of Ag and Mn impregnation sequence on Ag-Mn/gamma-Al2O3
复制标题
顺序吸附等离子体催化工艺去除甲苯：Ag 和 Mn 浸渍顺序对 Ag-Mn/gamma-Al2O3 的影响
DOI：
10.1016/j.chemosphere.2016.07.085
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发表时间：
2016
期刊：
影响因子：
8.8
通讯作者：
Kang Zhongli
中科院分区：
文献类型：
--
作者：
Qin Caihong;Huang Xuemin;Dang Xiaoqing;Huang Jiayu;Teng Jingjing;Kang Zhongli
A series of Ag-Mn/γ-Al2O3were 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)/γ-Al2O3, had longer breakthrough time, gave less emission of toluene, had higher CO2selectivity, and had better carbon balance and COxyield compared to catalysts prepared via other impregnation sequences. After 120 min of NTP treatment, the carbon balance of Ag-Mn(F)/γ-Al2O3was 91%, with 87% as COxcontributions. A Brunauer–Emmett–Teller (BET) analysis and X-ray photoelectron spectroscopy (XPS) results show that, the impregnation sequence impacts the BET surface area and the ratio and existing state of Ag on the surface of the catalysts. The longer breakthrough time when using Ag-Mn(F)/γ-Al2O3as catalyst is attributed to the large amount of Ag+on the surface. Ag+is a new active site for toluene adsorption. When Ag was impregnated first (Ag(F)-Mn/γ-Al2O3) or Ag and Mn co-impregnated (Ag-Mn-C/γ-Al2O3), the predominant specie was Ag+. Both Ag0and Ag+species were detected on Ag-Mn(F)/γ-Al2O3. Ag0cooperation with MnOxmay promote the migration of surface active oxygen. This would facilitate the oxidation of adsorbed toluene with Cdouble bondC bond already weakened by Ag+and would result in higher CO2selectivity and better carbon balance as seen in the Ag-Mn(F)/γ-Al2O3system.
