期刊
CHEMOSPHERE
卷 162, 期 -, 页码 125-130出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2016.07.085
关键词
Impregnation sequence; Adsorption; Plasma catalysis; Toluene
资金
- National Natural Science Foundation of China [51408455]
- Key Project of Shaanxi Provincial Science and Technology Innovation [2016TZC-S-19-2]
- Natural Science Foundation of Shaanxi Provincial Department of Education [09JK513]
A series of Ag-Mn/gamma-Al2O3 were prepared under different Ag/Mti impregnation sequence and tested in the sequential adsorption-plasma catalytic removal of toluene. When Mn was impregnated first, the resulting catalyst, Ag-Mn/gamma-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/gamma-Al2O3 was 91%, with 87% as COx contributions. 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/gamma-Al2O3 as 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/gamma-Al2O3) or Ag and Mn co-impregnated (Ag-Mn/gamma-Al2O3), the predominant specie was Ag+. Both Ag-0 and Ag+ species were detected on Ag-Mn/gamma-Al2O3 . Ag-0 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 Ag+ and would result in higher CO2 selectivity and better carbon balance as seen in the Ag-Mn/gamma-Al2O3 system. (C) 2016 Elsevier Ltd. All rights reserved.
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