Simultaneous Removal of SO2 and NOx by Calcium Hydroxide at Low Temperature: Evolution of the Absorbent Surface Structure
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- 作者：Jihui Gao ; Guoqing Chen ; Jiaxun Liu ; Xiaolin Fu ; Jianmin Gao ; Qian Du ; Yukun Qin
- 刊名：Energy & Fuels
- 出版年：2010
- 出版时间：October 21, 2010
- 年：2010
- 卷：24
- 期：10
- 页码：5454-5463
- 全文大小：1272K
- 年卷期：v.24,no.10(October 21, 2010)
- ISSN：1520-5029
文摘
The surface structure characteristics of the absorbent subjected to SO2 and NO2 for different reaction times were measured by using the N2 adsorption method. The pore surface and structure fractal dimensions (D1 and D2) calculated from the N2 adsorption isotherms data were applied to analyze the fractal characteristics of absorbent particles during reactions. On the basis of the measurement results and the reaction mechanism of SO2 and NO2 removal, the evolution mechanism of absorbent surface structure during reactions was discussed. The presence of reaction products on the surface of the absorbent can reshape the pore structure. With the comparison of the evolution of the surface structure in SO2 and NO2 single removal, the interaction of SO2 and NO2 on the absorbent surface has a great effect on the change of surface structure with simultaneous removal of SO2 and NO2. The decrement of the surface structure parameters values is lower than that in both SO2 and NO2 single removal. The change trend of the D1 and D2 can also not be well explained by their changes in SO2 and NO2 single removal. Because of the expansion rate discrepancy of the NO2 removal product and SO2 removal product, the pores from 7 to 30 nm were formed in SO2 and NO2 by simultaneous removal. The homogeneous reaction product and the same expansion rate make the product layer compact in both SO2 and NO2 single removal. On the basis of the analysis of both surface fractal dimension and structure fractal dimensions, it can be concluded that the higher surface fractal dimension as well as an appropriate pore structure fractal dimension D2 will helping in getting higher SO2 and NO2 removal.