Kinetics of the uptake of SO2 on mineral oxides:: Improved initial uptake coefficients at 298 K from pulsed Knudsen cell experiments

被引：14

作者：

Seisel, S ^{[1
]}

Keil, T ^{[1
]}

Lian, Y ^{[1
]}

Zellner, R ^{[1
]}

机构：

[1] Univ Duisburg Essen, Inst Phys & Theoret Chem, D-45141 Essen, Germany

来源：

INTERNATIONAL JOURNAL OF CHEMICAL KINETICS | 2006年 / 38卷 / 04期

关键词：

D O I：

10.1002/kin.20148

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The uptake Of SO2 on gamma-Fe2O3, gamma-Al2O3, and Saharan dust has been studied at T = 298 K using a Knudsen cell reactor operated in a steady-state as well as in a pulsed mode. The initial uptake coefficients determined in the steady-state mode have been found to be affected by surface saturation as well as bulk diffusion Of SO2 resulting in an apparent dependence of the initial uptake coefficients on the sample mass of the mineral oxides. However, by operating the Knudsen cell in the pulsed mode with shorter response time, these effects could be suppressed. initial uptake coefficients of gamma(ini) (Fe2O3) = (8.8 +/- 0.4) x 10(-2) gamma(ini) (Al2O3) = (7.4 +/- 0.9) x 10(-3), and gamma(ini) (Saharan dust) = (7.6 +/- 0.5) x 10(-2) were derived. This suggests that Fe2O3 is an important component in determining the reactivity of mineral dusts. (c) 2006 Wiley Periodicals, Inc.

引用

页码：242 / 249

页数：8