Heterogeneous and catalytic uptake of ozone on mineral oxides and dusts: A Knudsen cell investigation
Heterogeneous and catalytic uptake of ozone on mineral oxides and dusts: A Knudsen cell investigation
复制标题
DOI：
10.1029/2002gl014896
复制
发表时间：
2002-07
影响因子：
5.2
通讯作者：
A. E. Michel;C. Usher;Vicki H. Grassian
中科院分区：
文献类型：
--
作者：
A. E. Michel;C. Usher;Vicki H. Grassian
在温度为296K时，用克努森小室装置研究了α-Al_2O_3、α-Fe_2O_3、SiO_2、中国黄土和撒哈拉沙漠沙等矿物粉末对臭氧的吸收。测定了不同颗粒的反应吸收系数，γ比表面积分别为8±5×10−5、1.8±0.7×10−4和5±3×10−5。中国黄土和撒哈拉沙土的γBET值分别为2.7±0.9×10−5和6±3×10−5。撒哈拉沙子的反应性随着样品处理的不同而变化。在本研究的条件下，臭氧的异相吸收是催化的，并导致臭氧的破坏。
The uptake of ozone on various mineral powders has been studied using a Knudsen cell apparatus at T = 296 K. Samples included α‐Al2O3, α‐Fe2O3, SiO2, China loess and Saharan sand. Reactive uptake coefficients, γBET, were measured for the various particles and found to be 8 ± 5 × 10−5 for α‐Al2O3, 1.8 ± 0.7 × 10−4 for α‐Fe2O3 and 5 ± 3 × 10−5 for SiO2. The authentic dust samples were found to have γBET values of 2.7 ± 0.9 × 10−5 for China loess and 6 ± 3 × 10−5 for Saharan sand. Variations in the reactivity of the Saharan sand were observed as a function of sample treatment. Under the conditions of this study, heterogeneous uptake of ozone is catalytic and results in the destruction of ozone.