摘要
利用努森池反应器研究了过氧化氢与大气矿质氧化物的非均相过程，其初始摄取系数分别为（1．00±0．11）×10^-4（α-A12O3）、（1．66±0．23）×10^-4（MgO）、（5．22±0．9）×10^-5（SiO2）、（9．70±1.95）×10^-5（Fe2O3）．除SiO2外，其他氧化物表现出一定催化分解过氧化氢的能力．研究表明过氧化氢在矿物表面的非均相过程是其大气消除的藿要途径，对其大气寿命具有重要影响．
The interaction of mineral oxides （α-A12O3, MgO, Fe2O3, and SiO2） with hydrogen peroxide was investigated using the Knudsen cell reactor. The initial reactive uptake coefficients for tile commercially available powders are measured as （1.00±0.11）×10-4 for α-A1203, （1.66±0.23）×10-4 for MgO, （9.70±1.95）×10-5 for Fe203, and （5.22±0.9）×10-5 for SiO2. These metal oxide powders exhibit some catalytic behavior toward the decomposition of hydrogen peroxide excluding SiO2. H2O2 can be destroyed on Fe2O3 surface and O2 is formed. The experimental results suggest that the heterogeneous loss on mineral surface can represent an important sink of hydrogen peroxide.
基金
This work was supported by the Knowledge Innovation Program of the Chinese Academy of Sciences （No.KJCX2-YW-N24, No.KZCX2-YW-Q02-03）
the National Basic Research Program of China of Ministry of Science and Technology of China （No.2011CB403401）
and the National Natural＇ Science Foundation of China （No.40925016, No.40830101, No.21077109, and No.41005070）.
关键词
动力学
非均相过程
光氧化氢
大气寿命
Kinetics
Hydrogen peroxide
Heterogeneous uptake
Atmospheric lifetime
