Hg Reactions in the Presence of Chlorine Species: Homogeneous Gas Phase and Heterogeneous Gas-Solid Phase
Hg Reactions in the Presence of Chlorine Species: Homogeneous Gas Phase and Heterogeneous Gas-Solid Phase
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DOI：
10.1080/10473289.2002.10470863
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发表时间：
2002-11
影响因子：
2.7
通讯作者：
T. Lee;E. Hedrick;P. Biswas
中科院分区：
文献类型：
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作者：
T. Lee;E. Hedrick;P. Biswas
摘要采用带在线汞分析仪的流动反应系统和冲击进样装置，研究了氯化汞的氯化动力学。根据简单的总反应路径估算了反应级数(α)、总速率常数(k‘)和活化能(Ea)等动力学参数。其反应级数分别为1.55，5.07×10~(-2)exp(-1939.68/T)[(μg/m~3)-0.55(S)~(-1)]和16.13[kJ/m o l]。还考察了氯物种(HCl、CH2Cl2)对以前发展的汞原位捕捉法的影响。在有氯物种存在的情况下，该原位捕捉法对汞的捕获率高于98%。此外，在一定条件下，氯的存在促进了额外的气相氧化去除元素汞。
Abstract The kinetics of Hg chlorination (with HCl) was studied using a flow reactor system with an online Hg analyzer, and speciation sampling using a set of impingers. Kinetic parameters, such as reaction order (α), overall rate constant (k′ ), and activation energy (E a), were estimated based on the simple overall reaction pathway. The reaction order with respect to C Hg, k′, and E a were found to be 1.55, 5.07 x 10-2exp(-1939.68/T) [(μg/m3)-0.55(s)-1], and 16.13 [kJ/mol], respectively. The effect of chlorine species (HCl, CH2Cl2) on the in situ Hg capture method previously de-veloped28 was also investigated. The efficiency of capture of Hg by this in situ method was higher than 98% in the presence of chlorine species. Furthermore, under certain conditions, the presence of chlorine enhanced the removal of elemental Hg by additional gas-phase oxidation.