Matsuda H, Ito T, Kuchar D, Tanahashi N, Watanabe C
Department of Energy Engineering and Science, Nagoya University, Nagoya, Japan.
Chemosphere. 2009 Mar;74(10):1348-53. doi: 10.1016/j.chemosphere.2008.11.029. Epub 2008 Dec 19.
The dechlorination of C(6)H(5)Cl and the in situ dry sorption of Cl-compounds produced by C(6)H(5)Cl decomposition in an alkaline sorbent of CaO or Na(2)CO(3) incorporated with Fe(2)O(3) were studied. A sample gas containing C(6)H(5)Cl at an initial concentration of 500 ppm balanced by either N(2), O(2) (5%)-N(2) or H(2)O (10%)-N(2) carrier gas was introduced into a lab-scale quartz tube reactor where CaO or Na(2)CO(3) sorbent was packed with Fe(2)O(3). Subsequently, the effect of Fe(2)O(3) addition to CaO or Na(2)CO(3) on the removal of C(6)H(5)Cl, achieved by the decomposition of C(6)H(5)Cl as well as the dry sorption of Cl-compounds produced by C(6)H(5)Cl decomposition, was investigated. It was found that the decomposition of C(6)H(5)Cl in CaO or Na(2)CO(3) sorbent bed incorporated with Fe(2)O(3) occurred in the lower temperatures, compared to the case when only CaO or Na(2)CO(3) sorbent bed was used. Thus, Fe(2)O(3) was found to play a catalytic role in the oxidative decomposition of C(6)H(5)Cl. Further, the decomposition of C(6)H(5)Cl in a bed containing only Fe(2)O(3) was promoted by the presence of O(2) and H(2)O in the reaction atmosphere. Moreover, a higher amount of Cl was absorbed in the combined CaO/Fe(2)O(3) and Na(2)CO(3)/Fe(2)O(3) beds, compared to the absorption of Cl-compounds in only CaO or Na(2)CO(3) sorbent bed. Finally, the comparison of CaO and Na(2)CO(3) sorbents showed that the decomposition of C(6)H(5)Cl and the in situ dry sorption of the resultant Cl-compounds in the combined Na(2)CO(3) and Fe(2)O(3) beds were higher than those in the combined CaO and Fe(2)O(3) beds.
研究了在含有Fe₂O₃的CaO或Na₂CO₃碱性吸附剂中C₆H₅Cl的脱氯以及C₆H₅Cl分解产生的Cl化合物的原位干法吸附。将初始浓度为500 ppm的含C₆H₅Cl的样气，用N₂、O₂（5%）-N₂或H₂O（10%）-N₂载气平衡后，引入装有CaO或Na₂CO₃吸附剂并掺有Fe₂O₃的实验室规模石英管反应器中。随后，研究了向CaO或Na₂CO₃中添加Fe₂O₃对通过C₆H₅Cl分解以及C₆H₅Cl分解产生的Cl化合物的干法吸附来去除C₆H₅Cl的影响。结果发现，与仅使用CaO或Na₂CO₃吸附剂床的情况相比，在掺有Fe₂O₃的CaO或Na₂CO₃吸附剂床中，C₆H₅Cl的分解发生在较低温度下。因此，发现Fe₂O₃在C₆H₅Cl的氧化分解中起催化作用。此外，反应气氛中O₂和H₂O的存在促进了仅含Fe₂O₃床中C₆H₅Cl的分解。而且，与仅在CaO或Na₂CO₃吸附剂床中吸收Cl化合物相比，在CaO/Fe₂O₃和Na₂CO₃/Fe₂O₃组合床中吸收的Cl量更高。最后，CaO和Na₂CO₃吸附剂的比较表明，在Na₂CO₃和Fe₂O₃组合床中C₆H₅Cl的分解以及所得Cl化合物的原位干法吸附高于CaO和Fe₂O₃组合床中的情况。
