中文摘要：

通过固定床吸附实验,在130℃温度下模拟研究燃煤烟气组分在椰壳活性炭（CS-AC）表面吸附气态元素汞（Hg^0）过程中的作用与影响,揭示模拟烟气组分、Hg^0以及活性炭表面三者间的均相、异相氧化反应特性。实验研究了CS-AC在N2和模拟烟气气氛下对Hg^0的吸附,模拟烟气组分与Hg^0间的均相氧化反应,以及吸附模拟烟气组分后CS-AC在N2气氛下对Hg^0的吸附。研究表明在N2气氛下CS-AC对Hg^0不具备物理吸附的能力,而在模拟烟气组分下CS-AC对Hg^0具有较强的吸附能力,初始吸附效率达80%。仅在模拟烟气均相反应作用下,大约只有14%的Hg^0被氧化为Hg2＋。经过预先跟常规模拟烟气吸附反应,CS-AC表面具备一定氧化性化学元素基团（如NOx）后,能够在N2气氛下对Hg^0进行化学吸附,初始吸附效率达67%左右。可以认为模拟烟气和Hg^0两者间的均相作用不是促进CS-AC在模拟烟气组分下对Hg^0具有较强的吸附能力的主因。活性炭吸附Hg^0的过程中,活性炭表面在烟气组分氧化Hg^0的过程中起到了积极的促进作用。无论在N2气氛下,还是在模拟烟气下,CS-AC吸附Hg^0是气氛中氧化性组分、Hg^0和活性炭表面三者间的异相化学氧化吸附反应过程。

英文摘要：

The role and effect of simulated flue gas on adsorption of elemental mercury（Hg^0）on coconut shell activated carbon（CS-AC）were studied by adsorption experiment carried out at 130℃ in a bench-scale fixed bed to reveal the characteristics of homogeneous/heterogeneous oxidation reaction between components of simulated flue gas,Hg^0 and CS-AS surface.The experiments were divided into three parts：first,adsorption of Hg^0 on surface of CS-AC in nitrogen（N2）gas and simulated flue gas;second,homogeneous oxidation reaction between the components of simulated flue gas and Hg^0;and third,adsorption of Hg^0 in N2 gas on surface of CS-AC pre-adsorbed by simulated flue gas.The results showedthat CS-AC can not adsorb Hg^0 in N2 gas,however,it became easy in simulated flue gas and the initial adsorption efficiency was up to 80%.According to the result of homogeneous reaction between the simulated flue gas and Hg^0 at the temperature of 130℃,only about 14% of Hg^0 can be oxidized to divalent mercury（Hg2＋）which is easily adsorbed by CS-AC,which was much lower than 80% of initial Hg^0 adsorption efficiency in the simulated flue gas.This result could indicate that homogeneous reaction between simulated flue gas and Hg^0 was not the main reason of high Hg^0 adsorption efficiency.It was very interesting that in N2 gas Hg^0 could be adsorbed by CS-AC if it was pre-treated with simulated flue gas without Hg^0.The pre-adsorption process of simulated flue gas could fix some components in flue gas,such as NOx,etc.,on surface of CS-AC,and these components would help adsorption of Hg^0 in N2 gas,and the initial adsorption efficiency was about 67%.During the oxidation adsorption process,surface of CS-AC played important role.Therefore,it could be thought that the adsorption process of Hg^0 by CS-AC is a heterogeneous chemical oxidation reaction and adsorption process between oxidizing components in flue gas,element mercury Hg^0 and the CS-AC＇s surface,whatever in N2 gas or in simulated flue gas.