硫化氢对活性炭脱除单质汞的影响  

Effect of Hydrogen Sulfur on the Removal of Elemental Mercury with Activated Carbon

作　　者：洪东阳 周劲松[1] 周启昕 HONG Dongyang;ZHOU Jinsong;ZHOU Qixin(State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学能源清洁利用国家重点实验室

出　　处：《应用化学》2019年第10期1194-1201,共8页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(51576173)项目资助~~

摘　　要：H2S是煤气中的含硫成分,活性炭能否催化氧化煤气中的H2S形成活性硫,以促进H2S和Hg^0的协同脱除是值得研究的。本文首先通过程序升温脱附和热力学分析了低温情况下H2S对活性炭脱除Hg^0的影响。在较低吸附温度130℃下,H2S不仅不能作为硫源,还使活性炭对Hg^0的吸附显著减弱,这主要是由于H2S对活性炭表面的吸附氧的消耗以及H2S对含氧官能团的氧的取代反应造成的。在此基础上,进一步研究了高温下H2S对活性炭的影响,高温也不能使活性炭有效渗入单质硫。所以无论低温还是高温情况下,利用H2S作为硫源使Hg^0以HgS的形式脱除并不是活性炭脱汞的可行手段。本文揭示了较宽的温度范围内H2S对单纯的活性炭脱除Hg^0的影响机理,能为用于煤气脱汞的活性炭的设计以及作为负载时机理研究提供支持作用。H2S is a component with sulfur in coal gas and it is worth studying whether activated carbon can catalyze the H2S in coal gas to form active sulfur,so as to promote the synergistic removal of H2S and Hg^0.In this paper,the mechanism of H2S influence on the removal of Hg^0 from activated carbon was analyzed by temperature programmed desorption method and thermodynamics.H2S significantly weakened the adsorption of activated carbon on Hg^0 in low temperature,which may be caused by the consumption of adsorbed oxygen on the surface of activated carbon and the substitution of oxygen in oxygen containing functional groups by H2S.Then the feasibility of H2S in coal gas to remove Hg^0 and H2S in high temperature was discussed.High temperature sulfuration cannot effectively sulfurize activated carbon with active sulfur.Therefore,mercury removal in the form of HgS with H2S as a sulfur source is not a feasible method by activated carbon.The mechanism revealed here in on the influence of H2S on Hg^0 removal from pure activated carbon provides the guidance for designing activated carbon for gas mercury removal.

关 键 词：硫化氢 汞 活性炭 热力学 程序升温脱附 

分 类 号：O647.3[理学—物理化学]