摘要
由于活性炭质材料表面性质复杂 ,脱除烟气 SO2 反应的组分多 ,中间步骤及涉及的因素纷杂 ,因此直至现在还没有一种分析方法可以用来探明活性炭质材料脱除烟气 SO2 过程中吸附与反应的确切机理与反应情况 ,以及物质在不断改变的孔隙中的传递情况 .虽然 XPS,IR和TPD等一些仪器被用来研究 SO2 在活性炭质材料上的吸附与转化情况 ,但是实验测定炭质材料吸附转化 SO2 性能仍是常用的方法 .综述了众多学者对碱性炭吸附酸性质及活性炭质材料表面性质 ,尤其是化学性质对其脱硫性能影响的研究 ,并由此得到结论 :H2 O与 O2 大大地改变了活性炭质材料表面性质 ,尤其 H2 O在活性炭质材料吸附转化烟气中 SO2 过程中发挥着重要作用 ,其改变了 SO2
One of the unique advantages of activated carbon based FGD process is that, in addition to SO 2, it removes nearly every impurity found in combustion flue gas, including particulate material, heavy metals, organic materials, and other air toxics. However, until now, no analytical methods are known to determine the true mechanisms of adsorption and reaction accompanied by mass transport within the changing pore system. Indirect knowledge exists about the adsorption and reaction mechanisms from the measurement of gas phase breakthrough curves du ring fixed bed adsorption experiments and from desorption experiments. In the paper, the surface basicity of carbonaceous materials (including active carbon and active coke) is especially reviewed and discussed. From many scholars′ works, it can be proposed that the presence of oxygen and water vapor affects greatly the physicochemical properties of carbon surfaces. In particular, the presence of H 2O plays a positive role on SO 2 adsorption and oxidation on carbon surface.\;
出处
《煤炭转化》
CAS
CSCD
北大核心
2002年第2期29-34,共6页
Coal Conversion
