凹土负载催化剂对模拟烟气中单质汞的吸附

Adsorption of elemental mercury in simulated flue gas by attapulgite supported catalyst

采用浸渍法制备一系列Mo掺杂Mn Ox/凹土催化剂(Mo-Mn-ATP),并经负载Mo/Mn Ox后冻干-焙烧变温致孔处理。采用比表面、孔径分析仪测定催化剂的比表面积、N2吸附-脱附等温线分析和孔径分布;X射线能谱分析仪(EDS)对催化剂成分进行分析。在固定床汞吸附实验台上,进行了凹土负载催化剂脱除模拟烟气中Hg0的实验研究和理论分析。结果表明,制得的Mo/Mn摩尔比1∶3的Mo-Mn-ATP催化剂,在保持凹土原有晶体结构的基础上,随着Mo/Mn Ox负载量的增加,材料的比表面积和孔容减小。10%负载量,反应温度120℃的条件下,含Mo催化剂对Hg0的脱除性能最佳。

A series of molybdenum doped manganese oxide/attapulgite catalyst(Mo-Mn-ATP) were prepared by dipping method and then treated by freeze-drying and variable temperature calcination.The specific surface area,N2adsorption-desorption isotherm and pore-size distribution were characterized by BET.And the elemental composition of catalyst was identified using EDS.A laboratory-scale fixed-bed reactor system was used to study the capability of attapulgite supported catalyst to remove elemental mercury from simulated flue gas.The results showed that,Mo-Mn-ATP with the Mo/Mn molar ratio of 1∶ 3 maintained the original crystal structure of attapulgite,and with the increase of the loading amount,the specific surface area and pore volume decreased.The Mo doped catalyst exhibited the best mercury removal performance under the conditions of 10% of loading amount and 120℃ of reaction temperature.