ZSM-5型分子筛对二氧化硫的动态吸附性能

采用ZSM-5型分子筛吸附脱除烟气中的二氧化硫,分析了其动态吸附过程的基本特性,以及硅铝物质的量比、温度、空速等影响因素.结果表明:ZSM-5型分子筛对二氧化硫的吸附符合Langmuir吸附等温线类型,属于单分子层物理吸附.用硅铝物质的量比为38的ZSM-5型分子筛,在温度为25 ℃、空速为700 h-1、入口二氧化硫体积分数为0.3%条件下,测量吸附饱和时间为180 min,饱和二氧化硫吸附容量为0.018 g/g.温度较低、硅铝物质的量比较小、空速较低的条件下,ZSM-5型分子筛对二氧化硫的吸附性能较好.

Dynamic adsorbing properties of ZSM-5 molecular sieve to sulfur dioxide

Adsorption removal of SO2 in flue gases by ZSM-5 molecular sieve was experimentally investigated,and its basic dynamical characteristics,effects of amount - of - substance ratio of Si to Al (Si/Al),temperature,and space velocity were further analyzed.Results showed that adsorption of SO2 with ZSM-5 molecular sieve accorded with Langmuir equation,belonging to physical monolayer adsorption.With ZSM-5 molecular sieve of n(Si)/n(Al)=38,under the conditions that temperature of 25 ℃,space velocity about 700 h-1,and volume fraction of SO2 in the inlet around 0.3%,the absorption time of saturation was 180 min,and the saturated adsorption capacity was 0.018 g/g.Under the conditions of lower temperature,smaller amount - of - substance ratio of Si to Al,and lower space velocity,adsorbing properties of ZSM-5 molecular sieve to SO2 was better.