分子筛对二氧化碳的穿透吸附性能测定

PENETRATING ADSORPTION PROPERTY OF CARBON DIOXIDE FOR ZEOLITES

以4A、5A、13X和NaY分子筛作为吸附剂,在303 K、0.1 MPa条件下,通过吸附穿透实验法考察了分子筛对单组分CO_(2)和CO_(2)/CH_(4)混合气的穿透吸附性能,其中13X分子筛吸附剂对CO_(2)穿透吸附量最大,分别为2.65 mmol/g和0.32 mmol/g。对于CO_(2)/CH_(4)体系,CO_(2)及CH_(4)分子存在竞争吸附,且CO_(2)穿透吸附容量明显高于CH_(4)。此外,分子筛对CO_(2)/CH_(4)混合气体系中CO_(2)的吸附容量低于对单组分体系。此外,5%(质量分数)分子筛对CO_(2)/CH_(4)的吸附性能考察表明,水分对CO_(2)的吸附性能有较大影响,且5A分子筛降低最明显,穿透时间t_(f)由25 min降低至3 min,穿透吸附量q_(i)由0.301 mmol/g降低至0.036 mmol/g。

The penetrating adsorption performance of CO_(2) and CO_(2)/CH_(4) on four zeolites(4A,5A,13X and NaY zeolites)was determined,and the adsorption capacity of CO_(2) on 13X zeolite is the best(2.65 mmol/g,0.325 mmol/g).In the CO_(2)/CH_(4) gas mixture system,there is a competitive adsorption between CO_(2) and CH_(4) molecules,and the adsorption capacity of CO_(2) is significantly higher than that of CH_(4).In addition,the CO_(2)/CH_(4) gas mixture system has a lower adsorption capacity for CO_(2) than the pure CO_(2) system.By measuring the adsorption capacity of 5%zeolite,we concluded that water has a significant effect on the adsorption capacity of CO_(2),and the most significant decrease in the adsorption capacity of CO_(2) is the 5A zeolite(t_(f) from 25 min to 3 min,q_(i) from 0.301 mmol/g to 0.036 mmol/g at 303 K and 0.1 MPa).