蜂窝活性炭与沸石分子筛对涂装VOCs废气的吸脱附性能对比

选取工业涂装VOCs废气作为试验对象，以蜂窝活性炭和沸石分子筛为吸附剂，设计固定床小试装置进行VOCs吸脱附试验。结果表明：蜂窝活性炭的碘值、比表面积、总孔容及微孔孔容均大于沸石分子筛，分别是沸石分子筛的1.79,2.93,1.55,2.02倍；相同脱附温度、进气风速条件下，VOCs从蜂窝活性炭表面脱附更容易，其脱附时间远低于沸石分子筛；相同反应条件下，蜂窝活性炭对VOCs的饱和吸附量明显高于沸石分子筛，但沸石分子筛的饱和吸附量受反应温度和VOCs浓度的影响相对较小；循环吸脱附10次后，蜂窝活性炭和沸石分子筛对VOCs的吸附率分别下降为第1次时的71.35%和81.15%,沸石分子筛的吸脱附性能更为稳定；蜂窝活性炭饱和吸附量大、脱附时间快，适用于宽负荷、低风量、中高浓度VOCs废气处理；沸石分子筛空气动力学及循环吸脱附性能较好，适用于处理初始温度相对较高、中低浓度VOCs废气。

ADSORPTION AND DESORPTION PERFORMANCE OF HONEYCOMB ACTIVATED CARBON AND ZEOLITE MOLECULAR SIEVE FOR VOCs EXHAUST GAS FROM COATING

Industrial coating volatile organic compounds (VOCs) exhaust gas was selected as the test object, and a fixed-bed pilot plant was designed to conduct VOCs adsorption and desorption tests with the honeycomb activated carbon and zeolite molecular sieve as adsorbents. The results showed that the iodine value, specific surface area, total pore volume and micropore volume of honeycomb activated carbon were larger than those of zeolite molecular sieve, which were 1.79, 2.93, 1.55 and 2.02 times those of zeolite molecular sieve, respectively; under the same desorption temperature and inlet air speed, VOCs were easier to desorb from the surface of honeycomb activated carbon, and the desorption time was much shorter than that of zeolite molecular sieve; under the same reaction conditions, the saturation adsorption capacity of honeycomb activated carbon for VOCs was significantly higher than that of zeolite molecular sieve. Under the same reaction conditions, the saturation adsorption amount of VOCs on honeycomb activated carbon was significantly higher than that on zeolite molecular sieve, but the saturation adsorption amount of zeolite molecular sieve was less affected by the reaction temperature and VOCs concentration; after 10 cycles of adsorption and desorption, the adsorption rate of VOCs on honeycomb activated carbon and zeolite molecular sieve decreased to 71.35% and 81.15% of that of the first time, respectively, and the adsorption and desorption performance of zeolite molecular sieve was more stable. The adsorption and desorption performance of zeolite molecular sieve was more stable. The saturation adsorption capacity of honeycomb activated carbon was large and the desorption time was fast, which was suitable for treating wide load, low air volume and medium to high concentration of VOCs waste gas; zeolite molecular sieve had better aerodynamic and cyclic adsorption and desorption performance, suitable for treating low to medium concentration of VOCs waste gas with a relatively higher initial temperature.