以H_2再生SO_2吸附剂CuO/Al_2O_3及硫的回收

Regeneration of SO_2-adsorbed CuO/Al_2O_3 with H_2 and Recovery of Elemental Sulfur

吸附SO2饱和的CuO/Al2O3可在400℃下的尾气循环过程中用还原剂H2对其再生.在热重仪上进行程序升温还原再生实验,以考察尾气循环过程中吸附剂上Cu和S的相态变化.DTG曲线上分别于280和330℃处出现失重峰,表明吸附剂上的CuSO4在H2气氛中依次被还原为CuO和Cu.XPS表征结果则显示吸附剂上CuS由SO2和Cu反应生成.在400℃、进口气H2/SO2摩尔比为1.5时的硫磺制备过程中,以H2再生后的CuO/Al2O3作催化剂,可获得50%以上的硫磺产率,表明在吸附剂的H2再生过程中生成的CuS是硫磺制备过程的催化剂.

SO2-adsorbed CuO/Al2O3 can be regenerated with H2 through recycling the tail gas back into the reactor. The temperature-programmed regeneration experiments are carried out in a thermogravimetric analyzer to study Cu and S phase changes during tail gas recycling process. The existence of peaks in the DTG curve at 280 and 330 ℃, respectively, shows that CuSO4 formed during the SO2 removal transforms to CuO and then Cu, while the result of XPS characterization shows that CuS in the adsorbent is produced by the reaction of SO2 and Cu. An elemental sulfur yield of above 50% can be obtained in the sulfur recovery process at 400 ℃ with an H2/SO2 molar ratio of 1.5, which shows that CuS formed in the H2 regeneration of CuO/Al2O3 is the catalyst for elemental sulfur production.