摘要
在TiO2上进行了气相H2S光催化氧化消除的研究.氧对H2S的光催化氧化消除过程是不可缺少的,对含量为560mg/m3的H2S,当加入的氧气与原料气中H2S的分子比为42∶1,空速为28000h-1时,去除率达到97%.在H2S光催化氧化消除过程中,单质硫的产生可使TiO2失活,经光照再生单质硫转化为SO42-后,TiO2活性恢复,而且SO42-的生成对催化剂的中毒有抑制作用.
The photocatalytic-oxidation of H_2S on TiO_2 was investigated.Oxygen is indispensable for the photodestruction of H_2S.When the mol ratio of oxygen to H_2S was 42∶1 in the raw gas,the degradation of H_2S reached 97% with 28000 h^(-1) volume space velocity.TiO_2 catalyst can be poisoned by S^0. After TiO_2 catalyst was regenerated by light in the presence of air,S^0 was converted to SO_4^(2-),the photocatalytic activity of TiO_2 was recovered.The presence of surface SO_4^(2-) can stabilize the photocatalytic activity of TiO_2.
出处
《感光科学与光化学》
CSCD
北大核心
2004年第3期211-217,共7页
Photographic Science and Photochemistry
