烧结烟气V2O5-WO3/TiO2催化剂失活及再生

Deactivation and regeneration of VO-WO/TiO catalysts in the sintering flue gas

通过实验室模拟烧结烟气脱硝、脱二噁英催化剂Na2SO4和K2SO4中毒(以氯苯作为二噁英的模拟物)现象,并利用水洗方式对中毒后的催化剂进行再生。通过BET、NH3-TPD和H2-TPR等方法对催化剂表面的理化性能进行分析。结果表明:负载Na2SO4和K2SO4会造成催化剂不同程度地失活;水洗再生可以恢复催化剂的脱硝活性至新鲜催化剂的96%以上,但对催化降解氯苯活性恢复有限。此外,水洗可以有效地去除催化剂表面的Na、K离子,恢复催化剂的比表面积、酸性位点数量以及表面物种还原性。

The sintering flue gas denitrification and dioxin removal catalyst Na2SO4 and K2SO4 poisoning are simulated in the lab by taking Chlorobenzene as a simulant of dioxins,and the regeneration on the poisoned catalysts is carried out by water.In addition,the physical and chemical properties of all catalysts are analyzed by methods such BET,NH3-TPD,H2-TPR,etc.The results show that loading Na2SO4 and K2SO4could cause different deactivation of the catalysts.Simultaneously,the regeneration by water could restore the denitration activity of the catalysts up to more than 96% of the fresh catalyst,while the recovery of catalytic degradation chlorobenzene activity is limited.Furthermore,the Na/K ions on the catalyst surface could be removed effectively by water,while and the specific surface area,the number of acidic sites,and the reducibility of surface species of the catalysts could be also restored.