硫毒化NH_(3)-SCR脱硝催化剂再生方式的构建及机制研究  

Establishment and mechanism study of regeneration method for S-poisoned NH_(3)-SCR catalysts

作　　者：邹博霖 赵琦 石川[1] 陈冰冰 ZOU Bolin;ZHAO Qi;SHI Chuan;CHEN Bingbing(State Key Laboratory of Fine Chemicals,School of Chemical Engineering,Dalian University of Technology,Dalian 116024;School of Chemistry and Chemical Engineering,Liaoning Normal University,Dalian 116029)

机构地区：[1]大连理工大学化工学院精细化工国家重点实验室,大连116024 [2]辽宁师范大学化学化工学院,大连116029

出　　处：《环境科学学报》2023年第2期447-460,共14页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.21872014,21932002);国家重点研发计划(No.2017YFA0700103);中央高校基本科研业务费(No.DUT20ZD205);辽宁省自然基金指导计划(No.2019-ZD-0023);辽宁省教育厅面上项目(No.LJKZ0982)。

摘　　要：以CeTi复合氧化物负载NH_(4)HSO_(4)(模拟SO_(2)毒化催化剂)为研究对象,并向其中掺杂Mo作为改性组分,研究了硫毒化催化剂的再生过程与机制.与热再生相比,冷等离子体在再生毒化后催化剂的过程中显现出独特的优势.通过对再生后催化剂的物理化学性质表征及优化再生气氛,确认了冷等离子再生催化剂的优点:不仅能够保持催化剂物相结构的稳定,还可促进催化剂表面NH_(4)HSO_(4)的低温分解和硫物种的脱附.虽然冷等离子体再生后的催化剂NH_(3)-SCR反应活性下降,但可通过纯O_(2)气氛中焙烧的方式,实现对催化剂物理化学性质的重构和催化活性的再生.通过此研究,初步建立了催化剂“毒化-再生-重构”的基本构效关系,为硫中毒NH_(3)-SCR脱硝催化剂的再生提供了可行性方案.In this study,NH_(4)HSO_(4)were loaded on CeTi composite oxide and Mo-doped formula to investigate the regeneration process and mechanism of these simulated S-poisoned catalyst.Compared with thermal regeneration,the cold plasma assisted regeneration process showed unique advantages.Through the characterizations of the regenerated catalysts,it was confirmed that the cold plasma treatment could maintain the structure of the catalysts,and meanwhile accelerate the decomposition of NH_(4)HSO_(4)and the desorption of sulfur species by optimizing the atmosphere.Although the NH_(3)-SCR activity of catalyst could not be recovered after the cold plasma regeneration process,the physicochemical property can be reconstructed by calcining the catalyst in pure O_(2)atmosphere,resulting in the recovery of the catalytic activity.In summary,the strategy of regenerating S-poisoned catalyst by the proposed"poisoning-regeneration-reconstruction"process was established,which provided an effective method for the regeneration of S-poisoned NH_(3)-SCR catalysts.

关 键 词：冷等离子体辅助再生 Mo改性CeO_(2)-TiO_(2)催化剂 硫中毒催化剂 NH_(3)-SCR 

分 类 号：X131[环境科学与工程—环境科学]