研究报告
邹博霖,赵琦,石川,陈冰冰.硫毒化NH3-SCR脱硝催化剂再生方式的构建及机制研究[J].环境科学学报,2023,43(2):447-460
硫毒化NH3-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 NH3-SCR catalysts
- 基金项目: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)
- 邹博霖
- 大连理工大学化工学院精细化工国家重点实验室,大连 116024
- 赵琦
- 大连理工大学化工学院精细化工国家重点实验室,大连 116024;辽宁师范大学化学化工学院,大连 116029
- 石川
- 大连理工大学化工学院精细化工国家重点实验室,大连 116024
- 陈冰冰
- 大连理工大学化工学院精细化工国家重点实验室,大连 116024
- 摘要:以CeTi复合氧化物负载NH4HSO4(模拟SO2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NH4HSO4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NH3-SCR反应活性下降,但可通过纯O2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NH3-SCR脱硝催化剂的再生提供了可行性方案.
- Abstract:In this study, NH4HSO4 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 NH4HSO4 and the desorption of sulfur species by optimizing the atmosphere. Although the NH3-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 O2 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 NH3-SCR catalysts.