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Controlled synthesis of Cu-based SAPO-18/34 intergrowth zeolites for selective catalytic reduction of NOx by ammonia
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2021-02-26 , DOI: 10.1016/j.jhazmat.2021.125543
Shoute Zhang , Shujun Ming , Lei Guo , Ce Bian , Ying Meng , Qian Liu , Yahao Dong , Jiajun Bi , Dan Li , Qin Wu , Kaiwei Qin , Zhen Chen , Lei Pang , Weiquan Cai , Tao Li

Cu-based SAPO-18, SAPO-18/34 intergrowth and SAPO-34 zeolites were applied for the selective catalytic reduction of NOx by ammonia (NH3-SCR) catalysts. Comprehensive characterization results revealed that the SAPO-18/34 with higher amount and strength of acid sites could facilitate the generation of more isolated copper ions (Cu2+ and Cu+) and suppress the formation of CuOx, which might account for the fact that intergrowth crystal structure of Cu-SAPO-18/34 exhibited higher fresh NH3-SCR activity, more robust hydrothermal durability and better SO2-resistance ability than that Cu-SAPO-18 and Cu-SAPO-34. In situ DRIFTS results provided the formation of reaction intermediates, such as -NH2, NH4+, NO3-, NO2-, etc. Eley-Rideal (E-R) and Langmuir-Hinshelwood (L-H) reaction mechanisms were both involved in Cu-based SAPO-18 and SAPO-18/34 intergrowth zeolites, but the L-H mechanism dominated the NH3-SCR reaction, in addition, Cu-SAPO-34 only followed “L-H” mechanism.



中文翻译:

用于选择性催化还原NO的铜基SAPO-三十四分之十八共生沸石的控制合成X被氨

的Cu-SAPO-18,SAPO-18/34和共生SAPO-34沸石被应用于选择性催化还原NO的X由氨(NH 3 -SCR)催化剂。综合表征结果表明,具有较高酸性位点数量和强度的SAPO-18 / 34可以促进更多离析的铜离子(Cu 2+和Cu +)的生成并抑制CuO x的形成,这可能是造成这一事实的原因。 Cu-SAPO-18 / 34的共生晶体结构表现出更高的新鲜NH 3 -SCR活性,更强的水热耐久性和更好的SO 2抗性比Cu-SAPO-18和Cu-SAPO-34高。原位DRIFTS结果提供反应中间体的形成,如-NH 2,NH 4 +,NO 3 -,NO 2 - ,等等ELEY-Rideal(ER)和Langmuir-欣谢尔伍德(LH)的反应机制均被卷入铜基SAPO-18和SAPO-18 / 34共生沸石,但LH机理主导了NH 3 -SCR反应,此外,Cu-SAPO-34仅遵循“ LH”机理。

更新日期:2021-03-04
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