New CHA-Type aluminoborosilicates as efficient catalysts for MTO and NH3-SCR of NOx reactions

作者：Zhang, Jingyan; Ji, Peng; Ren, Li; Zhao, Yuhong; Li, Shiqing; Xu, Hao^*; Peng, Honggen; Jiang, Jin-Gang; Guan, Yejun; Wu, Peng^*

来源：Chemical Engineering Journal, 2022, 444: 136657.

DOI：10.1016/j.cej.2022.136657

• CHA zeolite
• cheap OSDA
• High-silica
• MTO reaction
• NH3-SCR of NOx

The small-pore CHA-type zeolites have received intensive attentions due to their outstanding performance in both of the methanol-to-olefin (MTO) process and ammonia selective catalytic reduction of nitrogen oxides (NH3- SCR of NOx) reactions. However, the costly synthesis of CHA-type aluminosilicate is a great issue for the practical application. In this study, a novel and cheap organic structure-directing agent of N,N,N-trimethylisobuty-lammonium hydroxide was developed and used to synthesize CHA-type zeolites (name as ECNU-25) with boric acid as the supporting agent. The Si/Al ratio in the synthetic gel could be tailored in a wide range of 50 - infinity. [Al, B]-ECNU-25 zeolite thus synthesized served as an effective catalyst for the MTO reaction. After Cu2+-exchange, the Cu-[Al,B]-ECNU-25 was also highly active in the NH3-SCR of NOx.

• 单位
  南昌大学; 广东工业大学