Insights into novel mesoporous Cu-SAPO-34 with enhanced deNO(x) performance for diesel emission control
Insights into novel mesoporous Cu-SAPO-34 with enhanced deNO(x) performance for diesel emission control
复制标题
深入了解具有增强的脱硝性能的新型介孔 Cu-SAPO-34，用于柴油机排放控制
DOI：
10.1016/j.micromeso.2021.111245
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发表时间：
2021
影响因子：
5.2
通讯作者：
Peng Honggen
中科院分区：
文献类型：
--
作者：
Mi Yangyang;Li Gang;Zheng Yuling;Luo Yiwei;Liu Wenming;Li Zhenguo;Wu Daishe;Peng Honggen
NH3-SCR反应过程中硫酸铵的生成和传质极限的存在严重影响了小孔沸石的脱硝性能。本文采用一锅法双模板剂法合成了一种富含介孔的分级多孔Cu-SAPO-34-Meso分子筛。Cu-SAPO-34-Meso的脱硝性能优于无中孔的Cu-SAPO-34-Con，且在低温下脱硝温度窗口变宽，这主要是由于中孔的存在促进了反应物的传输，扩散计算证实了这一点。原位红外光谱分析表明，Cu-SAPO-34-Meso的抗SO2性能优于Cu-SAPO-34-Con，其抗SO2性能的提高可能是由于Cu-SAPO-34-Meso具有介孔结构，可以防止硫物种堵塞孔道，促进硫物种的快速分解。因此，新型Cu-SAPO-34-Meso催化剂有望成为真实的柴油机尾气净化催化剂。
The formation of ammonium sulfates and existence of mass transportation limits during selective catalytic reduction of NOxwith NH3(NH3-SCR) are severely affecting thedeNOxperformance of small pore zeolites. Herein, a novel hierarchical porous Cu-SAPO-34-Meso zeolite rich with mesopores was synthesized by one pot dual-template strategy. Cu-SAPO-34-Meso exhibited remarkabledeNOxperformance and broaden temperature window compared with Cu-SAPO-34-Con without mesopores, especially at low reaction temperature, which should be attributed to the mesopores in Cu-SAPO-34-Meso can accelerate the transportation of the reactants and this has been confirmed by the diffusion calculation. Even exposed on SO2feed gas, Cu-SAPO-34-Meso also displayed better SO2resistance compared with Cu-SAPO-34-Con. Thein situDRIFTS revealed that the enhanced SO2tolerance might be attributed to Cu-SAPO-34-Meso with mesopores could prevent the sulfur species blocking the pores and promote the decomposition of the sulfur species quickly. Therefore, the novel Cu-SAPO-34-Meso catalyst might be a good candidate for real diesel emission control application.