期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 323, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2021.111245
关键词
DeNO(x); Mesoporous Cu-SAPO-34; Mass transportation; Sulfur resistance
类别
资金
- National Key R&D Program of China [2016YFC0205900]
- National Natural Science Foundation of China [21976078, 21773106]
- Natural Science Foundation of Jiangxi Province [20202ACB213001]
- National Engineering Laboratory for Mobile Source Emission Control Technology [NELMS2019A12]
A novel hierarchical porous Cu-SAPO-34-Meso zeolite, synthesized by a one pot dual-template strategy, exhibited remarkable deNOx performance and SO2 resistance, making it a promising candidate for real diesel emission control applications.
The formation of ammonium sulfates and existence of mass transportation limits during selective catalytic reduction of NOx with NH3 (NH3-SCR) are severely affecting the deNO(x) performance 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 remarkable deNOx performance 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 SO2 feed gas, Cu-SAPO-34-Meso also displayed better SO2 resistance compared with Cu-SAPO-34-Con. The in situ DRIFTS revealed that the enhanced SO2 tolerance 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.
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