Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 10, Issue 2, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2021.107009
Keywords
C3H6-SCR; DBD plasma; Low temperature; Mn-catalysts
Categories
Funding
- National Natural Science Foundation of China [21902017]
- Project of Fundamental Research and Frontier Exploration of Chongqing [cstc2019jcyj-msxmX0052]
- Foundation of Technological Innovation and Application Development of Chongqing [cstc2019jscx-msxmX0226]
- Key Projects of Technology Innovation and Application Development of Chongqing [cstc2019jscx-gksbX0022]
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This study investigated the low temperature catalytic behavior of Mn/ZSM-5 catalysts in C3H6-SCR. The results showed that the 7Mn/ZSM-5-CPM-DBD catalyst exhibited high NO conversion under specific conditions. Furthermore, Mn/ZSM-5 catalysts activated by DBD plasma showed improved catalytic performance and surface characteristics.
For investigation of the low temperature catalytic behavior of C3H6-SCR, a series of Mn/ZSM-5 catalysts were synthesized by different activation and preparation methods for the first time. Under the simulated lean burn condition (5% O-2) of actual diesel engines, more than 96% NO conversion was observed at 120-270 degrees C with the space velocity of 30,000 h(-1) on the 7Mn/ZSM-5-CPM-DBD catalyst. The results showed that the excellent low temperature C3H6-SCR of 7Mn/ZSM-5-CPM-DBD catalyst was the shared effect between Bronsted acidity (hydroxyl) and oxygen vacancy on the surface, rather than the separate effect. Besides, the Mn/ZSM-5 catalysts with DBD plasma activation could generate higher dispersion of active species Mn, larger pore size, more abundant oxygen vacancies, and less destructive to zeolite than traditional calcination activation characterized by XRD, SEM, HR-TEM, EDS-mapping, ICP, BET, TG-DTA, XPS, and Py-FTIR. The study expects to shed more light on the nature of the surface active sites of Mn/ZSM-5 in low temperature C3H6-SCR, and the development of novel preparation method for the synthesis of highly active catalysts of low temperature C3H6-SCR.
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