Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 40, Pages 36598-36606Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b08451
Keywords
NH3-SCR; OMS-2; super hydrophobic; H2O endurance; self-cleaning performance
Funding
- National Natural Science Foundation of China [51808529, 51908535, 21707145]
- Province Natural Science Foundation of GanSu [17JR5RA317, 18JR3RA383]
- Science and Technology Program of Lanzhou City [2018-RC-65]
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OMS-2 catalysts exhibit excellent selective catalytic reduction (SCR) activity at low temperature but weak H2O resistance restricts its industrial application. To remarkably improve the water resistance of Mn-based catalysts is a key technical problem. In this work, the H2O endurance and self-cleaning properties of OMS-2 catalysts are remarkably improved by the facile process, construction of hydrophobic coating. The performance of the hydrophobic layer on the bulk OMS-2 catalyst surface could be effectively controlled by adjusting the polydimethylsiloxane (PDMS) vapor deposition temperature. It is discovered that the 200 degrees C catalyst obtained super hydrophobic properties and formed with a contact angle of 160.3 degrees, which not only exhibited satisfactory NH3-SCR activity at low temperatures (140-300 degrees C) but also dramatically improved H2O endurance and self-cleaning performance. Moreover, the mechanism of improving H2O resistance and stability of the 200 degrees C catalyst was investigated in detail through a series of characterizations. Although the SCR activity of the 200 degrees C catalyst decreased slightly because of the combination of some active species (O-alpha and Mn3+) with PDMS, the H2O passivation of the active species was eliminated. The advantage of self-cleaning was confirmed by the analysis of surface species and simulation experiments, which could avoid the accumulation of intermediates on the surface and promote the stability of the OMS-2 catalyst for NH3-SCR at low temperature. This method of constructing special coating might be a huge step to remarkably improve the H2O endurance properties of the catalyst and provided a new concept for future industrial application.
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