Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 198, Issue -, Pages 193-199Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2017.05.055
Keywords
NH3-SCR; Color variation; Acid sites; Valence state
Categories
Funding
- National Natural Science Foundation of China [21403210]
- Natural Science Foundation of Fujian Province, China [2016J05048]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB05050503, XDB05050501]
- Bureau of Science and Technology, Fujian Province, China [2015H0043]
- Xiamen Southern Oceanographic Center Project [14GQT60HJ30]
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For some commercial monolithic honeycomb V2O5-WO3/TiO2 SCR denitration catalysts, an unusual gray cylindrical region is observed through the axle center of each catalyst. There is plain local difference in color, mechanical strength and activity between samples from normal area and gray area in one catalyst. A series of microscopic characterizations including X-ray photoelectron spectroscopy and in situ diffuse reflectance infrared Fourier transform spectroscopy are conducted to find the factors affecting the local difference and the correlation between performance difference and microscopic physicochemical property of V2O5-WO3/TiO2 catalyst. The results show that the different V oxidation states and W chemical states between two samples result in the color variation. The catalyst sample from gray area possesses higher mechanical strength but lower activity, which results from the higher crystallinity, larger mesopore diameter, less chemisorbed oxygen, lower amount of active component and weaker acid sites. This work offers reference to further optimization of preparing and testing of SCR denitrification catalyst for manufacturers and testing institutes. (C) 2017 Elsevier B.V. All rights reserved.
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