The Different Impacts of SO2 and SO3 on Cu/Zeolite SCR Catalysts
The different impacts of SO2 and SO3 on Cu/zeolite SCR catalysts were investigated by SCR performance tests and multiple characterization techniques including temperature programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS) and X-ray absorption fine structure (XAFS). The results indicate that a larger amount of highly dispersed CuSO4 formed in the zeolite catalysts (Z-CuSO4) upon SO3 poisoning, explaining the much more significant deactivation of the Cu/zeolite catalysts that were exposed to SO3 compared to poisoning by SO2. This paper provides the first demonstration that active sites of Cu/zeolite SCR catalysts involved in the storage and removal of sulfur can react with SO2 and SO3 in very different ways. In particular, the significant differences in the extent of sulfur uptake account for the considerably different impacts of SO2 and SO3 poisoning on the performance of Cu/zeolite SCR catalysts.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 989426
- Report Number(s):
- PNNL-SA-74011; 33216; 35404; VT0401000
- Journal Information:
- Catalysis Today, 151(3-4):266-270, Journal Name: Catalysis Today, 151(3-4):266-270 Journal Issue: 3-4 Vol. 151; ISSN CATTEA; ISSN 0920-5861
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
CATALYSTS
COPPER
Cu/Zeolite
DEACTIVATION
Environmental Molecular Sciences Laboratory
NOx emission control
PERFORMANCE TESTING
POISONING
SELECTIVE CATALYTIC REDUCTION
SO2 and SO3 poisoning
SULFUR DIOXIDE
SULFUR TRIOXIDE
Urea SCR Catalysts
ZEOLITES
deactivation
durability