期刊
JOURNAL OF CATALYSIS
卷 322, 期 -, 页码 84-90出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2014.11.010
关键词
Cu/SAPO-34; Hydrothermal stability; NH3-SCR; Si-O-Al bonds; Cu2+ protection
资金
- GM Global Research Development [RD-07-312-NV487]
The destructive effect of H2O on SAPO-34 framework and Cu2+ species protection mechanism at low temperature were studied in this research. A series of Cu/SAPO-34 samples with varying Cu loadings (0-6.78 wt%) were hydrothermally treated at 70 degrees C with 80% humidity. Textural characterization results showed that this treatment led to the collapse of SAPO-34 framework at zero or low Cu loadings, which was caused by the breakage of Si-O-Al bonds proved by ex-situ DRIFTS and NMR results. The copper content increase enhanced SAPO-34 stabilization. Selective catalytic reduction (SCR) reaction rates were severely reduced after the treatment, while this decrease was gradually suppressed with increasing Cu loading up to 6.78 wt%. NH3-TPD and EPR results revealed that both the number of Bronsted acid sites and Cu2+ species decreased after the treatment, which likely contributed to the reduced SCR reaction rates. Our study indicated that the isolated Cu2+ ions were both SCR active site and structure protective agent. (C) 2014 Elsevier Inc. All rights reserved.
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