The promotional effect of H2 reduction treatment on the low-temperature NH3-SCR activity of Cu/SAPO-18 |
Zhu, N (Zhu, Na); Lian, ZH (Lian, Zhihua); Zhang, Y (Zhang, Yan); Shan, WP* (Shan, Wenpo); He, H (He, Hong) |
In this study, a Cu/SAPO-18 catalyst was treated by H2 reduction, which induced a remarkable enhancement of the low-temperature NH3-SCR activity. Compared with the fresh catalyst, the reduced Cu/SAPO-18 catalyst showed an increase in NOx conversion from 45% to 80% at 175 °C, and from 80% to 100% at 200 °C, under a GHSV of 200,000 h-1. The characterization (XRD, XPS and H2-TPR) and in-situ DRIFTS results confirmed that a large amount of Cu cations (most of which were Cu+ ions) existed on/in Cu/SAPO-18 after the H2 reduction treatment. The increased Cu+/Cu2+ ratio led to the enhanced low-temperature SCR activity.
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Key words:Cu/SAPO-18; H-2 reduction treatment; Low-temperature activity; Selective catalytic reduction; NOx abatement |
Volume:483 Page:536-544 Journal:APPLIED SURFACE SCIENCE |
https://doi.org/10.1016/j.apsusc.2019.03.336
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