The Study of C<sub>3</sub>H<sub>6</sub> Impact on Selective Catalytic Reduction by Ammonia (NH<sub>3</sub>-SCR) Performance over Cu-SAPO-34 Catalysts
In present work, the catalytic performance of Cu-SAPO-34 catalysts with or without propylene during the NH<sub>3</sub>-SCR process was conducted, and it was found that the de-NO<sub>x</sub> activity decreased during low temperature ranges (<350 °C), but obviously improved...
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| Main Authors: | , , , , |
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| Format: | article |
| Language: | EN |
| Published: |
MDPI AG
2021
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| Subjects: | |
| Online Access: | https://doaj.org/article/057fac89ca0742fe8b4467b0dc98ffd3 |
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| Summary: | In present work, the catalytic performance of Cu-SAPO-34 catalysts with or without propylene during the NH<sub>3</sub>-SCR process was conducted, and it was found that the de-NO<sub>x</sub> activity decreased during low temperature ranges (<350 °C), but obviously improved within the range of high temperatures (>350 °C) in the presence of propylene. The XRD, BET, TG, NH<sub>3</sub>-TPD, NO<sub>x</sub>-TPD, in situ DRIFTS and gas-switch experiments were performed to explore the propylene effect on the structure and performance of Cu-SAPO-34 catalysts. The bulk characterization and TG results revealed that neither coke deposition nor the variation of structure and physical properties of catalysts were observed after C<sub>3</sub>H<sub>6</sub> treatment. Generally speaking, at the low temperatures (<350 °C), active Cu<sup>2+</sup> species could be occupied by propylene, which inhibited the adsorption and oxidation of NO<sub>x</sub> species, confining the SCR reaction rate and causing the deactivation of Cu-SAPO-34 catalysts. However, with the increase of reaction temperatures, the occupied Cu<sup>2+</sup> sites would be recovered and sequentially participate into the NH<sub>3</sub>-SCR reaction. Additionally, C<sub>3</sub>H<sub>6</sub>-SCR reaction also showed the synergetic contribution to the improvement of NO<sub>x</sub> conversion at high temperature (>350 °C). |
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