Effects of SiO2/Al2O3 ratio, reaction atmosphere and metal additive on de-NOx performance of HC-SCR over Cu-based ZSM-5
[Display omitted] •2Cu(2 wt.%)-ZSM-5 catalysts with various SiO2/Al2O3 ratio were prepared.•2Cu/ZSM-5 with 90 of SiO2/Al3O3 exhibited broad temperature window for NOx reduction.•CO and H2 induced a negative effect on de-NOx performance over 2Cu/ZSM-5.•2Cu1Sn/ZSM-5 improved low-temperature HC-SCR in...
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Published in | Journal of industrial and engineering chemistry (Seoul, Korea) Vol. 90; pp. 132 - 144 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
25.10.2020
한국공업화학회 |
Subjects | |
Online Access | Get full text |
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Summary: | [Display omitted]
•2Cu(2 wt.%)-ZSM-5 catalysts with various SiO2/Al2O3 ratio were prepared.•2Cu/ZSM-5 with 90 of SiO2/Al3O3 exhibited broad temperature window for NOx reduction.•CO and H2 induced a negative effect on de-NOx performance over 2Cu/ZSM-5.•2Cu1Sn/ZSM-5 improved low-temperature HC-SCR in H2-CO-C3H6-SCR process.
This study aims to investigate the catalytic performance of 2Cu/ZSM-5 with different SiO2/Al2O3 ratios (30, 75, and 90) for selective catalytic reduction (SCR) of NOx by C3H6. The coexistent CO and H2 in the C3H6-SCR process were also evaluated to further improve the de-NOx performance. The SiO2/Al2O3 ratios and coexistent CO and H2 significantly affected the de-NOx performance and its operating temperature window. The addition of 1 wt.% metal additives (Pt, Ce, Sn, and Mn) to 2Cu/ZSM-5 exhibited a distinct improvement in catalytic performance. Among the metal-additive catalysts, 2Cu1Sn/ZSM-5 demonstrated favorable NOx conversion in the H2- or CO-C3H6-SCR process owing to the enhancement of partial oxidation of C3H6 by H2. This resulted in improved low-temperature catalytic performance, without any accompanying side reactions that produce NH3, N2O, and HNCO. |
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ISSN: | 1226-086X 1876-794X |
DOI: | 10.1016/j.jiec.2020.07.005 |