Pd/In-based catalysts for nitrate catalytic removal from water: synthesis designs aiming for better N2 selectivity
Catalysts based on Pd/In were prepared through the wet impregnation method using Al2O3, SiO2, and TiO2 as supports. The impact of the synthesis procedure on N2 selectivity was studied. Characterization was performed using X-ray fluorescence and scanning electron microscopy–energy dispersive spectros...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IWA Publishing
2023-02-01
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| Series: | Water Supply |
| Subjects: | |
| Online Access: | http://ws.iwaponline.com/content/23/2/526 |
| Summary: | Catalysts based on Pd/In were prepared through the wet impregnation method using Al2O3, SiO2, and TiO2 as supports. The impact of the synthesis procedure on N2 selectivity was studied. Characterization was performed using X-ray fluorescence and scanning electron microscopy–energy dispersive spectroscopy analysis. The catalytic performance of these materials was evaluated for nitrate removal from water in a batch reactor. The order of better nitrate removal was found to be Al2O3>TiO2>SiO2. The selectivity towards N2 was also impacted by the support used, with Al2O3-based catalysts being the most selective and TiO2-based the least due to strong metal–support interaction. The synthesis stages also impacted nitrate removal efficiency and selectivity, with the highest N2 selectivity (94.4% at 90% nitrate conversion) found in catalysts where In was added after Pd and underwent intermediate calcination, reduction and final reduction stages.
HIGHLIGHTS
Pd,In-based catalysts were prepared on different supports by varying sequential synthesis steps aiming for higher N2 selectivity in nitrate reduction.;
Total nitrate conversion was obtained using Pd,In/Al2O3 and Pd,In/TiO2.;
The catalytic performance was influenced by the support used in the synthesis.;
Pd,In/Al2O3 was the most selective to N2.;
PACRIR synthesis was the most suitable for the catalytic removal of nitrate from water.; |
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| ISSN: | 1606-9749 1607-0798 |