Polyol-Mediated Synthesis of V<sub>2</sub>O<sub>5</sub>–WO<sub>3</sub>/TiO<sub>2</sub> Catalysts for Low-Temperature Selective Catalytic Reduction with Ammonia
We demonstrated highly efficient selective catalytic reduction catalysts by adopting the polyol process, and the prepared catalysts exhibited a high nitrogen oxide (NO<sub>X</sub>) removal efficiency of 96% at 250 °C. The V<sub>2</sub>O<sub>5</sub> and WO<sub&g...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-10-01
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| Series: | Nanomaterials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-4991/12/20/3644 |
| Summary: | We demonstrated highly efficient selective catalytic reduction catalysts by adopting the polyol process, and the prepared catalysts exhibited a high nitrogen oxide (NO<sub>X</sub>) removal efficiency of 96% at 250 °C. The V<sub>2</sub>O<sub>5</sub> and WO<sub>3</sub> catalyst nanoparticles prepared using the polyol process were smaller (~10 nm) than those prepared using the impregnation method (~20 nm), and the small catalyst size enabled an increase in surface area and catalytic acid sites. The NO<sub>X</sub> removal efficiencies at temperatures between 200 and 250 °C were enhanced by approximately 30% compared to those of the catalysts prepared using the conventional impregnation method. The NH<sub>3</sub>-temperature-programmed desorption and H<sub>2</sub>-temperature-programmed reduction results confirmed that the polyol process produced more surface acid sites at low temperatures and enhanced the redox ability. The in situ Fourier-transform infrared spectra further elucidated the fast absorption of NH<sub>3</sub> and its reduction with NO and O<sub>2</sub> on the prepared catalyst surfaces. This study provides an effective approach to synthesizing efficient low-temperature SCR catalysts and may contribute to further studies related to other catalytic systems. |
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| ISSN: | 2079-4991 |