The Role of Lewis and Bronsted Acid Sites in NO Reduction with NH3 on Sulfur Modified TiO2-Supported V2O5 Catalyst
Zhao, Wei; Dou, S; Zhong, Qin; Wu, L; Wang, Q; Wang, A
| HERO ID | 4744383 |
|---|---|
| In Press | No |
| Year | 2017 |
| Title | The Role of Lewis and Bronsted Acid Sites in NO Reduction with NH3 on Sulfur Modified TiO2-Supported V2O5 Catalyst |
| Authors | Zhao, Wei; Dou, S; Zhong, Qin; Wu, L; Wang, Q; Wang, A |
| Journal | Russian Journal of Physical Chemistry A, Focus on Chemistry |
| Volume | 91 |
| Issue | 13 |
| Page Numbers | 2489-2494 |
| Abstract | V2O5/S-doped TiO2 was prepared by the sol-gel and impregnation methods. The adsorption of NO, NH3, and O-2 over the catalyst was studied by in situ DRIFTS spectroscopy to elucidate the reaction mechanism of the low-temperature selective catalytic reduction of NO with NH3. Exposing the catalyst to O-2 and NO, three types of nitrates species appeared on the surface. The introduction of S to TiO2 could generate large amounts of acid sites for ammonia adsorption on the catalyst, which was believed to be an important role in the SCR reaction and hereby improved the catalytic activity. The results indicated two possible SCR reaction pathways for catalyst. One was that NO was absorbed to form nitrite species, which could react with NH3 on Lewis acid sites, producing N-2 and H2O. Another way was that NH3 was adsorbed, then reacted with gas phase NO (E-R) and nitrite intermediates on the surface (L-H). |
| Doi | 10.1134/S003602441713026X |
| Wosid | WOS:000425149900001 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Keyword | S-doping; NH3-SCR; reaction mechanism |