A study on deactivation of V2O5-WO3-TiO2 SCR catalyst by alkali metals during entrained-flow combustion(PDF)
发布时间：2025-04-30
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- 发布时间：
- 2025-04-30
- 论文名称：
- A study on deactivation of V2O5-WO3-TiO2 SCR catalyst by alkali metals during entrained-flow combustion(PDF)
- 发表刊物：
- Journal of the Energy Institute
- 摘要：
- To study the deactivation mechanism of V 2 O 5 eWO 3 eTiO 2 SCR catalyst by alkali metals, an entrained-
flow combustion system is built, and the deactivation process is accelerated by exposing the catalyst
to aerosols which are generated from combustion of the Zhundong coal sample doped with potassium
and sodium salts. As the exposure time and load rate of alkali salt increase, the contamination of catalyst
becomes more serious and the activity of catalyst decreases. The poisoning effects of different alkali salts
on catalyst follow a sequence of Na 2 CO 3 < K 2 CO 3 < Na 2 SO 4 < K 2 SO 4 < NaCl < KCl. The combined
poisoning effect of chlorides of potassium and sodium lies between those of the individual effects.
Further investigations are performed on catalyst through NH 3 -chemisorption test and characterizations
of BET, SEM and EDX, XRF, FTIR and XPS. The results show that after exposing to aerosols, the surface of
catalyst is contaminated by particles of alkali salts with different morphologies. The decrease of the
specific surface area and the masking of V 2 O 5 can cause the mechanical deactivation of catalyst. The
chemical deactivation also occurs because the deposited particles of alkali salts can coordinate to the
hydroxyl groups on the surface and interact with the lattice oxygen in the vanadium species. The
chemical deactivation makes the dominant contribution to the activity reduction of the catalyst.
- 合写作者：
- Lei Deng , Xuan Liu , Peiqing Cao , Yonggang Zhao , Yongbo Du
- 是否译文：
- 否
- 发表时间：
- 2016-06-25