A study on deactivation of V2O5-WO3-TiO2 SCR catalyst by alkali metals during entrained-flow combustion(PDF)

Release Time:2025-04-30  Hits:

• Date:2025-04-30
• Title of Paper:A study on deactivation of V2O5-WO3-TiO2 SCR catalyst by alkali metals during entrained-flow combustion(PDF)
• Journal:Journal of the Energy Institute
• Summary: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.
• Co-author:Lei Deng , Xuan Liu , Peiqing Cao , Yonggang Zhao , Yongbo Du
• Translation or Not:No
• Date of Publication:2016-06-25